CN1876567A - Reducing agents for smelting chemical grade metallic silicon - Google Patents
Reducing agents for smelting chemical grade metallic silicon Download PDFInfo
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- CN1876567A CN1876567A CN 200510026545 CN200510026545A CN1876567A CN 1876567 A CN1876567 A CN 1876567A CN 200510026545 CN200510026545 CN 200510026545 CN 200510026545 A CN200510026545 A CN 200510026545A CN 1876567 A CN1876567 A CN 1876567A
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Abstract
The invention relates the reducing agent of smelting chemical grade metallic silicon, comprising ganister, oil coke and bituminous coal. The mass ratio of ganister and fixed charcoal content is between 2.7:1.3 and 2.9:1.1. The invention has the advantages of reducing the cost of metallic silicon and good economic benefit and social benefit.
Description
Technical field
The present invention relates to a kind of chemical reducing agent, the reductive agent that does not contain charcoal that uses in especially a kind of process of smelting chemical grade metallic silicon.
Background technology
The industrial silicon purposes is very extensive, is mainly used in industries such as fine chemistry industry, metallurgy, electronic information.In chemical industry, industrial silicon is mainly used in produces organosilicon (being coupled agent etc. as silicone oil, silicon rubber, silicone resin, silicon) product.Aspect metallurgical industry, can be used as additive, the reductor of ferrous alloy, the alloying constituent of silicon steel and silumin, its product is widely used in defense and commercial industry.Being mainly used in manufacture order crystal silicon, polysilicon and semiconductor material in the electronic information industry, is the especially requisite starting material of high-tech industry of modern industry.And along with science and technology development, the Application Areas of Pure Silicon Metal also will further enlarge.
Since China since nineteen fifty-seven, first hot stove of industrial silicium mine was constructed and put into operation, all be in a very long time as single reductive agent with charcoal.Therefore, metal smelting silicon will consume a large amount of charcoals.In general, 1 ton of Pure Silicon Metal of every smelting is wanted 1.4-1.8 ton charcoal, needs about 5 tons timber and fire 1 ton of charcoal, that is to say that 1 ton of Pure Silicon Metal of every smelting will consume 7-9 ton timber, and this China for forest reserves poorness is fatal.Therefore, want to keep the Sustainable development of industrial silicon industry, just must seek a kind of charcoal substitute and reduce silica.The mixing reductive agent that the mid-1960s brings into use charcoal, refinery coke and bituminous coal to form.Carried out again with corn cob, wooden unit and furfural dregs etc. since the seventies and partly replaced charcoal as reducer, and the consumption that enlarges coal in the reductive agent mixture.
Some back yard industry silicon enterprise is in order to guarantee in the industrial silicon quality of not carrying out under the refining situation, adopted all and made reductive agent with refinery coke, the production long-term stability is carried out, but quality product is not high, iron in the product, aluminium, calcium contents can only reach 0.5%, 0.5% and 0.3%, and obvious this method is not suitable for the requirement of modernization industry.And bituminous coal is counted as the ideal substitute of charcoal always in scientific and technological circle, because it is Well-recovered, bigger than resistance height, thermal value, simultaneously its distribute wide, reserves are big, low price, also there are many enterprises to come metal smelting silicon at home, also obtained some effects with a small amount of bituminous coal for replacing part charcoal.But; above-mentioned various trials all are the content that reduces charcoal in above-mentioned agent to a certain extent, can not replace charcoal with bituminous coal fully and come smelting chemical grade metallic silicon, so still can consume a large amount of timber; can not reach well and conserve forests the purpose that reduces cost.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and a kind of reductive agent of smelting chemical grade metallic silicon is provided, and it avoids using charcoal in reductive agent.
For solving technical problem of the present invention, a kind of reductive agent of smelting chemical grade metallic silicon, it comprises silica, refinery coke and bituminous coal, wherein the quality proportioning of fixed carbon content summation remains on 2.7 in silica and the reductive agent: 1.3-2.9: between 1.1.
Technical scheme of the present invention also has following feature: in weight part, and silica 55-65%, refinery coke 15-20%, bituminous coal 5-20%.
Technical scheme of the present invention also has following feature: can also comprise in the reductive agent not being higher than 10% wooden unit.
Compared with prior art; the invention has the beneficial effects as follows: owing in reductive agent, do not comprise charcoal; so can use that domestic storage is abundant, low price, the various easily raw coal of buying come smelting chemical grade metallic silicon; reduced the cost of metal smelting silicon; reduced the consumption of charcoal; protect the domestic forest reserves less and less, produced big business's economic benefit and social benefit.
Embodiment
Below in conjunction with embodiment the present invention is further described.
The reductive agent of a kind of smelting chemical grade metallic silicon of the present invention, it comprises silica, refinery coke and bituminous coal, wherein the quality proportioning of fixed carbon content summation remains on 2.7 in silica and the reductive agent: 1.3-2.9: between 1.1.In the first embodiment of the present invention: prepare burden according to following ratio of components,
(1) batching: in weight part, silica: about 56 parts, refinery coke: about 19 parts, bituminous coal: about 16 parts, wooden unit: about 9 parts, wherein, described silica size range is 50～100mm; The bituminous coal size range is 1～30mm, and the refinery coke size range is 1～20mm;
(2) batch mixing: the raw material of said ratio is mixed, make it even;
(3) feed intake: mixed material is dropped in the smelting furnace at regular intervals, and make it into the steamed bun shape;
(4) smelt: continue the energising heating and smash stove as required;
(5) go out silicon water: after smelting reaches 2-4 hour, pierce through fire door silicon water is flowed out in the silicon water bag smoothly with arc burner;
(6) refining: flow at silicon water at 2/3 o'clock toward silicon water bag, the gas mixture of oxygen and nitrogen is fed silicon water bag refining 10-30 minute, and add chromium compounds, niobide compound, material insulation such as mulching straw simultaneously as refining agent;
(7) casting: silicon water left standstill in cast packet, cast then after 5-10 minute;
Adopting the index of the Pure Silicon Metal that this prescription smelts out is Si:99.676%, Fe:0.26%, Al:0.03%, Ca:0.034%.
In a second embodiment, proportion of raw materials in the following manner,
(1) batching: in weight part, silica: about 60 parts, refinery coke: about 16 parts, charcoal: 0 part, bituminous coal: about 19 parts, wooden unit: about 5 parts; Described silica size range is 50～100mm; The bituminous coal size range is 1～30mm, and the refinery coke size range is 1～20mm
(2) batch mixing: the raw material of said ratio is mixed, make it even;
(3) feed intake: mixed material is dropped in the smelting furnace at regular intervals, and make it into the steamed bun shape;
(4) smelt: continue the energising heating and smash stove as required;
(5) go out silicon water: after smelting reaches 2-4 hour, pierce through fire door silicon water is flowed out in the silicon water bag smoothly with arc burner;
(6) refining: flow at silicon water at 2/3 o'clock toward silicon water bag, the gas mixture of oxygen and nitrogen is fed silicon water bag refining 10-30 minute, and add chromium compounds, niobide compound, material insulation such as mulching straw simultaneously as refining agent;
(7) casting: silicon water left standstill in cast packet, cast then after 5-10 minute;
Adopting the index of the Pure Silicon Metal that this prescription smelts out is Si:99.672%, Fe:0.27%, Al:0.03%, Ca:0.028%.
In the third embodiment of the present invention, proportion of raw materials is undertaken by following mode,
(1) batching: in weight part, silica: about 64 parts, refinery coke: about 12 parts, charcoal: 0 part, bituminous coal: about 20 parts, wooden unit: about 4 parts; Described silica size range is 50～100mm; The bituminous coal size range is 1～30mm, and the refinery coke size range is 1～20mm
(2) batch mixing: the raw material of said ratio is mixed, make it even;
(3) feed intake: mixed material is dropped in the smelting furnace at regular intervals, and make it into the steamed bun shape;
(4) smelt: continue the energising heating and smash stove as required;
(5) go out silicon water: after smelting reaches 2-4 hour, pierce through fire door silicon water is flowed out in the silicon water bag smoothly with arc burner;
(6) refining: flow at silicon water at 2/3 o'clock toward silicon water bag, the gas mixture of oxygen and nitrogen is fed silicon water bag refining 10-30 minute, and add chromium compounds, niobide compound, material insulation such as mulching straw simultaneously as refining agent;
(7) casting: silicon water left standstill in cast packet, cast then after 5-10 minute;
Adopting the index of the Pure Silicon Metal that this prescription smelts out is Si:99.678%, Fe:0.26%, Al:0.03%, Ca:0.032%.
In sum; the present invention has finished contriver's goal of the invention; compared with prior art; the invention has the beneficial effects as follows: owing in reductive agent, do not comprise charcoal; so can use that domestic storage is abundant, low price, the various easily raw coal of buying come smelting chemical grade metallic silicon, reduced the cost of metal smelting silicon, reduced the consumption of charcoal; protect the domestic forest reserves less and less, produced big business's economic benefit and social benefit.
Claims (6)
1. the reductive agent of a smelting chemical grade metallic silicon, it is characterized in that: comprise silica, refinery coke and bituminous coal, wherein the quality proportioning of fixed carbon content summation remains on 2.7 in silica and the reductive agent: 1.3-2.9: between 1.1.
2. the reductive agent of smelting chemical grade metallic silicon as claimed in claim 1 is characterized in that: in weight part, and silica 55-65%, refinery coke 15-20%, bituminous coal 5-20%.
3. the reductive agent of smelting chemical grade metallic silicon as claimed in claim 2 is characterized in that: wherein can also comprise not being higher than 10% wooden unit.
4. the reductive agent of smelting chemical grade metallic silicon as claimed in claim 2, it is characterized in that: wherein said silica size range is 50～100mm.
5. the reductive agent of smelting chemical grade metallic silicon as claimed in claim 2, it is characterized in that: its metabituminous coal size range is 1～30mm.
6. the reductive agent of smelting chemical grade metallic silicon as claimed in claim 2, it is characterized in that: wherein the refinery coke size range is 1～20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510026545 CN1876567A (en) | 2005-06-08 | 2005-06-08 | Reducing agents for smelting chemical grade metallic silicon |
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| CN 200510026545 CN1876567A (en) | 2005-06-08 | 2005-06-08 | Reducing agents for smelting chemical grade metallic silicon |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102089243A (en) * | 2008-02-20 | 2011-06-08 | Cbd能源有限公司 | Reduction of silica |
| CN106542514A (en) * | 2016-10-18 | 2017-03-29 | 马龙县明龙焦化实业有限公司 | Compound semi-coke reducing agent of the high temperature of metallic silicon and preparation method thereof and using method |
| 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 |
| CN110342523A (en) * | 2019-07-05 | 2019-10-18 | 聂康斌 | The industrial silicon and its smelting process smelted using petroleum coke addition waste plastics |
-
2005
- 2005-06-08 CN CN 200510026545 patent/CN1876567A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102089243A (en) * | 2008-02-20 | 2011-06-08 | Cbd能源有限公司 | Reduction of silica |
| CN106542514A (en) * | 2016-10-18 | 2017-03-29 | 马龙县明龙焦化实业有限公司 | Compound semi-coke reducing agent of the high temperature of metallic silicon and preparation method thereof and using method |
| 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 |
| CN110342523A (en) * | 2019-07-05 | 2019-10-18 | 聂康斌 | The industrial silicon and its smelting process smelted using petroleum coke addition waste plastics |
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