Preparation method of silicon dioxide

A silicon dioxide and hydrogen peroxide technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problem of low dispersion

Inactive Publication Date: 2021-05-18
GET GREEN ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the problem that the silica prepared by the existing precipitation method will produce a large amount of gel and cause low dispersion, the applicant of this case first thought of a novel preparation method of silica to obtain highly dispersed silica. Silicon oxide

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  • Preparation method of silicon dioxide

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[0017] The preparation method of silicon dioxide of the present invention comprises the aforementioned step (1), step (2) and step (3).

[0018] [step 1)]

[0019] This step (1) is to provide a sodium silicate aqueous solution.

[0020] This sodium silicate aqueous solution contains sodium silicate and water.

[0021] Preferably, the sodium silicate aqueous solution is prepared by mixing sodium silicate and water and stirring. In a specific example of the present invention, the sodium silicate aqueous solution is prepared by mixing sodium silicate and water, heating and stirring.

[0022] Preferably, the above heating and stirring temperature ranges from 80°C to 95°C. More preferably, the temperature range is 90°C to 95°C.

[0023] [step (2)]

[0024] The step (2) is to react the sodium silicate aqueous solution with an acid mixture under an environment with a pH value greater than 7 to obtain a reaction solution, wherein the acid mixture contains sulfuric acid and hydrog...

Embodiment 1

[0041] The silica of embodiment 1 is made by following steps:

[0042] Step (1): 125g aqueous sodium silicate (Na 2 O·xSiO 2 ·nH 2 O; Na 2 O:9.23wt%, SiO 2 : 28.23wt%) and 3076g water were stirred and mixed (300rpm rotating speed) and the temperature was raised to 92°C to obtain a sodium silicate aqueous solution.

[0043] Step (2): Mix 372.5 g of acid mixture (containing sulfuric acid, hydrogen peroxide and water) with the aqueous sodium silicate solution obtained in step (1), and stir for 30 minutes to react to obtain a reaction liquid. In this step, based on the total weight of the acid mixture as 100wt%, the weight of sulfuric acid is 50wt%, the weight of hydrogen peroxide is 6wt%, and the temperature during the reaction is controlled at 92°C, and the pH is controlled at 7.8-8.2 During this period, the acid mixture was fed in 31 minutes, and the sodium silicate aqueous solution was fed in 24 minutes.

[0044] Step (3): Add 32.5g of acid mixture to reduce the pH value o...

Embodiment 2

[0047] The preparation method of embodiment 2 is similar to embodiment 1, and its difference is that step (2) and step (3) of embodiment 2 are as follows:

[0048] Step (2): Mix 313.5 g of acid mixture (containing sulfuric acid and hydrogen peroxide) with the aqueous sodium silicate solution obtained in step (1), and stir for 30 minutes to react to obtain a reaction liquid. In this step, based on the total weight of the acid mixture as 100wt%, the weight of sulfuric acid is 60wt%, and the weight of hydrogen peroxide is 4wt%, and the temperature during the reaction is controlled at 89 ° C, and the pH is controlled at 7.8 to 8.2 During this period, the acid mixture was fed in 30 minutes, and the sodium silicate aqueous solution was fed in 23 minutes.

[0049] Step (3): add 28.0g of acid mixed solution to reduce the pH value of the reaction solution obtained in step (2) to 4, and then react the reaction solution with a pH value of 4 at 91° C. for 1 hour to obtain two Silica solu...

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Abstract

A preparation method of silicon dioxide comprises the following steps: (1) providing a sodium silicate aqueous solution; (2) reacting the sodium silicate aqueous solution with an acid mixed solution containing sulfuric acid and hydrogen peroxide in an environment with a pH value of greater than 7 to obtain a reaction solution; and (3) enabling the reaction solution to react in an environment with the pH value not higher than 4.5 to obtain the silicon dioxide, wherein the pH value is adjusted to be not higher than 4.5 by adding the acid mixed solution. The silicon dioxide prepared by the preparation method disclosed by the invention has relatively high dispersity.

Description

technical field [0001] The invention relates to a method for preparing silicon dioxide, in particular to a method for preparing silicon dioxide using sodium silicate as a silicon source. Background technique [0002] There are many methods for preparing silicon dioxide, and gas phase method and precipitation method are common preparation processes. The gas phase method generally involves the combustion reaction of silicon tetrachloride at a high temperature (greater than 1000°C). Compared with the precipitation method, the silicon dioxide produced in the process has good chemical purity, reinforcing properties and thixotropy; although the gas phase The French process has the aforementioned advantages and does not require water removal, but the accompanying environmental protection equipment and complex preparation process make the price of silica produced by the gas phase method relatively high, so the industry still tends to use the precipitation method to prepare silica. ...

Claims

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Application Information

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IPC IPC(8): C01B33/193
CPCC01B33/193C01P2006/22
Inventor 李协昱刘信利叶鉴毅
Owner GET GREEN ENERGY CORP
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