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WO2008137647A1 - Procédé de traitement de matières particulaires contenant un métal lourd et additif à utiliser dans un tel procédé - Google Patents

Procédé de traitement de matières particulaires contenant un métal lourd et additif à utiliser dans un tel procédé Download PDF

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Publication number
WO2008137647A1
WO2008137647A1 PCT/US2008/062372 US2008062372W WO2008137647A1 WO 2008137647 A1 WO2008137647 A1 WO 2008137647A1 US 2008062372 W US2008062372 W US 2008062372W WO 2008137647 A1 WO2008137647 A1 WO 2008137647A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight
calcium silicate
forming material
particulate
silicate forming
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.)
Ceased
Application number
PCT/US2008/062372
Other languages
English (en)
Inventor
Redmond R. Clark
James Lively
Chris Scott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBL Industrial Services Inc
Original Assignee
CBL Industrial Services Inc
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
Priority claimed from CA2587301A external-priority patent/CA2587301C/fr
Priority claimed from US11/743,959 external-priority patent/US8075666B2/en
Application filed by CBL Industrial Services Inc filed Critical CBL Industrial Services Inc
Publication of WO2008137647A1 publication Critical patent/WO2008137647A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • C22B7/02—Working-up flue dust
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/18—Arrangements of dust collectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/20—Arrangements for treatment or cleaning of waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/30—Arrangements for extraction or collection of waste gases; Hoods therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2200/00—Recycling of non-gaseous waste material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • 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
    • 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

Definitions

  • PROCESS FOR TREATING PARTICULATE MATERIAL CONTAINING HEAVY METAL AND AN ADDITIVE FOR USE IN SUCH PROCESS
  • the present invention relates generally to methods for treating cupola and electric arc furnace dust and other waste materials generated during manufacturing processes. More specifically, the present invention relates to an environmentally acceptable closed system process for treating environmentally hazardous heavy metal oxides generated during ferrous metal and nonferrous scrap remelt operations.
  • Foundries use a range of melt technologies to produce liquid iron and steel for casting. The melt technologies used include cupolas, induction furnaces, and electric arc furnaces. Scrap metal is fed into the furnace or melt vessel and the metal is subjected to intense heat to induce melting. As a byproduct of that melting process, waste gases and particulates are generated and collected above the melt vessel.
  • Disposal of hazardous waste often requires one or more types of waste treatment before disposal, and the management of these hazardous wastes is typically more expensive than non-hazardous wastes.
  • foundry bag house wastes that are hazardous usually have unacceptable levels of one or more RCRA-regulated heavy metals, including arsenic, barium, cadmium, chromium, lead, mercury, selenium and silver.
  • RCRA-regulated heavy metals including arsenic, barium, cadmium, chromium, lead, mercury, selenium and silver.
  • RCRA Solid Waste Disposal Act, as amended by the Resource Conservation and Recovery Act of 1976 and the Hazardous and Solid Waste amendments of 1984 (collectively "RCRA").
  • RCRA controls and regulates the collection of bag house dust and like hazardous wastes. If a system generates hazardous waste, then treatment of the hazardous waste requires a RCRA treatment permit prior to treatment of the waste for disposal. See, 40 CFR Section 261.4 (c).
  • the bag house dust contains a variety of types of metallic oxide particles including RCRA 8 toxic heavy metals in sufficiently high concentrations to be classified as hazardous by the US Environmental Protection Agency and its state counterparts. Because this bag house dust is generated by subjecting scrap metal to high temperatures, the dust contains oxides and is extremely dry. [0009] Typical foundry furnace bag house dusts can include oxides of the following component metals:
  • One aspect of the present invention provides an improved process for treating particulate material containing heavy metal oxides generated during a manufacturing process so that the treatment process is part of the manufacturing process unit and accordingly affords a closed or enclosed system.
  • the process includes combining an additive consisting essentially of calcium silicate forming material with the particulate material containing regulated heavy metal oxides, optionally within an enclosed area, to create an additive-particulate material blend.
  • Another aspect of the invention further includes passing the additive- particulate material into a waste collection device.
  • the waste collection device can be located downstream of the enclosed area.
  • the enclosed area can be a duct, and the additive is passed into the duct at a feed point. Further, a fin can be provided in the duct downstream of the feed point.
  • the calcium silicate forming material comprises particles with a particle size of minus 50 to plus 325 mesh.
  • the calcium silicate forming material comprises particles with a particle size of minus 100 to plus 300 mesh.
  • the calcium silicate forming material comprises 40 - 50% by weight of particles with a particle sizes of minus 170 to plus 300 mesh.
  • the additive consisting essentially of calcium silicate forming material comprises particles having the following size fraction ranges: ⁇ minus 50 to plus 60 mesh: 10 - 20% by weight
  • the process for treating particulate material containing heavy metal generated during a manufacturing process includes feeding the calcium silicate forming material into the enclosed area by injecting the calcium silicate forming material through an injector unit.
  • the calcium silicate forming material is pneumatically fed into the injector unit.
  • the calcium silicate forming material is gravity-fed into the injector unit.
  • the calcium silicate forming material is fed from a dry material feeder into an injector.
  • the calcium silicate forming material is suction-fed from a dry material feeder through a branch line into the process duct, using the venturi effect caused by the flow of gas through the process duct.
  • Another aspect of the invention is a process for treating and collecting heavy metal contaminated dust generated during a manufacturing process.
  • the process includes passing particulate material through at least one enclosed area and toward a waste collection device, feeding an additive comprising calcium silicate forming material with a particle size of minus 50 to plus 325 mesh into the enclosed area to be mixed with the particulate material to create an additive-particulate material upstream from the waste collection device; and passing the additive-particulate material mixture into the waste collection device.
  • Another aspect of the invention is a process for collecting and pre-treating metallic oxide impregnated dust generated in a manufacturing unit during a manufacturing process.
  • the process includes passing metallic oxide impregnated dust in an air or fluid stream from an industrial process to a waste generation point and a waste collection device, injecting an additive consisting essentially of calcium silicate forming material into the metallic oxide impregnated dust stream generated by the industrial process at a point upstream from the waste collection device, and collecting the blended metallic oxide impregnated dust and calcium silicate forming material in a waste collection device.
  • Another aspect of the invention is an additive for use in a process for treating metallic oxide impregnated dust, wherein the additive has a particle size of plus
  • a material comprising minus 50 to plus 325 mesh calcium silicate forming material is also provided.
  • the new method can sharply reduce the amounts of silicates required to render these wastes non-hazardous.
  • Consisting essentially of with reference to an additive consisting essentially of particulate calcium silicate forming material, is defined here in part as containing less calcium sulfoaluminate in the calcium silicate forming material than is contained in Type I Portland cement.
  • FIGURE illustrates a schematic view of an embodiment of the process of the present invention.
  • the present invention provides an improved process for treating environmentally hazardous metallic oxide impregnated dusts as well as other materials. More specifically, the present invention provides an improved method and additive for treating bag house dust, or other dust, that is generated during the scrap remelting process, in a manner so that the treatment process is either part of the manufacturing process. This results in a remelt process that is afforded the totally enclosed treatment exemption by the Environmental Protection Agency, or is not considered treatment at all if done before waste is produced according to the regulatory standard.
  • the treatment process can be located downstream from the cupola or other source of heavy metal waste but upstream from the bag house or other waste removal process or equipment.
  • the present invention is directed specifically to scrap metal remelting processes, it should be appreciated that the method of the present invention can be utilized in other processes that generate heavy metal contaminated particulate wastes.
  • the present invention relates to foundry and steel industry scrap remelting processes. Specifically, in an alternative embodiment, the present invention relates to foundry processes that utilize scrap metal and thereby generate bag house dust.
  • bag house dust refers to particles generated during the melting of scrap metal in a furnace such as cupola or electric arc furnaces. This dust contains a variety of metal oxide particles including one or more of the RCRA 8 toxic heavy metals in sufficiently high concentrations so as to be classified as hazardous by the Environmental Protection Agency. Currently, the US Environmental Protection Agency and its state counterparts set mandated treatment levels required for disposal of those wastes.
  • Required heavy metal treatment levels for those hazardous wastes are: arsenic, ,1.0 mg/l; barium, ⁇ 21 mg/l; cadmium, ⁇ 0.11 mg/l; chromium, ⁇ 0.60 mg/l; lead, ⁇ 0.75 mg/l; mercury, O.025 mg/l; selenium ⁇ 0.14 mg/l; and silver, ⁇ 0.14 mg/l; Because metallic oxide dust or bag house dust generated in a foundry utilizing scrap metal often includes heavy metal oxides that exceed these levels, the dust must be treated and disposed of in a manner in accordance with the regulations and requirements of the Environmental Protection Agency and its state counterparts.
  • the foundry process of the present invention includes a cupola 10.
  • the cupola 10 is a vertical cylindrical furnace for melting scrap metal for foundry use.
  • the cupola 10 can be a coke fired furnace. However, any furnace known in the art can be utilized.
  • metal, coke, and flux are fed into the cupola 10 onto a bed of coke, through which air is blown.
  • the cupola 10 generates a gas that includes particulate matter including metallic oxide impregnated particles. Often, the metallic oxide particles include heavy metal oxides that exceed permissible toxicity levels set by the
  • the gas and solids in this embodiment flow out of the cupola 10 through at least one duct 12.
  • An apparatus 14 for treating the metallic oxide impregnated dust present in the gas can be coupled to the duct 12 and functions to inject into the duct 12 an additive consisting essentially of particulate calcium silicate forming material that mixes in the dust stream.
  • Other arrangements for introducing the calcium silicate forming material into the duct can also be used.
  • the calcium silicate forming material useful in this invention forms dicalcium silicates, tricalcium silicates, or a mixture of these materials upon contact with moisture during or after the contemplated process.
  • a suitable calcium silicate forming material comprises a mixture of SiO 2 and CaO.
  • Optional additional ingredients of the calcium silicate forming material are contemplated, including one or more of the following: AI 2 O 3 , Fe 2 O 3 , MgO, and K 2 O.
  • the amount of SiO 2 in the calcium silicate forming material can be 5% to
  • the amount of CaO in the calcium silicate forming material can be 15% to
  • the amount of AI 2 O 3 in the calcium silicate forming material can be 0% to
  • the amount of Fe 2 O 3 in the calcium silicate forming material can be 0% to
  • the amount of MgO in the calcium silicate forming material can be 0% to
  • the calcium silicate forming material does not require any calcium sulfoaluminate, and is therefore chemically distinct from Portland cement. It is preferably entirely free of calcium sulfoaluminate, although embodiments containing less calcium sulfoaluminate than Type I Portland cement are also contemplated.
  • the calcium silicate forming material is a binder forms calcium silicates and binds with the heavy metal oxides when the treated waste is contacted by water. Water may be added deliberately, or the treated waste can be disposed of while dry, and when environmental water such as rain or ground water comes into contact with the treated waste, it will bind the heavy metal oxides, preventing leaching of the heavy metals.
  • the calcium silicate forming material has a pH of at least 8 and therefore, when it binds with the metallic oxide particles, it chemically stabilizes them. Accordingly, when the calcium silicate forming material and oxide particles are disposed of, the calcium silicate forming material prevents the metallic oxide particles from leaching out even when the mixture is subjected to a low pH solution such as acid rain.
  • the degree of waste treatment can be sufficient to reduce the proportion of one or more of the regulated heavy metals to below the maximum levels allowed for non-hazardous (RCRA Subtitle D) landfill disposal, alternatively sufficient to reduce the leachable proportion of one or more heavy metals to below the minimum amount that can be detected by the employed and US EPA-required test method.
  • the additive is comprised of particles of calcium silicate forming material ground to a particle size of minus 50 to plus 325 mesh, U.S. Standard Sieve Series.
  • the calcium silicate forming material is comprised of particles with a particle size of minus 100 to plus 300 mesh.
  • the calcium silicate forming material is comprised of particles with particle sizes of minus 170 to plus 300 mesh.
  • the calcium silicate forming material comprises particles having the following size fraction ranges:
  • minus 50 to plus 60 mesh 10 - 20% by weight minus 60 to plus 70 mesh: 5 - 15% by weight minus 70 to plus 80 mesh: 2 - 10% by weight minus 80 to plus 100 mesh: 5 - 15% by weight minus 100 to plus 140 mesh: 10 - 20% by weight minus 170 to plus 300 mesh: 40 - 50% by weight
  • the apparatus 14 for treating the dust includes apparatus for introducing the calcium silicate forming material into the duct 12 and apparatus for delivering the calcium silicate forming material to the apparatus for injecting.
  • a bucket closed system elevator 16 is provided.
  • the bucket 16 provides a container into which a charge of calcium silicate forming material is placed.
  • An elevator 18 is provided that conveys the bucket 16 from ground level to a metering feeder and holding hopper 20.
  • a bucket closed system elevator 16 is illustrated, any apparatus for conveying the material can be utilized.
  • the feeder 20 functions to feed the calcium silicate forming material to a fluidizer 22 and venturi eductor 23.
  • the venturi eductor 23 functions to inject the calcium silicate forming material into the duct 12 and thereby into the gas and dust stream to unite and bind with the metallic oxide particles.
  • the feeder 20 can be a dry material feeder that has good volumetric metering accuracy. It has been found that a feeder available from AccuRate of Whitewater, Wisconsin, such as the 604 AccuRate Dry Material Feeder, functions satisfactorily. This dry material feeder has a volumetric metering accuracy of approximately +0.5 to 2 percent for most materials. Accordingly, the feeder 20 accurately feeds to the fluidizer 22 and venturi eductor 23, and thus to the gas in the duct 12, an appropriate amount of calcium silicate forming material.
  • the feeder 20 can also be a gravity feeder, pneumatic feeder, or any other type of feeder known in the art.
  • the amount of calcium silicate forming material used can be 1-20%, alternatively 1- 15%, alternatively 1-10%, alternatively about 1-6%, alternatively about 1-5%, alternatively about 1-4%, alternatively about 1-3% by weight of the process material to be treated.
  • the amount of treatment material can also be an amount determined to be effective to reduce the amount of leachable heavy metals, by the EPA test, to less than the maximum amounts permitted for non-hazardous waste.
  • the calcium silicate forming material is fed from the feeder 20 into a special fluidizer 22.
  • the fluidizer 22 injects, through a venturi eductor 23, the calcium silicate forming material into the gas and dust stream.
  • the venturi eductor 23 can be activated by a solenoid valve.
  • the venturi eductor 23 allows one to vary the air pressure at which the calcium silicate forming material is injected.
  • the calcium silicate forming material mixes with the particulate matter, and specifically binds with the metal oxide materials contained therein.
  • the calcium silicate forming material is added upstream of the bag house 25.
  • a closed system as that term is defined by the Environmental Protection Agency, can be provided and the calcium silicate forming material can be combined with the material in the bag house 25 without the need for a treatment permit.
  • venturi eductor 23 Although only one venturi eductor 23 is illustrated, it may be desirable to utilize two or more injectors or other material feed apparatus at various locations before the bag house.
  • a blower 31 is provided for urging the dust and gas from the duct 12 into a second duct 24 toward the bag house 25.
  • the calcium silicate forming material can be injected by use of the blower 31.
  • the venturi eductor 23 can be located so that the calcium silicate forming material is injected after the blower 31 that conveys the mixture through another duct 24 into the bag house 25.
  • the duct 24 includes a plurality of fins 41 that direct and channel air flow and thereby assist in integrating the particles.
  • fin 41 refers to adjustable plates that are placed in the duct 24.
  • the fins 41 preferably are pivotably connected to an interior of the duct 24 so that they are adjustable. Although a plurality of fins are illustrated, it should be noted that a single fin can be utilized.
  • pretreated metal oxides and other particles are collected in collection bins 26, 28, and 30.
  • an auger 32 is located below the collection bins 26, 28, and 30,. The auger 32 functions to move the dust present in the gas and calcium silicate forming material to apparatus for disposing of the materials, which may be conventional.
  • the material and calcium silicate forming material are collected in a hopper, it should be noted that the material can be collected in some other manner, for example, in a mixing auger.
  • the apparatus for treating 14 is located upstream from the bag house 25, therefore, the treatment process is part of the manufacturing process, so the treatment process is not restricted or licensed by the US
  • a large foundry with a cupola melting technology generates very large volumes of hazardous bag house dust annually.
  • This untreated dust has levels of lead that range from 2,600 ppm to over 5,700 ppm, and this same foundry has levels of cadmium that routinely exceed 100 ppm.
  • the waste is routinely hazardous for both lead and cadmium, and as a result, the US EPA requires that the wastes meet Universal Treatment Standards (UTS) before disposal.
  • UTS Universal Treatment Standards
  • the generator finds that the extractable cadmium is 1.2 mg/l (the EPA UTS level for cadmium is .11 mg/l). This means that the bag house wastes are hazardous under US EPA Subtitle C regulations.
  • Minus 50 to plus 60 mesh 10 - 20% by weight
  • Minus 60 to plus 70 mesh 5 - 15% by weight
  • Minus 70 to plus 80 mesh 2 - 10% by weight
  • Minus 80 to plus 100 mesh 5 - 15% by weight
  • Minus 100 to plus 140 mesh 10 - 20% by weight
  • Minus 140 to plus 170 mesh 5 - 15% by weight
  • Minus 170 mesh to plus 300 mesh 40 - 50% by weight
  • a large foundry with an electric arc melting technology generates very large volumes of hazardous bag house dust annually.
  • This untreated dust has levels of lead that range from 290 ppm to over 320 ppm.
  • the extractable lead is 8.9 mg/l.
  • These wastes are hazardous under US EPA Subtitle C waste management regulations, and must be treated to meet the UTS standard for lead before they can be disposed in a landfill. (The US EPA UTS requirement for lead is 0.75 mg/l).
  • the extractable lead level is 4.1 mg/l, showing only a 54% by weight reduction from the untreated sample. This value exceeds the UTS lead threshold of .75mg/l, indicating that it is not compliant with the waste disposal standard for lead- contaminated hazardous wastes
  • the calcium silicate forming material was ground to meet the same size standard set forth in Example 1. No calcium sulfoaluminate was added. [00068] A split of the same waste sample was subjected to a treatment application rate of 6% by weight. The measured extractable lead value was non-detectable (less than 0.2 mg/l) and compliant with the UTS lead threshold of .75 mg/l. [00069] In both working examples above, the coarsely ground calcium silicate compound produced measurably better test results when compared to a similar addition rate of Portland cement. This also means that when compared to Portland cement, similar results were generated with the use of the coarsely ground calcium silicate forming material at a 60% by weight reduction in the admixture application rate, compared to the historic application weight for the prior material of about 15% by weight.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Inorganic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Cette invention concerne un procédé de traitement de matières particulaires contenant un métal lourd générées pendant un procédé de fabrication. Le procédé comprend les étapes consistant à diriger dans une zone fermée une matière particulaire contenant un métal lourd et mélanger à la matière particulaire un additif fait d'une matière de formation de silicate de calcium, dans la zone fermée pour créer une matière particulaire avec additif. La matière particulaire avec additif peut être dirigée vers un dispositif de collecte de déchets positionné en aval de la zone fermée. La matière de formation de silicate de calcium peut être fournie sous forme de particules ayant une dimension granulométrique de moins 50 à plus 325 mesh. Un aspect supplémentaire de l'invention est un additif à utiliser dans un tel procédé de traitement de poussières imprégnées d'oxyde métallique, qui a une dimension granulométrique de plus 325 mesh et consiste sensiblement en une matière de formation de silicate de calcium.
PCT/US2008/062372 2007-05-03 2008-05-02 Procédé de traitement de matières particulaires contenant un métal lourd et additif à utiliser dans un tel procédé Ceased WO2008137647A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US11/743,959 2007-05-03
CA2,587,301 2007-05-03
CA2587301A CA2587301C (fr) 2007-05-03 2007-05-03 Procede de traitement de materiau particulaire contenant du metal lourd et un additif pour ce traitement
US11/743,959 US8075666B2 (en) 2007-05-03 2007-05-03 Process for treating particulate material containing heavy metal and an additive for use in such process

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WO2008137647A1 true WO2008137647A1 (fr) 2008-11-13

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988010243A1 (fr) * 1987-06-18 1988-12-29 Bethlehem Steel Corporation Procede de stabilisation chimique de boues et de poussieres contenant des metaux lourds, telles que des poussieres provenant des fours a arc electrique
GB2217314A (en) * 1988-04-20 1989-10-25 Energiagazdalkodasi Intezet Embedment of dangerous wastes containing heavy metals
US4878944A (en) * 1988-10-18 1989-11-07 The Tdj Group, Inc. Method of treating metallic oxide impregnated dust
JPH06170162A (ja) * 1992-12-10 1994-06-21 Mitsubishi Heavy Ind Ltd 排ガス中の有害金属の捕集方法及び捕集灰の処理方法
JPH09108647A (ja) * 1995-10-20 1997-04-28 Asahi Chem Ind Co Ltd 重金属の固定化材と固定化方法
EP0801971A1 (fr) * 1995-10-06 1997-10-22 Kaneka Corporation Procede de traitement des gaz brules et des poussieres
JP2001149743A (ja) * 1999-11-25 2001-06-05 Sumitomo Osaka Cement Co Ltd 排ガス処理剤及び排ガス処理方法
JP2001205047A (ja) * 2000-01-27 2001-07-31 Sumitomo Osaka Cement Co Ltd 排ガス及びばいじんの処理方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988010243A1 (fr) * 1987-06-18 1988-12-29 Bethlehem Steel Corporation Procede de stabilisation chimique de boues et de poussieres contenant des metaux lourds, telles que des poussieres provenant des fours a arc electrique
GB2217314A (en) * 1988-04-20 1989-10-25 Energiagazdalkodasi Intezet Embedment of dangerous wastes containing heavy metals
US4878944A (en) * 1988-10-18 1989-11-07 The Tdj Group, Inc. Method of treating metallic oxide impregnated dust
JPH06170162A (ja) * 1992-12-10 1994-06-21 Mitsubishi Heavy Ind Ltd 排ガス中の有害金属の捕集方法及び捕集灰の処理方法
EP0801971A1 (fr) * 1995-10-06 1997-10-22 Kaneka Corporation Procede de traitement des gaz brules et des poussieres
JPH09108647A (ja) * 1995-10-20 1997-04-28 Asahi Chem Ind Co Ltd 重金属の固定化材と固定化方法
JP2001149743A (ja) * 1999-11-25 2001-06-05 Sumitomo Osaka Cement Co Ltd 排ガス処理剤及び排ガス処理方法
JP2001205047A (ja) * 2000-01-27 2001-07-31 Sumitomo Osaka Cement Co Ltd 排ガス及びばいじんの処理方法

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