EP2152925A1 - Process for the production of chromium metal nuggets from chromite ores/concentrates. - Google Patents
Process for the production of chromium metal nuggets from chromite ores/concentrates.Info
- Publication number
- EP2152925A1 EP2152925A1 EP08710282A EP08710282A EP2152925A1 EP 2152925 A1 EP2152925 A1 EP 2152925A1 EP 08710282 A EP08710282 A EP 08710282A EP 08710282 A EP08710282 A EP 08710282A EP 2152925 A1 EP2152925 A1 EP 2152925A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chromium
- nuggets
- production
- ore
- chromite
- 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- Withdrawn
Links
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 title claims abstract description 19
- 239000012141 concentrate Substances 0.000 title claims abstract description 15
- 239000011651 chromium Substances 0.000 claims abstract description 34
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 25
- 239000002893 slag Substances 0.000 claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 8
- 239000004571 lime Substances 0.000 claims abstract description 8
- 230000004907 flux Effects 0.000 claims abstract description 7
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 6
- 239000003245 coal Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 4
- 230000001590 oxidative effect Effects 0.000 claims abstract 3
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000001465 metallisation Methods 0.000 claims description 2
- 150000002978 peroxides Chemical class 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 239000008188 pellet Substances 0.000 abstract description 2
- 238000005453 pelletization Methods 0.000 abstract 1
- 230000009467 reduction Effects 0.000 description 19
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- -1 chromium carbides Chemical class 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/06—Alloys based on chromium
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/10—Roasting processes in fluidised form
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
- 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
-
- 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
Definitions
- the present invention relates to development of a process for production of chromium Nuggets. More particularly the present invention rotates to development of a process for production of chromium nuggets by low temperature preoxidized chromites ore/concentrates with 50-70 % metallization.
- Another object of the present invention is to propose a process for production of chromium nuggets by low temperature reduction of pre-oxidized chromites ores/concentrated which saves energy.
- a further object of the present invention is to propose a process for production of chromium nuggets by low temperature reduction of pre-oxidized chromites ores/concentrate which reduces the cost of production of ferro chrome by 20%.
- a still further object of the present invention is to propose a process for production of chromium nuggets by low temperature reduction of pre- oxidized chromites ors/concentrated which reduces coke consumption.
- An yet further object of the present inventions is to propose a process for production of chromium nuggets by low temperature reduction of pre- oxidized chromites ores/concentrated which possess a better reaction surface during further processing is steel melting.
- a still another object of the present invention is to propose a process for production of chromium nuggets by low temperature reduction of pre- oxidized chromites ores/concentrated which can n exportable to used directly in stainless steel manufacturing.
- the chromites ores/concentrates with Cr Fe ratio ranging from 1.0 to 3.3 we oxidized at low temperatures (900° C).
- the oxidized samples show complete oxidation of FeO phase to Fe 2 O 3 .
- Reduction of oxidized chromite ores/concentrate was carried out using coal ass reductant.
- Flux used consists of silica source (quarl) and lime.
- the reduction experiments carried out using the controlled atmosphere high temperature furnace.
- the raw materials used alongwith there composition given is the following tables.
- the experimental studies for reduction were carried out at low temperatures of 1400-1550 0 C.
- the coal redundant is used in 30-50% excess of the stichoimeti ⁇ c carbon requirement for reduction of iron oxide (Fe 2 O 3 ) and chrome oxides (Cr 2 Os) in the ore.
- the flux addition was carried out as quartz addition in the range of 0-10% excess of required for aluminium oxides and magnesium oxide dissolution to slag.
- the lime addition was done in the rage of 3-10% of the chromite ore/concentrate.
- Reduction was carried out in the temperature range of 1400-1550 0 C for 1.5- 3.0 hours.
- the chromite nuggets product id shown in fig 1.
- chromium carbides C 7 C 3
- iron chromium carbides C 7 C 3
- the Chemistry of the chromium metal, nugget and slag products produced is given in Table 2.
- the metal nugget diameter ranges from 0.5-25 cms.
- the metal and slag phase separation is clear which after quenching in water can be separated by physical separation methods.
- the oxidation of the chromite ores also helps in reducing the reduction time.
- Chromium oxide reacts at 1200 to 1600 0 C with carbon to form one of the carbides Cr 3 Cr 25 Cr 7 C 3 .
- Fig 1 Shows a photo- view of chromium nugget produces other reduction of oxidized chromite ore/concentrates.
- Fig 2 Shows a micro-structure of the chromium metal nugget.
- Fig 3 Shows a process flow sheet for production of chromium nuggets.
- Fig 3- shows A Process flow sheet for the commercial production of the chromium nuggets.
- the oxides of the chromium ore/concentration (1) will be carried out in fluidized bed (2) rotary furnace (2) and a hot air (3) blow means also provided there.
- the oxidized ore/concentrates are fed into storage bin (4), a bin of reduction (5) and a bin of flux (6) are provided near the oxidation unit.
- the oxidized ores are then mixed in a mixer (7) and after mixing with the coal reductant and flux (silica, lime) is fed to s palletized (8).
- the pellets are fed to a rotary hearth the furnace (9) for carrying out the reduction in it.
- the metal and slag product obtained from the rotary hearth furnace (9) is fed to a physical separation unit (11) for the separation of chromium metal nuggets (12) and slag (13).
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A process for the production of chromium nuggets from chromite ore/concentrate comprises: - oxidizing chromite ore/chromium concentrate (1 ) comprising a Cr : Fe-ratio ranging from 1.0 to 3.3 in a furnace (2) at a temperature of 900 °C, - mixing (7) the oxidized ore (4) with reductant coal (5) and fluxes (lime, silica) (6), - pelletizing (8) the mixture, - reducing the pellets in a rotary furnace (9) at a temperature between 1.400 and 1.600 °C, - separating the thus produced chromium nuggets (12) from slag (13) in a separation unit (11).
Description
TITLE
Process for the production of chromium metal nuggets from chromite ores/concentrates
FIELD OF THE INVENTION
The present invention relates to development of a process for production of chromium Nuggets. More particularly the present invention rotates to development of a process for production of chromium nuggets by low temperature preoxidized chromites ore/concentrates with 50-70 % metallization.
BACKGROUND OF THE INVENTION
In any integrated metal alloy manufacturing organization, high carbon Ferro chromium is commonly produce by smelting-reduction route. This is highly energy intensive and requires an imported low-ash coke as a reducing agent. Low-ash coke and electricity are both expensive resources. Therefore, a movel process route is developed by reduction of pre-oxidized chromium ore using a coal as reductant for product of 50-70% metallized chromites ore production in the form of Ferro chromium.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to propose a process for production of chromium nuggets by low temperature reduction of pre- oxidized chromites ors/concentrated which eliminates the disadvantages of prior Art.
Another object of the present invention is to propose a process for production of chromium nuggets by low temperature reduction of pre-oxidized chromites ores/concentrated which saves energy.
A further object of the present invention is to propose a process for production of chromium nuggets by low temperature reduction of pre-oxidized chromites ores/concentrate which reduces the cost of production of ferro chrome by 20%.
A still further object of the present invention is to propose a process for production of chromium nuggets by low temperature reduction of pre- oxidized chromites ors/concentrated which reduces coke consumption.
An yet further object of the present inventions is to propose a process for production of chromium nuggets by low temperature reduction of pre- oxidized chromites ores/concentrated which possess a better reaction surface during further processing is steel melting.
A still another object of the present invention is to propose a process for production of chromium nuggets by low temperature reduction of pre- oxidized chromites ores/concentrated which can n exportable to used directly in stainless steel manufacturing.
SUMMARY QF THE INVENTION
The chromites ores/concentrates with Cr: Fe ratio ranging from 1.0 to 3.3 we oxidized at low temperatures (900° C). The oxidized samples show complete oxidation of FeO phase to Fe2O3. Reduction of oxidized chromite ores/concentrate was carried out using coal ass reductant. Flux used consists of silica source (quarl) and lime. The reduction experiments carried out using the controlled atmosphere high temperature furnace. The raw materials used alongwith there composition given is the following tables.
Table 1 Raw materials and their Composition (wt%)
The experimental studies for reduction were carried out at low temperatures of 1400-15500C. The coal redundant is used in 30-50% excess of the stichoimetiϊc carbon requirement for reduction of iron oxide (Fe2O3) and chrome oxides (Cr2Os) in the ore. Based on the special slag designed, the flux addition was carried out as quartz addition in the range of 0-10% excess of required for aluminium oxides and magnesium oxide dissolution to slag. The lime addition was done in the rage of 3-10% of the chromite ore/concentrate. Reduction was carried out in the temperature range of 1400-15500C for 1.5- 3.0 hours. The chromite nuggets product id shown in fig 1.
The sample microstructure of the product alongwith the phase composition is shown in Fig 2. It can be seen that the metal shows two phase one chromium rich and the other rich phase. The presence of chromium in the nugget product is in form of chromium carbides (C7C3) and iron chromium carbides.
The Chemistry of the chromium metal, nugget and slag products produced is given in Table 2. The metal nugget diameter ranges from 0.5-25 cms. The metal and slag phase separation is clear which after quenching in water can be separated by physical separation methods.
Table 2 Chemistry of Chromium metal nugget and slag
Reaction mechanisms:
The oxidation of FeO the chromite ore/concentrated opens the spinel structure which increases the reactivity of chromite spinel due to formation of vacancies.
The oxidation of the chromite ores also helps in reducing the reduction time.
The reduction mechanism of chromite ores/concentrates in absence of lime as flux, generally proceeds as per the following steps. Chromium oxide reacts at 1200 to 16000C with carbon to form one of the carbides Cr3Cr25 Cr7C3.
3Cr2O3 + 13C→ 2Cr3C2 + 9CO (1150-12000C) 27CR3C + 5Cr O → 13Cr C + 15 CO (1200-16000C)
At still higher temperature Cr7C3 reacts with C^Ce and finally above 1820 C the Cr metal is favored product. However due to use of lime as fluxing above component the slag formation reactions plays an important role in carrying out the reduction of chrome oxide at lower temperatures. In presence of lime as fluxing component the slag formation reactions take place t lower temperatures which promotes the reduction by dissolution in slag.
DETAILS DESCRIPTION OF THE ACCOMPANYING DRAWING
Fig 1 : Shows a photo- view of chromium nugget produces other reduction of oxidized chromite ore/concentrates.
Fig 2: Shows a micro-structure of the chromium metal nugget.
Fig 3: Shows a process flow sheet for production of chromium nuggets.
DETAILS DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
Fig 3- shows A Process flow sheet for the commercial production of the chromium nuggets. The oxides of the chromium ore/concentration (1) will be carried out in fluidized bed (2) rotary furnace (2) and a hot air (3) blow means also provided there. The oxidized ore/concentrates are fed into storage bin (4), a bin of reduction (5) and a bin of flux (6) are provided near the oxidation unit.
The oxidized ores are then mixed in a mixer (7) and after mixing with the coal reductant and flux (silica, lime) is fed to s palletized (8). The pellets are fed to a rotary hearth the furnace (9) for carrying out the reduction in it. The metal and slag product obtained from the rotary hearth furnace (9) is fed to a physical separation unit (11) for the separation of chromium metal nuggets (12) and slag (13).
KEY FEATURES
Claims
1. A process for production of Chromium nuggets by low temperature peroxides chromite ore/Concentrate comprises :-
a chromium metal nuggets having a chemical composition
Cr 50-60%
C 3.0-6.0%
Si 0.7-1.0%
S 0.01-0.03%
P 0.003-0.04%
the metal nugget diameter ranges from 0.5-2.5 cms.
2. The process pf producing chromium nuggets comprising: an oxidizing of chromite ore/chromium concentrate (Cr: Fe ration ranging from 1.0 to 3.3) in a furnace at a low temperature of 9000C; mixing oxidizing ore with reductant coal and flux (lime, silica) in a mixture (7); palletizing the mixing in a palletizer (8); reducing the pattet in rotary hearth furnace (9) at a temperature
1400-16000C and separating chromium nuggets from slag in a separation unit (11).
3. The process as claimed in claim two wherein the metalization of chrome ore 50-70% is obtained.
4. The process for production of chromium nuggets by low temperature pre-oxidized chromite ore/concentrates as substantially described and illustrated herein with reference to accompanying drawings and figures.
5. The chromium nuggets produced from the above process as substantially described and illustrated herein with reference to accompanying drawing and figures.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN802KO2007 | 2007-05-24 | ||
| PCT/IN2008/000087 WO2008142704A1 (en) | 2007-05-24 | 2008-02-12 | Process for the production of chromium metal nuggets from chromite ores/concentrates. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2152925A1 true EP2152925A1 (en) | 2010-02-17 |
| EP2152925A4 EP2152925A4 (en) | 2016-11-09 |
Family
ID=40031451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08710282.8A Withdrawn EP2152925A4 (en) | 2007-05-24 | 2008-02-12 | Process for the production of chromium metal nuggets from chromite ores/concentrates. |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP2152925A4 (en) |
| JP (1) | JP5364091B2 (en) |
| KR (1) | KR101498995B1 (en) |
| CN (1) | CN101765670B (en) |
| TR (1) | TR200908848T1 (en) |
| WO (1) | WO2008142704A1 (en) |
| ZA (1) | ZA200908067B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110306058A (en) * | 2019-07-23 | 2019-10-08 | 中南大学 | A process for efficiently treating zinc-containing iron metallurgical dust with a rotary hearth furnace |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101469679B1 (en) * | 2009-03-02 | 2014-12-05 | 신화메탈 주식회사 | A method for manufacturing low-carbon ferrochromium using continuous thermite reaction |
| RU2551729C2 (en) * | 2009-09-14 | 2015-05-27 | Чонгкинг Рюифан Реньювэбл Ресорсес Девелопмент Ко., Лтд. | Method of chromium slag neutralisation using annealing method and blast-furnace process |
| WO2013011521A1 (en) * | 2011-07-18 | 2013-01-24 | Tata Steel Limited | A method for direct reduction of oxidized chromite ore fines composite agglomerates in a tunnel kiln using carbonaceous reductant for production of reduced chromite product/ agglomerates applicable in ferrochrome or charge chrome production. |
| CN102432068B (en) * | 2011-09-28 | 2013-10-16 | 北京科技大学 | Process for producing sodium chromate |
| CN102994850A (en) * | 2012-10-29 | 2013-03-27 | 海门市金易焊接材料有限公司 | Low-carbon chromium metal |
| WO2015015250A1 (en) * | 2013-08-01 | 2015-02-05 | North-West University | Process for enhanced pre-reduction of chromite |
| WO2016115593A1 (en) * | 2015-01-20 | 2016-07-28 | Pelleton Ip Holdings Limited | Method for producing a chromite agglomerate |
| CN110431243A (en) * | 2017-03-21 | 2019-11-08 | 朗盛德国有限责任公司 | The method for preparing the particle of iron content and chromium |
| FI3619331T3 (en) | 2017-05-02 | 2024-11-04 | Her Majesty The Queen In Right Of Canada As Represented By The Mini Of Natural Resources | Carbothermic direct reduction of chromite using a catalyst for the production of ferrochrome alloy |
| CN107699685A (en) * | 2017-08-09 | 2018-02-16 | 江苏省冶金设计院有限公司 | A kind of production method of silicochromium |
| US10508319B1 (en) * | 2019-06-27 | 2019-12-17 | MM Metals USA, LLC | Method and system for producing low carbon ferrochrome from chromite ore and low carbon ferrochrome produced thereby |
| CN112251600A (en) * | 2019-07-22 | 2021-01-22 | 孙凌玉 | Preparation method and application of chromium metallization ball |
| CN112226615B (en) * | 2020-10-15 | 2021-11-12 | 中南大学 | A comprehensive utilization method of stainless steel solid waste |
| GB202108524D0 (en) | 2021-06-15 | 2021-07-28 | Eestech Inc | Improved smelting system |
| WO2025116755A1 (en) * | 2023-11-29 | 2025-06-05 | Re Alloys Sp. Z O.O. | Ferrosilicochromium with a low admixture content, method of its production and its application in production of low carbon ferrochrome |
| CN118389823B (en) * | 2024-06-28 | 2024-09-27 | 内蒙古新太元新材料有限公司 | Chromite prereduced pellet and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5137246B1 (en) * | 1970-05-11 | 1976-10-14 | ||
| JPS4936848B1 (en) * | 1970-12-30 | 1974-10-03 | ||
| JPS50136211A (en) * | 1974-04-18 | 1975-10-29 | ||
| US4414026A (en) * | 1981-07-30 | 1983-11-08 | Nippon Kokan Kabushiki Kaisha | Method for the production of ferrochromium |
| JPS58193330A (en) * | 1982-05-04 | 1983-11-11 | Kawasaki Steel Corp | Preliminary reducing method and apparatus for reducing chromium ore by melting |
| PH22151A (en) * | 1983-12-31 | 1988-06-01 | Krupp Gmbh | Process for the production of ferrochromium |
| JPS6169944A (en) * | 1984-09-13 | 1986-04-10 | Nippon Steel Corp | Manufacturing method by melting reduction of ferrochrome |
| DE3518555C1 (en) * | 1985-05-23 | 1986-01-09 | Fried. Krupp Gmbh, 4300 Essen | Process for the reduction of iron-containing chrome ores |
| DE3713883A1 (en) * | 1987-04-25 | 1988-11-17 | Metallgesellschaft Ag | Process for producing ferrochromium |
| JP3335504B2 (en) * | 1995-07-21 | 2002-10-21 | 富士通株式会社 | Clock distribution device |
| CN1172010C (en) * | 2001-11-15 | 2004-10-20 | 湖南铁合金集团有限公司 | process for producing low-Ti High-C ferrochronium |
| JP4307849B2 (en) * | 2003-01-07 | 2009-08-05 | 株式会社神戸製鋼所 | Method for reducing chromium-containing raw materials |
-
2008
- 2008-02-12 WO PCT/IN2008/000087 patent/WO2008142704A1/en active Application Filing
- 2008-02-12 JP JP2010508969A patent/JP5364091B2/en not_active Expired - Fee Related
- 2008-02-12 EP EP08710282.8A patent/EP2152925A4/en not_active Withdrawn
- 2008-02-12 CN CN2008800171953A patent/CN101765670B/en not_active Expired - Fee Related
- 2008-02-12 TR TR200908848T patent/TR200908848T1/en unknown
- 2008-02-12 KR KR1020097026723A patent/KR101498995B1/en not_active Expired - Fee Related
-
2009
- 2009-11-16 ZA ZA200908067A patent/ZA200908067B/en unknown
Non-Patent Citations (1)
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| See references of WO2008142704A1 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110306058A (en) * | 2019-07-23 | 2019-10-08 | 中南大学 | A process for efficiently treating zinc-containing iron metallurgical dust with a rotary hearth furnace |
| CN110306058B (en) * | 2019-07-23 | 2021-03-12 | 中南大学 | A process for efficient treatment of metallurgical dust and sludge containing zinc and iron in a rotary hearth furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008142704A1 (en) | 2008-11-27 |
| TR200908848T1 (en) | 2012-02-21 |
| CN101765670B (en) | 2013-07-17 |
| KR20100021620A (en) | 2010-02-25 |
| JP5364091B2 (en) | 2013-12-11 |
| JP2010528184A (en) | 2010-08-19 |
| ZA200908067B (en) | 2010-07-28 |
| KR101498995B1 (en) | 2015-03-06 |
| EP2152925A4 (en) | 2016-11-09 |
| CN101765670A (en) | 2010-06-30 |
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