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Preparation method and device for solar-grade polycrystalline silicon

A solar-grade and preparation device technology, applied in the field of solar cells, can solve the problems of increased polysilicon and zinc loss, difficult control of reactant quality, equipment corrosion, etc., and achieves high production efficiency, easy control of reactant ratio, and low production cost. Effect

Inactive Publication Date: 2012-05-23
SHENYANG JINBO NEW TECH IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The purity of the zinc chloride obtained in patent CN101311346 is 99.9% or higher, and the metal zinc and silicon in the waste gas of the reactants are chlorinated by chlorine gas, which will inevitably increase the loss of polysilicon and zinc
These methods are all gas-gas reactions, and there are problems such as difficult control of the mass ratio of reactants, high energy consumption, complicated process, and serious corrosion of equipment.

Method used

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  • Preparation method and device for solar-grade polycrystalline silicon
  • Preparation method and device for solar-grade polycrystalline silicon
  • Preparation method and device for solar-grade polycrystalline silicon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The silicon tetrachloride waste is distilled and purified to 7N grade, and the metal zinc obtained by electrolysis is distilled and purified to 7N grade. The temperature of the reducing agent storage chamber and the reaction chamber is controlled at 780°C. The heated and melted liquid zinc is added to the reducing agent storage tank of the reducing agent storage room through the reducing agent liquid inlet, and the liquid zinc enters the reaction nozzle under the action of gravity, and the 7N grade silicon tetrachloride gas is formed by SiCl 4 The inlet pipe is sprayed into the reaction nozzle, and liquid zinc and 7N grade silicon tetrachloride gas undergo a gas-liquid reduction reaction at a temperature of 780 ° C, as follows:

[0043] SiCl 4 (g)+2Zn(l)→Si(s)+2ZnCl 2 (g)

[0044] To prevent the reducing agent from encountering SiCl 4 Cold air absorbs heat and solidifies, SiCl 4 in SiCl 4 The preparation system was heated to a reaction temperature of 780°C.

[00...

Embodiment 2

[0052] Metallurgical grade silicon tetrachloride is distilled and purified to 7N grade, and metal zinc obtained by electrolysis is distilled and purified to 7N grade. The temperature of the reducing agent storage chamber and the reaction chamber is controlled at 900°C. The heated and melted liquid zinc is added to the reducing agent storage tank of the reducing agent storage room through the reducing agent liquid inlet, and the liquid zinc enters the reaction nozzle under the action of gravity, and the 7N grade silicon tetrachloride gas is formed by SiCl 4 The inlet pipe is sprayed into the reaction nozzle, and liquid zinc and 7N grade silicon tetrachloride gas undergo a gas-liquid reduction reaction at a temperature of 900 ° C, as follows:

[0053] SiCl 4 (g)+2Zn(l)→Si(s)+2ZnCl 2 (g)

[0054] To prevent the reducing agent from encountering SiCl 4 Cold air absorbs heat and solidifies, SiCl 4 in SiCl 4 The preparation system was heated to a reaction temperature of 900°C. ...

Embodiment 3

[0062] The silicon tetrachloride waste is distilled and purified to 7N grade, and the metal zinc obtained by electrolysis is distilled and purified to 7N grade. The temperature of the reducing agent storage chamber and the reaction chamber is controlled at 650°C. The heated and melted liquid zinc is added to the reducing agent storage tank of the reducing agent storage room through the reducing agent liquid inlet, and the liquid zinc enters the reaction nozzle under the action of gravity, and the 7N grade silicon tetrachloride gas is formed by SiCl 4 The inlet pipe is sprayed into the reaction nozzle, and liquid zinc and 7N grade silicon tetrachloride gas undergo a gas-liquid reduction reaction at a temperature of 650°C, as follows:

[0063] SiCl 4 (g)+2Zn(l)→Si(s)+2ZnCl 2 (g)

[0064] To prevent the reducing agent from encountering SiCl 4 Cold air absorbs heat and solidifies, SiCl 4 in SiCl 4 The preparation system was heated to a reaction temperature of 650°C.

[0065...

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Abstract

The invention relates to a preparation method and a device for solar-grade polycrystalline silicon. The preparation device is formed by a reactor and a catcher. The reactor is formed by a reducing agent storage chamber and a reaction chamber. The catcher is formed by a first-stage catcher and a second-stage catcher. Liquid zinc reacts with 7N-grade silicon tetrachloride gas under 650-900 DEG C. The product is brought to the catcher. The collected polycrystalline silicon is distilled in vacuum and is directionally solidified to obtain 6N-grage solar polycrystalline silicon. SiCl4 in waste gas is returned and recycled. After ZnCl2 is distilled and purified, the ZnCl2 is electrolyzed to obtain Zn and chlorine which are returned and recycled. The main raw material of the method is 7N-grade silicon tetrachloride obtained from waste silicon tetrachloride or metallurgical-grade silicon tetrachloride in Siemens process through distillation and purification, the production cost is low and the pollution problem caused by the Siemens process is solved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to the preparation technology of solar grade polysilicon. Background technique [0002] Polysilicon is the basic material for manufacturing solar cells. There was no special solar-grade polysilicon production line in the past. The silicon used for solar cells is made of waste materials, defective materials and crucible residues produced in the semiconductor industry. The purity of these waste materials is above 7N, which can meet the requirements of Make solar cells. But the quantity is very small, which can only meet the needs of a small number of electronic products. Since the beginning of the 21st century, with the rapid rise of the photovoltaic industry, the demand for solar-grade polysilicon has grown exponentially. The solar cell market is in desperate need of process technologies capable of mass producing solar-grade silicon. [0003] At present, most domes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/033C30B29/06
Inventor 张廷安李景江李瑞冰豆志河吕国志
Owner SHENYANG JINBO NEW TECH IND