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[Chemical Knowledge]：Manufacturing method and process of silicon dioxide

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The manufacturing method
of silica
1. Introduction

Silica is an important inorganic chemical product, which is widely used in ceramics, glass, rubber, plastics, coatings, food additives and other fields. Due to its unique physical and chemical properties, silica plays an important role in the field of chemical production raw materials. This article will introduce the manufacturing methods of silica, including precipitation method, sol-gel method, gas phase method, etc.

2. precipitation method

precipitation method is one of the common methods for preparing silica. In this method, silica is obtained by reacting a silicate solution with an acid or alkaline absorbent to precipitate silicate ions in the silicate. The specific steps are as follows:

1. the silicate solution is mixed with an acid or alkaline absorbent to react the silicate ions in the silicate to generate silicic acid precipitate.
2. The silicic acid precipitate is washed, filtered and dried to obtain the silica product. The advantages of

precipitation method are simple process and low cost, but the resulting product has low purity and large particles, which requires further processing.

3. Sol-gel method

Sol-gel method is a method for preparing high-purity, ultrafine silica. In this method, the silicate solution is hydrolyzed and condensed to form a sol, which is then subjected to the steps of gelation, drying and calcination to obtain silica. The specific steps are as follows:

1. adding silicate solution to water, and hydrolyzing to generate silicic acid sol.
2. Add acid or alkaline catalyst to promote the condensation reaction of sol and form gel.
3. The gel is dried and calcined to obtain the silica product. The advantages of

sol-gel method are high purity and fine particles, but the process is more complex and the cost is higher.

4. gas phase method

gas phase method is a preparation of high purity, special form of silica. In this method, silicon dioxide is produced by oxidizing a silicon-containing gas such as silicon tetrachloride at a high temperature. The specific steps are as follows:

1. introducing silicon-containing gas such as silicon tetrachloride into a high-temperature combustion chamber.
2. Into oxygen or air and other oxidizing agents, the silicon-containing gas oxidation reaction at high temperature to generate silicon dioxide.
3. Through the steps of cooling, collecting, etc., a silica product is obtained. The advantages of

gas phase method are high purity of the product and controllable particle form, but the equipment investment is large and the production cost is high.

5. Conclusion There are many methods for manufacturing

silica, including precipitation method, sol-gel method, gas phase method, etc. The purity, particle size and morphology of the products obtained by different methods are different, and the suitable manufacturing method should be selected according to the specific application field. In the future, with the continuous progress of science and technology and the improvement of environmental protection requirements, the manufacturing method of silica will be continuously optimized and improved.

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