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[Chemical Knowledge]：Production and manufacturing method and process flow of precipitated white carbon black

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Manufacturing Method
of Precipitated Silica
Precipitated silica, also known as hydrated silica or silica gel, is made by reacting a silicate with an acid under alkaline conditions. It has the advantages of high dispersion, large specific surface area and high adsorption performance, so it has a wide range of applications in the field of chemical production raw materials. This paper will introduce the manufacturing method of precipitated silica in detail.

1. Raw Material Preparation

1. Silicate: Sodium silicate is usually used as the silicate raw material. Sodium silicate can be made by dissolving quartz sand or natural silica.
2. Acid: Commonly used acids include sulfuric acid, hydrochloric acid, etc., which are used to react with silicates to produce white carbon black.
3. Water: used to prepare silicate and acid solutions, and to wash and dry silica products.

2. manufacturing process

precipitated white carbon black manufacturing process mainly includes the following steps:

1 preparation of silicate solution: sodium silicate and other silicate raw materials added to the water, prepared into a certain concentration of silicate solution.
2. Preparation of acid solution: add acid such as sulfuric acid or hydrochloric acid into water to prepare an acid solution with a certain concentration.
3. Precipitation reaction: the silicate solution is mixed with the acid solution to make the two react and generate white carbon black precipitate. The pH value, temperature, stirring speed and other parameters need to be controlled in the reaction process to ensure that the silica produced has excellent performance.
4. Washing: The resulting silica precipitate was washed several times with water to remove residual salts and impurities.
5. Drying: The washed silica precipitate is dried to obtain the final precipitated silica product.

3. Precautions

1. pH control: In the precipitation reaction, it is necessary to strictly control the pH value to ensure that the generated silica has a suitable particle size and specific surface area.
2. Control temperature and stirring speed: The reaction temperature and stirring speed will affect the generation speed and particle size distribution of silica, so it needs to be adjusted according to the actual situation.
3. Washing and drying: The purity and particle size distribution of the product need to be ensured during the washing and drying process to avoid the performance of the product being affected.

4. Application

Precipitated silica has a wide range of applications, including the following aspects:

1. Rubber industry: Precipitated silica can be used as a reinforcing agent for rubber to improve the mechanical properties and wear resistance of rubber.
2. Coating industry: Precipitated silica can be used as a filler for coatings to improve the leveling, anti-settling and weather resistance of coatings.
3. Ceramic industry: Precipitated silica can be used to prepare ceramic materials to improve the density and mechanical properties of ceramics.
4. Food industry: Precipitated silica can be used as a food additive for making candy, chocolate and other foods to improve the taste and texture of food.

In conclusion, precipitated silica as an important raw material for chemical production has broad application prospects. By mastering its manufacturing method, silica products with excellent performance can be produced to provide support for applications in various fields.

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