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Industrial silicon smelting method

A smelting method and industrial silicon technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of high energy consumption and low purity, and achieve the effects of high purity, less slag and high yield

Inactive Publication Date: 2012-05-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of low purity and high energy consumption of product silicon in the prior art, the invention discloses a method for smelting industrial silicon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment is used to illustrate the industrial silicon smelting method disclosed in the present invention.

[0031] Mix 60 parts by weight of quartz sand (99.5% purity, 10mm particle size) and 40 parts by weight silicon carbide (10mm particle size), then add 5 parts by weight fluorite (99% purity, 0.5mm particle size), and stir well , to obtain a mixture of raw materials.

[0032] Add the above raw material mixture into an induction furnace, heat it to 1500°C at a heating rate of 25°C / min, transform the heating rate to 15°C / min, heat it to 1900°C, and keep it for 2 hours.

[0033] Lead out the silicon liquid in the induction furnace and let it cool down naturally. 36 parts by weight of product silicon were obtained. Among them, the content of impurity boron is 1.2 ppm.

Embodiment 2

[0035] This embodiment is used to illustrate the industrial silicon smelting method disclosed in the present invention.

[0036] Mix 67 parts by weight of quartz sand (purity 99.1%, particle size 20mm) and 33 parts by weight silicon carbide (particle size 15mm), then add 9 parts by weight fluorite (purity 98.5%, particle size 1mm), stir well, A raw material mixture is obtained.

[0037] Add the above raw material mixture into an induction furnace, heat it to 1500°C at a heating rate of 30°C / min, transform the heating rate to 20°C / min, heat it to 2000°C, and keep it warm for 2.5h.

[0038] Lead out the silicon liquid in the induction furnace and let it cool down naturally. 31 parts by weight of product silicon were obtained. Among them, the content of impurity boron is 1.4 ppm.

Embodiment 3

[0040] This embodiment is used to illustrate the industrial silicon smelting method disclosed in the present invention.

[0041]Mix 43 parts by weight of quartz sand (99% purity, 1mm particle size) and 57 parts by weight silicon carbide (1mm particle size), then add 2 parts by weight fluorite (98% purity, 0.1mm particle size), and stir well , to obtain a mixture of raw materials.

[0042] Add the above raw material mixture into an induction furnace, heat it to 1500°C at a heating rate of 22°C / min, transform the heating rate to 12°C / min, heat it to 1800°C, and keep it for 1.5h.

[0043] Lead out the silicon liquid in the induction furnace and let it cool down naturally. 32 parts by weight of product silicon were obtained. Among them, the content of impurity boron is 1.5 ppm.

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PUM

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Abstract

The invention provides an industrial silicon smelting method. The method includes steps: mixing and heating raw materials containing quartz sand, silicon carbide and fluoride, processing the mixture of the raw materials at the temperature of from 1500 DEG C to 2300 DEG C; and guiding out and cooling generated liquid silicon, wherein the mass ratio of the quartz sand to the silicon carbide in the mixture of the raw materials ranges from 3 to 9.4. The content of impurities of silicon products prepared by the method is low, and yield is high.

Description

technical field [0001] The invention relates to a method for smelting industrial silicon, in particular to a method for smelting high-purity silicon for solar cells. Background technique [0002] Industrial silicon is the most basic functional material in the information, new energy, and new material industries. The industrial products based on it are various in variety and involve a wide range of fields, and are known as "magic metal" and "industrial monosodium glutamate". Its main application fields have four aspects: one is used as an additive for smelting aluminum and steel, the other is used for the synthesis of various organic silicon materials, and the third is purified to produce electronic-grade high-purity industrial silicon and solar-grade high-purity industrial silicon , the fourth is used to manufacture semiconductor silicon, silicon ceramics, silicon carbide, silicon nitride and other new materials. Moreover, with the development of science and technology, th...

Claims

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Application Information

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IPC IPC(8): C01B33/023
Inventor 彭少波白琳司雷吴志能
Owner BYD CO LTD