WO2020178480A1 - Fusion combinée de scories fondues et de résidus à partir de travaux d'acier inoxydable et de ferrochrome - Google Patents

Fusion combinée de scories fondues et de résidus à partir de travaux d'acier inoxydable et de ferrochrome Download PDF

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Publication number
WO2020178480A1
WO2020178480A1 PCT/FI2020/050129 FI2020050129W WO2020178480A1 WO 2020178480 A1 WO2020178480 A1 WO 2020178480A1 FI 2020050129 W FI2020050129 W FI 2020050129W WO 2020178480 A1 WO2020178480 A1 WO 2020178480A1
Authority
WO
WIPO (PCT)
Prior art keywords
metal
slag
stainless steel
ferrochromium
converter
Prior art date
Application number
PCT/FI2020/050129
Other languages
English (en)
Inventor
Kimmo VALLO
Timo PARVIAINEN
Original Assignee
Outokumpu Oyj
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 Outokumpu Oyj filed Critical Outokumpu Oyj
Priority to FI20217132A priority Critical patent/FI20217132A1/en
Priority to SE2150998A priority patent/SE2150998A1/en
Priority to CA3129671A priority patent/CA3129671A1/fr
Priority to CN202080012085.9A priority patent/CN113366129A/zh
Priority to JP2021551575A priority patent/JP2022523397A/ja
Priority to KR1020217025564A priority patent/KR20210134310A/ko
Publication of WO2020178480A1 publication Critical patent/WO2020178480A1/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
    • 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
    • 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
    • C04B5/00—Treatment of  metallurgical  slag ; Artificial stone from molten  metallurgical  slag 
    • C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
    • 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
    • C21B3/06—Treatment of liquid slag
    • 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
    • C21C5/005—Manufacture of stainless steel
    • 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
    • C21C5/5264—Manufacture of alloyed steels including ferro-alloys
    • 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
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • C22B7/04—Working-up 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
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/20—Arc remelting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • 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
    • C21C2200/00—Recycling of waste material
    • 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

  • the present invention relates to a method for smelting metal- and metal oxide- containing side streams, such as slags and wastes generated at stainless steel and ferrochromium works.
  • the invented processing method is a smelting process for all side streams and residuals from the mentioned fields of industry.
  • the streams are treated mainly in liquid phase for energy saving.
  • European patent 1 641 946 B is disclosed a method for producing a metal alloy melt in a number of subsequent steps, whereby dust and slags are recycled into the process in order to recover Cr and Ni.
  • side streams from stainless steel production and ferrochromium production are treated separately in various designated processes. Slags are treated in cooled-down form in metal recovery plants, and metal oxide wastes, eg. bag filter dusts, mill scales and sludges are commonly treated in separate waste smelting plants or landfilled. Some amounts of metal oxides are always present in side stream outputs, but it is generally not profitable to melt these streams again to improve the reduction result. Residual metals from the slag streams are traditionally recovered by means of mechanical metal recovery equipment, and some metals remain in slags after treatment.
  • stainless steel slag is a slag generated in stainless steel production in scrap melting, AOD/VOD-converting and ladle treatment processes.
  • ferrochromium slag is a slag generated in ferrochrome smelting operations from chromite ore.
  • Typical composition range of ferrochrome slag is presented in table 2.
  • metal oxide wastes such as filter dusts, mill scales and sludges are melted together with liquid slags from stainless steel and ferrochromium production in an electric arc furnace or a converter.
  • a significant feature is to supply slag feeds in liquid phase, thus significantly decreasing the energy requirement for melting and reduction.
  • Slag streams relevant for this invention are all slags from stainless steel and ferrochromium production vessels (electric arc furnaces, converters, ladle treatments) and also other metal- or metal oxide-containing side streams from the mentioned metal production facilities - eg. used refractories.
  • the metal oxide- containing side streams relevant for this innovation are metal oxide-, sulphate- or hydroxide-containing gas cleaning dusts, scales and sludges from stainless steel and ferrochromium production (e.g. from smelting, melting, grinding, hot and cold rolling and acid regeneration facilities).
  • the invented processing method combines the smelting of metal oxide wastes with molten slag feed. Hence, a separate processing unit is not needed for metal oxide waste streams. This combined process also makes traditional mechanical separation for metal remains in slag unnecessary.
  • the current processing method produces pure metal alloy and metal-free slag as output.
  • Smelting energy input for melting streams and reduction of metal oxides
  • AC or DC electric arc furnaces can be carried out in AC or DC electric arc furnaces.
  • chemical energy can be used if a converter vessel is preferred.
  • reductants are coke, anthracite, graphite, methane, plastic and rubber. Also other carbon sources may be employed. Further, silicon and aluminium based reductants can be used.
  • Dusts in this context may also include ZnO.
  • a stream for use in the method according to the invention may involve waste steel plant dust and particulate matter of a dimension up to 100 mm.
  • the optimum slag basicity for Cr 2 0 3 reduction is achieved by mixing molten stainless steel slags (acting as a lime source) and ferrochromium slags. Hence, additional lime feeding and melting is not needed, which saves natural resources as well as energy.
  • a method for producing a ferrochromium alloy which preferably contains Cr, Ni and Mo, in a number of successive and synchronized method steps:
  • Molten slags are fed into an electric arc furnace or a
  • slag may be used further in the metal industry and produced slag may be used further in various slag product applications, mainly in earthworks.
  • Fig. 1 shows the principle for the combined treatment of metal- and metal oxide- containing residuals from stainless steel and ferrochromium facilities.
  • Fig. 1 illustrates how molten slags are transported from metal production facilities to a smelting facility using vessels.
  • Liquid slags are fed into a smelting furnace in a phase, which equals to slag production volume.
  • solid slags and solid metal oxide waste streams are fed into the furnace from silos via feeding chutes.
  • Extra energy is provided by electrodes to achieve the desired reduction temperature (1500 °C - 1600 °C for metal and 1600 °C - 1700 °C for slag).
  • Carbon-based reductant is added to reduce metal oxides from the slag layer into the metal heel.
  • the settlement speed of reduced metal droplets or other metallurgical parameters can be modified by slag additives - e.g. quartz and lime.
  • the furnace After reduction and settlement of the produced metal alloy, the furnace is tapped.
  • the metal alloy is either used as liquid in stainless steel production or granulated into metal granules for usage in metal industries.
  • Produced slag from the smelting furnace is granulated by air, water or gas into slag products for different applications. Also air cooling may be used to produce slag aggregates.
  • the produced slag is metal free and further metal separation is not needed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Ceramic Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Structural Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

La présente invention concerne un procédé de fusion de flux secondaires contenant des métaux et des oxydes métalliques, tels que des scories et des déchets générés dans des travaux d'acier inoxydable et de ferrochrome. Le procédé de traitement de l'invention est un procédé de fusion pour tous les flux secondaires et les résidus des domaines de l'industrie mentionnés. Les flux sont traités principalement en phase liquide pour économiser de l'énergie.
PCT/FI2020/050129 2019-03-01 2020-02-28 Fusion combinée de scories fondues et de résidus à partir de travaux d'acier inoxydable et de ferrochrome WO2020178480A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FI20217132A FI20217132A1 (en) 2019-03-01 2020-02-28 Combined melting of smelting slag and residues from stainless steel and ferrochrome production
SE2150998A SE2150998A1 (en) 2019-03-01 2020-02-28 Combined smelting of molten slags and residuals from stainless steel and ferrochromium works
CA3129671A CA3129671A1 (fr) 2019-03-01 2020-02-28 Fusion combinee de scories fondues et de residus a partir de travaux d'acier inoxydable et de ferrochrome
CN202080012085.9A CN113366129A (zh) 2019-03-01 2020-02-28 来自不锈钢和铁铬作业的熔化炉渣和残余物的混合冶炼
JP2021551575A JP2022523397A (ja) 2019-03-01 2020-02-28 ステンレス鋼及びフェロクロム工場からの溶融スラグ及び残留物の組み合わせ溶解
KR1020217025564A KR20210134310A (ko) 2019-03-01 2020-02-28 스테인리스 강 및 페로크롬 가공으로부터의 용융 슬래그 및 잔류물의 조합된 제련

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20195153 2019-03-01
FI20195153A FI20195153A1 (en) 2019-03-01 2019-03-01 Utilization of metal and metal oxide-containing sidestreams using arc furnace technology

Publications (1)

Publication Number Publication Date
WO2020178480A1 true WO2020178480A1 (fr) 2020-09-10

Family

ID=72337367

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2020/050129 WO2020178480A1 (fr) 2019-03-01 2020-02-28 Fusion combinée de scories fondues et de résidus à partir de travaux d'acier inoxydable et de ferrochrome

Country Status (8)

Country Link
JP (1) JP2022523397A (fr)
KR (1) KR20210134310A (fr)
CN (1) CN113366129A (fr)
CA (1) CA3129671A1 (fr)
FI (2) FI20195153A1 (fr)
SE (1) SE2150998A1 (fr)
TW (1) TW202033771A (fr)
WO (1) WO2020178480A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113265534B (zh) * 2021-04-14 2023-03-31 嘉峪关宏电铁合金有限责任公司 一种低品铬铁渣再利用生产工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5882375A (en) * 1995-05-02 1999-03-16 "Holderbank" Financiere Glarus Ag Process for the production of hydraulic binders and/or alloys, such as for examples, ferrochromium or ferrovanadium
US6010553A (en) * 1996-01-17 2000-01-04 "Holderbank" Financiere Glarus Ag Process for producing pig iron, nonferrous heavy metal alloys, FECR and synthetic blast furnace slags using metal-oxide-containing waste incineration residues or slags
KR101176658B1 (ko) * 2003-06-25 2012-08-23 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 합금된 용융 금속을 제조하기 위한 방법 및 이와 관련된제조 설비
CN107058677A (zh) * 2017-05-22 2017-08-18 山西太钢不锈钢股份有限公司 一种利用不锈钢电炉渣的冶炼方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT407263B (de) * 1999-04-22 2001-02-26 Holderbank Financ Glarus Verfahren zum aufarbeiten von stahlschlacken
JP2001316712A (ja) * 2000-05-02 2001-11-16 Nippon Steel Corp 含クロム滓からのクロム回収方法
KR20050109763A (ko) * 2004-05-17 2005-11-22 주식회사 포스코 스테인레스 제강 슬래그의 유가금속 회수방법
KR100793591B1 (ko) * 2006-12-28 2008-01-14 주식회사 포스코 산화크롬 함유 슬래그로부터의 크롬 금속 환원 방법
CN108676942A (zh) * 2018-05-18 2018-10-19 廖辉明 一种含铁和或锌铅铜锡等物料与熔融钢渣协同处理回收方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5882375A (en) * 1995-05-02 1999-03-16 "Holderbank" Financiere Glarus Ag Process for the production of hydraulic binders and/or alloys, such as for examples, ferrochromium or ferrovanadium
US6010553A (en) * 1996-01-17 2000-01-04 "Holderbank" Financiere Glarus Ag Process for producing pig iron, nonferrous heavy metal alloys, FECR and synthetic blast furnace slags using metal-oxide-containing waste incineration residues or slags
KR101176658B1 (ko) * 2003-06-25 2012-08-23 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 합금된 용융 금속을 제조하기 위한 방법 및 이와 관련된제조 설비
CN107058677A (zh) * 2017-05-22 2017-08-18 山西太钢不锈钢股份有限公司 一种利用不锈钢电炉渣的冶炼方法

Also Published As

Publication number Publication date
FI20195153A1 (en) 2020-09-02
KR20210134310A (ko) 2021-11-09
CA3129671A1 (fr) 2020-09-10
FI20217132A1 (en) 2021-08-26
CN113366129A (zh) 2021-09-07
SE2150998A1 (en) 2021-08-12
TW202033771A (zh) 2020-09-16
JP2022523397A (ja) 2022-04-22

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