CN1053640C - Method for prepn. of metal silicon, and reducing agent therefor - Google Patents
Method for prepn. of metal silicon, and reducing agent therefor Download PDFInfo
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- CN1053640C CN1053640C CN98113401A CN98113401A CN1053640C CN 1053640 C CN1053640 C CN 1053640C CN 98113401 A CN98113401 A CN 98113401A CN 98113401 A CN98113401 A CN 98113401A CN 1053640 C CN1053640 C CN 1053640C
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- reducing agent
- ash
- silicon metal
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Abstract
The present invention relates to a method for preparing silicon metal by a submerged arc furnace with a reducing agent which belongs to analogue wood coal, wherein the reducing agent contains less than 4 wt % of ash which c contains no less than 45 wt % of SiO2, less than 15 wt % of Al2O3, less than 10 wt % of Fe2O3 and less than 6 wt % of CaO; the reducing agent is obtained by washing and coking selected soft coal.
Description
The present invention relates to used reductive agent in the production method of Pure Silicon Metal and this method.
Pure Silicon Metal is the important source material that is used to produce aspects such as silicon-containing alloy and electronic industry.Traditional production method is to use carbonaceous reducing agent, in the hot stove in ore deposit silica is reduced into silicon.Because Pure Silicon Metal has strict requirement to the content of impurity such as Fe, Al, Ca.Therefore when producing Pure Silicon Metal, remove and select SiO for use with the ore deposit heat furnace method
2Content also must select for use reactivity worth good outside 99 (weight) silica more than the %, the carbonaceous reducing agent that ash is low, and in known reductive agent, charcoal is considered to optimal reductive agent.Its reactivity worth is good, and ash is not too high again, even contain the impurity that exceeds standard in its product of producing, can meet the requirements of index by external refining.So producing Pure Silicon Metal with charcoal is method first-selected in this area always.But because charcoal obtains by wood distillation, therefore firing charcoal must consume a large amount of forest reserves.The mass consumption of charcoal makes a lot of areas of China not have Lin Kecai.This viewpoint from the ecological protection in modern times is definitely worthless.
Refinery coke is a kind of reductive agent of known low impurity content.Use it not need external refining just can obtain the fine Pure Silicon Metal.Also there are some producers to adopt refinery coke to add wood chip or produce Pure Silicon Metal in recent years both at home and abroad with addition of wooden unit.But refinery coke has strong graphited characteristic, and it is rapid greying under the smelting temperature of the hot stove in ore deposit, thereby makes furnace bottom rising, and the result has to often stop production take off stove, not only wastes a large amount of electric energy, and the operation of returning the workman brings very big inconvenience.Therefore, when producing Pure Silicon Metal with refinery coke, how to overcome furnace bottom rising is insoluble problem always.
Therefore the object of the present invention is to provide a kind of method that has overcome the production Pure Silicon Metal of above-mentioned shortcoming; The purpose of invention is to provide a kind of reductive agent that is used for aforesaid method.
The present invention is achieved in that in the hot stove in ore deposit, with SiO
2Content is the silicon source greater than the silica of 99 (weight) %, with ash less than 4 (weight) %, in the ash: SiO
2〉=45 (weight) %, Fe
2O
3＜10 (weight) %, Al
2O
3＜15 (weight) %CaO＜6 (weight) %, the class charcoal of fugitive constituent＜8 (weight) % is that reductive agent is smelted.And the time make silica and reductive agent bring Fe content in the Pure Silicon Metal into less than 0.5 (weight) % in batching.
" class charcoal " as herein described be by viscosity bituminous coal not through choosing, wash and make its ash less than 2.5 (weight) %, the ash that obtains through coking is less than 4 (weight) % again, SiO in the ash
2〉=45 (weight) %, Fe
2O
3＜10 (weight) %, Al
2O
3＜15 (weight) %, CaO＜6 (weight) %, the coke of fugitive constituent＜8 (weight) %.Described choosing, wash and coking all belongs to conventional treatment process.
Term used herein " class charcoal " is meant that a kind of the ash content of coal is lower than charcoal, and the close coke of reactivity worth and charcoal.It is to use not viscosity bituminous coal, through selecting, wash the coke of the low impurity content that obtains with coking.
By the method for production Pure Silicon Metal of the present invention, adopt class charcoal of the present invention to smelt as reductive agent, can obtain Si 〉=98.5 (weight) %, Fe＜0.5 (weight) %, Al＜0.5 (weight) %, the Pure Silicon Metal of Ca＜0.3 (weight) %.
Embodiment 1
Make not viscosity bituminous coal through choosing, to be washed till its ash be 2.3 (weight) %, coking in coking furnace again, the result obtains: ash=3.8 (weight) %, the SiO in the ash
2=45.8 (weight) %, Al
2O
3=13 (weight) %, Fe
2O
3=8.7 (weight) %, CaO=4.5 (weight) %, the class charcoal of fugitive constituent=6.8 (weight) %.
With SiO
2=99.7 (weight) %, Fe
2O
3=0.08 (weight) %, Al
2O
3=0.05 (weight) %, the class charcoal of the silica of CaO=0.03% and gained carries out smelting in the hot stove in ore deposit after the proportioning according to the needs of fixed carbon.Concrete technological operation is with identical with the operation of charcoal metal smelting silicon.The result obtains: Al=0.43 (weight) %, Fe=0.46 (weight) %, the Pure Silicon Metal of Ca=0.25 (weight) %.
The present invention has save energy, and is simple to operate, economy and society benefit such as preserve the ecological environment.
Claims (3)
1. produce the method for Pure Silicon Metal, this method be with silica as the silicon source with carbonaceous material as reductive agent, the Fe content that makes silica and Pure Silicon Metal that reductive agent is brought into is less than 0.5 (weight) %, produces Pure Silicon Metal by mine heat furnace smelting, it is characterized in that employed carbonaceous reducing agent is the class charcoal.
2. produce the method for Pure Silicon Metal according to claim 1, it is characterized in that carbonaceous reducing agent class charcoal be by viscosity bituminous coal not through choosing, wash and make its ash, coking and the class charcoal that obtains then less than 2.5 (weight) %.
3. according to the method for claim 2, the ash that it is characterized in that described class charcoal is less than 4 (weight) %, the SiO in the ash
2Be not less than 45 (weight) %, Al
2O
3(weight) %＜15%, Fe
2O
3＜10 (weight) %, CaO＜6 (weight) %, fugitive constituent is less than 8 (weight) %.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98113401A CN1053640C (en) | 1998-01-06 | 1998-01-06 | Method for prepn. of metal silicon, and reducing agent therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98113401A CN1053640C (en) | 1998-01-06 | 1998-01-06 | Method for prepn. of metal silicon, and reducing agent therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1192424A CN1192424A (en) | 1998-09-09 |
| CN1053640C true CN1053640C (en) | 2000-06-21 |
Family
ID=5223132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98113401A Expired - Fee Related CN1053640C (en) | 1998-01-06 | 1998-01-06 | Method for prepn. of metal silicon, and reducing agent therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1053640C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100570021C (en) * | 2007-07-17 | 2009-12-16 | 佳科太阳能硅(厦门)有限公司 | A kind of method of purification of polysilicon and coagulation system thereof |
| CN102001659B (en) * | 2010-12-15 | 2012-09-12 | 黑河阳光伟业硅材料有限公司 | Preparation method of chemical silicon with adjustable aluminum content for producing organic silicon raw materials |
| CN102627281A (en) * | 2012-04-27 | 2012-08-08 | 羊实 | Method for smelting metal silicon by using recycled silicon fines |
| CN102976330B (en) * | 2012-12-18 | 2015-01-21 | 昆明冶金研究院 | Combined carbonaceous reducing agent for smelting metal silicon and preparation method thereof |
| CN108689409A (en) * | 2017-04-06 | 2018-10-23 | 镇江荣德新能源科技有限公司 | A method of preparing metallic silicon using silica crucible fragment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5347323A (en) * | 1976-10-13 | 1978-04-27 | Nippon Denko | Producing method of reducing materials |
| CN1087684A (en) * | 1993-10-25 | 1994-06-08 | 伯闽川 | Method with smelting duriron with raw coal |
| CN1089572A (en) * | 1993-01-09 | 1994-07-20 | 吴旺河 | Silicon alloy high energy compound carbon catalyst and preparation technology thereof |
-
1998
- 1998-01-06 CN CN98113401A patent/CN1053640C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5347323A (en) * | 1976-10-13 | 1978-04-27 | Nippon Denko | Producing method of reducing materials |
| CN1089572A (en) * | 1993-01-09 | 1994-07-20 | 吴旺河 | Silicon alloy high energy compound carbon catalyst and preparation technology thereof |
| CN1087684A (en) * | 1993-10-25 | 1994-06-08 | 伯闽川 | Method with smelting duriron with raw coal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1192424A (en) | 1998-09-09 |
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