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Method for producing industrial silicon by using petroleum coke as reducing agent

A petroleum coke and reducing agent technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problem of rising impurity content in the bottom of the furnace, and achieve the effects of less impurity content, simple furnace body structure, and fast reaction speed

Active Publication Date: 2008-01-30
SHANGNAN ZHONGJIAN INDAL
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Problems solved by technology

[0003] The invention proposes a method for producing industrial silicon by using petroleum coke as a reducing agent, which solves the technical problems that the existing industrial silicon production method cannot solve the problem of furnace bottom rising and high impurity content

Method used

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Embodiment Construction

[0022] The present invention uses petroleum coke as reducing agent to produce the concrete steps of industrial silicon as follows:

[0023] 1] Raw material preparation: choose SiO 2 Content ≥99%, Fe 2 o 3 Content≤0.04%, Al 2 o 3 Silica with a content of ≤0.04%, CaO content of ≤0.01%, crushed to a particle size of 50-150mm, as a silicon source; powdered petroleum coke with a fixed carbon content of ≥80%, a volatile content of ≥13%, and an ash content of ≤2% is used for reduction Mix well according to the weight ratio of silica:petroleum coke=2:1, add into the submerged arc furnace; the submerged arc furnace includes three graphite electrodes that are distributed in the shape of "product" and respectively connected to the three-phase power frequency power supply, graphite The electrode is a hollow electrode;

[0024] 2] Reduction reaction: heat to the furnace temperature of 2400-2600°C, hold the temperature for 2 hours; stop heating, and pound the furnace; reheat to the fur...

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Abstract

The invention relates to a production method of industrial silicon, comprising the steps: preparation of raw materials, reduction reaction, deslagging and unidirectional solidification. The invention solves the technical problem that the existing industrial silicon production methods fail to solve the problems of upward of a hearth and high content of impurities, thereby having the advantages of low content of impurities, removal of upward situation of the hearth, rapid reaction speed, low energy consumption and simple structure of an oven body.

Description

technical field [0001] The invention relates to a method for producing industrial silicon, in particular to a method for producing industrial silicon in which all petroleum coke is used as a reducing agent. Background technique [0002] The traditional industrial silicon production method is to use carbon as a reducing agent, and reduce silica to silicon in a submerged arc furnace. Charcoal is the best reducing agent, but its application is limited due to the large consumption of forest resources. Petroleum coke can be used as the best substitute for charcoal, but the strong graphitization characteristics of petroleum coke make the bottom of the furnace rise, which seriously affects its application. There are many solutions now, mainly using 70% charcoal and 30% petroleum coke as a reducing agent or using 30% charcoal and 70% petroleum coke as a reducing agent. Disadvantages of petroleum coke. However, adding other reducing agents will also bring new impurities. How to o...

Claims

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Application Information

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IPC IPC(8): C01B33/025
Inventor 蔡华宪
Owner SHANGNAN ZHONGJIAN INDAL
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