CA2525559A1 - Method for recovering metallic elements, especially metallic chromium, from slag containing metal oxides in an electric-arc furnace - Google Patents
Method for recovering metallic elements, especially metallic chromium, from slag containing metal oxides in an electric-arc furnace Download PDFInfo
- Publication number
- CA2525559A1 CA2525559A1 CA 2525559 CA2525559A CA2525559A1 CA 2525559 A1 CA2525559 A1 CA 2525559A1 CA 2525559 CA2525559 CA 2525559 CA 2525559 A CA2525559 A CA 2525559A CA 2525559 A1 CA2525559 A1 CA 2525559A1
- Authority
- CA
- Canada
- Prior art keywords
- slag
- melt
- tapping
- charge
- chromium
- 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.)
- Granted
Links
- 239000002893 slag Substances 0.000 title claims abstract 28
- 229910052751 metal Inorganic materials 0.000 title claims abstract 17
- 238000000034 method Methods 0.000 title claims abstract 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract 5
- 229910052804 chromium Inorganic materials 0.000 title claims abstract 5
- 239000011651 chromium Substances 0.000 title claims abstract 5
- 238000010891 electric arc Methods 0.000 title claims abstract 4
- 229910044991 metal oxide Inorganic materials 0.000 title 1
- 150000004706 metal oxides Chemical class 0.000 title 1
- 239000002184 metal Substances 0.000 claims abstract 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract 7
- 238000002844 melting Methods 0.000 claims abstract 5
- 230000008018 melting Effects 0.000 claims abstract 5
- 238000005272 metallurgy Methods 0.000 claims abstract 4
- UOUJSJZBMCDAEU-UHFFFAOYSA-N chromium(3+);oxygen(2-) Chemical class [O-2].[O-2].[O-2].[Cr+3].[Cr+3] UOUJSJZBMCDAEU-UHFFFAOYSA-N 0.000 claims abstract 3
- 238000010079 rubber tapping Methods 0.000 claims 10
- 239000000155 melt Substances 0.000 claims 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 4
- 229910052799 carbon Inorganic materials 0.000 claims 4
- 229910052710 silicon Inorganic materials 0.000 claims 4
- 239000010703 silicon Substances 0.000 claims 4
- 229910052782 aluminium Inorganic materials 0.000 claims 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims 2
- 229910000423 chromium oxide Inorganic materials 0.000 claims 2
- 238000000926 separation method Methods 0.000 claims 2
- 238000005275 alloying Methods 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 239000011261 inert gas Substances 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 238000010309 melting process Methods 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 239000003923 scrap metal Substances 0.000 abstract 1
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
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/32—Obtaining chromium
-
- 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
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
-
- 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
- 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
-
- 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
- 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"
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a method for recovering metallic elements, especially metallic chromium, from slag containing oxides, especially chromium oxides, in an electric-arc furnace. According to said method, the slag is not reduced in a separate step after melting, but the following steps are carried out: a charge is introduced into the electric-arc furnace, and melted, forming a molten metal and slag; said molten metal is tapped off, leaving the unreduced slag in the furnace vessel; a further charge of scrap metal including reducing agents for the slag is added; the slag is reduced during the melting of said charge; and the slag and the molten metal are then tapped off. The inventive method can also be used in ladle metallurgy or converter metallurgy.
Claims (7)
1. Method for recovering metallic elements, especially metallic chromium, from stags that contain oxides, especially chromium oxides, in an electric arc furnace, with the following steps:
(a) introduction of a charge into the arc furnace;
(b) meltdown of the charge to produce a metal melt and slag;
(c) tapping of the melt while leaving the unreduced slag in the furnace vessel;
(d) introduction of another charge that contains scrap and reducing agents for the slag, such as carbon and/or silicon and/or aluminum;
(e) meltdown and direct reduction of the slag, especially direct reduction of chromium oxide, by the reducing agents in the charge during the melting process;
(g) tapping of the melt and the reduced slag.
(a) introduction of a charge into the arc furnace;
(b) meltdown of the charge to produce a metal melt and slag;
(c) tapping of the melt while leaving the unreduced slag in the furnace vessel;
(d) introduction of another charge that contains scrap and reducing agents for the slag, such as carbon and/or silicon and/or aluminum;
(e) meltdown and direct reduction of the slag, especially direct reduction of chromium oxide, by the reducing agents in the charge during the melting process;
(g) tapping of the melt and the reduced slag.
2. Method in accordance with Claim 1, characterized by -- the melting down of a buildup melt at the beginning of a melting campaign;
-- a partial tapping of the melt in step (c) while leaving metal bottoms in the furnace vessel;
-- the charging of another charge onto the remaining metal bottoms and the slag;
-- a partial tapping of the metal melt after the meltdown of the charge and the reduction of the slag; and -- repetition of the steps of charging, melting, and slag reduction for each melt of the campaign or termination by total tapping of a separation melt together with the metal bottoms.
-- a partial tapping of the melt in step (c) while leaving metal bottoms in the furnace vessel;
-- the charging of another charge onto the remaining metal bottoms and the slag;
-- a partial tapping of the metal melt after the meltdown of the charge and the reduction of the slag; and -- repetition of the steps of charging, melting, and slag reduction for each melt of the campaign or termination by total tapping of a separation melt together with the metal bottoms.
3. Method in accordance with Claim 1 or Claim 2, characterized by the fact that the reducing agents carbon and/or silicon and/or aluminum are charged in the form of alloying materials with a high carbon and silicon content.
4. Method in accordance with any of Claims 1 to 3, characterized by the fact that residual dusts are charged as reducing agents for the slag, especially a chromium-containing slag.
5. Method in accordance with any of Claims 1 to 4, characterized by the fact that thorough mixing is carried out by means of inert gases, which are introduced through bottom nozzles and/or side nozzles in the arc furnace and/or through a top lance.
6. Method for recovering metallic elements, especially metallic chromium, from slags that contain oxides, especially chromium oxides, in ladle metallurgy or converter metallurgy, with the following steps:
(a) introduction of a first metal melt with slag into a ladle or a converter;
(b) after the treatment of the melt, especially with oxygen, tapping of the melt while leaving the unreduced slag in the ladle or converter;
(c) introduction of another melt together with reducing agents for the slag, such as carbon and/or silicon and/or aluminum;
(d) thorough mixing of the melt with the slag, resulting in direct reduction of the slag, especially chromium oxide, by the reducing agents;
(g) tapping of the melt and the reduced slag.
(a) introduction of a first metal melt with slag into a ladle or a converter;
(b) after the treatment of the melt, especially with oxygen, tapping of the melt while leaving the unreduced slag in the ladle or converter;
(c) introduction of another melt together with reducing agents for the slag, such as carbon and/or silicon and/or aluminum;
(d) thorough mixing of the melt with the slag, resulting in direct reduction of the slag, especially chromium oxide, by the reducing agents;
(g) tapping of the melt and the reduced slag.
7. Method in accordance with Claim 6, characterized by -- a partial tapping of the melt in step (b) while leaving metal bottoms in the ladle;
-- the charging of another melt onto the remaining metal bottoms and the slag;
-- a partial tapping of the metal melt in step (g) after reduction of the slag;
-- repetition of the steps of charging and of slag reduction for each melt of the campaign or termination by total tapping of a separation melt together with the metal bottoms.
-- the charging of another melt onto the remaining metal bottoms and the slag;
-- a partial tapping of the metal melt in step (g) after reduction of the slag;
-- repetition of the steps of charging and of slag reduction for each melt of the campaign or termination by total tapping of a separation melt together with the metal bottoms.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003123507 DE10323507A1 (en) | 2003-05-24 | 2003-05-24 | Process for the recovery of metallic elements, in particular metallic chromium, from slags containing metal oxide in an electric arc furnace |
| DE10323507.8 | 2003-05-24 | ||
| PCT/EP2004/004313 WO2004104233A1 (en) | 2003-05-24 | 2004-04-23 | Method for recovering metallic elements, especially metallic chromium, from slag containing metal oxides in an electric-arc furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2525559A1 true CA2525559A1 (en) | 2004-12-02 |
| CA2525559C CA2525559C (en) | 2011-07-26 |
Family
ID=33441237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2525559 Expired - Fee Related CA2525559C (en) | 2003-05-24 | 2004-04-23 | Method for recovering metallic elements, especially metallic chromium, from slag containing metal oxides in an electric-arc furnace |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US20060196308A1 (en) |
| EP (1) | EP1627085B1 (en) |
| JP (1) | JP4912880B2 (en) |
| KR (1) | KR20060012288A (en) |
| CN (1) | CN100350057C (en) |
| CA (1) | CA2525559C (en) |
| DE (2) | DE10323507A1 (en) |
| ES (1) | ES2277253T3 (en) |
| RU (1) | RU2352672C2 (en) |
| TW (1) | TW200502404A (en) |
| UA (1) | UA82239C2 (en) |
| WO (1) | WO2004104233A1 (en) |
| ZA (1) | ZA200508277B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006052181A1 (en) * | 2006-11-02 | 2008-05-08 | Sms Demag Ag | A process for the continuous or discontinuous recovery of a metal or metals from a slag containing the metal or compound of the metal |
| EP2053137A1 (en) * | 2007-10-19 | 2009-04-29 | Paul Wurth S.A. | Recovery of waste containing copper and other valuable metals |
| JP5326475B2 (en) * | 2008-10-07 | 2013-10-30 | 新日鐵住金株式会社 | Method for recovering chromium from chromium-containing slag |
| JP5455193B2 (en) * | 2009-04-30 | 2014-03-26 | 日新製鋼株式会社 | Stainless steel manufacturing method |
| WO2011045755A1 (en) * | 2009-10-13 | 2011-04-21 | Petrus Hendrik Ferreira Bouwer | Ferrochrome alloy production |
| JP2013124417A (en) * | 2011-12-16 | 2013-06-24 | Nippon Steel & Sumitomo Metal Corp | METHOD FOR TREATING Cr-CONTAINING SLAG |
| CN102864311B (en) * | 2012-09-21 | 2014-11-26 | 承德建龙特殊钢有限公司 | Recovery method of chromium in high chromium-content slag in steel making-LF (ladle furnace) working procedure |
| CN104087709B (en) * | 2014-07-18 | 2016-08-24 | 承德建龙特殊钢有限公司 | A kind of method of melting and reducing height chromium slag in induction furnace |
| CN104087704B (en) * | 2014-07-18 | 2016-08-24 | 承德建龙特殊钢有限公司 | A kind of method that melting and reducing vanadium extraction waste carries out pneumatic steelmaking |
| CN104789736B (en) * | 2015-05-18 | 2017-01-11 | 安徽富凯特材有限公司 | Method for reducing chromium element in electric arc furnace slag |
| CN105670667B (en) * | 2016-01-19 | 2019-05-07 | 青岛理工大学 | Method for synchronously treating chromium slag and chlorine-free plastic |
| WO2024127339A1 (en) | 2022-12-16 | 2024-06-20 | Danieli & C. Officine Meccaniche S.P.A. | Process and plant for slag treatment |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT381583B (en) * | 1984-06-01 | 1986-11-10 | Voest Alpine Ag | TILTABLE METALLURGICAL TUBE |
| DE3444962A1 (en) * | 1984-12-10 | 1986-06-12 | Klöckner-Humboldt-Deutz AG, 5000 Köln | METHOD AND DEVICE FOR THE REDUCING TREATMENT OF MELT-LIQUID METALS AND / OR THEIR SLAGS |
| JPH0196322A (en) * | 1987-10-08 | 1989-04-14 | Nkk Corp | Ladle refining method |
| DE4108687A1 (en) * | 1991-03-16 | 1992-11-05 | Metallgesellschaft Ag | METHOD FOR REDUCING NE-METAL OXIDES IN SLAGS |
| JPH06200311A (en) * | 1993-01-05 | 1994-07-19 | Nkk Corp | Method for dephosphorizing molten iron |
| 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 |
| JPH09157724A (en) * | 1995-12-01 | 1997-06-17 | Nippon Steel Corp | Production of stainless steel using scrap |
| DE19643459A1 (en) * | 1996-10-10 | 1998-04-16 | Mannesmann Ag | Process for depleting high-melting materials |
| DE19728102C2 (en) * | 1997-07-02 | 1999-08-05 | Schloemann Siemag Ag | Method and device for the production of steels with high Cr content and / or ferro alloys |
| NO308418B1 (en) * | 1998-12-09 | 2000-09-11 | Elkem Materials | Process for the production of stainless steel |
| AT407644B (en) * | 1999-06-08 | 2001-05-25 | Voest Alpine Ind Anlagen | METHOD FOR SLAG CONDITIONING AND APPARATUS THEREFOR |
| US6679931B1 (en) * | 1999-06-23 | 2004-01-20 | Sms Demag Ag | Method for recovering metallic chromium from slag containing chromium oxide |
| JP4189112B2 (en) * | 2000-02-24 | 2008-12-03 | 新日本製鐵株式会社 | Processing method for slag refining stainless steel |
| KR100819126B1 (en) * | 2000-10-18 | 2008-04-02 | 에스엠에스 데마그 악티엔게젤샤프트 | Method for producing stainless steels, in particular high-grade steels containing chromium and chromium-nickel |
| JP2002256323A (en) * | 2001-02-27 | 2002-09-11 | Nippon Steel Corp | Method for reforming roughly decarburized slag in molten stainless steel |
-
2003
- 2003-05-24 DE DE2003123507 patent/DE10323507A1/en not_active Withdrawn
-
2004
- 2004-04-23 ES ES04729097T patent/ES2277253T3/en not_active Expired - Lifetime
- 2004-04-23 UA UAA200512438A patent/UA82239C2/en unknown
- 2004-04-23 RU RU2005140569A patent/RU2352672C2/en not_active IP Right Cessation
- 2004-04-23 CN CNB2004800142153A patent/CN100350057C/en not_active Expired - Fee Related
- 2004-04-23 US US10/556,496 patent/US20060196308A1/en not_active Abandoned
- 2004-04-23 DE DE200450002628 patent/DE502004002628D1/en not_active Expired - Lifetime
- 2004-04-23 JP JP2006529705A patent/JP4912880B2/en not_active Expired - Fee Related
- 2004-04-23 EP EP20040729097 patent/EP1627085B1/en not_active Expired - Lifetime
- 2004-04-23 KR KR1020057021614A patent/KR20060012288A/en not_active Application Discontinuation
- 2004-04-23 CA CA 2525559 patent/CA2525559C/en not_active Expired - Fee Related
- 2004-04-23 WO PCT/EP2004/004313 patent/WO2004104233A1/en active IP Right Grant
- 2004-04-26 TW TW093111577A patent/TW200502404A/en unknown
-
2005
- 2005-10-13 ZA ZA2005/08277A patent/ZA200508277B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| UA82239C2 (en) | 2008-03-25 |
| KR20060012288A (en) | 2006-02-07 |
| ZA200508277B (en) | 2006-12-27 |
| CN1795276A (en) | 2006-06-28 |
| JP4912880B2 (en) | 2012-04-11 |
| DE10323507A1 (en) | 2004-12-09 |
| JP2007502369A (en) | 2007-02-08 |
| CN100350057C (en) | 2007-11-21 |
| ES2277253T3 (en) | 2007-07-01 |
| RU2352672C2 (en) | 2009-04-20 |
| RU2005140569A (en) | 2006-05-10 |
| TW200502404A (en) | 2005-01-16 |
| DE502004002628D1 (en) | 2007-02-22 |
| US20060196308A1 (en) | 2006-09-07 |
| WO2004104233A1 (en) | 2004-12-02 |
| CA2525559C (en) | 2011-07-26 |
| EP1627085A1 (en) | 2006-02-22 |
| EP1627085B1 (en) | 2007-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20080156144A1 (en) | Method for reducing to metallic chromium the chromium oxide in slag from stainless steel processing | |
| US6238453B1 (en) | Producing stainless steels in parallel operated vessels | |
| JP2008531840A (en) | Method and melting apparatus for producing high manganese low carbon steel | |
| ZA200508277B (en) | Method for recovering metallic elements especially metallic chromium from slag containing metal oxides in an electric-arc furnace | |
| JP2006206957A (en) | Method for recovering manganese from slag produced when manufacturing manganese-based ferroalloy | |
| US3615348A (en) | Stainless steel melting practice | |
| US7094271B2 (en) | Method for producing stainless steels, in particular high-grade steels containing chromium and chromium-nickel | |
| EP2692873A1 (en) | Method for manufacturing stainless steel | |
| JP2947063B2 (en) | Stainless steel manufacturing method | |
| CA3157144A1 (en) | Method for producing molten steel | |
| JP3158912B2 (en) | Stainless steel refining method | |
| JP3063537B2 (en) | Stainless steel manufacturing method | |
| JPH0987722A (en) | Method for refining molten crude stainless steel | |
| JP3771634B2 (en) | Effective utilization of chromium oxide-containing dust | |
| RU2148102C1 (en) | Method of preparing ferromanganese | |
| JP3375528B2 (en) | Recovery and reuse of ingots on converter mouth | |
| RU2398889C1 (en) | Procedure for melting rail steel | |
| JPH0959708A (en) | Method for efficently decarburization-blowing stainless steel | |
| RU2102497C1 (en) | Method of melting vanadium-containing steel in electric arc furnace | |
| Aydemir | Use of aluminium dross for slag treatment in secondary steelmaking to decrease amount of reducible oxides in ladle furnace | |
| JP2002371313A (en) | Method for smelting molten stainless steel | |
| JPS62167808A (en) | Production of molten chromium iron | |
| JP2001294926A (en) | Refining method using chromium oxide containing slag | |
| JPH0762413A (en) | Production of stainless steel | |
| JPH029643B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20150423 |