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Process for preparing calcium chloride by utilizing high-boiling residues generated by silicon tetrachloride rectification via hydrolysis

A technology of silicon tetrachloride and high boilers, which is applied in the field of polysilicon by-product reuse, and can solve the problems of not being effectively treated, environmental hazards, waste of raw materials, etc.

Pending Publication Date: 2019-01-04
浙江富士特硅材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the high boilers produced by the rectification of silicon tetrachloride are directly discharged or extensively treated, it will not only cause great harm to the environment, but also a great waste of raw materials
[0005] The invention patent of CN 102602936 B discloses a treatment method of silicon tetrachloride raffinate and its device. Although it has effectively treated the silicon tetrachloride raffinate, the high boilers generated by rectification are still only simple collected, not processed effectively

Method used

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  • Process for preparing calcium chloride by utilizing high-boiling residues generated by silicon tetrachloride rectification via hydrolysis
  • Process for preparing calcium chloride by utilizing high-boiling residues generated by silicon tetrachloride rectification via hydrolysis

Examples

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Effect test

Embodiment 1

[0025] A process for preparing calcium chloride by hydrolysis of silicon tetrachloride rectification high boilers figure 1 as shown, figure 2 shown), including the following steps:

[0026] (1) Quicklime and water are stirred and reacted in the emulsification reactor 1 according to the mass ratio = 1:5 to form lime milk, and the temperature of the water is controlled at 55°C. Water is added through the water inlet 17, and quicklime is added through the inlet 16 for quicklime.

[0027] (2) Feed milk of lime into the high boiler hydrolysis reaction kettle 2 from the lime milk feeding port on the upper part of the high boiler hydrolysis reaction kettle. The material flows out from the outlet, and is transported to the pipeline mixer 4 through the hydrolysis circulating pump 3 to mix with the high boiling substances from the high boiling substance metering tank 5 for primary hydrolysis reaction. The liquid delivery rate of the hydrolysis circulating pump is 500L / h, which comes ...

Embodiment 2

[0031] A process for preparing calcium chloride by hydrolysis of silicon tetrachloride rectification high boilers figure 1 as shown, figure 2 shown), including the following steps:

[0032] (1) Quicklime and water are stirred and reacted in the emulsification reactor 1 according to the mass ratio = 1: 10 to form lime milk, and the temperature of the water is controlled at 65°C. Water is added through the water inlet 17, and quicklime is added through the inlet 16 for quicklime.

[0033] (2) Feed milk of lime into the high boiler hydrolysis reaction kettle 2 from the lime milk feeding port on the upper part of the high boiler hydrolysis reaction kettle. The material flows out of the outlet, and is transported to the pipeline mixer 4 through the hydrolysis circulation pump 3 to mix with the high boiling substances from the high boiling substance metering tank 5 to undergo a primary hydrolysis reaction. The liquid delivery rate of the hydrolysis circulation pump is 600L / h, from ...

Embodiment 3

[0037] A process for preparing calcium chloride by hydrolysis of silicon tetrachloride rectification high boilers figure 1 as shown, figure 2 shown), including the following steps:

[0038] (1) Quicklime and water are stirred and reacted in the emulsification reactor 1 according to the mass ratio = 1:8 to form lime milk, and the temperature of the water is controlled at 60°C. Water is added through the water inlet 17, and quicklime is added through the inlet 16 for quicklime.

[0039] (2) Feed milk of lime into the high boiler hydrolysis reaction kettle 2 from the lime milk feeding port on the upper part of the high boiler hydrolysis reaction kettle. The material flows out from the outlet, and is transported to the pipeline mixer 4 through the hydrolysis circulation pump 3 to mix with the high boiling substances from the high boiling substance metering tank 5 to undergo primary hydrolysis reaction. The liquid delivery rate of the hydrolysis circulation pump is 550L / h, which...

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Abstract

The invention discloses a process for preparing calcium chloride by utilizing high-boiling residues generated by silicon tetrachloride rectification via hydrolysis. According to the process, quicklimeis made into lime milk, and the lime milk is reacted with hydrogen chloride (hydrochloric acid) generated by high-boiling residues via hydrolysis to prepare the calcium chloride. The process is greenand environmentally friendly, and is capable of economically and effectively treating the high-boiling residues generated by silicon tetrachloride rectification so as to provide a new way for the recycle of the high-boiling residues generated by silicon tetrachloride rectification.

Description

technical field [0001] The invention relates to the technical field of polysilicon by-product recycling technology, in particular to a process for preparing calcium chloride by hydrolyzing silicon tetrachloride rectified high boilers. Background technique [0002] In today's situation where fossil energy is increasingly tense and the ecological environment is overwhelmed, solar energy as a renewable energy is increasingly valued by people, and it is the general trend to focus on the development of clean energy. Countries around the world regard solar photovoltaic power generation as the focus of new energy development, and polysilicon, as an important industrial raw material required for the development of the solar energy industry, has become a hot spot for investment, thus stimulating the market demand for polysilicon. Most enterprises adopt the improved Siemens method process, which produces a large amount of by-product silicon tetrachloride during the production of polys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/28
CPCC01F11/28
Inventor 谭军刘国晶杨晓义郑杰孙飞王德球徐慧芬范建平
Owner 浙江富士特硅材料有限公司
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