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Composite carbonaceous reductant for industrial silicon and preparation method thereof

A composite carbon and reducing agent technology, applied in silicon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high cost of charcoal, unavailable charcoal, and limited source of charcoal, and achieve low cost and high fixed carbon content , less ash and harmful impurities

Active Publication Date: 2014-08-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous improvement of people's awareness of environmental protection, the source of charcoal has been greatly restricted, resulting in very high cost of purchasing charcoal or even being unable to buy charcoal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The composite carbonaceous reducing agent for industrial silicon, the composite carbonaceous reducing agent is pelletized, the fixed carbon content reaches 77.2wt.%, the volatile content is 19.4wt.%, the ash content is 3.4wt.%. The elements Fe, Al, and Ca are respectively 0.146wt.%, 0.236wt.%, and 0.323wt.%.

[0019] The preparation method of the above-mentioned composite carbonaceous reducing agent for industrial silicon, its concrete steps are:

[0020] (1) First, crush petroleum coke and low-ash coal until particles with a particle size of less than 3mm account for 70%, and then mix them uniformly at a mass percentage of 60:40 to obtain a mixed material, in which the fixed carbon content of petroleum coke and low-ash coal is 90% respectively wt.% and 65wt.%;

[0021] (2) Add M-C# composite binder with a mass of 4wt.% of the mass of the mass of the mass of the mass of the compound to the mass of the compound prepared in step (1), mix well and then add water with a ma...

Embodiment 2

[0026] The composite carbonaceous reducing agent for industrial silicon, the composite carbonaceous reducing agent is in the form of pellets, the fixed carbon content reaches 78.5wt.%, the volatile content is 18.2wt.%, the ash content is 3.3wt.%. The elements Fe, Al, and Ca are controlled at 0.142wt.%, 0.367wt.%, and 0.432wt.%, respectively.

[0027] The preparation method of the above-mentioned composite carbonaceous reducing agent for industrial silicon, its concrete steps are:

[0028] (1) First, crush petroleum coke and low-ash coal until the particles with a particle size of less than 3mm account for 80%, and then mix them uniformly according to the mass percentage of 60:40 to obtain a mixed material, in which the fixed carbon content of petroleum coke and low-ash coal is 85wt respectively .%, 55wt.%;

[0029] (2) Add M-C# composite binder with a mass of 2wt.% of the mass of the mass of the mass of the mass of the compound to the mass of the compound prepared in step (1)...

Embodiment 3

[0034] The composite carbonaceous reducing agent for industrial silicon, the composite carbonaceous reducing agent is pelletized, the fixed carbon content reaches 79.1wt.%, the volatile content is 17.3wt.%, the ash content is 3.6wt.%. The elements Fe, Al, and Ca are controlled at 0.130wt.%, 0.149wt.%, and 0.501wt.%, respectively.

[0035] The preparation method of the above-mentioned composite carbonaceous reducing agent for industrial silicon, its concrete steps are:

[0036] (1) First, crush petroleum coke and low-ash coal until particles with a particle size of less than 3mm account for 70-80%, and then mix them uniformly at a mass percentage of 55:45 to obtain a mixed material, in which the fixed carbon content of petroleum coke and low-ash coal are respectively 87wt.%, 60wt.%;

[0037] (2) Add M-C# composite binder with 3wt.% mass of mixed material to the mixed material prepared in step (1), mix well and then add water with 10wt.% mass of mixed material and stir for 8 mi...

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Abstract

The invention relates to a composite carbonaceous reductant for industrial silicon and a preparation method thereof, and belongs to the industrial silicon smelting and new energy resource technical fields. The composite carbonaceous reductant is of a pellet shape, the fixed carbon content reaches above 75 wt.%, the volatile matter content is 15 wt.%-20 wt.%, the ash content is below 4 wt.%, and the contents of trace elements of Fe, Al and Ca in ash are controlled respectively below 0.15 wt.%, below 0.5 wt.% and below 0.6 wt.%. The preparation method comprises the steps: finely grinding petroleum coke and low-ash coal, mixed evenly, adding a binder and water, then pressing into pellets under the condition of the pressure of 5-10 MPa, drying the pellets, and thus obtaining the composite carbonaceous reductant. The composite carbonaceous reductant for industrial silicon is high in fixed carbon content and good in reaction activity; and the preparation method of the composite carbonaceous reductant for industrial silicon is simple in process and easy to industrialize.

Description

technical field [0001] The invention relates to a composite carbonaceous reducing agent for industrial silicon and a preparation method thereof, belonging to the technical fields of industrial silicon smelting and new energy. Background technique [0002] At present, the industrial silicon-carbon reducing agent is mainly composed of two or more raw materials such as coal, oil coke, semi-coke, blue charcoal, charcoal, and wood (bagasse, peanut shells, etc.) mixed in a certain proportion. Among them, charcoal has been used as the best reducing agent for industrial silicon in my country for a long time because of its excellent physical and chemical properties such as high specific resistance, good reaction activity, and not easy to graphitize at high temperature. However, the source of charcoal is mainly at the cost of sacrificing forests. According to relevant data, since my country built the first industrial silicon electric furnace in the late 1950s, after half a century of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/025
Inventor 马文会陈正杰伍继君魏奎先吕国强周阳于洁刘战伟谢克强杨兴卫杨斌戴永年
Owner KUNMING UNIV OF SCI & TECH
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