CN1954086A - 由含铬冶金渣中减少铬的方法 - Google Patents
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- 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
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- 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
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- 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
- C21C5/36—Processes yielding slags of special composition
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- 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
- C21C7/0025—Adding carbon material
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- 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
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/32—Obtaining chromium
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- 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
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- 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
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- 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
- C21C5/527—Charging of the electric furnace
- C21C2005/5276—Charging of the electric furnace with liquid or solid rest, e.g. pool, "sumpf"
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- 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
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- 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
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- Metallurgy (AREA)
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
本发明涉及一种用于从冶金渣中减少铬含量的方法，该方法中将渣以液态加到铁熔池中，并且通过含C量为2－4重量％的铁水池实现减少Cr，其包括下列步骤：a)将Cr含量为2－20重量％的含Cr渣加到C含量低于1重量％的铁熔池中，随之b)使铁熔池的碳含量通过加入C－载体并同时输入能量而升高到约2－4重量％，c)在Cr减少后使Cr含量约为0.1重量％的液态渣出炉，d)在铁熔体中加入冷却剂，优选是废金属屑，使熔体的C含量降到小于1重量％，e)以液态卸出部分含Cr熔体，而其余的以液态保持在转炉中用于其后的熔体的处理。
Description
本发明涉及一种用于从冶金渣中减少铬含量的方法，该方法中将渣以液态加到铁熔池中，并且通过含C量为2-4重量％的铁熔池实现减少Cr。
在制备不锈钢时产生大量的渣，其Cr含量如此之高，以致减少其含量具有经济意义。同时也基于环保原因减少该渣中的Cr含量是长期所希望的。
在WO 01/055461中例如描述了一种方法，在该方法中，渣中的Cr含量是通过与含C的铁溶池反应而减少到约0.05-0.2重量％。
但在实际中实施该方法导致很大困难，这可能就是该方法之所以至今未应用的原因。
如上述专利申请所述，为减少Cr，铁熔池中的C含量至少需为3％。渣中的Cr含量为4-6重量％。
液态的含Cr渣应加到生铁池中。生铁是指C含量为约4重量％的铁。
上述发明的另一缺点在于，由渣中减少的铬存在于有高C含量的预合金中。该C含量必需在电炉中再经精炼排除，这对整个工艺会有不利影响。
在专利申请WO 01/055459A1中已指出，FeO含量大于5重量％的液态渣在加到生铁池中时会引发强烈反应。所以需要在液态的含FeO的渣加到铁池中前将铁池中的C含量降到小于0.5重量％。但当将氧化铬含量大于2重量％的含CrO渣加到有较高碳含量的铁熔池中时也出现类似反应。
本发明避免了所述方法的缺点。本发明通过下列方法步骤组合实现冶金渣中铬的减少：
a)将Cr含量为2-20重量％的含Cr渣加到C含量低于1重量％的铁熔池中，随之
b)使铁熔池的碳含量通过加入C载体并同时输入能量而升高到约2-4重量％，
c)在Cr减少后使Cr含量约为0.1重量％的液态渣出渣，
d)在铁熔体中加入冷却剂，优选是废金属屑，使熔体的C含量降到小于1重量％，优选降到小于0.5重量％，
e)以液态卸出部分含Cr熔体，而其余的以液态保持在转炉中用于其后的熔体的处理。
为实施本发明方法，底吹转炉是特别适用的，在该转炉中反应气体通过热空气射束补充燃烧。仅由于在此方法中在能量输入时的高效率就使所需碳量是如此小，以致该方法可经济地运行。
对本发明方法重要的是，Cr含量减少后的渣以高C含量从铁熔池分离出。仅少量残余渣保留在转炉中，该渣的Cr含量在其后的降低铁熔池中的C含量时再次稍许增加。但这时成渣的Cr量是如此小，以致其对Cr衡算几乎不起作用。此外，该渣保留在转炉中，Cr含量在其后配料中再次减少。
在铁熔体精炼时为冷却可使用例如非合金废屑，如在制备不锈钢制品时通常以30重量％应用。这情况下非合金废金属的优点是保持铁熔体中的Cr含量低，这导致为减少渣所需的处理时间较短。但由在处理废物时的残余物质产生的残渣或来自AOD转炉或铁水包除气装置的渣也随之熔化。
与现有技术相比，本发明方法有下列优点：
·为处理含Cr渣所需的铁熔池可由以前的熔体获得。
·在转炉中通过减少含Cr渣而形成的预合金具有低C含量，可呈液态加到电炉中。
·非合金废屑以低成本熔化，并导致电炉相应增加产量。
以一个实施例来详述本发明方法：
在100吨的电炉中制备Cr含量为18重量％和Ni含量为8重量％的钢。在按现有技术制备时，在电炉中熔化60吨的合金废屑、35吨的非合金废屑和15吨FeCr。在用铁-硅减少渣后，出炉100吨的含18重量％Cr、8重量％Ni和0.5重量％C的液态钢和10吨渣。该渣的Cr含量为5重量％，FeO含量为1.5重量％。
按本发明，该渣以液态加到转炉中，该转炉中有来自前次熔体的含0.5重量％C和3重量％Cr的20吨铁熔体。
该转炉以5000Nm/h的吹入速度经底部吹入氧和以25000Nm/h的热空气顶吹速度来运行，其中使热风浓集到含25重量％的O2。总计加入5吨粉状煤，该煤从底部喷嘴吹入。
为进行第一分步骤，即提高C含量和铁熔池的温度以及由渣中减少铬，需2吨煤。适宜的是在该第一分步骤中共同熔化在处理废物时产生的其量约占所生产的钢量的4重量％的渣和合金废屑。为此约需0.5吨煤。接着使其Cr含量约为0.1重量％的渣出炉。如果需要，该Cr含量可在出渣前通过加入4kg FeSi/吨渣而减少到约0.01重量％。
在含3重量％C和7重量％Cr的铁熔池中加入30吨非合金废屑。其熔化需3吨煤，其中2.5吨以粉状吹入，其余量由铁熔池提供，该铁熔池的C含量在熔化时由3重量％降到0.5重量％。
从处于转炉中的含3重量％Cr的预合金中出炉30吨，并以液态加到电炉中。其余的20吨保留在转炉中用于下次配料。
上述的量可在宽范围内变化。因此，例如还可将额外熔化的废屑量减少到约15吨。因此形成含7重量％Cr的预合金用于电炉中。但由此已大大提高了铁熔池中的Cr含量，导致用于从渣中减少Cr的时间延长。该工艺应如此进行，即在各分步骤中，铁熔池中的Cr含量均不超过10重量％。
本发明中也可通过加入相应的成渣剂材料来改变渣的组成，以使该渣可用于水泥生产中。
Claims (2)
1.一种从冶金渣中减少铬含量的方法，其中将所述渣以液态加到铁熔池中，并且通过C含量为2-4重量％的铁熔池实现减少Cr，所述方法的特征在于：
a)将Cr含量为2-20重量％的含Cr渣加到C含量低于1重量％的铁熔池中，随之
b)使铁熔池的碳含量通过加入C载体并同时输入能量而升高到约2-4重量％，
c)在Cr减少后使Cr含量约为0.1重量％的液态渣出炉，
d)在铁熔体中加入冷却剂，优选是废金属屑，使熔体的C含量降到小于1重量％，
e)以液态卸出部分含Cr熔体，而其余的以液态保持在转炉中用于其后的熔体的处理。
2.权利要求1的方法，其特征在于，加入冷却剂用于使熔体的C含量降低到小于0.5重量％。
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT3672004 | 2004-05-18 | ||
| ATGM367/2004 | 2004-05-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1954086A true CN1954086A (zh) | 2007-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800158175A Pending CN1954086A (zh) | 2004-05-18 | 2005-05-18 | 由含铬冶金渣中减少铬的方法 |
Country Status (17)
| Country | Link |
|---|---|
| US (1) | US7641713B2 (zh) |
| EP (1) | EP1747297B1 (zh) |
| JP (1) | JP4829225B2 (zh) |
| CN (1) | CN1954086A (zh) |
| AT (1) | ATE378429T1 (zh) |
| AU (1) | AU2005245678B2 (zh) |
| BR (1) | BRPI0511154B1 (zh) |
| CA (1) | CA2563338A1 (zh) |
| DE (1) | DE502005001988D1 (zh) |
| ES (1) | ES2297704T3 (zh) |
| MX (1) | MXPA06012456A (zh) |
| PL (1) | PL1747297T3 (zh) |
| PT (1) | PT1747297E (zh) |
| RU (1) | RU2360008C2 (zh) |
| TW (1) | TWI300444B (zh) |
| WO (1) | WO2005113840A1 (zh) |
| ZA (1) | ZA200608814B (zh) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483312A (zh) * | 2016-01-15 | 2016-04-13 | 山西太钢不锈钢股份有限公司 | 一种不锈钢不还原留渣的方法 |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103121802B (zh) * | 2011-11-18 | 2014-11-05 | 中国科学院过程工程研究所 | 一种利用亚熔盐工艺产出铬渣制备氯氧镁水泥的方法 |
| CN103602781B (zh) * | 2013-11-17 | 2015-03-25 | 山西太钢不锈钢股份有限公司 | 一种降低不锈钢冶炼过程电弧炉渣中氧化铬的方法 |
| JP6451462B2 (ja) * | 2015-04-01 | 2019-01-16 | 新日鐵住金株式会社 | クロム含有スラグからのクロム回収方法 |
| AT523447B1 (de) * | 2020-02-02 | 2021-08-15 | Alfred Edlinger Dipl Ing | Verfahren zum Abtrennen von Phosphor und/oder Phosphorverbindungen aus eisen(oxid)haltigen Phosphor- und/oder Phosphatträgern |
| WO2021152386A1 (de) | 2020-02-02 | 2021-08-05 | Radmat Ag | Verfahren zum abtrennen von phosphor und/oder phosphorverbindungen aus eisen(oxid)haltigen phosphor- und/oder phosphatträgern |
| CN112813221B (zh) * | 2020-12-30 | 2023-02-03 | 河钢股份有限公司承德分公司 | 一种高硅含钒铁水转炉提钒的方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS61166910A (ja) * | 1985-01-18 | 1986-07-28 | Nippon Steel Corp | クロム含有合金の製造方法 |
| JP2964861B2 (ja) * | 1993-06-17 | 1999-10-18 | 住友金属工業株式会社 | ステンレス鋼の製造方法 |
| KR0179394B1 (ko) * | 1994-06-06 | 1999-02-18 | 도자끼 시노부 | 함Cr용강의 탈탄 정련방법 |
| ZA963234B (en) * | 1995-05-02 | 1996-07-29 | Holderbank Financ Glarus | Process for the production of hydraulic binders and/or alloys such as e g ferrochromium of ferrovanadium |
| HRP970303B1 (en) | 1996-06-05 | 2002-06-30 | Holderbank Financ Glarus | Method for making pozzolans, synthetic blast-furnance slag, belite or alite clinkers, and pig-iron alloys, from oxidic slag and a device for implementing this method |
| US6332910B1 (en) | 1997-09-15 | 2001-12-25 | Holderbank Financiere Glarus Ag | Process for working up steel slags and iron carriers for obtaining pig iron and environmentally safe slags |
| JP2000319047A (ja) | 1999-03-10 | 2000-11-21 | Kawasaki Steel Corp | ステンレス鋼精錬スラグの改質処理方法 |
| AT407263B (de) | 1999-04-22 | 2001-02-26 | Holderbank Financ Glarus | Verfahren zum aufarbeiten von stahlschlacken |
| BR0011949A (pt) * | 1999-06-23 | 2002-03-26 | Sms Demag Ag | Processo para a recuperação de cromo metálico a partir de escórias contendo óxido de cromo |
| KR100603165B1 (ko) | 2000-01-28 | 2006-07-24 | 홀심 리미티드 | 액체 슬래그로부터 크롬, 니켈, 또는 크롬 및 니켈을 제거하는 방법 |
| RU2238331C2 (ru) * | 2000-01-28 | 2004-10-20 | Хольцим Лтд. | Способ обработки шлаков или смесей шлаков |
| 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 |
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- 2005-05-18 US US11/579,102 patent/US7641713B2/en not_active Expired - Fee Related
- 2005-05-18 RU RU2006144836A patent/RU2360008C2/ru active
- 2005-05-18 CN CNA2005800158175A patent/CN1954086A/zh active Pending
- 2005-05-18 JP JP2007517483A patent/JP4829225B2/ja not_active Expired - Fee Related
- 2005-05-18 AU AU2005245678A patent/AU2005245678B2/en not_active Ceased
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- 2005-05-18 MX MXPA06012456A patent/MXPA06012456A/es active IP Right Grant
- 2005-05-18 WO PCT/IB2005/001342 patent/WO2005113840A1/de active IP Right Grant
- 2005-05-18 BR BRPI0511154-4B1A patent/BRPI0511154B1/pt not_active IP Right Cessation
- 2005-05-18 PT PT05738346T patent/PT1747297E/pt unknown
- 2005-05-18 EP EP20050738346 patent/EP1747297B1/de not_active Not-in-force
- 2005-05-18 PL PL05738346T patent/PL1747297T3/pl unknown
- 2005-05-18 ES ES05738346T patent/ES2297704T3/es active Active
- 2005-05-18 TW TW94116040A patent/TWI300444B/zh not_active IP Right Cessation
- 2005-05-18 DE DE200550001988 patent/DE502005001988D1/de active Active
- 2005-05-18 CA CA 2563338 patent/CA2563338A1/en not_active Abandoned
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483312A (zh) * | 2016-01-15 | 2016-04-13 | 山西太钢不锈钢股份有限公司 | 一种不锈钢不还原留渣的方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| PL1747297T3 (pl) | 2008-04-30 |
| JP2007538156A (ja) | 2007-12-27 |
| ES2297704T3 (es) | 2008-05-01 |
| US7641713B2 (en) | 2010-01-05 |
| TW200540279A (en) | 2005-12-16 |
| RU2360008C2 (ru) | 2009-06-27 |
| EP1747297B1 (de) | 2007-11-14 |
| DE502005001988D1 (de) | 2007-12-27 |
| ZA200608814B (en) | 2008-05-28 |
| WO2005113840A1 (de) | 2005-12-01 |
| AU2005245678A1 (en) | 2005-12-01 |
| BRPI0511154A (pt) | 2007-12-04 |
| MXPA06012456A (es) | 2007-03-30 |
| TWI300444B (en) | 2008-09-01 |
| JP4829225B2 (ja) | 2011-12-07 |
| AU2005245678B2 (en) | 2010-09-30 |
| RU2006144836A (ru) | 2008-07-10 |
| US20070227307A1 (en) | 2007-10-04 |
| EP1747297A1 (de) | 2007-01-31 |
| BRPI0511154B1 (pt) | 2014-02-18 |
| ATE378429T1 (de) | 2007-11-15 |
| CA2563338A1 (en) | 2005-12-01 |
| PT1747297E (pt) | 2008-02-13 |
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