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WO1992010439A1 - Procede de production de beton et de mortiers - Google Patents

Procede de production de beton et de mortiers Download PDF

Info

Publication number
WO1992010439A1
WO1992010439A1 PCT/CA1991/000440 CA9100440W WO9210439A1 WO 1992010439 A1 WO1992010439 A1 WO 1992010439A1 CA 9100440 W CA9100440 W CA 9100440W WO 9210439 A1 WO9210439 A1 WO 9210439A1
Authority
WO
WIPO (PCT)
Prior art keywords
neutralized
water
sludge
volume
hydration
Prior art date
Application number
PCT/CA1991/000440
Other languages
English (en)
Inventor
Daniel A. Mackie
Richard A. Kuntze
Original Assignee
Mackie Daniel A
Kuntze Richard A
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 Mackie Daniel A, Kuntze Richard A filed Critical Mackie Daniel A
Publication of WO1992010439A1 publication Critical patent/WO1992010439A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0418—Wet materials, e.g. slurries
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/008—Sludge treatment by fixation or solidification
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0481—Other specific industrial waste materials not provided for elsewhere in C04B18/00
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
    • C04B22/002—Water
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • This invention relates to a process for producing cementitious mixes such as concretes and mortar and, more particularly, relates to a process for producing concretes and mortars using sludges containing heavy metals from acidic waste neutralization.
  • Dewatering of the sludges is a very costly process, involving large settling ponds, thickeners, filters and dryers.
  • the product formed consists of very fine, dusty gypsums, which if placed into the environment, create dust problems.
  • the gypsums often contain toxic metals as metal hydroxides, which if allowed to leach into the environment, can cause metal levels in the water table that are harmful to plant, animal, and human health.
  • Gypsum is added in rock form to cement clinkers during grinding in the commercial manufacture of Portland cements for concrete and mortar as a retarder of the initial setting of the concrete or mortar. Excessive quantities of gypsum added to cement, however, have been found to weaken the resulting concrete or mortar. Fixation of toxic chemicals in concrete is generally known as a means to prevent or limit leaching of toxic chemicals from natural rainfall and ground waters. The use of the toxic chemicals themselves, such as in heavy metal hydroxides found in neutralization sludges, in place of and substitute for Portland cement, slags, or other pozzolanic materials in conjunction with the gypsums in the sludges, has not been practiced.
  • This invention relates to the use of neutralization sludges by mixing the sludges with Portland cement, flyash, slags or other pozzolanic materials and with aggregates to form mortars and concrete.
  • aqueous sludges from neutralization of acid wastes when used in place of a portion of the cement and when used as a substitute for a portion of water of hydration for mixing concrete or mortars in quantities that would be considered excessive in terms of gypsum addition to produce a strong concrete or mortar, produce a concrete and mortar that is equal to or superior in strength to concrete and mortars made with ordinary cement and water.
  • heavy metals present in the sludge are chemically and/or physically combined with the concrete or mortar to render the heavy metals chemically inert and to essentially prevent or at least reduce the rate at which the heavy metals can enter the environment.
  • the invention relates to a process for rendering heavy toxic metals in neutralized sludges substantially inert in a mortar or concrete mass comprising substituting said aqueous neutralized sludge containing heavy toxic metal for a cement or pozzolanic material in an effective amount up to 80% by volume of said cement or pozzolanic material, in a mortar or concrete mix, mixing with an effective amount of water of hydration, and allowing the resulting mixture to cure to a solid mortar or concrete mass.
  • the invention in another aspect, relates to a process in which said water of hydration is replaced by an effective amount of up to 100% by volume of aqueous neutralized sludge, preferably about 50% by volume of acgueous neutralized sludge.
  • the invention contemplates and includes the use of acid neutralization sludges with any pozzolanic material such as flyash or slags for the purpose of forming concrete or mortar. Sludges produced by lime neutralization of acids from any of several processes can be used in the process of the invention and may be used in conjunction with waste from many processes as a means of capturing environmentally-hazardous materials and rendering them stable.
  • Neutralized acid sludges and the like waste sludges containing heavy and toxic metals are produced from a variety of sources.
  • sludges are produced by neutralized mine waste run-off water, mine tailings and neutralized excess process water, neutralized solutions of run-off waters from exposed pyrite or other acid- producing surfaces at fresh road and construction sites, neutralized pickle liquors, plating waste, chemical plant waste, water treatment plant waste, wet scrubber effluent neutralization sludges and sludges from power plants using powdered limestone, calcined lime or hydrated lime for gaseous sulphur dioxide control.
  • the aqueous sludges are substituted for up to 80%, preferably up to 30%, by volume of Portland cement or pozzolanic material such as flyash or slags used in the forming of concrete, or the like cementation mixes.
  • the water content of the sludge provides the water necessary for hydration of the cement or the pozzolanic material.
  • the resulting mixture can be mixed with an aggregate such as sand or sand and gravel in a conventional manner of, for example, 1 part cement or equivalent, 2 parts sand and 3 parts aggregate.
  • Tests were conducted on a standard concrete sample and on concrete samples made from cement - sludge compositions for evaluating compressive strengths in accordance with CSA Standard CAN3-A23.2-9C-M90 entitled "Compressive Strength of Cylindrical Concrete Specimens".
  • the standard concrete sample tested consisted of 1 part cement (Type 10 Portland cement) , 2 1/4 parts sand and 3 parts 0.95 cm (3/8") aggregate by volume, mixed with water of hydration in a ratio of 250 ml of cement to 250 ml of water.
  • the sludge was obtained from La Mine Doyon and was densified to 39% solids by weight.
  • the samples were cylinders having a diameter of 5.87 cm (2 5/16") and a height of 14.29 cm (5 5/8") which were cured for 28 days.
  • Sample 1 was a standard concrete test for a standard value and Samples 2-9 were based on progressively increasing replacements of cement by the slurry densified to 39% solids by volume. TABLE 1
  • the present invention provides a number of important advantages.
  • a portion of cement in a mortar or concrete mix or of the water of hydration in said mix can be replaced by a neutralized acid slurry to produce a resulting mortar or concrete which not only has a compressive strength comparable, to that of a conventional mortar or concrete produced by the use of Portland cement but also the heavy toxic metals present in the neutralized sludge " has been rendered essentially inert and resistant to leaching by ground waters.
  • the resulting concrete can be formed into end products such as walls, building structures, concrete blocks, sidewalks or roadways. Valuable energy otherwise needed to sinter or fuse the heavy toxic metals into a granular product is bypassed, the heavy toxic metals being directly converted into an inert form in a mortar or concrete mass.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Inorganic Chemistry (AREA)
  • Treatment Of Sludge (AREA)

Abstract

Procédé permettant de rendre essentiellement inertes des métaux lourds toxiques dans des boues neutralisées et d'en faire une masse de béton ou de mortier, en remplaçant lesdites boues aqueuses neutralisées par un matériau pouzzolanique ou de ciment en une quantité efficace allant jusqu'à 80 % dudit matériau pouzzolanique ou de ciment par volume de mélange de béton ou de mortier, en y ajoutant une quantité efficace d'eau d'hydratation, et en laissant le mélange ainsi obtenu se durcir pour devenir une masse solide de béton ou de mortier. La masse d'hydratation peut être remplacée par lesdites boues aqueuses neutralisées en une quantité efficace allant jusqu'à 100 % par volume d'eau d'hydratation.
PCT/CA1991/000440 1990-12-10 1991-12-10 Procede de production de beton et de mortiers WO1992010439A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9026779.0 1990-12-10
GB9026779A GB9026779D0 (en) 1990-12-10 1990-12-10 Process for making concrete & mortars using sludges from acidic water neutralization

Publications (1)

Publication Number Publication Date
WO1992010439A1 true WO1992010439A1 (fr) 1992-06-25

Family

ID=10686750

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1991/000440 WO1992010439A1 (fr) 1990-12-10 1991-12-10 Procede de production de beton et de mortiers

Country Status (3)

Country Link
AU (1) AU9064691A (fr)
GB (1) GB9026779D0 (fr)
WO (1) WO1992010439A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0591895A2 (fr) * 1992-10-05 1994-04-13 Heinz Prof. Dr. Sc. Dr.-Ing. Hölter Matériau de construction, de remblayage ou de charge
ES2142269A1 (es) * 1998-02-26 2000-04-01 Empresarial Ubena B B S S L Metodo de tratamiento y valoracion de lodos de depuradora.
US7072704B2 (en) 1990-10-19 2006-07-04 St. Louis University System for indicating the position of a surgical probe within a head on an image of the head
CN109626905A (zh) * 2018-12-29 2019-04-16 紫金矿业集团股份有限公司 一种基于中和渣用于井下充填的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113248203B (zh) * 2021-05-24 2021-12-21 佛山市南海区西樵恒建混凝土有限公司 一种抗渗高强度混凝土及其制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0128966B1 (fr) * 1983-06-15 1987-01-07 Georg Dr. Fritsch Procédé pour l'évacuation de boues industrielles
EP0120097B1 (fr) * 1983-03-18 1988-10-26 LEONHARD WEISS GmbH & Co. Procédé pour la solidification de boue

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0120097B1 (fr) * 1983-03-18 1988-10-26 LEONHARD WEISS GmbH & Co. Procédé pour la solidification de boue
EP0128966B1 (fr) * 1983-06-15 1987-01-07 Georg Dr. Fritsch Procédé pour l'évacuation de boues industrielles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, C Section, Vol. 2, No. 155, 26 December 1978, page 3857 C 78; & JP,A,53 124 165, (OTSUKA KAGAKU YAKUHIN K.K.). *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7072704B2 (en) 1990-10-19 2006-07-04 St. Louis University System for indicating the position of a surgical probe within a head on an image of the head
EP0591895A2 (fr) * 1992-10-05 1994-04-13 Heinz Prof. Dr. Sc. Dr.-Ing. Hölter Matériau de construction, de remblayage ou de charge
EP0591895A3 (en) * 1992-10-05 1994-07-13 Hoelter Heinz Building, stowing, or filling material
ES2142269A1 (es) * 1998-02-26 2000-04-01 Empresarial Ubena B B S S L Metodo de tratamiento y valoracion de lodos de depuradora.
CN109626905A (zh) * 2018-12-29 2019-04-16 紫金矿业集团股份有限公司 一种基于中和渣用于井下充填的方法

Also Published As

Publication number Publication date
AU9064691A (en) 1992-07-08
GB9026779D0 (en) 1991-01-30

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