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Preparation method of silica powder and silica powder

A technology of silica powder and silica, which is applied in the direction of silica, silica, etc., can solve problems such as harsh reaction conditions, and achieve the effects of adjustable pore structure, high dispersion, and high purity

Active Publication Date: 2019-08-23
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction conditions of this method are harsh, and the reaction can only be carried out in concentrated hydrochloric acid, and a large amount of dilute hydrochloric acid will be generated during the precipitation washing process to be disposed of.

Method used

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  • Preparation method of silica powder and silica powder
  • Preparation method of silica powder and silica powder
  • Preparation method of silica powder and silica powder

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] Experimental procedure without adding surfactant:

[0033] First add deionized water into the reactor with a stirring device, then dissolve a certain amount of KF and add it into the reactor, start stirring, heat the above-mentioned fluorine-containing aqueous solution to the required temperature, and then use a metering pump to pump a certain amount of KF into the reactor. Silicon tetrachloride is added in the reactor at a certain speed, and the stirring is continued. After the reaction is over, the silica precipitate is filtered and washed by a centrifuge. After no chlorine ions and fluoride ions are detected in the filtrate, the washing is stopped and the The silica filter cake is put into an oven for drying to obtain a silica powder product with well-developed medium and large pores.

[0034] For the flow chart of the test, see figure 1 shown.

example 2

[0036] Experimental steps for adding surfactants:

[0037] First add deionized water, polyvinylpyrrolidone and KF into the reactor with stirring device, start stirring, heat the above-mentioned fluorine-containing aqueous solution containing surfactant to the required temperature, and then use a metering pump to pump a certain amount of tetrachloride Silicon is added to the reactor at a certain speed, and the stirring is continued. After the reaction is completed, the silica precipitate is filtered and washed with a plate and frame filter press. When no chloride ions and fluoride ions are detected in the filtrate, the washing is stopped. The method of spray drying dries the silica filter cake to obtain a silica powder product with high dispersion and well-developed micropores.

[0038] Specific example 1:

[0039] Add 1L of deionized water into a 2L tank reactor, dissolve 20g of KF in deionized water, add it to the reactor, stir and heat up to 40°C, and add silicon tetrachlor...

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Abstract

The invention relates to a silica powder preparation method, wherein the preparation method comprises the following steps: providing a solution containing fluorine ions and halide of silicon; adding the halide of silicon to the solution containing the fluorine ions, and producing a silica precipitate and obtaining a suspension containing the silica precipitate; filtering the suspension containing the silica precipitate, and washing the obtained silica precipitate, to obtain a silica filter cake; and drying the silica filter cake to obtain the silica powder. In addition, the invention also provides the silica powder prepared by the method.

Description

technical field [0001] The invention relates to the technical field of silicon dioxide, in particular to a method for preparing silicon dioxide powder and the silicon dioxide powder. Background technique [0002] Using water glass as raw material to prepare silica is a common method for domestic production of silica by precipitation. The silicate solution formed by dissolving water glass is usually a polysilicate solution, and its properties have a great influence on the performance of the final product silica. Big. In contrast, silicon tetrachloride is used as a raw material to prepare silicon dioxide. Silicon tetrachloride exists in a molecular state, and the product quality is easy to control and the product is of high purity. Therefore, silicon tetrachloride is used as a raw material to prepare di High-performance silicon dioxide can be obtained from silicon oxide, but this method requires the vaporization of silicon tetrachloride and water vapor, which is complicated i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18
Inventor 张香兰景允伸
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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