CN1472137A - Method for preparing silicon metal - Google Patents
Method for preparing silicon metal Download PDFInfo
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- CN1472137A CN1472137A CNA021353328A CN02135332A CN1472137A CN 1472137 A CN1472137 A CN 1472137A CN A021353328 A CNA021353328 A CN A021353328A CN 02135332 A CN02135332 A CN 02135332A CN 1472137 A CN1472137 A CN 1472137A
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- pure silicon
- reductive agent
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Abstract
A process for preparing metal silicon features that the silica rock as silicon source, petroleum coke, washed coal as reducer, and the combustible loose material (tobacco stem or husk) are smelted in ore smelting furnace. The resultant metal silicon contains Si (more than 99 wt.%), Fe (0-0.3), Ca (0-0.2) and Al (0-0.3). Its advantages are continuous production, high output and low electric consumption.
Description
Technical field
The present invention relates to a kind of method of producing Pure Silicon Metal, relate in particular to a kind of method that charcoal is produced Pure Silicon Metal of not having.
Background technology
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 make reductive agent with carbonaceous, in the hot stove in ore deposit silica is reduced into silicon.Therefore in many carbonaceous reducing agents, charcoal is best reductive agent, and it has very high ratio resistance and response capacity, and ash content is lower, void content is high, is prefered method in this area with charcoal as reductive agent production Pure Silicon Metal always.But fire charcoal and must consume a large amount of forest reserves, therefore, it is worthless adopting charcoal to produce Pure Silicon Metal as reductive agent.Refinery coke is a kind of reductive agent of known low impurity content, uses it not need external refining, just can obtain the fine Pure Silicon Metal.Therefore also there is producer to adopt refinery coke to add wood chip or produce Pure Silicon Metal with addition of wooden unit.But have strong graphited characteristic for refinery coke, its rapid greying under the smelting temperature of the hot stove in ore deposit causes furnace bottom rising, not only wastes a large amount of electric energy, and production can not just be produced carry out.When producing Pure Silicon Metal with refinery coke, how to overcome furnace bottom rising is insoluble problem always.
Chinese patent CN1053640C disclose a kind of usefulness not viscosity bituminous coal through the choosing, wash with coking after the coke of the low impurity content that the obtains method of producing Pure Silicon Metal as reductive agent, the not viscosity bituminous coal that this method adopts is through choosing, wash its ash content of back and be less than 2.5 (weight) %, select its ash oontent of coal washing about 4 (weight) % and sell the market, make choosing, bituminous coal ash content after washing is less than 2.5 (weight) %, its price is generally to select coal washing, more than 2 times of refinery coke, and choosing, bituminous coal after washing also will be handled through coking, these all will make the production cost of Pure Silicon Metal raise significantly, make product lack the market competitiveness.
Summary of the invention
The present invention aims to provide a kind of method that does not adopt charcoal as reductive agent, production Pure Silicon Metal that production cost Pure Silicon Metal content low, gained is high.
Design of the present invention is: since the ratio resistance that selects coal washing big, be not easy greying, easier dark the inserting of electrode, with refinery coke with select coal washing to mix the back as reductive agent with certain proportion, to reduce the consumption of refinery coke, can alleviate because the furnace bottom rising phenomenon that the refinery coke greying causes, and add the interior ventilation property of flammable loose material increase smelting furnace, increase than resistance, make refinery coke, select coal washing to be not easy the bonding phenomenon to take place and cause furnace bottom rising.
The technical solution adopted in the present invention is: in the hot stove in ore deposit, be the silicon source with the silica, with refinery coke, select coal washing as reductive agent, and add flammable loose material as raising agent, produce Pure Silicon Metal by smelting.
Described flammable raising agent is any one or a few combination in tobacco rod, Cassava stalk, kaoliang stalk, corn stalk, the husk, and its consumption is the 5%-15% of silica weight.
Described reductive agent: carbon content in the refinery coke＞85%, ash content＜2%, its consumption are the 27.5%-42.5% of silica weight; Select carbon content in the coal washing＞78%, ash content＜4%.
Its concrete production technique is as follows: (1) raw material is prepared
1) to the requirement of silica chemical ingredients: SiO
2Content 〉=99 (weight) %, Fe
2O
3Content≤0.3 (weight) %, Al
2O
3Content≤0.3 (weight) %, CaO content≤0.1 (weight) %;
2) to the requirement of reductive agent: carbon content in the refinery coke＞85%, ash content＜2%, its consumption are the 27.5%-42.5% of silica weight; Select carbon content in the coal washing＞78%, ash content＜4%;
3) flammable loose material is any one or a few in tobacco rod, Cassava stalk, kaoliang stalk, corn stalk, the husk, and its consumption is the 5%-15% of silica weight.(2) configuration furnace charge
1) according to SiO in the used silica
2Content is pressed SiO
2With the chemical equation of C reaction, calculate the required theoretical pure carbon amount of reduction batch of material silica;
2) can provide the 1kg pure carbon to calculate by the flammable loose material of every 10kg, the theoretical pure carbon amount that should be provided by reductive agent is provided the pure carbon amount that button goes flammable loose material to provide;
3) loss of carbon calculates the actual pure carbon amount that should be provided by reductive agent by 10%-12% in the smelting process;
4) the pure carbon amount that is provided according to Jiao of reductive agent PetroChina Company Limited. calculates the consumption that selects coal washing.(3) going into stove smelts
Mixing the raw material mixing thoroughly back the adding in the hot stove in ore deposit smelts.
Experimental results show that repeatedly through the contriver, adopt technical solution of the present invention can obtain Si＞99 (weight) %, Fe＜0.3 (weight) %, Ca＜0.2 (weight) %, the Pure Silicon Metal of Al＜0.3 (weight) %, adopt the present invention's long-term production Pure Silicon Metal furnace bottom in the hot stove in ore deposit not go up, the output increase by 6% the when rate ratio of Pure Silicon Metal is used charcoal as reductive agent, power consumption descend 5%.See the following form:
By above contrast as can be known, adopt method of the present invention to produce Pure Silicon Metal, both can reduce productive expense, help again preserving the ecological environment.Owing to add flammable raising agent, select refinery coke simultaneously for use, select coal washing as reductive agent, solved the technical barrier of furnace bottom rising when smelting effectively, and the requirement of selecting coal washing has been reduced, therefore, the present invention has the good potentiality of applying.
Embodiment
Embodiment 1: proportioning raw materials: 1. SiO
2=99.2 (weight) %, Fe
2O
3=0.19 (weight) %, Al
2O
3The silica 200kg of=0.18 (weight) %, CaO=0.08 (weight) %, 2. the refinery coke 83kg of C=86 (weight) %, ash content=1.7 (weight) %, 3. C=78.5 (weight) %, ash content=3.8 (weight) %'s selects coal washing 19kg, 4. flammable loose material: tobacco rod and husk 22kg, every tobacco rod length squirts less than 20cm, husk water.With above-mentioned raw materials mix mix thoroughly after, add in the hot stove in ore deposit and smelt.Concrete process operation obtains the Pure Silicon Metal of Fe=0.25 (weight) %, Al=0.26 (weight) %, Ca=0.16 (weight) % with identical with the operation of charcoal metal smelting silicon.
Embodiment 2: proportioning raw materials: 1. SiO
2=99.2 (weight) %, Fe
2O
3=0.19 (weight) %, Al
2O
3The silica 200kg of=0.18 (weight) %, CaO=0.08 (weight) %, 2. the refinery coke 62kg of C=88 (weight) %, ash content=1.2 (weight) %, 3. C=78.5 (weight) %, ash content=3.8 (weight) %'s selects coal washing 41kg, 4. flammable loose material: kaoliang stalk 12kg, every kaoliang stalk length is less than 20cm.With above-mentioned raw materials mix mix thoroughly after, add in the hot stove in ore deposit and smelt.Concrete process operation obtains the Pure Silicon Metal of Fe=0.29 (weight) %, Al=0.30 (weight) %, Ca=0.19 (weight) % with identical with the operation of charcoal metal smelting silicon.
Claims (3)
1. method of producing Pure Silicon Metal is characterized in that: be to be the silicon source with the silica, with refinery coke, select coal washing as reductive agent, and add flammable loose material as raising agent, produce Pure Silicon Metal by smelting.
2, a kind of method of producing Pure Silicon Metal according to claim 1, it is characterized in that: described flammable raising agent is any one or a few combination in tobacco rod, Cassava stalk, kaoliang stalk, corn stalk, the husk, and its consumption is the 5%-15% of silica weight.
3, a kind of method of producing Pure Silicon Metal according to claim 1 and 2 is characterized in that described reductive agent: carbon content in the refinery coke＞85%, and ash content＜2%, its consumption are the 27.5%-42.5% of silica weight; Select carbon content in the coal washing＞78%, ash content＜4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02135332 CN1219697C (en) | 2002-07-29 | 2002-07-29 | Method for preparing silicon metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02135332 CN1219697C (en) | 2002-07-29 | 2002-07-29 | Method for preparing silicon metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1472137A true CN1472137A (en) | 2004-02-04 |
| CN1219697C CN1219697C (en) | 2005-09-21 |
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ID=34146110
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02135332 Expired - Fee Related CN1219697C (en) | 2002-07-29 | 2002-07-29 | Method for preparing silicon metal |
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| CN (1) | CN1219697C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173421A (en) * | 2011-03-11 | 2011-09-07 | 信和光伏硅材料（福建）有限公司 | Ore furnace low-phosphorus and low-boron 3N high-purity silicon production technique |
| CN102381708A (en) * | 2010-08-30 | 2012-03-21 | 比亚迪股份有限公司 | Smelting process of industrial silicon |
| CN102976330A (en) * | 2012-12-18 | 2013-03-20 | 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 |
| CN115893422A (en) * | 2022-12-02 | 2023-04-04 | 昆明理工大学 | Method for preparing industrial silicon by smelting silica through pulverized coal injection |
| CN116216723A (en) * | 2023-03-16 | 2023-06-06 | 内蒙古鑫元硅材料科技有限公司 | Co-production process of nano silicon and granular silicon |
-
2002
- 2002-07-29 CN CN 02135332 patent/CN1219697C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381708A (en) * | 2010-08-30 | 2012-03-21 | 比亚迪股份有限公司 | Smelting process of industrial silicon |
| CN102381708B (en) * | 2010-08-30 | 2013-08-21 | 比亚迪股份有限公司 | Smelting process of industrial silicon |
| CN102173421A (en) * | 2011-03-11 | 2011-09-07 | 信和光伏硅材料（福建）有限公司 | Ore furnace low-phosphorus and low-boron 3N high-purity silicon production technique |
| CN102173421B (en) * | 2011-03-11 | 2013-01-16 | 信和光伏硅材料（福建）有限公司 | Production technique of low-phosphorus and low-boron 3N high-purity silicon by ore furnace |
| CN102976330A (en) * | 2012-12-18 | 2013-03-20 | 昆明冶金研究院 | Combined carbonaceous reducing agent for smelting metal silicon and preparation method thereof |
| 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 |
| CN115893422A (en) * | 2022-12-02 | 2023-04-04 | 昆明理工大学 | Method for preparing industrial silicon by smelting silica through pulverized coal injection |
| CN116216723A (en) * | 2023-03-16 | 2023-06-06 | 内蒙古鑫元硅材料科技有限公司 | Co-production process of nano silicon and granular silicon |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1219697C (en) | 2005-09-21 |
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