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Method for preparing polysilicon

A technology of polysilicon and liquid silicon, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of low purification degree, short process flow, and cannot be reduced, and achieve good impurity removal effect, reduce process steps, and operate simplified effect

Active Publication Date: 2013-02-20
江西盛丰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantages are short process flow, low pollution, and low energy consumption. Its disadvantage is that the degree of purification is low, and the boron and phosphorus impurities in silicon cannot be reduced to the requirements of solar-grade polysilicon at the same time, and even phosphorus needs to be removed separately or boron removal steps

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 200Kg of raw silicon containing 10ppm boron and 10ppm phosphorus into a refining furnace, and conduct electric heating in an air atmosphere at 1 atmosphere until the silicon becomes molten. Keep the liquid silicon temperature at 1455°C, put 200kg of CaO containing 72Kg, 36Kg of Na 2 CO 3 and 92Kg of SiO 2 The basic slagging agent is put into liquid silicon in 40 times for refining. Each addition is 5Kg, with an interval of 10 minutes each time. After the refining is completed, filter out the slag in the liquid silicon, then transfer the liquid silicon to the casting container through the microporous filter of the casting container, and finally orient the liquid silicon at a cooling rate of 60°C / hour Cool to obtain a silicon ingot. After the cooled silicon ingot is pulverized and cleaned, the purity analysis is carried out. The analysis results show that the boron content is 0.35ppm; the phosphorus content is 0.6ppm, meeting the requirements of solar grade silico...

Embodiment 2

[0024] Put 100kg of boron-containing 100ppm and phosphorus-containing 30ppm raw silicon 100Kg into a refining furnace, and conduct electrical heating in an air atmosphere at 1 atmosphere until the silicon becomes molten. Keep the temperature of liquid silicon at 1455°C, put 125 kg of CaO containing 45Kg, 22.5Kg of Na 2 CO 3 and 57.5Kg of SiO 2 The basic slagging agent is put into liquid silicon 100 times for refining. The amount of adding each time is 1.25Kg, and each interval is 10 minutes. After the refining is completed, filter out the slag in the liquid silicon, then transfer the liquid silicon to the casting container through the microporous filter of the casting container, and finally orient the liquid silicon at a cooling rate of 60°C / hour Cool to obtain a silicon ingot. After the cooled silicon ingot is pulverized and cleaned, the purity analysis is carried out. The analysis results show that the boron content is 0.3ppm; the phosphorus content is 0.5ppm, which meet...

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PUM

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Abstract

The invention relates to a method for preparing polysilicon, which belongs to the field of metallurgy. The method comprises: 1) a raw material silicon is fused into a liquid state silicon in the air atmosphere, under one atmospheric pressure; 2) a slagging agent is added into the fused liquid state silicon and refined, and a slag is filtered; 3) the liquid state silicon prepared by the step 2) is directionally cooled for obtaining silicon ingots. The method can remove phosphor and boron from the silicon, thus the silicon can reach the standard of the solar energy level polysilicon. Compared to the prior art, the method of the present invention has the advantages of minimized technology step, simplified operation and reduced cost.

Description

technical field [0001] The invention relates to a method for preparing polysilicon, in particular to a method for preparing solar grade polysilicon by metallurgy. Background technique [0002] With the continuous increase of global energy consumption, conventional non-renewable energy can no longer meet the needs of most countries. According to the analysis of the world's energy authoritative organization, based on the current proven fossil energy reserves and mining speed, the remaining global oil can be exploited for only 40 years, the remaining natural gas can be exploited for only 60 years, and the remaining coal can be exploited for only 60 years. Only 120 years. On the other hand, the exploitation and application of primary energy is also an important cause of ecological damage and global environmental pollution. Therefore, the development and use of renewable new energy is related to the long-term development of human beings and society. [0003] The new energy pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/037
Inventor 苏文华李胜路
Owner 江西盛丰新能源科技有限公司