Reducing agent used for producing industrial silicon

A technology of reducing agent and industrial silicon, applied in the direction of silicon compounds, inorganic chemistry, non-metallic elements, etc., can solve the problem of no substantial breakthrough in process formula and reducing agent

Inactive Publication Date: 2012-07-11
登封电厂集团铝合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of submerged arc furnaces to produce industrial silicon has a history of more than 100 years. Although the capacity, equipment and technical level of industrial silicon submerged arc furnaces are constantly improving

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Mix 40kg of washed coal, 30kg of high-purity carbon powder and 30kg of petroleum coke uniformly to obtain a mixture, and pulverize the particle size of the mixture to below 200 mesh, wherein the washed coal contains 8% by mass of ash and 65% by mass of fixed carbon, high-purity Charcoal powder contains 8% by mass of ash and 80% by mass of fixed carbon, and petroleum coke contains 5% by mass of ash and 90% by mass of fixed carbon;

[0024] 2) Add 8kg of coal tar as a binder, stir evenly, granulate, and dry at 200°C for 15 minutes;

[0025] 3) Sieve, and take the cohesive product with a particle size of 10-30mm to obtain silica coke.

[0026] The performance comparison of gained silica coke and charcoal is described in the following table:

[0027] indicators

[0028] Compared with charcoal, the mass % of ash in silicon coke is reduced from 5% to 3.6%. The reduction of ash can increase the content of fixed carbon, and at the same time reduce unnecessary oxid...

Embodiment 2

[0030] 1) Mix 50kg of water-washed coal, 20kg of high-purity carbon powder and 30kg of petroleum coke to obtain a mixture, and crush the mixture to a particle size below 200 mesh, wherein the water-washed coal contains 8% by mass of ash and 65% by mass of fixed carbon, high-purity The charcoal powder contains 8% by mass of ash and 80% by mass of fixed carbon, and the petroleum coke contains 5% by mass of ash and more than 90% by mass of fixed carbon;

[0031] 2) Add 10kg of binder, stir evenly, granulate, and dry at 200°C for 15 minutes;

[0032] 3) Sieve, and take the cohesive product with a particle size of 10-30mm to obtain silica coke.

[0033] The performance comparison of gained silica coke and charcoal is described in the following table:

[0034] indicators

[0035] Compared with charcoal, the mass% of solid carbon in silicon coke increased from 72% to 92.1%, the mass% of ash content decreased from 5% to 3.9%, the structural strength and specific resistance ...

Embodiment 3

[0037] 1) Mix 30kg of washed coal, 30kg of high-purity carbon powder and 40kg of petroleum coke uniformly to obtain a mixture, and pulverize the particle size of the mixture to below 200 mesh, wherein the washed coal contains 8% by mass of ash and 65% by mass of fixed carbon, high-purity The charcoal powder contains 8% by mass of ash and 80% by mass of fixed carbon, and the petroleum coke contains 5% by mass of ash and more than 90% by mass of fixed carbon;

[0038] 2) Add 15kg of binder, stir evenly, granulate, and dry at 200°C for 15 minutes;

[0039] 3) Sieve, and take the cohesive product with a particle size of 10-30mm to obtain silica coke.

[0040] The performance comparison of gained silica coke and charcoal is described in the following table:

[0041] indicators

[0042] Volatile matter, %

[0043] Compared with charcoal, the mass% of solid carbon in silicon coke increased from 72% to 94.1%, the mass% of ash content decreased from 5% to 1.9%, the...

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PUM

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Abstract

The invention relates to a reducing agent used for producing industrial silicon, which has the advantages of being high in fixed carbon content, less in dosage, low in cost, good in reaction activity and capable of completely replacing wood charcoal to serve as the base or the main reducing agent of the industrial silicon. The reducing agent comprises the following agent by weight: 30 to 50 parts of washed coal, 20 to 30 parts of high-purity carbon powder and 30 to 40 parts of petroleum coke, wherein the washed coal comprises less than 8% of ash and more than 65% of fixed carbon by mass, the high-purity carbon powder comprises less than 8% of ash and more than 80% of fixed carbon by mass, and the petroleum coke comprises less than 5% of ash and more than 90% of fixed carbon by mass. A preparation method of the reducing agent is further disclosed and includes the following steps 1) mixing the washed coal, the high-purity carbon powder and petroleum coke according to the proportion and crushing the mixture to less than 200 meshes; 2) adding adhesive into the mixture evenly in stirring mode and conducting pelleting and drying; and 3) conducting screening to obtain a bonding product with the granularity as 10mm-30mm.

Description

technical field [0001] The invention relates to a reducing agent composition, in particular to a reducing agent composition for producing industrial silicon. Background technique [0002] Industrial silicon is produced in a submerged arc furnace, and the temperature of the reaction zone reaches above 1500°C by using arc heating, so that the SiO in the silica 2 React with C in the reducing agent to form pure Si:SiO 2 +2C=Si+2CO↑, when the silicon liquid in the furnace accumulates enough, the furnace will be released once. The use of submerged arc furnaces to produce industrial silicon has a history of more than 100 years. Although the capacity, equipment and technical level of industrial silicon submerged arc furnaces are constantly improving, the process formula and reducing agent used in them are more than 100 years old. There has been no substantial breakthrough, and charcoal, wood chips, coal, and petroleum coke have been used as reducing agents. Contents of the inven...

Claims

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Application Information

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IPC IPC(8): C01B33/025
Inventor 刘勇闫海洋孙怀德杨大伟仝选歌汪利锋
Owner 登封电厂集团铝合金有限公司
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