Method for producing trichlorosilane by utilizing photovoltaic crystalline silicon processing waste mortar

A photovoltaic crystalline silicon and trichlorosilane technology, applied in the directions of halogenated silanes, halogenated silicon compounds, etc., can solve the problems of waste of resources and pollution of the environment, and achieve the effect of realizing resource recycling, simplifying processing technology and reducing costs.

Inactive Publication Date: 2012-04-11
QINGHAI FUZHAO LITHIUM ANODE MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current treatment technology can only recycle the PEG and SiC micropowder, while the most valuable Si micropowder (crystalline silicon cutting debris) is treated as waste because of the chemical reaction during the treatment process, resulting in serious waste of resources and environmental pollution.

Method used

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  • Method for producing trichlorosilane by utilizing photovoltaic crystalline silicon processing waste mortar
  • Method for producing trichlorosilane by utilizing photovoltaic crystalline silicon processing waste mortar

Examples

Experimental program
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Embodiment 1

[0018] As shown in the flow chart of the production of trichlorosilane by processing waste sand from photovoltaic crystal silicon: mixed with 10-40% PEG (polyethylene glycol), 15-30% SiC (cutting abrasive), and 10-1% iron Powder (cutting tool material), quaternary mixture system of 65-29% Si micropowder (crystalline silicon cutting debris)—waste mortar, in process 1 according to application number 201110101064.7 "New method for comprehensive treatment of waste mortar for processing crystalline silicon for photovoltaic cells 》Separate and recycle PEG and iron in waste mortar to obtain binary sand containing Si and SiC, with a mass content of SiC15%, particle size≤30um; Si84%, particle size≤10um; Fe≤0.3%, others≤0.7%, particle size ≤50um; the comprehensive particle size range is 1000-3000 mesh; fully dried after process 2 for later use.

[0019] Potassium chloride KCl and concentrated sulfuric acid H 2 SO 4 Put into the Mannheim reactor, carry out the 2KCl+H of step 3 2 SO 4...

Embodiment 2

[0023] As shown in the process flow chart of using photovoltaic crystal silicon to process waste sand to produce trichlorosilane: a quaternary mixture system mixed with PEG, iron powder, SiC micropowder, and Si micropowder—waste mortar, in process 1 according to the application number 201110101064.7 " New Method for Comprehensive Treatment of Waste Mortar from Crystalline Silicon Processing of Photovoltaic Cells "Separate and recycle PEG and iron in it to obtain a mass ratio of SiC 30%, particle size ≤ 30um; Si 69.4%, particle size ≤ 10um; Fe ≤ 0.3%, others ≤ 0.7% Particle size ≤ 50um; comprehensive particle size range 1000-3000 mesh; fully dried after process 2 for use.

[0024] Potassium chloride KCl and concentrated sulfuric acid H 2 SO 4 Put into the Mannheim reactor, carry out the 2KCl+H of step 3 2 SO 4 == K 2 SO 4 +2HCl↑reaction to generate potassium sulfate K2 SO 4 , to prepare potassium sulfate compound fertilizer; the by-product HCl↑ undergoes process 4 freezin...

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Abstract

The invention relates to a method for producing trichlorosilane by utilizing photovoltaic crystalline silicon processing waste mortar, which comprises the following steps of: separating the photovoltaic crystalline silicon processing waste mortar according to application number 201110101064.7<novel method of comprehensively treating photovoltaic crystalline silicon processing waste mortar>, and recovering PEG (polyethylene glycol) and iron to obtain binary sand containing Si and SiC; carrying out double replacement reaction to potassium chloride and sulfuric acid to obtain potassium sulfate; freezing, dehydrating and preheating byproduct HCl to obtain qualified HCl gas, using the HCl gas to carry the binary sand to an air stream bed reactor to form rotational flow, and separating and precipitating SiC favorable for reaction and non reaction of Si+3HCl=SiHCl3+H2; using the reaction product to carry the non reaction SiC micropowder to a separation purification system, and separating by a dust collection device to recover the SiC micropowder; and separating and purifying according to different physicochemical properties of Si chloride to obtain high-purity SiHCl3, which is used for preparing photovoltaic crystalline silicon materials and organosilane of series of products of organic silicon and alkyl, aryl and organic functional group chlorosilane and the like.

Description

technical field [0001] The invention relates to a method for producing trichlorosilane by using waste mortar processed from photovoltaic crystal silicon, and belongs to the field of comprehensive utilization of solar photovoltaic crystal silicon processing waste. Background technique [0002] Trichlorosilane is an intermediate for the production of photovoltaic crystalline silicon, and is also a raw material for the synthesis of organosilanes, alkyl groups, aryl groups, and organofunctional chlorosilanes. The main preparation methods are: (1) Si and HCl reaction; (2) Hydrogen reduction of tetrachlorosilane Silicon oxide (using catalysts containing aluminum compounds). The method (1) is the most widely used, and the reaction raw material Si powder adopts metallurgical grade silicon powder: Si≥98.5%, Fe≤0.5%, Al≤0.5%, Ca≤0.3%, P 2 o 5 ≤0.3%, particle size 80-200 mesh (75-180um); HCl uses H from electrolyzed saline 2 ↑ and Cl 2 ↑Reaction preparation; Si+3HCl↑=SiHCl 3 ↑+H ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/107
Inventor 尹晏生赵凤忠高明利尹克胜
Owner QINGHAI FUZHAO LITHIUM ANODE MATERIALS
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