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Method for external refining purification of industrial silicon

A technology for refining, purifying and industrial silicon, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of small amount of silicon, difficult conversion of technology, high cost, low cost, improved kinetic conditions, and production efficiency. high effect

Active Publication Date: 2015-06-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above studies are all refining of solid industrial silicon, the amount of silicon refined in a single time is relatively small, there are problems such as relatively high cost, and difficult technology transformation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Continuously inject compressed air into the ladle first, then release the silicon melt with a purity of 98% in the submerged arc furnace into the ladle, and at the same time use plasma to touch the silicon water surface in the ladle above the ladle Heating is carried out and the silicon melt is stirred at the same time. The carrier gas of the plasma is a mixture of argon, hydrogen and water vapor, and the power is 60KW, and the temperature of the industrial silicon melt is kept at 1700°C;

[0027] (2) After the temperature rise in step (1), add refining agent SiO to the ladle 2 , CaO, CaF 2 , the mass ratio of the added refining agent to the silicon melt is 10:1, and the refining gas air and oxygen are introduced, the pressure of the refining gas is 1MPa, and the flow rate is 20m 3 / h, the ventilation time is 1h, blowing outside the furnace, slagging and refining;

[0028] (3) After the refining in step (2), the slag and silicon are separated, and then poured to o...

Embodiment 2

[0030] (1) Continuously inject compressed air into the ladle first, then release the silicon melt with a purity of 98% in the submerged arc furnace into the ladle, and at the same time use plasma to touch the silicon water surface in the ladle above the ladle Heating is carried out, and at the same time, the silicon melt is stirred. The carrier gas of the plasma is a mixture of argon and hydrogen, and the power is 60KW, and the temperature of the industrial silicon melt is kept at 1650°C;

[0031] (2) After the temperature rise in step (1), add refining agent SiO to the ladle 2 , CaO, Al 2 o 3 , CaF 2 , the mass ratio of the added refining agent to silicon melt is 20:1, and the refining gas, oxygen-enriched air, H 2 O, the pressure of the refined gas is 10MPa, and the flow rate is 10m 3 / h, the ventilation time is 10h, blowing outside the furnace, slagging and refining;

[0032] (3) After the refining in step (2), the slag and silicon are separated, and then poured to obt...

Embodiment 3

[0034] (1) Continuously inject compressed air into the ladle first, then release the silicon melt with a purity of 98% in the submerged arc furnace into the ladle, and at the same time use plasma to touch the silicon water surface in the ladle above the ladle Heating is carried out while stirring the silicon melt, where the carrier gas of the plasma is argon, the power is 60KW, and the temperature of the industrial silicon melt is kept at 1750°C;

[0035] (2) After the temperature rise in step (1), add refining agent LiF to the ladle. The mass ratio of the added refining agent to silicon melt is 1:20, and the refining gas N is introduced. 2 , the pressure of the refined gas is 20MPa, and the flow rate is 0.5m 3 / h, the ventilation time is 0.5h, blowing outside the furnace, slagging and refining;

[0036] (3) After the refining in step (2), the slag and silicon are separated, and then poured to obtain high-purity industrial silicon. The purity of industrial silicon reaches 3N...

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Abstract

The invention relates to a method for the external refining purification of industrial silicon. According to the method, refining gas is continuously introduced into a two-man ladle before industrial silicon melt is released into the two-man ladle from a submerged-arc furnace, and the silicon melt is then released into the two-man ladle for being subjected to external refining. The industrial silicon melt in the two-man ladle is heated by an external plasma heating device, the external refining temperature for the industrial silicon melt is enabled to be controlled in a certain range, and a refining agent is added into the two-man ladle so as to carry out slagging refinement. Through the external refining process, most metallic impurities, including Al, Ca, Ti, Na and Mg, and partial non-metallic impurity impurities, including B, P, S and C, can be removed from the industrial silicon melt, so that the quality of industrial silicon products is effectively improved, and high-quality industrial silicon products with low boron, phosphorus and metallic impurity content are obtained. The method has the characteristics of full energy utilization and conservation, high production efficiency, less investment in capital construction, no environmental pollution, and the like.

Description

technical field [0001] The present invention relates to a method for refining and purifying industrial silicon melt outside an industrial silicon furnace, in particular to an industrial silicon melt produced in submerged arc furnaces, which can make full use of the heat of industrial silicon melt and realize plasma heating of industrial silicon melt. Refining method outside the body furnace. Background technique [0002] Industrial silicon material is an extremely important intermediate product in the silicon product industry chain. It is the main raw material for manufacturing silicon polished wafers, solar cells and high-purity silicon products. It is the most basic raw material for the information industry and new energy industry. It can also be said that industrial Silicon has become the basic pillar industry of the information age. Therefore, improving product quality, removing impurities from industrial silicon products, and preparing high-purity industrial silicon ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/037
Inventor 魏奎先马文会黄淑萍谢克强王统周阳伍继君杨斌刘大春戴永年
Owner KUNMING UNIV OF SCI & TECH
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