CN1300361C - Process for producing high-carbon-chromium iron - Google Patents
Process for producing high-carbon-chromium iron Download PDFInfo
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- CN1300361C CN1300361C CNB2004100128815A CN200410012881A CN1300361C CN 1300361 C CN1300361 C CN 1300361C CN B2004100128815 A CNB2004100128815 A CN B2004100128815A CN 200410012881 A CN200410012881 A CN 200410012881A CN 1300361 C CN1300361 C CN 1300361C
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Abstract
The present invention relates to a method for producing high carbon ferrochrome by using a solid carbonaceous reducing agent, which adopts the raw materials of ferrochromium powder, iron mineral powder, coal powder or coke powder, slaked lime, silica powder, etc., wherein the raw materials are blended, pressed into blocks or pelletized and dried, and then the raw materials are reduced at the high temperature of 1350 to 1500 DEG C; reduction product is pulverized naturally in a cooling process, and ferrochromium granules are separated from slag by sieving. The present invention has the advantages of simple manufacturing process, low quality requirements for the raw materials, no use of electric energy or coke with high quality, low energy consumption, low production cost and environmental-friendly property, and more than 80 percent of sulfur and 20 to 40 percent of phosphorus in the raw materials can be effectively removed.
Description
One, technical field
The invention belongs to a kind of production method of iron alloy.Especially relate to a kind of method of producing high carbon ferro-chrome with solid carbonaceous reducing agent.
Two, background technology
High carbon ferro-chrome is mainly used in smelting stainless steels such as AOD, VOD, combined blown converter.High carbon ferro-chrome is mainly used mine heat furnace smelting at present, and chromite is made reductive agent with high grade coke in electric furnace, makes thermal source fusing slag iron (G. Fu Er cut with electric energy, K.-D. Frank edits, Yu Hui, Gu Jingqing translate. iron alloy metallurgy, Science and Technology of Shanghai press, 1978.10; M. И. Jia Xike, H. П. La Jishefu, Б. И. Ye Mulin work, Zhang Feng, Yu Zhong etc. translates. theory and technology that iron alloy is produced, metallurgical industry press, 1994.8).Though this method technology comparative maturity, complex process, can not dephosphorization, the energy consumption height, and can only use lump ore or ore agglomerates, the production cost height, pollution on the environment is big.
Three, summary of the invention
The purpose of this invention is to provide a kind of technology simple, to raw materials quality require low, without electric energy and high grade coke, energy consumption is low, production cost is low, environmental friendliness, can effectively remove the production method of the high carbon ferro-chrome of the phosphorus of bringing in the raw material.
For achieving the above object, the technical solution adopted in the present invention is: raw materials such as chromite powder, powdered iron ore, coal dust or coke powder, slaked lime, ground silica through mixing, briquetting or make ball, drying, are at high temperature reduced, cool off the back screening then.
The mass ratio of above-mentioned raw materials is: chromite powder 30～60%, powdered iron ore＜40%, coke powder or coal dust 8～20%, slaked lime 10～30%, ground silica＜15%.Requirement to raw material is:
Chromite: Cr
2O
3＞40%, Al
2O
3/ MgO＞0.8, granularity-1mm part＞90%;
Powdered iron ore: TFe＞50%, granularity-0.074mm part＞40%;
Coal dust or coke powder: fixed carbon 〉=75%, volatile matter≤10%, granularity-0.1mm part＞50%;
Slaked lime: CaO 〉=65%, SiO
2＜5%, granularity-0.1mm part＞50%;
Ground silica: SiO
2＞85%, granularity-0.1mm part＞50%.
, the ferrochrome particle is separated with bits with raw material blending, briquetting or make slag natural efflorescence in process of cooling in ball, drying, high temperature reduction, the reduzate according to above-mentioned requirements by screening.
Process furnace can be combustion gas, fire coal or fuel oil heating, and stove can be rotary hearth furnace or tunnel (stove) kiln, and adjusting furnace atmosphere is neutrality or weak oxide atmosphere.Furnace high-temperature band temperature is 1350 ℃～1500 ℃, at the thermal zone residence time 20～40min.
Owing to adopt technique scheme, technology of the present invention is simple, to raw materials quality require low, without electric energy and high grade coke, energy consumption is low, production cost is low, environmental friendliness, can effectively remove 20～40% the phosphorus of bringing in the sulphur more than 80% brought in the raw material and the raw material.
Four, embodiment
[embodiment] 1 chromite and iron ore all are powder-material, and reductive agent is a coke powder, and flux is slaked lime and ground silica.Its mass ratio is: chromite 40～60%, iron ore 5～20%, coke powder 8～15%, slaked lime 10～25%, ground silica 3～15%.
Requirement is to raw materials quality:
Chromite: Cr
2O
3＞40%, Al
2O
3/ MgO＞0.8, granularity-1mm part＞90%;
Powdered iron ore: TFe＞50%, granularity-0.074mm part＞40%;
Coke powder: fixed carbon 〉=80%, volatile matter≤5%, granularity-0.1mm part＞50%;
Slaked lime: CaO 〉=65%, SiO
2＜5%, granularity-0.1mm part＞50%;
Ground silica: SiO
2＞85%, granularity-0.1mm part＞50%.
Powder raw material proportioning weighing on request, mixing, briquetting or make ball, drying after at high temperature the reduction, 1380 ℃～1480 ℃ of reduction temperatures, recovery time 20～40min cools off again.Slag in the reduzate is natural efflorescence in process of cooling, by screening the ferrochrome particle is separated with bits.Product is the particulate state high carbon ferro-chrome that contains chromium 40～65%.
Present embodiment adopts the rotary hearth furnace of fuel Heating, and adjusting furnace atmosphere is neutrality or weak oxide atmosphere.
[embodiment] 2 chromites and iron ore all are powder-material, and reductive agent is a coal dust, and flux is slaked lime and ground silica.Its mass ratio is: chromite 30～50%, powdered iron ore 20～40%, coal dust 10～20%, slaked lime 15～30%, ground silica 3～10%.
Requirement is to raw materials quality:
Chromite: Cr
2O
3＞40%, Al
2O
3/ MgO＞0.8, granularity-1mm part＞90%;
Powdered iron ore: TFe＞50%, granularity-0.074mm part＞40%;
Coal dust: fixed carbon 〉=75%, volatile matter≤10%, granularity-0.1mm part＞50%;
Slaked lime: CaO 〉=65%, SiO
2＜5%, granularity-0.1mm part＞50%;
Ground silica: SiO
2＞85%, granularity-0.1mm part＞50%.
Powder raw material proportioning weighing on request, mixing, briquetting or make ball, drying after at high temperature the reduction, 1350 ℃～1500 ℃ of reduction temperatures, recovery time 20～40min cools off again.Slag in the reduzate is natural efflorescence in process of cooling, by screening the ferrochrome particle is separated with bits.Product is for containing chromium 30～55%.
Present embodiment adopts tunnel (stove) kiln of combustion gas heating, and adjusting furnace atmosphere is neutrality or weak oxide atmosphere.Present embodiment technology is simple, to raw materials quality require low, without electric energy and high grade coke, energy consumption is low, production cost is low, environmental friendliness, can effectively remove 20～40% the phosphorus of bringing in the sulphur more than 80% brought in the raw material and the raw material.
Claims (2)
1, a kind of production method of high carbon ferro-chrome, it is characterized in that raw materials such as chromite powder, powdered iron ore, coal dust or coke powder, slaked lime, ground silica are at high temperature reduced through mixing, briquetting or after making ball, drying, reduction temperature is 1350～1500 ℃, recovery time 20～40min, cooling then; Slag in the reduzate is natural efflorescence in process of cooling, by screening the ferrochrome particle is separated with bits;
The quality percentage composition of described raw material is: chromite powder 30～60%, powdered iron ore＜40%, coke powder or coal dust 8～20%, slaked lime 10～30%, ground silica＜15%, wherein,
Chromite: Cr
2O
3＞40%, Al
2O
3/ MgO＞0.8, granularity-1mm part＞90%;
Powdered iron ore: TFe＞50%, granularity-0.074mm part＞40%;
Coal dust or coke powder: fixed carbon 〉=75%, volatile matter≤10%, granularity-0.1mm part＞50%;
Slaked lime: CaO 〉=65%, SiO
2＜5%, granularity-0.1mm part＞50%;
Ground silica: SiO
2＞85%, granularity-0.1mm part＞50%.
2, the made high carbon ferro-chrome particle of the production method of high carbon ferro-chrome according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100128815A CN1300361C (en) | 2004-03-22 | 2004-03-22 | Process for producing high-carbon-chromium iron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100128815A CN1300361C (en) | 2004-03-22 | 2004-03-22 | Process for producing high-carbon-chromium iron |
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|---|---|
| CN1673403A CN1673403A (en) | 2005-09-28 |
| CN1300361C true CN1300361C (en) | 2007-02-14 |
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ID=35046176
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|---|---|---|---|
| CNB2004100128815A Expired - Fee Related CN1300361C (en) | 2004-03-22 | 2004-03-22 | Process for producing high-carbon-chromium iron |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112663B (en) * | 2015-08-24 | 2017-08-29 | 中冶东方工程技术有限公司 | A kind of combined producing process of high carbon ferro-chrome and semi-coke |
| CN105714107A (en) * | 2016-02-26 | 2016-06-29 | 铜陵安东铸钢有限责任公司 | Ferro-vanadium refining furnace burden and preparing method thereof |
| CN106756138B (en) * | 2016-12-02 | 2018-10-23 | 陕西友力实业有限公司 | A kind of method of microwave heating production ferrochrome |
| CN108977607A (en) * | 2018-08-06 | 2018-12-11 | 王德清 | A kind of joint smelting process of high carbon ferro-chrome and forsterite |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1118380A (en) * | 1994-09-07 | 1996-03-13 | 江油仁和企业总公司 | Process for producing high carbon content chrome iron |
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2004
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1118380A (en) * | 1994-09-07 | 1996-03-13 | 江油仁和企业总公司 | Process for producing high carbon content chrome iron |
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