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Method for separating and extracting silicon from silicon residue

A technology of silicon slag and mechanical separation, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as difficulty in achieving ideal effects, and achieve the effects of strong practicability, obvious effects, and simple and easy operation.

Inactive Publication Date: 2018-01-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some researchers have tried to separate silicon slag, it is difficult to achieve the desired effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the method for separating and extracting silicon from silicon slag, concrete operations are as follows:

[0020] (1) Using industrial silicon slag with Fe, Al, and Ca contents of 0.187%, 0.121%, and 0.083% respectively as raw materials, weigh 80g of silicon slag and put it into a graphite crucible, place the crucible in an intermediate frequency induction furnace, and simultaneously place the furnace Evacuate the inside to 10Pa, and then fill the vacuum chamber with argon until the pressure is 1 atmosphere;

[0021] (2) Adjust the current frequency of the intermediate frequency induction furnace to 2.5kHz and the power to 4.6kW, start the intermediate frequency induction furnace for heating, and measure the temperature with an infrared thermometer;

[0022] (3) After the temperature in the furnace reaches 1450°C, keep the molten silicon slag warm for 30 minutes, and then reduce the power to lower the temperature in the furnace to 20°C at a rate of 35°C / min...

Embodiment 2

[0024] Embodiment 2: the method for separating and extracting silicon from silicon slag, concrete operations are as follows:

[0025] (1) Using industrial silicon slag with Fe, Al, and Ca contents of 0.187%, 0.121%, and 0.083% respectively as raw materials, weigh 100g of silicon slag and put it into a graphite crucible, place the crucible in an intermediate frequency induction furnace, and simultaneously place the furnace Evacuate the inside to 5Pa, and then fill the vacuum chamber with argon until the pressure is 1 atmosphere;

[0026] (2) Adjust the current frequency of the intermediate frequency induction furnace to 2.8kHz, power 5kW, start the intermediate frequency induction furnace for heating, and measure the temperature with an infrared thermometer;

[0027] (3) After the temperature in the furnace reaches 1500°C, keep the molten silicon slag warm for 2 hours, and then reduce the power to lower the temperature in the furnace to 25°C at a rate of 20°C / min;

[0028] (4)...

Embodiment 3

[0029] Embodiment 3: the method for separating and extracting silicon from silicon slag, concrete operations are as follows:

[0030] (1) Using industrial silicon slag with Fe, Al, and Ca contents of 0.187%, 0.121%, and 0.083% respectively as raw materials, weigh 80g of silicon slag and put it into a graphite crucible, place the crucible in an intermediate frequency induction furnace, and simultaneously place the furnace Evacuate the inside to 5Pa, and then fill the vacuum chamber with argon until the pressure is 1 atmosphere;

[0031] (2) Adjust the current frequency of the intermediate frequency induction furnace to 3.0kHz, power 6kW, start the intermediate frequency induction furnace for heating, and measure the temperature with an infrared thermometer;

[0032] (3) After the temperature in the furnace reaches 1700°C, keep the molten silicon slag warm for 1 hour, and then reduce the power to lower the temperature in the furnace to 23°C at a rate of 50°C / min;

[0033] (4) U...

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Abstract

The invention discloses a method for separating and extracting silicon from silicon residue. The method comprises: placing a crucible filled with silicon residue in an induction furnace, vacuumizing the furnace to achieve 5-10 Pa, inflating with argon gas, starting the induction furnace, heating the silicon residue to a temperature of 1450-1700 DEG C, carrying out thermal insulation for 0.5-2 h, cooling to a temperature of 20-25 DEG C, and completely separating the cooled silicon from the residue by using a mechanical separation method so as to separate and extract the silicon from the siliconresidue. According to the present invention, the extraction rate of the silicon in the silicon residue reaches above 95%; with the method, a certain removal effect on Fe, Al and Ca in the silicon canbe provided; and the method has advantages of simple operation, low cost and environmental protection, can solve the problems of difficult separation and difficult reutilization of the silicon residue in the industrial silicon enterprises, and can be directly used in industrial silicon production processes.

Description

technical field [0001] The invention relates to a method for separating and extracting silicon from silicon slag, belonging to the technical field of separation and purification. Background technique [0002] Industrial silicon is an industrial product smelted from silica and carbonaceous reducing agent in a submerged thermal electric furnace, and the main component silicon content is above 98%. As a basic material, industrial silicon is widely used in metallurgy, chemical industry, electronics, machinery and other industries. As a raw material for producing solar-grade silicon, industrial silicon is constantly developing. At present, the global industrial silicon production capacity has reached 5.9 million tons per year, with an output of 3.14 million tons, and China's production capacity has reached 4.6 million tons per year, accounting for 78% of the world's total production capacity, with an output of 2.1 million tons. [0003] Silicon slag is a kind of metallurgical sl...

Claims

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Application Information

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IPC IPC(8): C01B33/037
Inventor 伍继君夏振飞马文会魏奎先雷云谢克强李绍元杨斌戴永年
Owner KUNMING UNIV OF SCI & TECH
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