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A preparation method of composite reducing agent applied in industrial silicon smelting production

A reducing agent, industrial silicon technology, applied in silicon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of increased impurity content and high raw material cost, reduce raw material cost, solve environmental problems, and high chemical reaction activity. Effect

Active Publication Date: 2018-01-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the low content of fixed carbon, the proportion of raw materials into the furnace will inevitably increase per ton of silicon, and the cost of raw materials is high, due to the increase in the content of impurities brought in by raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation method of the composite reducing agent applied to industrial silicon smelting production, its specific steps are as follows:

[0017] (1) The particle size ratio of petroleum coke materials: petroleum coke with a particle size below 0.1mm accounts for 60wt%, and the particle size above 0.1mm accounts for 40wt%; the particle size ratio of anthracite materials: the particle size is 0.15~0.3mm The ratio accounts for 75%, and the particle size ratio below 0.15mm accounts for 25%; charcoal powder and biomass charcoal (walnut shell) are mixed at a mass ratio of 1:1 to obtain a carbon powder mixture, and the particle size ratio of the carbon powder mixture: 0.075mm or less The proportion of particle size accounts for 90%, and the proportion of particle size above 0.075mm accounts for 10%. Among them, the fixed carbon content of petroleum coke is more than 80wt%, the fixed carbon content of anthracite is more than 85wt%, and the fixed carbon content of charcoal p...

Embodiment 2

[0021] The preparation method of the composite reducing agent applied to industrial silicon smelting production, its specific steps are as follows:

[0022] (1) The particle size ratio of petroleum coke materials: petroleum coke with a particle size below 0.1mm accounts for 70wt%, and the particle size above 0.1mm accounts for 30wt%; the particle size ratio of bituminous coal materials: the particle size is 0.15~0.3mm The particle size ratio of 0.15mm or less accounts for 30%; charcoal powder and semi-coke are mixed at a mass ratio of 1:2 to obtain a carbon powder mixture, and the particle size ratio of the carbon powder mixture: the particle size ratio of 0.075mm or less accounts for 30%. 85%, the ratio of particle size above 0.075mm accounts for 15%; among them, the fixed carbon content of petroleum coke is more than 80wt%, the fixed carbon content of bituminous coal is more than 45wt%, and the fixed carbon content of charcoal powder is more than 50wt%;

[0023] (2) Mix the ...

Embodiment 3

[0026] The preparation method of the composite reducing agent applied to industrial silicon smelting production, its specific steps are as follows:

[0027] (1) The particle size ratio of petroleum coke materials: petroleum coke with a particle size below 0.1mm accounts for 75wt%, and the particle size above 0.1mm accounts for 25wt%; the particle size ratio of anthracite materials: the particle size is 0.15~0.3mm The ratio accounts for 55%, and the particle size ratio below 0.15mm accounts for 45%; charcoal powder and biomass charcoal (corn straw) are mixed at a mass ratio of 1:2 to obtain a carbon powder mixture, and the particle size ratio of the carbon powder mixture: 0.075mm or less The particle size ratio accounts for 75%, and the particle size ratio above 0.075mm accounts for 25%; among them, the fixed carbon content of petroleum coke is more than 80wt%, the fixed carbon content of anthracite is more than 85wt%, and the fixed carbon content of charcoal powder and biomass ...

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Abstract

The invention relates to a preparation method of a compound reducing agent applied to industrial silicon smelting production, and belongs to the technical field of non-ferrous metal smelting. According to the particle size ratio of petroleum coke materials, the ratio of the petroleum coke with the particle size smaller than 0.1 mm is 60-75wt%, and the ratio of the petroleum coke with the particle size larger than or equal to 0.1 mm is 25-40wt%. According to the particle size ratio of anthracite / bituminous coal materials, the ratio of the anthracite / bituminous coal materials with the particle size being 0.15-0.3 mm is 55-75%, and the ratio of the anthracite / bituminous coal materials with the particle size smaller than or equal to 0.15 mm is 25-45%. Charcoal powder and biomass carbon / carbocoal are mixed according to an arbitrary ratio to obtain charcoal powder mixed materials. According to the particle size ratio of the charcoal powder mixed materials, the ratio of the charcoal powder mixed materials with the particle size ratio smaller than or equal to 0.075 mm is 75-90%, and the ratio of the charcoal powder mixed materials with the particle size ratio larger than or equal to 0.075 mm is 10-25%. The prepared petroleum coke materials, anthracite / bituminous coal materials and the charcoal powder mixed materials are mixed to be uniform to obtain mixed materials, an organic adhesive, an additive and water are added into the mixed materials, the mixture is stirred to be uniform and then prepared into pellets, and the pellets are dried to obtain the compound reducing agent. The compound reducing agent has the advantages of being high in fixed carbon content, high in chemical reactivity, low in ash content and volatile content and the like.

Description

technical field [0001] The invention relates to a preparation method of a composite reducing agent applied in industrial silicon smelting production, and belongs to the technical field of nonferrous metal smelting. Background technique [0002] Industrial silicon production mainly uses silica and carbonaceous reducing agents as raw materials. At present, carbonaceous reducing agents mainly use bituminous coal, charcoal, petroleum coke, and wood blocks as raw materials. For carbonaceous reducing agents, the higher the fixed carbon, the better. However, the fixed carbon content of bituminous coal and coke is quite high, but they cannot be used as raw materials for industrial silicon production. The main reason is that the fixed carbon content in the reducing agent is too high. The corresponding volatile content is relatively low, resulting in relatively low reactivity of the reducing agent, which is not conducive to industrial silicon production and smelting. In the industria...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/025
CPCC01B33/025C01P2006/80
Inventor 马文会陈正杰伍继君魏奎先董艳奇杨兴卫雷云李绍元谢克强杨斌戴永年
Owner KUNMING UNIV OF SCI & TECH
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