US20070163389A1 - Briquette for use as steelmaking material and method of manufacturing the same - Google Patents
Briquette for use as steelmaking material and method of manufacturing the same Download PDFInfo
- Publication number
- US20070163389A1 US20070163389A1 US10/589,963 US58996305A US2007163389A1 US 20070163389 A1 US20070163389 A1 US 20070163389A1 US 58996305 A US58996305 A US 58996305A US 2007163389 A1 US2007163389 A1 US 2007163389A1
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- US
- United States
- Prior art keywords
- briquette
- shot
- waste
- shot waste
- steelmaking material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000004484 Briquette Substances 0.000 title claims abstract description 106
- 239000000463 material Substances 0.000 title claims abstract description 60
- 238000009628 steelmaking Methods 0.000 title claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 239000002699 waste material Substances 0.000 claims abstract description 106
- 238000007711 solidification Methods 0.000 claims abstract description 57
- 230000008023 solidification Effects 0.000 claims abstract description 57
- 238000005520 cutting process Methods 0.000 claims abstract description 32
- 239000011324 bead Substances 0.000 claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 238000005054 agglomeration Methods 0.000 claims abstract description 25
- 230000002776 aggregation Effects 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 claims abstract description 15
- 238000007906 compression Methods 0.000 claims abstract description 15
- 239000010802 sludge Substances 0.000 claims abstract description 11
- 239000002173 cutting fluid Substances 0.000 claims abstract description 6
- 238000000748 compression moulding Methods 0.000 claims description 17
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000004115 Sodium Silicate Substances 0.000 claims description 12
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 239000010426 asphalt Substances 0.000 claims description 6
- 239000000839 emulsion Substances 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 35
- 238000000034 method Methods 0.000 description 20
- 229910052742 iron Inorganic materials 0.000 description 17
- 238000005422 blasting Methods 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 239000012466 permeate Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 235000011437 Amygdalus communis Nutrition 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241000220304 Prunus dulcis Species 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 235000020224 almond Nutrition 0.000 description 2
- 238000010420 art technique Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 235000013601 eggs Nutrition 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011369 resultant mixture Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a briquette for use as steelmaking material and a method of manufacturing the same. Particularly, the invention relates to a technique for effectively utilizing shot waste resulting from shot blasting a ferrous metal.
- the shot waste resulting from shot blasting the ferrous metal generally contains a ferrous powder metal and spent shot beads (steel beads) in a total amount on the order of 75 to 95 wt %. Therefore, the aforesaid shot waste can offer an effective resource as a steelmaking material.
- the shot waste is apt to ignite or to be scattered.
- the shot waste contains such a great number of shot beads that the shot waste is hard to be solidified by compression molding and the like. This leads to a disadvantage in the handling operations thereof such as transportation and storage. Accordingly, the reuse of the shot waste involves technical and cost disadvantages. In reality, therefore, the shot waste is committed to landfill disposal as industrial waste.
- Such a landfill disposal of the shot waste is not favorable from the standpoint of the effective utilization of resources.
- the landfill disposal not only entails the environmental deterioration but also requires a high disposal cost.
- the invention has been accomplished and has an object to provide a briquette for use as steelmaking material, which allows for an effective reuse of the shot waste, and to provide a method of manufacturing the same.
- a briquette for use as steelmaking material comprises a dry briquette which contains a ferrous metal and which is formed by solidifying shot waste with a solidification assistant, the shot waste containing a ferrous powder metal and a great number of shot beads.
- the briquette for use as steelmaking material having the above composition, is formed by solidifying the shot waste with the solidification assistant. Therefore, the briquette is capable of exhibiting an adequate degree of mechanical strength so as to be easy to handle during transportation, storage and the like. Because of the dry solid mass nature, the briquette directly charged into a blast furnace involves no fear of causing bumping or being scatteringly carried upward to be discharged from the furnace. What is more, the briquette contains the great number of shot beads formed from pure iron having an iron content of 90 wt % or more. This leads to a decreased use of a reducing agent in a steel making process. Thus, the briquette permits the shot waste to be reused as a high-quality steelmaking material, contributing to the environmental conservation as well as to the reduction of the disposal cost of the shot waste.
- the above shot beads may preferably be bonded to one another via the ferrous powder metal impregnated with the aforesaid solidification assistant.
- the shot beads which have been difficult to be bonded together by the prior-art technique, can be readily and rigidly bonded together.
- the above briquette for use as steelmaking material may preferably contain the above solidification assistant in an amount of 0.5 to 5 wt %.
- the compression molding can easily and assuredly solidify the shot waste, while ensuring the quality of the shot waste as the steelmaking material.
- the above briquette for use as steelmaking material may further contain ferrous-metal cutting residue particles and oil.
- the oil prevents the oxidization of the pure iron present in the briquette, so that the cutting residue particles and the shot waste can be reused as the high-quality steelmaking material.
- the briquette for use as steelmaking material containing the above oil may preferably contain the shot waste in an amount of 5 to 25 wt %.
- the briquette can achieve adequate degrees of bulk density and mechanical strength. If the content of the shot waste is less than 5 wt %, the briquette has such a small bulk density that the briquette, as charged into some type of blast furnace, may not fall down smoothly in the furnace. If the content of the shot waste exceeds 25 wt %, the following problem is encountered. In a case where the shot waste is unevenly distributed, the briquette is susceptible to fracture at its portion where the shot waste is concentrated.
- the shot waste may preferably comprise shot beads formed from steel.
- a content of oxidized iron is so small that the briquette can make an even more favorable steelmaking material.
- the shot waste in general contains the steel beads and a powder material.
- the steel beads contain pure iron in an amount of 90 wt % or more, whereas the powder material contains oxidized powder iron in an amount of 60 to 65 wt %. That is, with the increase in the content of the powder material, the briquette contains the greater amount of oxidized iron.
- the shot beads removed of the powder material are used as the shot waste, the briquette is reduced in the content of the oxidized iron. Accordingly, the use of the reducing agent can be reduced.
- the solidification assistant may preferably be at least one selected from the group consisting of sodium silicate, coloidal silica, aluminum phosphate and asphalt emulsion.
- the solidification assistant may preferably be at least one selected from the group consisting of sodium silicate, coloidal silica, aluminum phosphate and asphalt emulsion.
- a method of manufacturing a briquette for use as steelmaking material comprises the steps of: adding a solidification assistant to shot waste containing a ferrous powder metal and shot beads; compression molding the shot waste admixed with the solidification assistant; and drying the compression molded shot waste.
- the shot waste is compression molded whereby the solidification assistant admixed to the shot waste is allowed to permeate substantially the whole mass of the shot waste.
- the shot waste can be solidified to a desired strength by compression molding.
- the briquette for use as steelmaking material can be manufactured with ease and at low cost.
- the briquette manufacture method of the first aspect may further comprise a step of impregnating the solidification assistant into the shot waste, the step being interposed between the step of compression molding the shot waste and the step of drying the compression molded shot waste.
- the briquette further increased in the mechanical strength can be obtained.
- a method of manufacturing a briquette for use as steelmaking material comprises the steps of: forming cotton-like agglomerations by admixing shot waste to cutting sludge containing ferrous-metal cutting residue particles and a cutting fluid containing oil and water; compression molding the cotton-like agglomerations thereby forming a brittle compact of a predetermined shape, which has the fibrous cutting residue particles sheared and which is removed of excessive water and oil; impregnating a solidification assistant into the brittle compact; and drying the brittle compact impregnated with the solidification assistant.
- the compression molding of the cotton-like agglomerations roughly shears the fibrous cutting residue particles, which have been difficult to be sheared by the prior-art technique, so that the cutting residue particles along with the shot waste can be solidified easily.
- the solidification assistant impregnated into the brittle compact permits the brittle compact merely compression molded to be solidified to a desired strength.
- the manufacture process negates the need for finely crushing the cotton-like agglomerations in order to solidify the agglomerations.
- the briquette for use as steelmaking material can be manufactured with ease and at low cost.
- the briquette manufacture method of the second aspect it is preferred to admix the shot waste in an amount of 10 to 30 wt %. If the content of the shot waste in the cotton-like agglomerations is less than 10 wt %, a briquette having a great bulk density is difficult to obtain. If the content of the shot waste in the cotton-like agglomerations exceeds 30 wt %, the agglomerations are difficult to solidify. Furthermore, in a case where the shot waste is unevenly distributed, the briquette may be susceptible to fracture at its portion where the shot waste is concentrated.
- shot beads formed from steel may preferably be used as the shot waste.
- the briquette is decreased in the content of oxidized iron, thus providing an even more favorable steelmaking material.
- the solidification assistant may preferably be at least one selected from the group consisting of sodium silicate, coloidal silica, aluminum phosphate and asphalt emulsion.
- the shot waste can be more easily and rigidly solidified.
- the briquette manufacture method of the second aspect in particular, the brittle compact containing the oil can be solidified easily and rigidly.
- FIG. 1 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a first embodiment of the invention
- FIG. 2 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a second embodiment of the invention
- FIG. 3 is a partially cut-away perspective view showing a briquette
- FIG. 4 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a third embodiment of the invention.
- FIG. 1 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a first embodiment of the invention.
- shot waste S FIG. 1 ( a )
- a solidification assistant D in liquid form is added dropwise to the shot waste S ( FIG. 1 ( b )).
- the shot waste S includes a great number of spent shot beads B thinned down to less than a predetermined particle size by the shot blasting process, a ferrous powder metal C and the like.
- the powder metal contains oxidized powder iron in an amount of 60 to 65 wt %.
- a 100% sodium silicate solution is used as the solidification assistant D.
- the shot waste S admixed with the solidification assistant D is compression molded by means of a press using a mold 3 ( FIG. 1 ( c ), FIG. 1 ( d )).
- the compression molding allows the solidification assistant D added to the shot waste S to permeate substantially the whole mass of the shot waste S.
- the solidification assistant D is uniformly impregnated into the powder metal C and is also allowed to uniformly adhere to the surfaces of the shot beads B.
- the shot waste S impregnated with the solidification assistant D is allowed to cure (dry) for two days or so, for example, ( FIG. 1 ( e )).
- the solidification assistant D is solidified to complete the briquette A for use as steelmaking material ( FIG. 1 ( f )).
- the shot waste may also be quickly cooled by applying thereto air blow at normal temperatures or cooled air blow.
- the above manufacture process provides the dry, porous briquette A.
- the briquette A may preferably contain the shot waste in an amount of 95 to 99.5 wt %, and the solidification assistant D in an amount of 0.5 to 5.0 wt %.
- This composition ensures the quality of the briquette as the steelmaking material and permits the shot waste S to be easily and rigidly solidified. If the content of the solidification assistant D is less than 0.5 wt %, the resultant briquette has such a low mechanical strength as to be susceptible to fracture during transportation or other handling operations. If the content of the solidification assistant exceeds 5 wt %, the content of the ferrous metal is accordingly decreased and hence, the briquette is lowered in the quality as the steelmaking material.
- the briquette A manufactured by the above process is a porous mass formed by solidifying the shot waste S and hence, is readily and assuredly removed of water by curing. Therefore, when the briquette is directly charged into the blast furnace, there is no fear of causing bumping or of being scatteringly carried upward to be discharged from the furnace. Furthermore, since the briquette is formed by solidifying the shot waste S with the solidification assistant D, the briquette can exhibit an adequate degree of mechanical strength such as to facilitate the handling operations thereof such as transportation and storage. Particularly, the compression molding allows the solidification assistant D to permeate substantially the whole mass of the shot waste S and hence, the great number of shot beads B in the shot waste S can be bonded together by way of the powder metal C containing the solidification assistant D.
- the use of the reducing agent in the steelmaking process can be decreased because the briquette contains the great number of shot beads B containing the pure iron in an amount of 90 wt % or more. Accordingly, the shot waste S can be reused as a high-quality steelmaking material.
- FIG. 2 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a second embodiment of the invention.
- This embodiment differs from the embodiment shown in FIG. 1 in that the manufacture process further includes a step of impregnating the solidification assistant D into the shot waste S, the step being interposed between the step of compression molding the shot waste S and the step of drying the compression molded shot waste S.
- the impregnation of the solidification assistant D is performed as follows, for example. As carried on a belt conveyor 7 , the compression molded shot waste S is dipped in the solidification assistant D filled in a tank 8 ( FIG. 2 ( d )). Sodium silicate diluted with water is used as the solidification assistant D filled in the tank 8 . Thus is ensured a good permeability of the solidification assistant D into the compression molded shot waste S. According to this embodiment, the mechanical strength of the briquette A is further increased.
- the first embodiment may also use sodium silicate diluted with water as the solidification assistant D.
- the solidification assistant D can easily and effectively permeate the shot waste S during the compression molding.
- At least one selected from the group consisting of sodium silicate, coloidal silica and aluminum phosphate may be used as the solidification assistant D. These compounds are capable of easily and rigidly solidifying the shot waste S.
- the briquette A may also take a substantially pillow-like shape, such as of eggs, almond and rugby ball.
- the pillow-like shape has a rounded circumferential edge and is gradually increased in thickness from the circumferential edge toward its center ( FIG. 3 ). Molding the shot waste into such a shape provides the briquette A which is hard to collapse against a compressive load and is less susceptible to partial fracture at its corner and the like.
- FIG. 4 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a third embodiment of the invention.
- cotton-like agglomerations M are first prepared by sprinkling the shot waste S on cutting sludge E ( FIG. 4 ( a )) being transported on the belt conveyor 1 , the cutting sludge resulting from cutting a ferrous metal.
- the cotton-like agglomerations are admixed with the shot waste S ( FIG. 4 ( b )).
- the cutting sludge E is a cotton-like material containing the cutting residue particles and the cutting fluid.
- the shot waste S results from shot blasting a ferrous metal, containing spent shot beads thinned down to less than a predetermined particle size by the shot blasting process and a powder material containing oxidized powder iron in an amount of 60 to 65 wt %.
- a mixing ratio of the shot waste S is 10 to 30 wt %. If the cotton-like agglomerations M contains the shot waste S in an amount of less than 10 wt %, the briquette A having a great bulk density is difficult to obtain. If the content of the shot waste S in the cotton-like agglomerations M exceeds 30 wt %, the subsequent step may have difficulty in solidifying the agglomerations. Furthermore, in a case where the shot waste S is unevenly distributed, the briquette A is susceptible to fracture at a portion where the shot waste S is concentrated.
- the cotton-like agglomerations M are compressed under pressure for preliminary adjustment of the contents of water and oil in the cutting sludge E, the water and oil constituting the cutting fluid.
- the pressurization/compression of the cotton-like agglomerations M may be accomplished, for example, by clamping the agglomerations between a pair of rollers 2 disposed in the vicinity of a transportation end of the belt conveyor 1 ( FIG. 4 ( b )). It is preferred in this process that the adjustment of the cotton-like agglomerations M is made so as to limit the water content up to 50 wt % and to limit the oil content up to 10 wt %.
- the cotton-like agglomerations M are made easy to handle during the transportation, storage and the like.
- the cotton-like agglomerations M having the contents of water and oil so adjusted are compression molded by means of the press using the mold 3 so as to form a brittle compact F ( FIG. 4 ( c )).
- the compression molding roughly shears the cutting residue particles having a spiral-fiber shape and contained in the cutting sludge E.
- the compression molding also removes excessive water and oil from the brittle compact F, so that the water content thereof is adjusted to 2 to 12 wt % whereas the oil content thereof is adjusted to 1 to 5 wt %. This permits the minimum amount of residual oil to effectively prevent the oxidization of the cutting residue particles.
- the previous step preliminarily adjusts the cutting sludge E to limit the water content up to 50 wt % and the oil content up to 10 wt %, the content percentages of water and oil in the brittle compact F can be easily and properly adjusted only by compression molding.
- the brittle compact F is formed in a shape easy to handle, such as circular cylinder, sphere and prism, and is compacted to such a strength as not to collapse when sent to the subsequent step.
- the brittle compact F is impregnated with the solidification assistant D in liquid form.
- the impregnation of the solidification assistant D is accomplished, for example, by dipping the brittle compact F in the solidification assistant D filled in the tank 8 as carrying the brittle compact F on the belt conveyor 7 ( FIG. 4 ( d )).
- the solidification assistant D may preferably be at least one selected from the group consisting of sodium silicate, coloidal silica and aluminum phosphate. This embodiment principally uses sodium silicate.
- the solidification assistant D may preferably be impregnated in an amount of 2 to 30 wt %.
- An organic binder such as vinyl acetate may also be used as the solidification assistant D.
- the brittle compact F impregnated with the solidification assistant D ( FIG. 4 ( e )) is cured (dried) for removal of the water contained therein ( FIG. 4 ( f )).
- the briquette A for use as steelmaking material ( FIG. 4 ( g )).
- the curing may preferably be performed for two days or so because the briquette is assuredly removed of the water contained therein.
- the briquette may also be quickly cooled by applying thereto air blow at normal temperatures or cooled air blow.
- the above manufacture process provides the dry briquette A containing the shot waste S, ferrous-metal cutting residue particles E, iron and oil.
- the resultant briquette A contains the shot waste S in an amount of 5 to 25 wt %.
- the briquette A is a porous mass formed by solidifying the brittle compact F and hence, is readily and assuredly removed of water by curing. Therefore, when the briquette is directly charged into the blast furnace, there is no fear of causing bumping or of being scatteringly carried upward to be discharged from the furnace.
- the briquette A contains the shot waste S in the amount of 5 to 25 wt %, the briquette has adequate bulk density and mechanical strength.
- the briquette A for use as steelmaking material is required to fall smoothly into the blast furnace without being scatteringly carried upward when charged into the furnace.
- some type of blast furnace may require the briquette to have a bulk density of 0.2 or more.
- the briquette may fail to satisfy this requirement.
- the content of the shot waste in the briquette exceeds 25 wt %, the briquette may have the following problem. That is, in the case of the uneven distribution of the shot waste, the briquette may be susceptible to fracture at its portion where the shot waste is concentrated.
- the above process of manufacturing the briquette A effectively prevents the oxidization of the pure iron because the process materials retain some of the oil of the cutting fluid at all times. It is confirmed, for example, that a briquette A manufactured using a cutting sludge E containing cutting residue from a bearing steel (SUJ-2) contains 60 to 90 wt % of pure iron. Therefore, the briquette has a high smelting yield of 80% or more such as to be worthy of a high-quality steelmaking material which can be offered to steel makers for pay. What is more, the briquette is in the solid form, thereby facilitating the transportation and other handling operation thereof.
- the above manufacture process can solidified the cotton-like agglomerations M without involving a step of crushing the cotton-like agglomerations M into fine particles. This leads to an efficient manufacture of the briquette A.
- the above method of manufacturing the briquette A may be particularly preferably applied to the reuse of the cutting residue particles having a carbon content of 0.2 wt % or more. While such cutting residue particles have such a great springback as to be hard to solidify, the manufacture method of the invention may be applied thereby easily forming the rigidly solidified briquette A as eliminating the influence of the springback.
- the cutting residue particles having a carbon content of 0.2 wt % or more is typically exemplified by cutting residue from a bearing steel.
- the foregoing embodiments use the shot waste S which includes the spent shot beads and the powder material containing oxidized powder iron.
- a mass consisting of only the shot beads left by screening out the powder material may also be used as the shot waste.
- the briquette A is decreased in the content of oxidized iron, so that the use of the reducing agent in the steelmaking process can be reduced accordingly.
- the briquette can be even more preferably used as the steelmaking material.
- the briquette A may have not only the aforementioned circular cylindrical shape, but also the pillow-like shape, such as of eggs, almond and rugby ball.
- the pillow-like shape has a rounded circumferential edge and is gradually increased in thickness from the circumferential edge toward its center ( FIG. 3 ).
- the above briquette A may also be manufactured by admixing fine dusts (recovery dusts) with the shot waste S, followed by solidifying the resultant mixture with the solidification assistant D.
- the fine dusts are a byproduct of the steelmaking process by means of an electric furnace or open-hearth furnace, or of a smelting operation of a metal such as copper, zinc, oxidized tin and brass.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A briquette for use as steelmaking material and a method of manufacturing the same, capable of effective reusing of the shot waste. After dropping a solidification assistant into shot waste consisting of powder metal containing iron powder and shot beads, the shot waste is compression molded. The compression molded shot waste is dried. Alternatively, the shot waste is admixed with cutting sludge containing ferrous-metal cutting residue particles and a cutting fluid containing oil and water, thereby forming cotton-like agglomerations. The cotton-like agglomerations are compression molded, thereby forming a brittle compact, which has the fibrous cutting sludge roughly sheared and which is removed of excessive water and oil. The brittle compact is impregnated with the solidification assistant, solidified and dried.
Description
- The present invention relates to a briquette for use as steelmaking material and a method of manufacturing the same. Particularly, the invention relates to a technique for effectively utilizing shot waste resulting from shot blasting a ferrous metal.
- The shot waste resulting from shot blasting the ferrous metal generally contains a ferrous powder metal and spent shot beads (steel beads) in a total amount on the order of 75 to 95 wt %. Therefore, the aforesaid shot waste can offer an effective resource as a steelmaking material. Unfortunately, however, the shot waste is apt to ignite or to be scattered. Furthermore, the shot waste contains such a great number of shot beads that the shot waste is hard to be solidified by compression molding and the like. This leads to a disadvantage in the handling operations thereof such as transportation and storage. Accordingly, the reuse of the shot waste involves technical and cost disadvantages. In reality, therefore, the shot waste is committed to landfill disposal as industrial waste.
- Such a landfill disposal of the shot waste is not favorable from the standpoint of the effective utilization of resources. In addition, the landfill disposal not only entails the environmental deterioration but also requires a high disposal cost.
- In view of the foregoing, the invention has been accomplished and has an object to provide a briquette for use as steelmaking material, which allows for an effective reuse of the shot waste, and to provide a method of manufacturing the same.
- According to the invention for achieving the above object, a briquette for use as steelmaking material comprises a dry briquette which contains a ferrous metal and which is formed by solidifying shot waste with a solidification assistant, the shot waste containing a ferrous powder metal and a great number of shot beads.
- The briquette for use as steelmaking material, having the above composition, is formed by solidifying the shot waste with the solidification assistant. Therefore, the briquette is capable of exhibiting an adequate degree of mechanical strength so as to be easy to handle during transportation, storage and the like. Because of the dry solid mass nature, the briquette directly charged into a blast furnace involves no fear of causing bumping or being scatteringly carried upward to be discharged from the furnace. What is more, the briquette contains the great number of shot beads formed from pure iron having an iron content of 90 wt % or more. This leads to a decreased use of a reducing agent in a steel making process. Thus, the briquette permits the shot waste to be reused as a high-quality steelmaking material, contributing to the environmental conservation as well as to the reduction of the disposal cost of the shot waste.
- The above shot beads may preferably be bonded to one another via the ferrous powder metal impregnated with the aforesaid solidification assistant. Thus, the shot beads, which have been difficult to be bonded together by the prior-art technique, can be readily and rigidly bonded together.
- The above briquette for use as steelmaking material may preferably contain the above solidification assistant in an amount of 0.5 to 5 wt %. Thus, the compression molding can easily and assuredly solidify the shot waste, while ensuring the quality of the shot waste as the steelmaking material.
- The above briquette for use as steelmaking material may further contain ferrous-metal cutting residue particles and oil. In this case, the oil prevents the oxidization of the pure iron present in the briquette, so that the cutting residue particles and the shot waste can be reused as the high-quality steelmaking material.
- The briquette for use as steelmaking material containing the above oil may preferably contain the shot waste in an amount of 5 to 25 wt %. Thus, the briquette can achieve adequate degrees of bulk density and mechanical strength. If the content of the shot waste is less than 5 wt %, the briquette has such a small bulk density that the briquette, as charged into some type of blast furnace, may not fall down smoothly in the furnace. If the content of the shot waste exceeds 25 wt %, the following problem is encountered. In a case where the shot waste is unevenly distributed, the briquette is susceptible to fracture at its portion where the shot waste is concentrated.
- In the briquette for use as steelmaking material containing the oil, the shot waste may preferably comprise shot beads formed from steel. In this case, a content of oxidized iron is so small that the briquette can make an even more favorable steelmaking material. Specifically, the shot waste in general contains the steel beads and a powder material. The steel beads contain pure iron in an amount of 90 wt % or more, whereas the powder material contains oxidized powder iron in an amount of 60 to 65 wt %. That is, with the increase in the content of the powder material, the briquette contains the greater amount of oxidized iron. This dictates the need to increase the use of the reducing agent in the steelmaking process, leading to a disadvantage in terms of cost. However, if the shot beads removed of the powder material are used as the shot waste, the briquette is reduced in the content of the oxidized iron. Accordingly, the use of the reducing agent can be reduced.
- The solidification assistant may preferably be at least one selected from the group consisting of sodium silicate, coloidal silica, aluminum phosphate and asphalt emulsion. Thus, the shot waste, the cutting residue particles and the like can be readily and rigidly solidified.
- A method of manufacturing a briquette for use as steelmaking material according to a first aspect of the invention comprises the steps of: adding a solidification assistant to shot waste containing a ferrous powder metal and shot beads; compression molding the shot waste admixed with the solidification assistant; and drying the compression molded shot waste.
- According to the manufacture method of briquette for use as steelmaking material according to the first aspect, the shot waste is compression molded whereby the solidification assistant admixed to the shot waste is allowed to permeate substantially the whole mass of the shot waste. Despite the great number of shot beads contained therein, the shot waste can be solidified to a desired strength by compression molding. Thus, the briquette for use as steelmaking material can be manufactured with ease and at low cost.
- The briquette manufacture method of the first aspect may further comprise a step of impregnating the solidification assistant into the shot waste, the step being interposed between the step of compression molding the shot waste and the step of drying the compression molded shot waste. In this case, the briquette further increased in the mechanical strength can be obtained.
- A method of manufacturing a briquette for use as steelmaking material according to a second aspect of the invention comprises the steps of: forming cotton-like agglomerations by admixing shot waste to cutting sludge containing ferrous-metal cutting residue particles and a cutting fluid containing oil and water; compression molding the cotton-like agglomerations thereby forming a brittle compact of a predetermined shape, which has the fibrous cutting residue particles sheared and which is removed of excessive water and oil; impregnating a solidification assistant into the brittle compact; and drying the brittle compact impregnated with the solidification assistant.
- According to the manufacture method of briquette for use as steelmaking material according to the second aspect, the compression molding of the cotton-like agglomerations roughly shears the fibrous cutting residue particles, which have been difficult to be sheared by the prior-art technique, so that the cutting residue particles along with the shot waste can be solidified easily. Furthermore, the solidification assistant impregnated into the brittle compact permits the brittle compact merely compression molded to be solidified to a desired strength. Hence, the manufacture process negates the need for finely crushing the cotton-like agglomerations in order to solidify the agglomerations. Thus, the briquette for use as steelmaking material can be manufactured with ease and at low cost.
- In the briquette manufacture method of the second aspect, it is preferred to admix the shot waste in an amount of 10 to 30 wt %. If the content of the shot waste in the cotton-like agglomerations is less than 10 wt %, a briquette having a great bulk density is difficult to obtain. If the content of the shot waste in the cotton-like agglomerations exceeds 30 wt %, the agglomerations are difficult to solidify. Furthermore, in a case where the shot waste is unevenly distributed, the briquette may be susceptible to fracture at its portion where the shot waste is concentrated.
- In the briquette manufacture method of the second aspect, shot beads formed from steel may preferably be used as the shot waste. In this case, the briquette is decreased in the content of oxidized iron, thus providing an even more favorable steelmaking material.
- In the briquette manufacture methods of the first and second aspects, the solidification assistant may preferably be at least one selected from the group consisting of sodium silicate, coloidal silica, aluminum phosphate and asphalt emulsion. Thus, the shot waste can be more easily and rigidly solidified. According to the briquette manufacture method of the second aspect, in particular, the brittle compact containing the oil can be solidified easily and rigidly.
-
FIG. 1 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a first embodiment of the invention; -
FIG. 2 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a second embodiment of the invention; -
FIG. 3 is a partially cut-away perspective view showing a briquette; and -
FIG. 4 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a third embodiment of the invention. - The preferred embodiments of the invention will hereinbelow be described in details with reference to the accompanying drawings.
-
FIG. 1 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a first embodiment of the invention. In the manufacture of a briquette A, shot waste S (FIG. 1 (a)) resulting from shot blasting a ferrous metal is first transported by means of abelt conveyor 1, while a solidification assistant D in liquid form is added dropwise to the shot waste S (FIG. 1 (b)). - The shot waste S includes a great number of spent shot beads B thinned down to less than a predetermined particle size by the shot blasting process, a ferrous powder metal C and the like. The powder metal contains oxidized powder iron in an amount of 60 to 65 wt %. A 100% sodium silicate solution is used as the solidification assistant D.
- Next, the shot waste S admixed with the solidification assistant D is compression molded by means of a press using a mold 3 (
FIG. 1 (c),FIG. 1 (d)). The compression molding allows the solidification assistant D added to the shot waste S to permeate substantially the whole mass of the shot waste S. Thus, the solidification assistant D is uniformly impregnated into the powder metal C and is also allowed to uniformly adhere to the surfaces of the shot beads B. - Subsequently, the shot waste S impregnated with the solidification assistant D is allowed to cure (dry) for two days or so, for example, (
FIG. 1 (e)). Thus, the solidification assistant D is solidified to complete the briquette A for use as steelmaking material (FIG. 1 (f)). For curing, the shot waste may also be quickly cooled by applying thereto air blow at normal temperatures or cooled air blow. - The above manufacture process provides the dry, porous briquette A. The briquette A may preferably contain the shot waste in an amount of 95 to 99.5 wt %, and the solidification assistant D in an amount of 0.5 to 5.0 wt %. This composition ensures the quality of the briquette as the steelmaking material and permits the shot waste S to be easily and rigidly solidified. If the content of the solidification assistant D is less than 0.5 wt %, the resultant briquette has such a low mechanical strength as to be susceptible to fracture during transportation or other handling operations. If the content of the solidification assistant exceeds 5 wt %, the content of the ferrous metal is accordingly decreased and hence, the briquette is lowered in the quality as the steelmaking material.
- The briquette A manufactured by the above process is a porous mass formed by solidifying the shot waste S and hence, is readily and assuredly removed of water by curing. Therefore, when the briquette is directly charged into the blast furnace, there is no fear of causing bumping or of being scatteringly carried upward to be discharged from the furnace. Furthermore, since the briquette is formed by solidifying the shot waste S with the solidification assistant D, the briquette can exhibit an adequate degree of mechanical strength such as to facilitate the handling operations thereof such as transportation and storage. Particularly, the compression molding allows the solidification assistant D to permeate substantially the whole mass of the shot waste S and hence, the great number of shot beads B in the shot waste S can be bonded together by way of the powder metal C containing the solidification assistant D. This results in the rigid solidification of the shot waste S. What is more, the use of the reducing agent in the steelmaking process can be decreased because the briquette contains the great number of shot beads B containing the pure iron in an amount of 90 wt % or more. Accordingly, the shot waste S can be reused as a high-quality steelmaking material.
-
FIG. 2 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a second embodiment of the invention. This embodiment differs from the embodiment shown inFIG. 1 in that the manufacture process further includes a step of impregnating the solidification assistant D into the shot waste S, the step being interposed between the step of compression molding the shot waste S and the step of drying the compression molded shot waste S. - The impregnation of the solidification assistant D is performed as follows, for example. As carried on a belt conveyor 7, the compression molded shot waste S is dipped in the solidification assistant D filled in a tank 8 (
FIG. 2 (d)). Sodium silicate diluted with water is used as the solidification assistant D filled in thetank 8. Thus is ensured a good permeability of the solidification assistant D into the compression molded shot waste S. According to this embodiment, the mechanical strength of the briquette A is further increased. - The first embodiment may also use sodium silicate diluted with water as the solidification assistant D. In this case, the solidification assistant D can easily and effectively permeate the shot waste S during the compression molding.
- In either embodiment, at least one selected from the group consisting of sodium silicate, coloidal silica and aluminum phosphate may be used as the solidification assistant D. These compounds are capable of easily and rigidly solidifying the shot waste S.
- Besides the circular cylinder shape shown in
FIG. 1 , the briquette A may also take a substantially pillow-like shape, such as of eggs, almond and rugby ball. The pillow-like shape has a rounded circumferential edge and is gradually increased in thickness from the circumferential edge toward its center (FIG. 3 ). Molding the shot waste into such a shape provides the briquette A which is hard to collapse against a compressive load and is less susceptible to partial fracture at its corner and the like. -
FIG. 4 is a step chart illustrating a method of manufacturing a briquette for use as steelmaking material according to a third embodiment of the invention. In the manufacture of the briquette A, cotton-like agglomerations M are first prepared by sprinkling the shot waste S on cutting sludge E (FIG. 4 (a)) being transported on thebelt conveyor 1, the cutting sludge resulting from cutting a ferrous metal. The cotton-like agglomerations are admixed with the shot waste S (FIG. 4 (b)). The cutting sludge E is a cotton-like material containing the cutting residue particles and the cutting fluid. The shot waste S results from shot blasting a ferrous metal, containing spent shot beads thinned down to less than a predetermined particle size by the shot blasting process and a powder material containing oxidized powder iron in an amount of 60 to 65 wt %. A mixing ratio of the shot waste S is 10 to 30 wt %. If the cotton-like agglomerations M contains the shot waste S in an amount of less than 10 wt %, the briquette A having a great bulk density is difficult to obtain. If the content of the shot waste S in the cotton-like agglomerations M exceeds 30 wt %, the subsequent step may have difficulty in solidifying the agglomerations. Furthermore, in a case where the shot waste S is unevenly distributed, the briquette A is susceptible to fracture at a portion where the shot waste S is concentrated. - Next, the cotton-like agglomerations M are compressed under pressure for preliminary adjustment of the contents of water and oil in the cutting sludge E, the water and oil constituting the cutting fluid. The pressurization/compression of the cotton-like agglomerations M may be accomplished, for example, by clamping the agglomerations between a pair of rollers 2 disposed in the vicinity of a transportation end of the belt conveyor 1 (
FIG. 4 (b)). It is preferred in this process that the adjustment of the cotton-like agglomerations M is made so as to limit the water content up to 50 wt % and to limit the oil content up to 10 wt %. Thus, the cotton-like agglomerations M are made easy to handle during the transportation, storage and the like. - The cotton-like agglomerations M having the contents of water and oil so adjusted are compression molded by means of the press using the mold 3 so as to form a brittle compact F (
FIG. 4 (c)). The compression molding roughly shears the cutting residue particles having a spiral-fiber shape and contained in the cutting sludge E. The compression molding also removes excessive water and oil from the brittle compact F, so that the water content thereof is adjusted to 2 to 12 wt % whereas the oil content thereof is adjusted to 1 to 5 wt %. This permits the minimum amount of residual oil to effectively prevent the oxidization of the cutting residue particles. Since the previous step preliminarily adjusts the cutting sludge E to limit the water content up to 50 wt % and the oil content up to 10 wt %, the content percentages of water and oil in the brittle compact F can be easily and properly adjusted only by compression molding. - The brittle compact F is formed in a shape easy to handle, such as circular cylinder, sphere and prism, and is compacted to such a strength as not to collapse when sent to the subsequent step.
- Subsequently, the brittle compact F is impregnated with the solidification assistant D in liquid form. The impregnation of the solidification assistant D is accomplished, for example, by dipping the brittle compact F in the solidification assistant D filled in the
tank 8 as carrying the brittle compact F on the belt conveyor 7 (FIG. 4 (d)). The solidification assistant D may preferably be at least one selected from the group consisting of sodium silicate, coloidal silica and aluminum phosphate. This embodiment principally uses sodium silicate. The solidification assistant D may preferably be impregnated in an amount of 2 to 30 wt %. Thus, the brittle compact F can be easily and rigidly solidified. An organic binder such as vinyl acetate may also be used as the solidification assistant D. - Next, the brittle compact F impregnated with the solidification assistant D (
FIG. 4 (e)) is cured (dried) for removal of the water contained therein (FIG. 4 (f)). Thus is obtained the briquette A for use as steelmaking material (FIG. 4 (g)). The curing may preferably be performed for two days or so because the briquette is assuredly removed of the water contained therein. For curing, the briquette may also be quickly cooled by applying thereto air blow at normal temperatures or cooled air blow. - The above manufacture process provides the dry briquette A containing the shot waste S, ferrous-metal cutting residue particles E, iron and oil. The resultant briquette A contains the shot waste S in an amount of 5 to 25 wt %.
- The briquette A is a porous mass formed by solidifying the brittle compact F and hence, is readily and assuredly removed of water by curing. Therefore, when the briquette is directly charged into the blast furnace, there is no fear of causing bumping or of being scatteringly carried upward to be discharged from the furnace.
- Since the briquette A contains the shot waste S in the amount of 5 to 25 wt %, the briquette has adequate bulk density and mechanical strength. The briquette A for use as steelmaking material is required to fall smoothly into the blast furnace without being scatteringly carried upward when charged into the furnace. Hence, some type of blast furnace may require the briquette to have a bulk density of 0.2 or more. If the briquette contains the shot waste in an amount of less than 5 wt %, the briquette may fail to satisfy this requirement. If the content of the shot waste in the briquette exceeds 25 wt %, the briquette may have the following problem. That is, in the case of the uneven distribution of the shot waste, the briquette may be susceptible to fracture at its portion where the shot waste is concentrated.
- Furthermore, the above process of manufacturing the briquette A effectively prevents the oxidization of the pure iron because the process materials retain some of the oil of the cutting fluid at all times. It is confirmed, for example, that a briquette A manufactured using a cutting sludge E containing cutting residue from a bearing steel (SUJ-2) contains 60 to 90 wt % of pure iron. Therefore, the briquette has a high smelting yield of 80% or more such as to be worthy of a high-quality steelmaking material which can be offered to steel makers for pay. What is more, the briquette is in the solid form, thereby facilitating the transportation and other handling operation thereof.
- In addition, the above manufacture process can solidified the cotton-like agglomerations M without involving a step of crushing the cotton-like agglomerations M into fine particles. This leads to an efficient manufacture of the briquette A.
- The above method of manufacturing the briquette A may be particularly preferably applied to the reuse of the cutting residue particles having a carbon content of 0.2 wt % or more. While such cutting residue particles have such a great springback as to be hard to solidify, the manufacture method of the invention may be applied thereby easily forming the rigidly solidified briquette A as eliminating the influence of the springback. The cutting residue particles having a carbon content of 0.2 wt % or more is typically exemplified by cutting residue from a bearing steel.
- The foregoing embodiments use the shot waste S which includes the spent shot beads and the powder material containing oxidized powder iron. Alternatively, a mass consisting of only the shot beads left by screening out the powder material may also be used as the shot waste. In this case, the briquette A is decreased in the content of oxidized iron, so that the use of the reducing agent in the steelmaking process can be reduced accordingly. Thus, the briquette can be even more preferably used as the steelmaking material.
- In the above third embodiment, as well, the briquette A may have not only the aforementioned circular cylindrical shape, but also the pillow-like shape, such as of eggs, almond and rugby ball. The pillow-like shape has a rounded circumferential edge and is gradually increased in thickness from the circumferential edge toward its center (
FIG. 3 ). - The above briquette A may also be manufactured by admixing fine dusts (recovery dusts) with the shot waste S, followed by solidifying the resultant mixture with the solidification assistant D. The fine dusts are a byproduct of the steelmaking process by means of an electric furnace or open-hearth furnace, or of a smelting operation of a metal such as copper, zinc, oxidized tin and brass.
Claims (15)
1. A briquette for use as steelmaking material comprising a dry briquette which contains a ferrous metal and which is formed by solidifying shot waste with a solidification assistant, the shot waste containing a ferrous powder metal and a great number of shot beads.
2. The briquette for use as steelmaking material according to claim 1 , wherein the shot beads are bonded to one another via the ferrous powder metal impregnated with the solidification assistant.
3. The briquette for use as steelmaking material according to claim 1 , containing the solidification assistant in an amount of 0.5 to 5 wt %.
4. The briquette for use as steelmaking material according to claim 1 , further containing ferrous-metal cutting residue particles and oil.
5. The briquette for use as steelmaking material according to claim 4 , containing the shot waste in an amount of 5 to 25 wt %.
6. The briquette for use as steelmaking material according to claim 4 , wherein the shot waste comprises shot beads formed from steel.
7. The briquette for use as steelmaking material according to claim 1 , wherein the solidification assistant is at least one selected from the group consisting of sodium silicate, coloidal silica, aluminum phosphate and asphalt emulsion.
8. A method of manufacturing a briquette for use as steelmaking material comprising the steps of:
adding a solidification assistant to shot waste containing a ferrous powder metal and shot beads; compression molding the shot waste admixed with the solidification assistant; and
drying the compression molded shot waste.
9. The method of manufacturing a briquette for use as steelmaking material according to claim 8 , further comprising a step of impregnating the solidification assistant into the shot waste, the step being interposed between the step of compression molding the shot waste and the step of drying the compression molded shot waste.
10. A method of manufacturing a briquette for use as steelmaking material comprising the steps of:
forming cotton-like agglomerations by admixing shot waste to cutting sludge containing ferrous-metal cutting residue particles and a cutting fluid containing oil and water;
compression molding the cotton-like agglomerations thereby forming a brittle compact of a predetermined shape, which has the fibrous cutting residue particles sheared and which is removed of excessive water and oil;
impregnating a solidification assistant into the brittle compact; and
drying the brittle compact impregnated with the solidification assistant.
11. The method of manufacturing a briquette for use as steelmaking material according to claim 10 , wherein the shot waste is admixed in an amount of 10 to 30 wt %.
12. The method of manufacturing a briquette for use as steelmaking material according to claim 10 , wherein the shot waste comprises shot beads formed from steel.
13. The method of manufacturing a briquette for use as steelmaking material according to claim 8 or 10 , wherein at least one selected from the group consisting of sodium silicate, coloidal silica, aluminum phosphate and asphalt emulsion is used as the solidification assistant.
14. The briquette for use as steelmaking material according to claim 4 , wherein the solidification assistant is at least one selected from the group consisting of sodium silicate, coloidal silica, aluminum phosphate and asphalt emulsion.
15. The method of manufacturing a briquette for use as steelmaking material according to claim 10 , wherein at least one selected from the group consisting of sodium silicate, coloidal silica, aluminum phosphate and asphalt emulsion is used as the solidification assistant.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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JP2004-050197 | 2004-02-25 | ||
JP2004050197A JP2005240087A (en) | 2004-02-25 | 2004-02-25 | Briquette for raw material for steelmaking and method for manufacturing the same |
JP2004-067428 | 2004-03-10 | ||
JP2004067428A JP2005256051A (en) | 2004-03-10 | 2004-03-10 | Briquette for steelmaking raw material and its producing method |
PCT/JP2005/003113 WO2005080614A1 (en) | 2004-02-25 | 2005-02-25 | Briquette as steelmaking raw material and process for producing the same |
Publications (1)
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US20070163389A1 true US20070163389A1 (en) | 2007-07-19 |
Family
ID=34889381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/589,963 Abandoned US20070163389A1 (en) | 2004-02-25 | 2005-02-25 | Briquette for use as steelmaking material and method of manufacturing the same |
Country Status (3)
Country | Link |
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US (1) | US20070163389A1 (en) |
EP (1) | EP1726666A4 (en) |
WO (1) | WO2005080614A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113366128A (en) * | 2018-12-12 | 2021-09-07 | 耶稣大拇指 | A method of briquetting coal from pellet fines, DRI sludge, DRI fines and residual fines from DRI dust treatment system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CZ17399U1 (en) * | 2007-02-14 | 2007-03-19 | Bxb Group S. R. O. | Sand mixture for manufacture of shaped products based on fine-grain granulate of aluminium or alloys thereof |
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US4369062A (en) * | 1981-09-28 | 1983-01-18 | Strange Robert R | Method of making briquettes and product |
US4585475A (en) * | 1980-06-25 | 1986-04-29 | Inland Steel Company | Method for recycling oily mill scale |
US20020152843A1 (en) * | 2000-08-10 | 2002-10-24 | Masataka Ishihara | Briquette as material for steel making and method for production thereof |
US20030075014A1 (en) * | 2000-10-02 | 2003-04-24 | Masataka Ishihara | Brittle formed product and iron-based power material and method for manufacturing these materials |
US20070144308A1 (en) * | 2004-03-12 | 2007-06-28 | Jtekt Corporation | Briquette for use as metal stock and method for manufacturing the same |
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JPH01108321A (en) | 1987-10-22 | 1989-04-25 | Daido Steel Co Ltd | Production of recycled starting material for melting from metal shavings containing oil |
JP2001089818A (en) | 1999-09-22 | 2001-04-03 | Musashi Seimitsu Ind Co Ltd | Method for treating pulverized waste metal |
JP2002241854A (en) | 2001-02-20 | 2002-08-28 | Honda Motor Co Ltd | Method for manufacturing briquette by utilizing grinding-wheel swarf |
RU2197544C2 (en) * | 2001-04-11 | 2003-01-27 | Общество с ограниченной ответственностью "Машгео ТНТЦ" | Briquette for metallurgy and method of manufacture of such briquette |
JP3709375B2 (en) | 2002-01-31 | 2005-10-26 | 光洋精工株式会社 | Briquette manufacturing method |
-
2005
- 2005-02-25 EP EP05719514A patent/EP1726666A4/en not_active Withdrawn
- 2005-02-25 WO PCT/JP2005/003113 patent/WO2005080614A1/en active Application Filing
- 2005-02-25 US US10/589,963 patent/US20070163389A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4585475A (en) * | 1980-06-25 | 1986-04-29 | Inland Steel Company | Method for recycling oily mill scale |
US4369062A (en) * | 1981-09-28 | 1983-01-18 | Strange Robert R | Method of making briquettes and product |
US20020152843A1 (en) * | 2000-08-10 | 2002-10-24 | Masataka Ishihara | Briquette as material for steel making and method for production thereof |
US20030075014A1 (en) * | 2000-10-02 | 2003-04-24 | Masataka Ishihara | Brittle formed product and iron-based power material and method for manufacturing these materials |
US20070144308A1 (en) * | 2004-03-12 | 2007-06-28 | Jtekt Corporation | Briquette for use as metal stock and method for manufacturing the same |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113366128A (en) * | 2018-12-12 | 2021-09-07 | 耶稣大拇指 | A method of briquetting coal from pellet fines, DRI sludge, DRI fines and residual fines from DRI dust treatment system |
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WO2005080614A1 (en) | 2005-09-01 |
EP1726666A1 (en) | 2006-11-29 |
EP1726666A4 (en) | 2008-04-23 |
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