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WO2003033748A1 - Systeme de filtration destine au recyclage et a la purification de magnesium - Google Patents

Systeme de filtration destine au recyclage et a la purification de magnesium Download PDF

Info

Publication number
WO2003033748A1
WO2003033748A1 PCT/SG2002/000238 SG0200238W WO03033748A1 WO 2003033748 A1 WO2003033748 A1 WO 2003033748A1 SG 0200238 W SG0200238 W SG 0200238W WO 03033748 A1 WO03033748 A1 WO 03033748A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
magnesium
magnesium melt
filter
melt
Prior art date
Application number
PCT/SG2002/000238
Other languages
English (en)
Inventor
Banghong Hu
Kin-Kong Tong
Chee-Mun Choy
Su-Xia Zhang
Original Assignee
Singapore Institute Of Manufacturing Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Singapore Institute Of Manufacturing Technology filed Critical Singapore Institute Of Manufacturing Technology
Priority to US10/493,006 priority Critical patent/US20050029718A1/en
Publication of WO2003033748A1 publication Critical patent/WO2003033748A1/fr

Links

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
    • C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
    • C22B26/20—Obtaining alkaline earth metals or magnesium
    • C22B26/22—Obtaining magnesium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/30—Accessories for supplying molten metal, e.g. in rations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • B22D43/004—Retaining slag during pouring molten metal by using filtering means
    • 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
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/006—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with use of an inert protective material including the use of an inert gas
    • 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
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/02—Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action including acoustic waves
    • C22B9/023—By filtering
    • 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 generally to a filtration system for purifying magnesium. Specifically, the present invention relates to a filtration system for recycling and purification of scrap magnesium and magnesium ingots with impurities.
  • Magnesium alloys are heated to a molten state in preparation for hot- working thereof.
  • Molten magnesium alloys easily oxidise and react with impurities, especially when scrap magnesium alloys are reused.
  • magnesium alloys are contaminated by non-metallic and metallic inclusions, for example oxides or intermetallic compounds, when melted.
  • the magnesium alloys are typically melted for producing castings.
  • the presence of inclusions within the magnesium alloys results in metallurgical defects therein and will adversely affect the quality of the castings produced from the magnesium alloys.
  • a known method for removing the impurities is to send the magnesium alloys to a smelter for smelting.
  • smelting is a costly process.
  • Another known process uses impediment plates disposed within a furnace for removing top and bottom sludge from magnesium melts.
  • the impediment plates do not remove inclusions suspended in the magnesium melts.
  • a filtration system for magnesium recycling and purification comprising: a first chamber for containing magnesium melt, the magnesium melt containing impurities; and a second chamber for receiving purified magnesium melt, wherein said first and second chambers have disposed therebetween a filter, the filter being a silicon-free medium.
  • a filtration method for magnesium recycling and purification comprising the steps of: receiving magnesium melt into a first chamber, the magnesium melt containing impurities within the first chamber containing impurities; providing a second chamber, the second chamber being in fluid communication with the first chamber; and substantially removing the impurities from the magnesium melt flowing from the first chamber into the second chamber using a filter, the filter being disposed between the first chamber and the second chamber and the filter including a silicon- free medium.
  • a filtration method for magnesium recycling and purification comprising the steps of: receiving magnesium into a first chamber, the magnesium within the first chamber containing impurities and the magnesium being one of a magnesium melt or solid magnesium ingot; providing a second chamber, the second chamber being in fluid communication with the first chamber; heating the magnesium contained in the first chamber by a heating apparatus for melting the magnesium and for maintaining the magnesium melt in a molten state, and the magnesium melt in the first chamber thereby flowing into the second chamber; and substantially removing the impurities from the magnesium melt flowing from the first chamber into the second chamber using a filter, the filter being disposed between the first chamber and the second chamber and the filter including a silicon- free medium.
  • FIG. 1 shows a partial front sectional view of a filtration system according to an embodiment of the invention
  • FIG. 2 shows a partial side sectional view of the filtration system of FIG. 1;
  • FIG. 3 is an illustration of a filter of the filtration system of FIG. 1 ;
  • FIG. 4 is an illustration of a first chamber and the filter of FIG. 3;
  • FIG. 5a shows a low magnification light optical microscope (LOM) micrograph of a tensile specimen made from magnesium melt obtained from the filtration system of FIG. 1;
  • LOM low magnification light optical microscope
  • FIG. 5b shows the LOM micrograph of FIG. 5a under high magnification
  • FIG. 6a shows a low magnification light optical microscope (LOM) micrograph of a mobile phone case specimen made from magnesium melt obtained from the filtration system of FIG. 1;
  • LOM low magnification light optical microscope
  • FIG. 6b shows the LOM micrograph of FIG. 6b under high magnification
  • FIG. 7a shows a graph plotting the tensile strength (ultimate tensile strength and yield strength) of test samples as a function of cross-head speed with the test samples being cast from a magnesium melt purified using the filtration system of FIG. 1 ; and FIG. 7b shows a graph plotting the percentage elongation of the test samples of FIG. 7b, as a function of cross-head speed.
  • FIG. 1 shows a partial front sectional view of the filtration system 20
  • FIG. 2 shows a partial side sectional view of the filtration system 20.
  • the filtration system 20 is for use in substantially purifying magnesium.
  • the filtration system 20 includes a crucible 22 being divided into two parts by a filter adapter 24 disposed therein, the two parts of the crucible being namely a first chamber 26 and a second chamber 28.
  • the first chamber 26 is in fluid communication with the second chamber 28 through an opening 30, as shown in FIG. 2, in the filter adapter 24 that forms a passageway therebetween.
  • the filter adapter 24 is for receiving a filter 32 therewithin and for removably engaging thereto.
  • FIG. 3 is an illustration of the filter 32
  • FIG. 4 is an illustration of the first chamber 26 and the filter 32.
  • the filter adapter 24 is preferably a steel structure that shaped and dimensioned for holding the filter 32 at the periphery thereof.
  • the filtration system 20 further includes a heating apparatus coupled to the crucible 22.
  • the heating apparatus is preferably integrated with the crucible 22 for providing heat to the crucible 22 and its contents.
  • the heating apparatus is electrically connected to a controller (all not shown).
  • the filtration system 20 is for providing substantially purified magnesium melts to downstream systems or machineries, for example, a die-casting machine.
  • magnesium ingots or scraps are provided to the first chamber 26 of the filtration system 20.
  • the controller activates the heating apparatus to provide heat to the crucible 22 and the magnesium therein, thereby melting the magnesium.
  • magnesium melt can be provided to the first chamber 26 of the crucible 22.
  • the heating apparatus provides heat to the crucible 22 to maintain the magnesium melt in its molten state and to melt the magnesium scraps and ingots added to the magnesium melt thereafter.
  • the filter 32 of the filtration system 20 is preferably made of a silicon-free material.
  • Conventional filters for example a filter for aluminium alloys, are made of silicon- based materials. The silicon-based materials readily react with magnesium to cause contamination therein and are therefore undesirable.
  • the filter 32 is made of one of steels or ceramic material which comprises of one or more material selected from a group consisting of Al 2 O 3 , MgO, AlPO 4 and Mg (PO 4 ) 2 .
  • the filter 32 comprises of an array of apertures (not shown). Each of the apertures is shaped and dimensioned for preventing the passage of a particle having a size greater than 5 microns therethrough. Preferably, each pair of adjacent apertures are spaced apart a distance of 5 to 250 microns.
  • the magnesium melt 38 in the first chamber 26 passes through the filter 32 and into the second chamber 28 of the crucible 22. Therefore, the impurities suspended in the magnesium melt 38 contained in the first chamber 26 is substantially removed by the filter 32 before entering the second chamber 28 as purified magnesium melt 40.
  • the magnesium melt 38 contained in the first chamber 26 contains bottom sludge that has settled at the bottom of the first chamber 26.
  • top sludge can also be found floating at the surface of the magnesium melt 38 contained in the first chamber 26.
  • the filter adapter 24 functions to substantially impede the top sludge and bottom sludge in the first chamber 26 from entering the second chamber 28 (all not shown).
  • the magnesium melt 38 in the first chamber 26 is drawn into the second chamber 28 by hydrostatic forces acting on the magnesium melt 38.
  • the magnesium melt 38 in the first chamber 26 continues to be drawn into the second chamber until the hydrostatic pressures of magnesium melt 38 in the first chamber 26 and the purified magnesium melt 40 in the second chamber 28 are in equilibrium.
  • each of the first chamber 26 and the second chamber 28 has a thermocouple 42 disposed therewithin. Both the thermocouples 42 are electrically connected to the controller for transducing temperature of the magnesium melt 38 in the first chamber 26 into first temperature signals (not shown) and the temperature of the purified magnesium melt 40 in the second chamber 40 into second temperature signals (not shown).
  • the first and second temperature signals are transmitted to the controller.
  • the controller uses a control function (not shown) to determine and control the heat output of the heating apparatus, thereby maintaining the magnesium melt 38 and the purified magnesium melt 40 in a molten state and to prevent overheating thereof. In the molten state, the viscosities of both the magnesium melt 38 and the purified magnesium melt 40 are greatly reduced, thereby facilitating flow thereof through the filter 32.
  • the crucible 22 is preferably enclosed for receiving and retaining protective gas therein.
  • a gas feed system (not shown) is connected to the crucible for supplying the protective gas thereinto.
  • the protective gas prevents both the magnesium melt 38 and the purified magnesium melt 40 from reacting with the atmosphere by forming a screen therebetween.
  • An extractor 44 extends from within the second chamber 28 to a die-casting assembly 46.
  • the extractor 44 is for extracting the purified magnesium melt 40 from the second chamber 28 and providing the purified magnesium melt 40 to the die-casting assembly 46.
  • the extractor 44 shown in FIG. 1 uses a piston and a goose-neck chamber assembly for extracting the purified magnesium melt 40.
  • Extracting the purified magnesium melt 40 from the second chamber 28 reduces the level of the purified magnesium melt 40 contained therein.
  • the reduction of the level of the purified magnesium melt 40 in the second chamber 28 further draws the magnesium melt 38 from the first chamber 26 and into the second chamber 28.
  • Magnesium melt and magnesium ingots or scraps can be further provided to the first chamber 26 for replenishing the second chamber 28 and thereby the filtration system
  • the purified magnesium melt 40 supplied from the filtration system 20 to the die- casting assembly 46 provides the die-casting assembly with a substantially inclusion- free purified magnesium melt 40 supply for use in a die-casting process.
  • the alloy used in the tests was AZ91 HP having a composition of Al 8-9.5%, Zn 0.3-1.0%, Mn>0.17%, Si ⁇ 0.05%, Fe ⁇ 0.004%, Cu ⁇ 0.015%, Ni ⁇ O.01%, others ⁇ 0.01%, others ⁇ 0.01%, Mg (remaining).
  • AZ91 HP having a composition of Al 8-9.5%, Zn 0.3-1.0%, Mn>0.17%, Si ⁇ 0.05%, Fe ⁇ 0.004%, Cu ⁇ 0.015%, Ni ⁇ O.01%, others ⁇ 0.01%, others ⁇ 0.01%, Mg (remaining).
  • AZ91 HP having a composition of Al 8-9.5%, Zn 0.3-1.0%, Mn>0.17%, Si ⁇ 0.05%, Fe ⁇ 0.004%, Cu ⁇ 0.015%, Ni ⁇ O.01%, others ⁇ 0.01%, others ⁇ 0.01%, Mg (remaining).
  • the tests were conducted using 100% fresh ingot and ingot including 10% scraps material.
  • microstructure analysis was conducted with light optical microscopy (LOM) while mechanical properties were determined using an Instron tensile testing machine.
  • LOM light optical microscopy
  • the cross-head speed was varied from 0.1 to 20 mm/min during tensile tests.
  • Typical microstructures for the tensile test specimen having a diameter of 10 mm- thick walled part and a mobile phone case, having a wall thickness of 0.6mm-thin wall part.
  • the microstructures consist mainly of a-Mg, intermetallic-Al 2 Mg ⁇ 7 , eutectic composition and some fine precipitate.
  • the thin walled parts showed much finer structure, as shown in FIGS. 7a and 7b, when compared to the thick walled parts shown in FIGS. 6a and 6b.
  • the reduced a -Mg grain size is due to rapid solidification rate occurred in the thin walled part.
  • FIGS. 8a and 8b show the tensile strength, comprising the ultimate tensile strength (UTS) and yield strength (YS) and elongation as a function of the cross-head speed.
  • UTS ultimate tensile strength
  • YS yield strength

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

On chauffe des alliages de magnésium jusqu'à un état fondu en préparation à un travail à chaud de ces alliages, par exemple, à une coulée sous pression. La présence d'inclusions dans ces alliages de magnésium entraîne des défauts métallurgiques à l'intérieur de ces alliages et nuisent à la qualité des moulages produits à partir de ces alliages de magnésium. Un mode de réalisation de l'invention traite le magnésium fondu contenant des impuretés à travers un filtre non réactif dans un environnement rempli de gaz de protection de façon à sensiblement purifier ce magnésium fondu et à réduire la présence d'inclusions dans les moulages formés à partir de ce magnésium.
PCT/SG2002/000238 2001-10-19 2002-10-18 Systeme de filtration destine au recyclage et a la purification de magnesium WO2003033748A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/493,006 US20050029718A1 (en) 2001-10-19 2002-10-18 Filtration system for magnesium recycling and purification

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG200106275A SG121696A1 (en) 2001-10-19 2001-10-19 Filtration system for recycling and purification of a magnesium melt
SGSG200106275-1 2001-10-19

Publications (1)

Publication Number Publication Date
WO2003033748A1 true WO2003033748A1 (fr) 2003-04-24

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SG (1) SG121696A1 (fr)
WO (1) WO2003033748A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7666248B2 (en) * 2004-02-24 2010-02-23 Alcan International Limited Method of priming filter for molten metal
CN108311652A (zh) * 2018-02-06 2018-07-24 洛阳晟雅镁合金科技有限公司 一种me20m镁合金扁锭的制备工艺

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101039725B1 (ko) 2009-03-23 2011-06-09 (주)이노캐스트 마그네슘 합금 스크랩의 재활용 처리장치 및 처리방법
WO2016131174A1 (fr) * 2015-02-16 2016-08-25 谭何易 Chaîne de production servant à produire des lingots d'alliage de magnésium normalisés à partir de déchets d'alliage de magnésium
CN108193061B (zh) * 2017-12-21 2019-09-20 河南省龙峰新材料有限公司 一种用于稀土料液的提纯装置
CN108237206A (zh) * 2018-02-28 2018-07-03 厦门格欧博新材料科技有限公司 一种盐芯成型设备
CN110724833B (zh) * 2019-11-27 2021-09-17 国科镁业科技(河南)有限公司 单质硅滤材在气相镁纯化中的应用及包含其的生产系统
CN113444888B (zh) * 2021-06-29 2022-06-24 重庆大学 一种采用定向凝固纯化镁熔体的方法

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US4124506A (en) * 1977-09-22 1978-11-07 Swiss Aluminium Ltd. Method for the filtration of molten metal in a crucible type furnace
US4640497A (en) * 1985-10-25 1987-02-03 Swiss Aluminium Ltd. Filtration apparatus
JPH0426725A (ja) * 1990-05-18 1992-01-29 Ngk Insulators Ltd 金属溶湯用濾材
WO1995012000A1 (fr) * 1993-10-27 1995-05-04 Aluminium Pechiney Poche de filtration de metal liquide sur medium filtrant, a chauffage ameliore

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Publication number Priority date Publication date Assignee Title
US7666248B2 (en) * 2004-02-24 2010-02-23 Alcan International Limited Method of priming filter for molten metal
CN108311652A (zh) * 2018-02-06 2018-07-24 洛阳晟雅镁合金科技有限公司 一种me20m镁合金扁锭的制备工艺
CN108311652B (zh) * 2018-02-06 2019-12-17 洛阳晟雅镁合金科技有限公司 一种me20m镁合金扁锭的制备工艺

Also Published As

Publication number Publication date
SG121696A1 (en) 2006-05-26
US20050029718A1 (en) 2005-02-10

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