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EP2002023A1 - Systeme de recyclage de materiaux de fabrication d'acier - Google Patents

Systeme de recyclage de materiaux de fabrication d'acier

Info

Publication number
EP2002023A1
EP2002023A1 EP20020750224 EP02750224A EP2002023A1 EP 2002023 A1 EP2002023 A1 EP 2002023A1 EP 20020750224 EP20020750224 EP 20020750224 EP 02750224 A EP02750224 A EP 02750224A EP 2002023 A1 EP2002023 A1 EP 2002023A1
Authority
EP
European Patent Office
Prior art keywords
pcm
steel
processing material
dried
steel processing
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.)
Withdrawn
Application number
EP20020750224
Other languages
German (de)
English (en)
Inventor
Scott B. Kimmel
Willard K. Mcclintock
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.)
Kimmel's Coal And Recycling Inc/ghent Operation
Gallatin Steel Co
Original Assignee
Kimmel's Coal And Recycling Inc/ghent Operation
Gallatin Steel Co
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 Kimmel's Coal And Recycling Inc/ghent Operation, Gallatin Steel Co filed Critical Kimmel's Coal And Recycling Inc/ghent Operation
Publication of EP2002023A1 publication Critical patent/EP2002023A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/54—Processes yielding slags of special composition
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/076—Use of slags or fluxes as treating agents
    • 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

  • FEM Furnace Exhaust Material
  • an exhaust system is used to direct this material to a bag house.
  • the FEM typically is very high in iron (Fe) content.
  • Some of this material, called post combustion material (PCM) comprises particles that are too heavy or too large to be exhausted to the bag house.
  • PCM post combustion material
  • Such material can be gravity fed from the combustion chamber to a drop out box or similar arrangement.
  • FEM is generated from the post combustion chamber drop out box as PCM or is evacuated on to the bag house as bag house dust.
  • the iron content from either location is typically about 40% by weight. However, the iron content can vary from about 20% to about 75% by weight.
  • the combustion chamber or the post combustion chamber duct work of a steel manufacturing assemblies are often water cooled. Water from leaks, sprays or any other source may travel by gravity through the post combustion chamber and wet the post combustion material.
  • Post combustion material removed from the drop out box is typically stored in an outside yard for further disposition. Either in the drop out box or in the yard, the PCM can absorb a great deal of moisture from the atmosphere, rain or other sources.
  • the moisture content of wet PCM is usually significantly above 2% and usually is greater than 6% and, more typically, is about 15-20%, all by weight. However, some processes may avoid the moisture pickup thus delivering a dry PCM, containing less than about 2% by weight moisture content.
  • PCM undergoes an expensive secondary reclamation processes to recover the heavy metals or is sent to landfills for disposal.
  • the use of secondary reclamation processes to recover the heavy metals are generally very expensive.
  • Such processes require expensive equipment, extensive handling of the material, and the use of chemical additives. After processing, the material may still not be desirable in many applications.
  • U. S. Patent No. 5,738,694, to Ford dislcoses an example of the secondary processing of similar material. Ford discloses iron rich material waste products, such as electric arc furnace dust, formed with an organic binder into discrete shapes, such as briquettes and/or other solid shapes. The shapes can then be used in iron and steel making processes and may allow recovery of the iron and heavy metals values in the waste product.
  • the invention relates to steel processing materials.
  • the steel processing materials comprise a dried post combustion material (PCM) and a slag foaming material.
  • a steel processing material comprises a recycled material and a slag foaming material.
  • Fig. 1 illustrates a schematic view of an exemplary embodiment of a PCM reclamation facility in accordance with the present invention. Detailed Description of Exemplary Embodiments
  • Solid waste material such as Furnace Exhaust Material (FEM) is generated by the steel making process.
  • FEM Furnace Exhaust Material
  • the current invention contemplates removing some of the moisture content and/or otherwise recycling FEM material back into the process.
  • the FEM is typically generated as particles collected from a drop out box, known as Post Combustion Material (PCM), or dust from the bag house, as described above.
  • PCM Post Combustion Material
  • Furnace exhaust material as used in this invention should be understood to cover any iron-bearing material from the exhaust of a steel making furnace.
  • Such furnaces may include a basic oxygen furnace, an electric arc furnace, a degasser, or any similar furnace creating solid material from the exhaust chamber.
  • the recycled steel making material as used in the current invention further includes iron-bearing solid waste materials such as iron fines, scale, iron oxide from pickle liquor, or other similar steel making materials as known to those skilled in the art. .
  • Reintroducing the PCM back into the process may also cause the foamy slag characteristics of the furnace to be changed because the moisture of the PCM decreases the effectiveness of the foamy slag.
  • the chemical reactions between the steel and slag may be decreased and poor coverage of the steel by the foamy slag may occur.
  • Nitrogen pickup may also increase as poor coverage of the foamy slag allows air to contact the liquid steel.
  • the dried PCM can be sorted further. This may include screening to give a size that will not block or clog an injection gun as is commonly used to add slag foaming material in an electric arc furnace. This screening may be to about 5/16 of an inch (0.8 cm), i.e., to the size of the slag foaming material.
  • the PCM Once the PCM has been sized to about 5/16 of an inch (0.8 cm), it can proceed, for example, via a bucket elevator, into a first PCM container such as a silo. Once in a first container, the PCM can be discharged into a second container such as a super sack or a truck.
  • the first screen 42 screens the PCM to obtain a fraction having a desired maximum particle size, for example, of about 3/4 inch (2 cm).
  • the screened PCM fraction of the desired size is delivered via a discharge conveyer 44 to a first screen fraction or stockpile 46.
  • Material too large to be screened by the first screen 42 may be stockpiled, for example, in a screened "overs" stockpile 70, or otherwise processed to reduce its size, or discarded.
  • Material from the first screened fraction stockpile 46 is transported, for example by a front end loader, a conveyor or the like to a second receiving hopper 50.
  • the PCM is next fed from the second receiving hopper 50 to screw auger 52.
  • the auger 52 can be a heated, dewatering auger in certain embodiments.
  • the material is transported by a feed conveyor 54 to a second screen 56.
  • the second screen 56 comprises a 4' by 8' (120 x 240 cm) single deck scalping screen.
  • the second screen 56 screens the PCM to obtain a fraction having a maximum particle size about 1/4 inch (0.5 cm).
  • the screened PCM fraction is transported, for example, by a bucket elevator 58, to a first storage silo 60.
  • a second storage silo 62 is adjacent the storage silo 60.
  • the second storage silo 62 may contain any of a variety of slag foaming materials such as anthracitic coal, coke, or any other carbon and/or any other low sulfur product known to those skilled in the art for use in a steel making process.
  • the slag foaming material may additionally include materials such as dolomite or spar.
  • the two storage silos can have a single load out spout (not shown). The single load out spout may allow for mixing of the two materials concurrent with addition of the materials to a container such as a transport truck. Other sources of high iron-bearing steel waste material may be similarly recycled. Such materials include bag house dust, scale and iron fines.
  • iron-bearing materials such as those generated by the steel cold finishing processes, may also be mixed with slag foaming material to provide a steel processing material.
  • the iron fines recovered from cold mill rolling solution or temper mill rolling solution or from cleaning processes, such as a cleaning process in galvanizing line may also be used. Again, these materials may be wet or of sufficiently large size that drying and/or screening may be necessary. Drying, screening, and/or mixing processes as discussed above may be employed. These materials are typical of high Fe content and may behave similar to PCM in that the oxidation of the iron is an exothermic reaction.
  • a relatively high purity iron oxide may be recovered from spent pickle liquor. This material, though possibly already dried by a roaster, may become wet or otherwise increase to moisture content. This material, too, may be screened, dried, and/or mixed according to the methods previously discussed for use with the PCM. Depending on the particular iron oxide materials available an exothermic reaction with the high temperature slag could occur.
  • the dried and mixed PCM contains about 45% by weight of iron and about 1.7% by weight of manganese. This equates to about 144 pounds (65 kg) of iron and 5.4 pounds (2.5 kg) of manganese.
  • One hundred forty-four pounds (65 kg) of iron, when oxidized during the melting process from approximately 76° F to 2,900° F (24° C to 1600° C) would create about 85 kilowatt hours (300 mega- joules), if reacted 100% to completion. However, at only 50% reaction, 43 kilowatt hours (150 mega-joules) would be produced.
  • batch charging recovered PCM increases both power usage and the time necessary to melt a heat. These factors, along with possible decreased quality in steel, make recharging PCM directly very expensive, especially when considering that newly recovered PCM may increase power usage by approximately 8%. Alternatively, the dried and mixed PCM may decrease power usage by approximately 10%.
  • the PCM may become wet from leaks, sprays, rain or any other source inside or external to the exhaust duct or to the drop out box.
  • the PCM may need drying in accordance with the methods discussed above. Drying may be achieved by a screw auger, a rotary dryer, or the like.
  • the PCM may not be wet, having a moisture content less than about 2% by weight, and may proceed directly to further processing steps.
  • a method of sorting the PCM before drying may be used to properly size the particles for the drying process.
  • a method of further sorting before storing, mixing, or injecting of the PCM may be used as previously discussed.

Landscapes

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

Abstract

L'invention porte sur le recyclage de matériaux de fabrication d'acier réintroduits dans le processus. Différents modes de réalisation selon l'invention concernent des procédés de préparation et de fabrication de matériaux de traitement d'acier contenant au moins en partie des matériaux de fabrication d'acier recyclés. Dans un mode de réalisation, le matériau de traitement d'acier comporte un matériau de postcombustion séché (PCM), le matériau de fabrication d'acier recyclé, et un matériau expansible de laitier. Dans différents modes de réalisation selon l'invention, le matériau de fabrication d'acier recyclé peut contenir des matières humides ôtées et/ou peut être fixé à d'autres matériaux de traitement.
EP20020750224 2001-07-20 2002-07-20 Systeme de recyclage de materiaux de fabrication d'acier Withdrawn EP2002023A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/909,487 US20030015063A1 (en) 2001-07-20 2001-07-20 Steel making material recycling system
PCT/US2002/023205 WO2003008651A1 (fr) 2001-07-20 2002-07-20 Systeme de recyclage de materiaux de fabrication d'acier

Publications (1)

Publication Number Publication Date
EP2002023A1 true EP2002023A1 (fr) 2008-12-17

Family

ID=25427307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020750224 Withdrawn EP2002023A1 (fr) 2001-07-20 2002-07-20 Systeme de recyclage de materiaux de fabrication d'acier

Country Status (5)

Country Link
US (2) US20030015063A1 (fr)
EP (1) EP2002023A1 (fr)
CA (1) CA2459112A1 (fr)
MX (1) MXPA04001602A (fr)
WO (1) WO2003008651A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070266824A1 (en) * 2006-05-19 2007-11-22 Stein Joseph L Using a slag conditioner to beneficiate bag house dust from a steel making furnace
JP5737323B2 (ja) 2013-05-01 2015-06-17 住友電気工業株式会社 電気絶縁ケーブル
CN110964876A (zh) * 2018-09-29 2020-04-07 新疆八一钢铁股份有限公司 一种尾坯降低转炉合金消耗的方法
US20200199696A1 (en) * 2018-12-21 2020-06-25 Hickman, Williams & Company Foamy slag conditioner compound

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US3772000A (en) * 1971-11-23 1973-11-13 Columbia Gas Syst Method for converting solid ferrous metal to steel
JPS5328003A (en) * 1976-08-27 1978-03-15 Gamou Hideaki Dezincing method and mechanism for iron manufacture dust recovery process
US4119455A (en) * 1977-09-28 1978-10-10 Carad, Inc. Method of recovering iron-bearing by-product flue dust
US4304609A (en) * 1980-02-28 1981-12-08 Morris James B N Drill cuttings treatment apparatus and method
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US5218617A (en) * 1990-06-01 1993-06-08 Hylsa S.A. De C.V. Apparatus for feeding iron-bearing materials to metallurgical furnaces
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Also Published As

Publication number Publication date
CA2459112A1 (fr) 2003-01-30
US20070256516A1 (en) 2007-11-08
US20030015063A1 (en) 2003-01-23
MXPA04001602A (es) 2005-03-07
WO2003008651A1 (fr) 2003-01-30

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