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Method of producing high-temperature silica flour body

A technology of silica and powder, which is applied in the field of high-temperature silica powder preparation, can solve the problems of high cost of high-temperature silica powder, and achieve environmental protection, high powder purity, and simple production process Effect

Inactive Publication Date: 2008-05-07
CHINA UNIV OF MINING & TECH (BEIJING) +1
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Problems solved by technology

[0004] In the electronic industry, the method of complete hydrolysis of ethyl silicate is commonly used to prepare high-purity and fine high-temperature silica powder. Since ethyl silicate is produced by organic synthesis, the cost of high-temperature silica powder prepared by this method is relatively low. high

Method used

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Embodiment Construction

[0008] The preparation method of the high-temperature powder silica described in the technical solution will be described in detail below through specific examples.

[0009] The method for preparing high-temperature powdered silicon dioxide described in the technical solution comprises the following steps:

[0010] (1) Provide alkaline solution and hydrohalosilane or hydrocarbyl halosilane.

[0011] Wherein, above-mentioned alkaline solution can be the hydroxide solution of alkali metal, alkaline earth metal, also can be the soluble aqueous solution of the carbonate of alkali metal, alkaline earth metal, bicarbonate, the oxo-salt of phosphorus, and ammoniacal water, partial aluminum salts and any combination of the above solutions. It can be understood that the above alkaline solution may be all alkaline solutions and salt solutions, or any combination thereof. The mass fraction of the solute in the above alkaline solution may be 2-30%. It can be understood that the mass fr...

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Abstract

The invention relates to a preparation method of high-temperature silicon dioxide powder, which comprises the following procedures that: an alkaline solution and hydrogen halosilane, alkyl halosilane, or silicon tetrachloride are provided; hydrogen halogen silane, alkyl halogen silane, or the mixture, or the mixture of silicon tetrachloride at any rate are put into the alkaline solution to generate silicic acid substance deposits and to obtain a suspending liquid containing silicic acid substance deposits; a filter cake of silicic acid substance deposits can be achieved by filtering the suspending liquid containing the silicic acid substance and washing the obtained silicic acid substance deposits; the silicic acid substance filter cake can be dried and baked to get the high-temperature silicon dioxide powder.

Description

technical field [0001] The invention relates to a preparation method of high-temperature silica powder. Background technique [0002] The preparation methods of silica powder mainly include gas phase method, sol-gel method, precipitation method, reverse micellar microemulsion method and so on. The gas phase method is to generate silicon dioxide by the gas phase reaction of silicon tetrachloride and water vapor. This process is complicated, the investment is high, and the product cost is high. The sol-gel method, the precipitation method, and the reverse micellar microemulsion method mainly use water glass as raw material and add acid to produce silica. Water glass is made of silicon-containing materials such as diatomite and quartz sand as raw materials, and is prepared by alkali melting. It has high energy consumption, high cost, complicated process control, and low purity and cannot be used in the electronics industry. [0003] Invention patent application publication 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
Inventor 张香兰寇志胜王向龙张燕
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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