ZA200508277B - 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
- ZA200508277B ZA200508277B ZA2005/08277A ZA200508277A ZA200508277B ZA 200508277 B ZA200508277 B ZA 200508277B ZA 2005/08277 A ZA2005/08277 A ZA 2005/08277A ZA 200508277 A ZA200508277 A ZA 200508277A ZA 200508277 B ZA200508277 B ZA 200508277B
- Authority
- ZA
- South Africa
- Prior art keywords
- slag
- melt
- tapping
- bottoms
- metal
- Prior art date
Links
- 239000002893 slag Substances 0.000 title claims description 61
- 238000000034 method Methods 0.000 title claims description 49
- 229910052751 metal Inorganic materials 0.000 title claims description 36
- 239000011651 chromium Substances 0.000 title claims description 24
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 22
- 229910052804 chromium Inorganic materials 0.000 title claims description 22
- 238000010891 electric arc Methods 0.000 title claims description 10
- 229910044991 metal oxide Inorganic materials 0.000 title description 2
- 150000004706 metal oxides Chemical class 0.000 title description 2
- 239000002184 metal Substances 0.000 claims description 30
- 230000009467 reduction Effects 0.000 claims description 26
- 239000000155 melt Substances 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- 238000010079 rubber tapping Methods 0.000 claims description 15
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000010703 silicon Substances 0.000 claims description 13
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 10
- 238000005272 metallurgy Methods 0.000 claims description 6
- 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 description 5
- 238000010309 melting process Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 description 26
- 238000006722 reduction reaction Methods 0.000 description 20
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229910005347 FeSi Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- 241000812633 Varicus Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- CUSDLVIPMHDAFT-UHFFFAOYSA-N iron(3+);manganese(2+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mn+2].[Fe+3].[Fe+3] CUSDLVIPMHDAFT-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052566 spinel group Inorganic materials 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 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)
Description
TRANSLATION (HM-671PCT): ; PCT/EP2004/004, 313
METHOD FOR RECOVERING METALLIC ELEMENTS, ESPECIALLY
METALLIC CHROMIUM, FROM SLAGS THAT CONTAIN
METAL OXIDES IN AN ELECTRIC ARC FURNACE
The invention concerns a method for recovering metallic elements, especially metallic chromium, from slags that contain oxides, especially chromium oxides, in an electric arc furnace, a converter, and in ladle metallurgy.
During the melting down of metal scrap in arc furnaces, oxidation processes occur in which the metallic elements of the melt react to oxides. In the case of high-grade steels, such as chromium steels and chromium-nickel steels, it is mainly the expensive chromium which is oxidized. Parallel to this process, the oxides are alsc reduced again. In the case of high-chromium steels, especially chromium oxide reduction with carbon constitutes a fundamental mechanism. in this regard, the primary oxidation of the chromium is compensated by a parallel reduction with the carbon dissolved in the melt. This reaction takes place at the bubble surface and at the metal/slag phase boundary. The product of the reactions, metallic chromium, is returned to the melt. The carbon monoxide that forms is carried ) off into the furnace atmosphere after diffusion in bubbles at . the surface.
The following reactions occur: {0} = 2 [0]) dissociation (1) {C] + [0] = {CO} direct decarbonization (2) 2[(Cr] + 3[0] = (Cr,0;3) chromium oxidation (3)
These reactions occur under the following thermodynamic equilibrium: 2 3
K(T)=—rPeo. (4) acacr,0, where log K(T) = “222 + 25.63 + p (5) in which p is a parameter.
Due tc the incompleteness =f the chromium reductior with the carbon, portions of the chromium oxide in the form of varicus spinels enter the slag. Depending on the type of process management, the chromium oxide content of the slag varies and is more or less above 5%. The economy of the process 1s based on reducing the chromium oxides and recovering the metallic chromium.
This is usually accomplished by carrying out a separate reduction of the slag with high-affinity silicon in the form of . FeSi at the end of the meltdown process.
WO 00/79014 Al describes a solution to the problem of making the process of recovering metallic chromium from slags that contain chromium oxide more economical in converter processes or vacuum processes. It is proposed that the conventional treatment step of slag reduction be omitted. Slag that is present, for example, after an oxygen-blowing operation in a converter or in a ladle is removed unreduced from the metal melt and charged to an upstream arc furnace. With the addition of carbon and with silicon from the scrap charged to the arc furnace, possibly with residual dusts, the chromium oxide in the slag is then directly reduced to metallic chromium during the meltdown process.
WO 02/33130 Al describes a process in which metallic chrom:zum Is reccvered in a metallurgical vessel in which both a melting process and a blowing process are carried out, especially by the conarc process. In this process, slag that forms after the first blowing process remains unreduced in the vessel. The slag, together with the next charge, is heated in the same vessel, reduced, and then tapped. The next blowing process then takes place, and the slag which now forms is again left in the vessel.
Proceeding from this prior art, the objective of the . invention is to make available an economical process for the reduction of oxides, especially chromium oxides, in the slag that forms in electric arc furnaces after the meltdown process.
This objective is achieved by the methods with the features of Claims 1 and 6. Advantageous refinements of the method are specified in the dependent claims.
The basic idea of the invention is to dispense with the —-- previously customary -- slag reduction after the melting operation to obtain the first melt. The treatment step of slag reduction is not carried out until after the second melting of a second charge or additional charges.
In detail, the following process steps are carried out: A scrap charge is introduced into the arc furnace and melted down tc produce a metal melt and slag. The conventional slag reduction step Is then omitted. The melt 1s tapped, and the slag, which has a high chromium oxide content and is saturated with manganese-iron oxide, remains unreduced in the furnace vessel.
The next charge is then charged onto this slag. This charge consists of scrap and reducing agents for the slag, especially carbon and/or silicon. It is advisable to add the carbon and/or silicon in the form of carbon-rich and silicon- rich alloying materials. Carbon and silicon are contained, for . example, in charge chromium, ferrochromium, or ferronickel.
They are sufficient for most of the reduction. In certain cases, aluminum or additional carbon and/or silicon additives, such as FeSi, may be added. Reducing agents can also be contained in residual dusts that are charged to the furnace.
During the melting process produced by electric power, the slag is directly reduced with the aid of these reducing agents.
Direct reduction of the chromium oxide with carbon and/or silicon takes place in the arc furnace under atmospheric pressure. The metal oxidation that occurs during the melting process is (over)compensated by reduction reactions, and the metallic chromium is recovered. The slag is then removed. An analogous process takes place in ladle metallurgy, in which the metal 1s already present as a meit.
The prccess in the electric arc furnace is considerably improved by carrying out the method with the use of residual metal bottoms. The reduction quality of the slag is considerably improved by metal bottoms. In this case, the first melt is not completely tapped but rather is only partially tapped to leave metal bottoms in the melting vessel. This has the advantage that the slag floating on these metal bottoms remains in the furnace and thus cannot become stuck to or caked on the bottom of the furnace. In this advantageous modification . of the method of the invention, a melting campaign comprises a buildup melt phase, a separation melt phase, and a repeating phase of meltdown and reduction that occurs between the buildup and separation phases. In contrast to the previously known method in the conarc process, which comprises melting down and blowing with oxygen to produce steel, the present method pertains to the recovery of chromium during meltdown in an arc furnace, and in this method, the process is comparatively simpler and shorter. The chromium concentrations are also not comparable; the chromium concentrations of the slag during meltdown are lower, e.g., on the order of 14-15%.
The proposed method is used especially with high-grade steels that contain chromium or chromium-nickel. Depending on the overall technology, i.e., a high-grade steel technology without z separate reduction treatment of the slag in an electric arc furnace, this process can be optimized with respect to costs and power consumption. It is unimportant for the method whether the slag is in a solid, liquid, or intermediate state. This has an effect only on the meltdown time and the power consumption in the arc furnace.
The thorough mixing necessary for the reduction during the melting process is preferably produced by inert gases, which are . introduced through bottom nozzles and/or side nozzles in the arc furnace and/or through a top lance. The reaction surface between the slag and the metal is increased in this way.
All together, the proposed method has the following advantages: * shortening of the total treatment time of the melt by up to 15 minutes, depending on the type of technology by elimination of the conventional separate reduction step; * reduction of FeSi consumption; * reduction of the consumption of fluxes; * high metal melt output; * increased service life of the refractory material of the furnace; * lncreased service life of the porous plugs/nozzles; * improved energy balance of the electric arc furnace; and * improved degree of purity cof the metal
The individual steps of the method are described in detail below with reference to the sole figure in the form of a process flowchart, which shows the working of the metal in the EAF or electric arc furnace process.
In a first step, a buildup melt without bottom product is produced by melting a scrap charge to form a metal melt and a . slag. The melt is tapped, but only partially, so that metal bottoms with slag floating on top remains in the furnace vessel.
The slag is unreduced.
In the melting and reduction phase that follows, scrap is charged onto these metal bottoms with slag. In addition, reducing agents for the slag, such as carbon and silicon, are added. During the meltdown process, the slag is reduced. The following reduction reactions with carbon and silicon take place: (CR;03) + 3[C] = 2[Cxr] + 3{CO} 2 (Cry03) + 3[Si] = 4[Cxr] + 3(S5i0,)
These reactions lower the chromium oxide concentration of the slag to values below the initial value.
The now reduced slag is tapped. In the further course of “he process, the melt is tapped, but again only partialiy, to leave metal bottoms at the bottom of the furnace vessel.
Further material is then charged onto these metal bottoms. The slag that forms during the meltdown process is directly reduced again. These steps are repeated for each melt of a campaign.
When the campaign has been completed, instead of a partial tapping of the melt, the melt is totally tapped, together with the metal bottoms.
The method can be carried out in an electric arc furnace or ) other types of melting furnaces as well as in ladle metallurgy or converter metallurgy or other metallurgical vessels.
Claims (1)
1. Method for recovering metallic elements, especially metallic chromium, from slags 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 tne charge during the melting process; (g) tapping of the melt and the reduced slag.
Zz. Method in accordance with Ciaim I, 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.
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 acccrdance 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; (gd) 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; -- tre charging of ancther 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.
Figure 1. ’ KEY . Schmelzen = melting Aufgauschmelze ohne Sumpf = buildup melt without bottoms Abstich = tapping Sumpf = bottoms Schmelzen/Reduzieren (gilt fiir jede Schmelze in Kampagne = melting/reduction (for each melt in the campaign) Schmelze mit Sumpf = melt with bottoms Abschlacken = slag tapping Abstich = tapping Abbauschmelze mit Sumpf = separation melt with bottoms Abstich = tapping
Applications Claiming Priority (2)
| 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 |
| 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 (1)
| Publication Number | Publication Date |
|---|---|
| ZA200508277B true ZA200508277B (en) | 2006-12-27 |
Family
ID=33441237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA2005/08277A ZA200508277B (en) | 2003-05-24 | 2005-10-13 | 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 |
| 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 |
| 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 |
| 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 |
| MXPA01012898A (en) * | 1999-06-23 | 2002-07-30 | 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 |
| US7094271B2 (en) * | 2000-10-18 | 2006-08-22 | Sms Demag Ag | 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 DE DE200450002628 patent/DE502004002628D1/en not_active Expired - Lifetime
- 2004-04-23 EP EP20040729097 patent/EP1627085B1/en not_active Expired - Lifetime
- 2004-04-23 WO PCT/EP2004/004313 patent/WO2004104233A1/en active IP Right Grant
- 2004-04-23 RU RU2005140569A patent/RU2352672C2/en not_active IP Right Cessation
- 2004-04-23 CA CA 2525559 patent/CA2525559C/en not_active Expired - Fee Related
- 2004-04-23 UA UAA200512438A patent/UA82239C2/en unknown
- 2004-04-23 KR KR1020057021614A patent/KR20060012288A/en not_active Application Discontinuation
- 2004-04-23 ES ES04729097T patent/ES2277253T3/en not_active Expired - Lifetime
- 2004-04-23 CN CNB2004800142153A patent/CN100350057C/en not_active Expired - Fee Related
- 2004-04-23 JP JP2006529705A patent/JP4912880B2/en not_active Expired - Fee Related
- 2004-04-23 US US10/556,496 patent/US20060196308A1/en not_active Abandoned
- 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 |
|---|---|
| CN100350057C (en) | 2007-11-21 |
| EP1627085B1 (en) | 2007-01-10 |
| CA2525559C (en) | 2011-07-26 |
| ES2277253T3 (en) | 2007-07-01 |
| EP1627085A1 (en) | 2006-02-22 |
| DE10323507A1 (en) | 2004-12-09 |
| CN1795276A (en) | 2006-06-28 |
| RU2005140569A (en) | 2006-05-10 |
| JP4912880B2 (en) | 2012-04-11 |
| JP2007502369A (en) | 2007-02-08 |
| DE502004002628D1 (en) | 2007-02-22 |
| CA2525559A1 (en) | 2004-12-02 |
| RU2352672C2 (en) | 2009-04-20 |
| US20060196308A1 (en) | 2006-09-07 |
| TW200502404A (en) | 2005-01-16 |
| UA82239C2 (en) | 2008-03-25 |
| WO2004104233A1 (en) | 2004-12-02 |
| KR20060012288A (en) | 2006-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ZA200508277B (en) | Method for recovering metallic elements especially metallic chromium from slag containing metal oxides in an electric-arc furnace | |
| US5882375A (en) | Process for the production of hydraulic binders and/or alloys, such as for examples, ferrochromium or ferrovanadium | |
| US6238453B1 (en) | Producing stainless steels in parallel operated vessels | |
| JP2013079449A (en) | Method for recovering metallic chromium from slag containing chromium oxide | |
| US3336132A (en) | Stainless steel manufacturing process and equipment | |
| US5575829A (en) | Direct use of sulfur-bearing nickel concentrate in making Ni alloyed stainless steel | |
| US4198229A (en) | Method of dephosphorization of metal or alloy | |
| JP2000160233A (en) | Method for desulfurize-refining stainless steel | |
| US7094271B2 (en) | Method for producing stainless steels, in particular high-grade steels containing chromium and chromium-nickel | |
| JP2947063B2 (en) | Stainless steel manufacturing method | |
| JP2683406B2 (en) | Method of melting stainless steel | |
| JP3063537B2 (en) | Stainless steel manufacturing method | |
| KR100411288B1 (en) | Method for recovering chromium from electric furnace slag | |
| US3816100A (en) | Method for producing alloy steel | |
| JP2002371313A (en) | Method for smelting molten stainless steel | |
| JPH0959708A (en) | Method for efficently decarburization-blowing stainless steel | |
| JP3173325B2 (en) | How to make stainless steel | |
| JPH0987720A (en) | Method for decarburize-refining chromium-containing molten steel | |
| RU2064509C1 (en) | Method of deoxidizing and alloying vanadium-containing steel | |
| JPH0762413A (en) | Production of stainless steel | |
| ZA200302646B (en) | Method for producing stainless steel, in particular highgrade steels containing chromium and chromium-nickel. | |
| US20050166710A1 (en) | Method for treating alloyed carbonic iron smelts used for the production of steel | |
| JP2805815B2 (en) | Smelting reduction of Ni ore | |
| SU691497A1 (en) | Method of steel smelting | |
| KAMII et al. | Development of a New Stainless Steel Melting and Refining Process (LD-RHOB Process) |