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[Chemical Knowledge]：Production and manufacturing method and process flow of aluminum fluoride

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The manufacturing method
of aluminum fluoride
1. Introduction

Aluminum fluoride is an important inorganic fluoride with a wide range of applications. In the field of chemical production raw materials, aluminum fluoride is mainly used for smelting aluminum and other metals flux, ceramic industry sintering agent, as well as for the manufacture of other fluoride. Therefore, it is of great significance to study the manufacturing method of aluminum fluoride for improving production efficiency, reducing costs and improving product quality.

2. the properties and uses of aluminum fluoride

aluminum fluoride is a white or slightly gray crystalline powder, odorless, highly chemically stable, insoluble in water, but decomposes in acidic solutions. Aluminum fluoride is mainly used for smelting aluminum and other metal flux, ceramic industry sintering agent, as well as for the manufacture of other fluoride.

3. aluminum fluoride manufacturing method

1. aluminum hydroxide
aluminum hydroxide method is the main method of production of aluminum fluoride at home and abroad. The method is to react aluminum hydroxide with anhydrous hydrofluoric acid to produce aluminum fluoride and water. The reaction equation is as follows:

Al(OH)3 3HF → AlF3 3 H2O

This method has the advantages of simple process, convenient operation and high product quality, but the production cost is high.

2. fluosilicic acid method
fluosilicic acid method is the reaction of fluosilicic acid with aluminum oxide or aluminum hydroxide to generate aluminum fluoride and silicic acid. The reaction equation is as follows:

6HF SiO2 2Al(OH)3 → 2AlF3 3H2O SiF4

This method has the advantages of easy availability of raw materials and low cost, but the product quality is not as good as the aluminum hydroxide method, and measures need to be taken to improve the product quality.

4. aluminum fluoride production process

No matter which method is used, the production process of aluminum fluoride mainly includes raw material treatment, reaction, separation, drying, packaging and other processes. The following is an example of aluminum hydroxide method to introduce the production process of aluminum fluoride.

1. raw material processing
aluminum hydroxide and anhydrous hydrofluoric acid according to a certain proportion into the reaction kettle, stirring evenly.

2. the reaction
is heated and stirred in a reaction kettle to fully react aluminum hydroxide with anhydrous hydrofluoric acid to generate aluminum fluoride and water. The temperature and pH value should be controlled during the reaction to ensure the smooth progress of the reaction.

3. Separation and
After the reaction is completed, the reaction solution is allowed to settle, and the aluminum fluoride precipitate at the bottom and the acidic wastewater at the upper layer are separated.

4. Drying
The separated aluminum fluoride precipitate is dried to obtain a dried aluminum fluoride product.

5. Packaging
The dried aluminum fluoride product is packaged to obtain the final aluminum fluoride product.

5. conclusion

aluminum fluoride as an important inorganic fluoride, has a wide range of applications in the field of chemical production raw materials. Aluminum hydroxide method and fluosilicic acid method are commonly used manufacturing methods, different methods have different advantages and disadvantages and scope of application. In actual production, appropriate manufacturing methods and production processes should be selected according to specific conditions to improve production efficiency, reduce costs, and improve product quality.

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