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[Chemical Knowledge]：Production and manufacturing method and process of sodium stannate

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The manufacturing method

of sodium stannate Sodium stannate is an important inorganic chemical raw material, which is widely used in glass, ceramics, electroplating, printing and dyeing industries. This article will introduce the manufacturing method of sodium stannate, including raw material preparation, reaction process, post-treatment and so on.

1. Raw Material Preparation

The main raw materials for the manufacture of sodium stannate are tin and sodium hydroxide. Tin can be used as metal tin or tin oxide, and sodium hydroxide can be used as industrial grade sodium hydroxide solid or aqueous solution. In addition, a certain amount of water is required as a reaction medium.

2. Reaction Process
The manufacturing process of
sodium stannate is a chemical reaction process. The main reaction equation is:

Sn 2NaOH H2O → Na2SnO3 2H2 ↑

The specific reaction process is as follows:

1. Cut metal tin into small pieces and add them to the reaction kettle.

2. Add a certain amount of water to completely immerse the tin in the water.

3. Add solid or aqueous sodium hydroxide to the kettle and adjust the pH to between 10 and 12.

4. Heat the reaction kettle, control the reaction temperature between 80-100 ℃, maintain a certain period of time, so that tin and sodium hydroxide fully react.

5. During the reaction, constant stirring is required to promote the uniform progress of the reaction.

6. After completion of the reaction, unreacted tin slag and impurities were filtered off to obtain a sodium stannate solution.

3. post-treatment

In order to obtain a pure sodium stannate product, further treatment of the sodium stannate solution is required. The specific steps are as follows:

1 to add a certain amount of activated carbon to the sodium stannate solution, adsorption solution of organic impurities and pigments.

2. The activated carbon and impurities were filtered off to give a clear sodium stannate solution.

3 The sodium stannate solution was concentrated to obtain sodium stannate crystals.

4. sodium stannate crystals were centrifuged and washed with water to obtain pure sodium stannate product.

4. precautions

1. In the reaction process, the reaction temperature and pH value should be controlled to avoid excessive temperature and acidity to cause corrosion and loss of equipment.

2. In the post-processing process, attention should be paid to the amount of activated carbon and the filtering effect to ensure the purity and color of the product.

3. In the production process, safety production specifications should be followed to avoid personal injury and environmental pollution.

In short, the manufacturing method of sodium stannate includes raw material preparation, reaction process and post-treatment. It is necessary to strictly control the reaction conditions and operation process to ensure the quality and purity of the product. At the same time, pay attention to safety and environmental protection in the production process, and comply with relevant laws, regulations and standards.

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