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Withdrawn
Application number
EP08710282A
Other languages
German (de)
French (fr)
Other versions
EP2152925A4 (en
Inventor
Gajanan U. Kapur
Vilas D. Tathavadkar
Saripalli M. Rao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tata Steel Ltd
Original Assignee
Tata Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tata Steel Ltd filed Critical Tata Steel Ltd
Publication of EP2152925A1 publication Critical patent/EP2152925A1/en
Publication of EP2152925A4 publication Critical patent/EP2152925A4/en
Withdrawn legal-status Critical Current

Links

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)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (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

WE CLAIM
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.
EP08710282.8A 2007-05-24 2008-02-12 Process for the production of chromium metal nuggets from chromite ores/concentrates. Withdrawn EP2152925A4 (en)

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)

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Publication number Priority date Publication date Assignee Title
CN110306058A (en) * 2019-07-23 2019-10-08 中南大学 A kind of technique of rotary hearth furnace efficient process metallurgical dust sludge containing zinc-iron

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KR101469679B1 (en) * 2009-03-02 2014-12-05 신화메탈 주식회사 Low carbon-ferrochromium manufacturing method by using continuous thermit reaction
WO2011029269A1 (en) * 2009-09-14 2011-03-17 重庆瑞帆再生资源开发有限公司 Method for innocuously treating chromium residue using metallurgical roasting and blast furnace
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
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EA201992240A1 (en) * 2017-03-21 2020-03-23 Ланксесс Дойчланд Гмбх METHOD FOR OBTAINING IRON AND CHROME CONTAINING PARTICLES
US10982300B2 (en) 2017-05-02 2021-04-20 Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Natural Resources Carbothermic direct reduction of chromite using a catalyst for the production of ferrochrome alloy
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CN112226615B (en) * 2020-10-15 2021-11-12 中南大学 Comprehensive utilization method of stainless steel solid waste
GB202108524D0 (en) 2021-06-15 2021-07-28 Eestech Inc Improved smelting system

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CN110306058B (en) * 2019-07-23 2021-03-12 中南大学 Process for efficiently treating zinc-iron-containing metallurgical dust and sludge by rotary hearth furnace

Also Published As

Publication number Publication date
EP2152925A4 (en) 2016-11-09
TR200908848T1 (en) 2012-02-21
ZA200908067B (en) 2010-07-28
JP2010528184A (en) 2010-08-19
KR20100021620A (en) 2010-02-25
CN101765670B (en) 2013-07-17
JP5364091B2 (en) 2013-12-11
CN101765670A (en) 2010-06-30
KR101498995B1 (en) 2015-03-06
WO2008142704A1 (en) 2008-11-27

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