Method for preparing white carbon black from polysilicon byproduct silicon tetrachloride

A silicon tetrachloride and white carbon black technology, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problems of weakening product binding force, long reaction process, and low activity of white carbon black, so as to improve resource utilization and product quality. The quality, production equipment and process are simple to operate, and the effect of realizing environment-friendly production

Inactive Publication Date: 2012-05-02
安徽祥源科技股份有限公司
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Problems solved by technology

The shortcomings of this gas phase method are: high raw material prices, long reaction process, high energy consumption in the production process, and high product prices, which are limited
The shortcomings of this precipitation method are: the activity of the prepared white carbon black is not high, the particles are not easy to control, the affinity is poor, the reinforcing performance is low, and the hydrophilic groups on the surface of the particles are seriously bonded, which weakens the binding force of the product. Production of low-grade products, narrow product application range, and small market capacity

Method used

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  • Method for preparing white carbon black from polysilicon byproduct silicon tetrachloride

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Experimental program
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Effect test

Embodiment 1

[0019] 1) Put silicon tetrachloride into the hydrolysis reaction kettle, carry out hydrolysis reaction at 30°C and normal pressure for 1 hour, filter the silicic acid gel and send it to the drum reactor, and HCl gas passes through the primary and secondary acid recovery kettles Water is absorbed and made into hydrochloric acid for subsequent use;

[0020] 2) Add sodium bicarbonate to the drum reactor from the feeding tank, control the mass ratio of silicic acid gel and sodium bicarbonate to 1:2, so that the alkali modulus of sodium bicarbonate is 2, add water to the drum reactor, water The mass is 20% of the sum of the mass of silicic acid gel and sodium silicate, the temperature is raised to 40°C, the drum reactor is turned on and mixed for 1 hour, and the insoluble impurities are separated by filtration to obtain a clear liquid;

[0021] 3) Send the clear liquid into the precipitation reaction kettle, add sodium dodecylbenzenesulfonate dispersant, the amount of sodium dodecy...

Embodiment 2

[0023] 1) Put silicon tetrachloride into the hydrolysis reactor, carry out the hydrolysis reaction at 50°C and normal pressure for 2 hours, filter the silicic acid gel and send it to the drum reactor, and HCl gas passes through the primary and secondary acid recovery kettles Water is absorbed and made into hydrochloric acid for subsequent use;

[0024] 2) Add sodium bicarbonate to the drum reactor from the feeding tank, control the mass ratio of silicic acid gel and sodium bicarbonate to 1:1, so that the alkali modulus of sodium bicarbonate is 3, add water to the drum reactor, water The mass is 50% of the sum of the mass of silicic acid gel and sodium naphthalene, the temperature is raised to 60°C, the drum reactor is turned on for a mixed reaction for 2 hours, and the insoluble impurities are separated by filtration to obtain a clear liquid;

[0025] 3) Send the clear liquid into the precipitation reaction kettle, add sodium dodecylbenzenesulfonate dispersant, the amount of s...

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Abstract

A method for preparing white carbon black from polysilicon byproduct silicon tetrachloride comprises the following steps: introducing silicon tetrachloride into a hydrolysis reaction kettle to conduct hydrolysis reaction and to obtain silicagel and HC1 gas; adding silicagel and sodium silicate into a rotary drum reactor, then adding water to the rotary drum reactor, starting the rotary drum reactor for mixing reaction, separating insoluble impurities, and obtaining clear solution; introducing the clear solution into a precipitation reaction kettle, adding sodium dodecylbenzene sulfonate dispersing agent, adjusting pH value to 8-9, after curing, continuously adjusting pH value to 3.0-5.0, ageing, water washing excessive acid solution, filtering and separating to obtain white carbon black with physical crystal water, then drying and grinding to obtain the product. The invention can most effectively utilize silicagel, has short technical process, relatively simple production equipment and technical operation and can realize industrialized production easily. The white carbon black obtained by the method provided by the invention has high viscosity and intensity, good heat resistance and acid resistance, and other indexes thereof can reach the technical requirement.

Description

technical field [0001] The invention relates to a method for preparing white carbon black from silicon, in particular to a method for preparing white carbon black by utilizing polycrystalline silicon by-product silicon tetrachloride. Background technique [0002] Polysilicon is the main raw material required by the electronics industry and the photovoltaic industry. However, the production of polysilicon produces large amounts of silicon tetrachloride. Silicon tetrachloride is a highly toxic substance, which has a strong irritant effect on the eyes and upper respiratory tract, and seriously pollutes the environment. Therefore, how to effectively use silicon tetrachloride to turn waste into treasure, improve polysilicon production capacity, and realize sustainable polysilicon industry has become a hot topic for enterprises and scholars in recent years. At present, the relatively mature silicon tetrachloride processing technology is as follows: 1. Convert silicon tetrachlori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 许晓光
Owner 安徽祥源科技股份有限公司
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