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Preparation method of silica micropowder-carbon composite raw material used for smelting industrial silicon

A silicon micropowder and carbon composite technology, which is applied in the direction of silicon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as disposal, and achieve the effects of reducing production costs, reducing production costs, good economic benefits and social benefits

Inactive Publication Date: 2013-02-06
福建上杭新九洲硅业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the demand for microsilica powder in the market is very small, and it cannot be disposed of as ordinary garbage, the storage of microsilica powder by-products has become a heavy burden for industrial silicon companies

Method used

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  • Preparation method of silica micropowder-carbon composite raw material used for smelting industrial silicon
  • Preparation method of silica micropowder-carbon composite raw material used for smelting industrial silicon
  • Preparation method of silica micropowder-carbon composite raw material used for smelting industrial silicon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Weigh 690kg of silica powder, 270kg of petroleum coke powder, and 40kg of binder.

[0045] (2) Put the silicon micropowder, petroleum coke powder and binder in the above step (1) into the mixer, and stir at a speed of 20 rpm for 50 minutes to mix the silicon micropowder, petroleum coke powder and binder evenly into mixed powder.

[0046] (3) Pack the mixed powder obtained in the above step (2) into spherical rubber moulds, and form it by isostatic pressing at 400 MPa to obtain a silicon micropowder-carbon composite block with a particle size of 90 mm, that is, silicon micropowder- Carbon composite raw material, which is spherical in shape, is used as raw material for smelting industrial silicon.

Embodiment 2

[0048] (1) Weigh 790kg of silica powder, 180kg of low-ash coal powder, and 30kg of binder.

[0049] (2) Put the silicon micropowder, low-ash coal powder and binder in the above step (1) into the mixer, and stir at a speed of 50 rpm for 30 minutes to make the silicon micropowder, low-ash coal powder and binder Mix evenly into a mixed powder.

[0050] (3) Pack the mixed powder obtained in the above step (2) into spherical rubber moulds, and form it by isostatic pressing at 500 MPa to obtain a silicon micropowder-carbon composite block with a particle size of 80mm, that is, silicon micropowder- Carbon composite raw material, which is spherical in shape, is used as raw material for smelting industrial silicon.

Embodiment 3

[0052] (1) Weigh 860kg of silica powder, 100kg of charcoal powder, and 40kg of binder.

[0053] (2) Put the silicon micropowder, charcoal powder and binder in the above step (1) into the mixer, and stir at a speed of 40 rpm for 40 minutes, so that the silicon micropowder, charcoal powder and binder are evenly mixed into a mixture Powder.

[0054] (3) Pack the mixed powder obtained in the above step (2) into spherical rubber moulds, and form it by isostatic pressing at 500 MPa to obtain a silicon micropowder-carbon composite block with a particle size of 70 mm, that is, silicon micropowder- Carbon composite raw material, which is spherical in shape, is used as raw material for smelting industrial silicon.

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Abstract

The invention provides a preparation method of a composite raw material for smelting industrial silicon, and the composite raw material is prepared by adopting byproduct silica micropowder collected by an environment-friendly facility (a deduster) used in the production process of the industrial silicon, and the composite raw material is beneficial to improving the production efficiency of the industrial silicon and achieves the effects of recycling resources and energy conservation and emission reduction. SiO2 in the silica micropowder is an absolutely main ingredient and has the characteristics of being large in specific surface area and high in chemical activity. The preparation method comprises the following steps: evenly mixing silica micropowder and carbon reducing agent powder as well as a certain proportion of a binding agent, and carrying out high-pressure forming to obtain composite blocks suitable for size requirements of an industrial silica submerged arc furnace, namely the silica micropowder-carbon composite raw materials. The composite raw materials used in industrial silicon smelting technique can improve the productivity of industrial silicon, and reduce the electricity consumption and the production cost, and the problem of recycling silica micropowder generated in the industrial silicon production is fully solved. When being used in the industrial silicon smelting technique, the silica micropowder-carbon composite raw material prepared by adopting the method has the technical advantages of being less in electricity consumption, high in productivity, and low in cost, thereby having obvious economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of industrial silicon metallurgy, and relates to a method for recycling silicon micropowder collected in the production process of industrial silicon. The silicon micropowder is mixed with carbon reducing agent powder and then formed by high-pressure molding to form a silicon micropowder-carbon composite raw material. It is used as a raw material for smelting industrial silicon, which helps to increase the yield of industrial silicon, reduce power consumption, and reduce production costs. technical background [0002] Industrial silicon is made of silicon oxide (SiO 2 ) obtained by reducing carbon (C) in a submerged arc furnace at a high temperature of about 1800 ° C. Industrial silicon is a dark gray solid with a metallic luster, so it is often called metallic silicon. Industrial silicon is an important basic material of modern industry, widely used in various fields of national economy, including metallur...

Claims

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Application Information

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IPC IPC(8): C01B33/025
Inventor 杜国平温思汉谢建干
Owner 福建上杭新九洲硅业有限公司
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