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Preparation method of silicon dioxide

A silicon dioxide and carbon dioxide technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of too small, uneven particle size distribution, large particle size, etc., to achieve uniform particle size distribution, suitable particle size, reduce The effect of fine powder content

Active Publication Date: 2015-03-18
QUECHEN SILICON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems in the prior art that the particle size of the produced silica particles is too large (large aggregates) or too small (fine powder), and the particle size distribution is uneven, the present invention proposes a method for preparing silica method, which includes:

Method used

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  • Preparation method of silicon dioxide

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Embodiment 1

[0029] Embodiment 1: the preparation of silica S1

[0030] 1) Dissolving: such as figure 1 As shown in S102, solid sodium silicate (Anhui Quecheng Silicon Chemical Co., Ltd.: solid-2 type) and water are added to the dissolving static autoclave at a mass ratio of 2:1, and water vapor with a pressure of 0.4Mpa is introduced. Fully dissolve for 1.5 hours, filter out the precipitate with a filter press to obtain a transparent and impurity-free concentrated liquid sodium silicate, and its density (20°C) is 1.1g / cm 3 ;

[0031] Among them, in solid sodium silicate, SiO 2 / Na 2 The weight ratio of O is 3.35;

[0032] 2) Adjustment: such as figure 1 Shown in S104 among, add water in the concentrated liquid sodium silicate obtained by step 1), to adjust wherein Na 2 O nSiO 2 The concentration to 2.20mol / l obtains dilute liquid sodium silicate;

[0033] 3) Synthesis: 3-1) Purify the hot blast stove tail gas into a process gas with a carbon dioxide concentration of 35% (in volume...

Embodiment 2

[0043] Embodiment 2: the preparation of silica S2

[0044] 1) Dissolving: such as figure 2 As shown in S202, solid sodium silicate (Anhui Quecheng Silicon Chemical Co., Ltd.: solid-2 type) and water are added to the dissolving static autoclave at a mass ratio of 2:1, and water vapor with a pressure of 0.4Mpa is introduced. Fully dissolve for 2.0 hours, filter out the precipitate with a filter press to obtain a transparent and impurity-free concentrated liquid sodium silicate, and its density (20°C) is 1.3g / cm 3 ;

[0045] Among them, in solid sodium silicate, SiO 2 / Na 2 The weight ratio of O is 3.40;

[0046] 2) Adjustment: such as figure 2 Shown in S204 among, add water in the thick liquid sodium silicate obtained by step 1), to adjust wherein Na 2 O nSiO 2 The concentration to 2.35mol / l obtains dilute liquid sodium silicate;

[0047] 3) Synthesis: 3-1) Purify the hot blast stove tail gas into a process gas with a carbon dioxide concentration of 40% (by volume perc...

Embodiment 3

[0057] Embodiment 3: the preparation of silica S3

[0058] 1) Dissolving: such as image 3 As shown in S302, solid sodium silicate (Anhui Quecheng Silicon Chemical Co., Ltd.: solid-2 type) and water are added to the dissolving static autoclave at a mass ratio of 2:1, and water vapor with a pressure of 0.4Mpa is introduced. Fully dissolve for 2.2 hours, filter out the precipitate with a filter press to obtain a transparent and impurity-free concentrated liquid sodium silicate, and its density (20°C) is 1.2g / cm 3 ;

[0059] Among them, in solid sodium silicate, SiO 2 / Na 2 The weight ratio of O is 3.34;

[0060] 2) Adjustment: such as image 3 Shown in S304 among, add water in the concentrated liquid sodium silicate obtained by step 1), to adjust wherein Na 2 O nSiO 2 The concentration to 2.37mol / l obtains dilute liquid sodium silicate;

[0061] 3) Synthesis: 3-1) Purify the hot blast stove tail gas into a process gas with a carbon dioxide concentration of 38% (by volume...

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Abstract

The invention provides a preparation method of silicon dioxide, namely, method for preparing the silicon dioxide by carbon dioxide method, and the method comprises the following steps: process gas bubbles with uniform diameter are dispersed into a sodium silicon solution for reaction of the sodium silicon solution and carbon dioxide to produce silicon dioxide slurry, wherein the process gas contains carbon dioxide; the silicon dioxide slurry is filtered to obtain filtrate; the filtrate is pulpified to obtain silicon dioxide pulp liquid; and the silicon dioxide pulp liquid is dried. Silicon dioxide particles prepared by the method are proper in particle size and uniform in particle size distribution, the number of large aggregates is decreased significantly and the content of fine powder is greatly reduced. In addition, initial gas containing carbon dioxide is purified to obtain the process gas with high concentration of carbon dioxide, the process gas with high concentration of carbon dioxide is used as a reaction raw material, the production cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for preparing silicon dioxide. Background technique [0002] Hydrated silica is commonly known as white carbon black, and its molecular formula is SiO 2 ·nH 2 O, the appearance is powdery, microbead, granular, and silica is a widely used material for rubber reinforcement. Generally speaking, the reinforcing effect of silica (except for ultrafine and surface treatment) is not as good as that of carbon Black is good, so it is a semi-reinforcing filling material. Therefore, the percentage of replacing carbon black should be determined according to the application occasion. Precipitated silica is used in rubber products such as inner and outer tires of automobiles, dump trucks, trucks, tractors, forklifts, bicycles, etc., industrial belts, hoses, gaskets, rubber sheets, threshing rubber rollers for grain processing, and rubber shoes. Silica is more or less us...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 王永庆阙伟东初亮
Owner QUECHEN SILICON CHEM
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