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Smelting method for industrial silicon

A smelting method, a technology for industrial silicon, applied in the petroleum industry, chemical instruments and methods, coke ovens, etc., can solve the problem of not mentioning the source of reducing agents and fuel sources, not mentioning the comprehensive utilization of biomass, and not mentioning how to produce Industrial silicon and other problems, to achieve the effect of improving process thermal efficiency and production efficiency, high comprehensive utilization value and low cost

Inactive Publication Date: 2015-09-09
SHENWU TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical disadvantages of using this technology to produce industrial silicon are: (1) This technology uses the traditional electric furnace process, which does not solve the shortcomings of high power consumption, rapid equipment damage, and poor technical and economic indicators in the electric furnace process.
(2) In this technology, the pyrolysis gas produced by biomass pyrolysis is used to produce high value-added chemical products, which will inevitably lead to long process flow, complicated process equipment and high investment cost of this technology
However, this technology has the following disadvantages: (1) This technology does not mention how to produce industrial silicon, nor does it solve the problems of high power consumption in the electric furnace process, rapid equipment damage, and poor technical and economic indicators in the current industrial silicon production.
(2) This technology only mentions that the biomass reducing agent prepared from biomass can be applied to the ferroalloy industry and the electric melting ironmaking industry, but does not mention the comprehensive utilization of biomass
However, this technology has the following disadvantages: (1) In this technology, the industrial silicon production process still uses the traditional submerged arc furnace process, which does not solve the shortcomings of the submerged arc furnace process, such as high power consumption, rapid equipment damage, and poor technical and economic indicators.
(3) This technology does not mention how to comprehensively utilize biomass, but the present invention can realize the comprehensive utilization of biomass, and the biomass charcoal, combustible gas and biomass oil obtained by biomass pyrolysis are all effectively utilized
But this technology has the following disadvantages: (1) Compared with conventional industrial silicon smelting, this technology saves about 40% of electricity, but as long as submerged arc furnace technology is used, it is difficult to fundamentally solve the problem of high power consumption of submerged arc furnace, rapid equipment damage, and technical economy. Disadvantages such as poor indicators
(2) This technology does not mention expanding the source of reducing agent and fuel source for industrial silicon production, but the present invention uses biomass charcoal as reducing agent, and combustible gas obtained by pyrolysis of biomass as heating and smelting energy
(3) This technology does not mention how to comprehensively utilize biomass, but the present invention can realize the comprehensive utilization of biomass, and the biomass charcoal, combustible gas and biomass oil obtained from biomass pyrolysis are all effectively utilized

Method used

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  • Smelting method for industrial silicon

Examples

Experimental program
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Effect test

example 1

[0050] Example 1. After pretreatment, the biomass was put into a pyrolysis furnace for pyrolysis. The pyrolysis temperature was 450° C., and the pyrolysis time was 60 minutes. The fixed carbon content of the obtained biochar was 77.33%. Select the SiO2 content of silica ≥ 99.4%, Fe2O3 content ≤ 0.15%, Al2O3 content ≤ 0.2%, CaO content ≤ 0.1%, crush and sieve the silica to a particle size of 60-80mm as the silicon source, and use the pyrolyzed biomass charcoal Broken to less than 10mm as a reducing agent. Then mix the silica and the reducing agent in a mass ratio of 100:41, mix them evenly, and place them in a gas-fired heating furnace for reduction. The reduction temperature is 1950°C and the reduction time is 3.5 hours. The Si grade of the obtained industrial silicon is ≥99%, and other indicators of the industrial silicon meet the national standard GB / T2881-2008.

example 2

[0051] Example 2. After pretreatment, the biomass was put into a pyrolysis furnace for pyrolysis. The pyrolysis temperature was 600° C. and the pyrolysis time was 45 minutes. The fixed carbon content of the obtained biochar was 83.21%. Select the SiO2 content of silica ≥ 99%, Fe2O3 content ≤ 0.3%, Al2O3 content ≤ 0.3%, CaO content ≤ 0.1%, crush and sieve the silica to a particle size of 50-100 mm as the silicon source, and pyrolyze the biochar Broken to less than 10mm as a reducing agent. Then mix the silica and the reducing agent in a mass ratio of 100:32, mix them evenly, and place them in a gas-fired heating furnace for reduction. The reduction temperature is 2350°C and the reduction time is 2.5 hours. The Si grade of the obtained industrial silicon is ≥99%, and other indicators of the industrial silicon meet the national standard GB / T2881-2008.

example 3

[0052] Example 3. After pretreatment, the biomass was put into a pyrolysis furnace for pyrolysis. The pyrolysis temperature was 700° C. and the pyrolysis time was 30 minutes. The fixed carbon content of the obtained biochar was 85.19%. Select the SiO2 content of silica ≥ 99.2%, Fe2O3 content ≤ 0.2%, Al2O3 content ≤ 0.2%, CaO content ≤ 0.1%, crush and sieve the silica to a particle size of 50-90mm as the silicon source, and use the pyrolyzed biomass charcoal Broken to less than 10mm as a reducing agent. Then mix the silica and the reducing agent in a mass ratio of 100:47, mix them evenly and place them in a gas heating furnace for reduction. The reduction temperature is 2100°C and the reduction time is 3 hours. The Si grade of the obtained industrial silicon is ≥99%, and other indicators of the industrial silicon meet the national standard GB / T2881-2008.

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Abstract

The invention relates to the field of biomass pyrolysis, and provides a smelting method for industrial silicon; the smelting method includes the following steps: a) a step of pretreating biomass; b) a step of carrying out pyrolysis on the pretreated biomass to obtain biomass charcoal, flammable gas and biomass oil; c) a step of mixing the biomass charcoal with silica and batching; and d) a step of sending the biomass carbon and the silica after batching into a combustion gas heating furnace, taking the flammable gas and the biomass oil as a flue in the combustion gas heating furnace, and reducing to obtain the industrial silicon. With utilization of the smelting method for the industrial silicon, the production cost can be effectively reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of biomass pyrolysis and provides a method for smelting industrial silicon. Background technique [0002] (1) The prior art mostly adopts submerged arc furnace process to produce industrial silicon. [0003] Due to the high power consumption of submerged arc furnaces, rapid equipment damage, and poor technical and economic indicators, on the one hand, the production cost of this technology is very high, and on the other hand, it does not conform to the national energy-saving and emission-reduction policies. [0004] (2) The existing technology produces industrial silicon, and charcoal is used as a reducing agent in the early stage. Because charcoal has high specific resistance and responsiveness, low ash content, and high porosity, using charcoal as a reducing agent to produce metal silicon has always been the preferred method in this field, but burning charcoal will inevitably consume a large amount of forest resour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/025C10B53/02
CPCY02E50/10
Inventor 王静静曹志成薛逊吴道洪
Owner SHENWU TECH GRP CO LTD
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