Manufacturing method of sodium stannate
Sodium stannate is an important inorganic chemical raw material, 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.
I. Raw material preparation
The main raw materials for manufacturing sodium stannate are tin and sodium hydroxide. Tin can be metal tin or tin oxide, and sodium hydroxide can be industrial grade sodium hydroxide solid or aqueous solution. In addition, a certain amount of water is required as the reaction medium.
II. Reaction process
The manufacturing process of sodium stannate is a chemical reaction process, and the main reaction equation is as follows:
Sn + 2NaOH + H2O → Na2SnO3 + 2H2↑
The specific reaction process is as follows:
1. Cut the metal tin into small pieces, and add them to the reactor.
2. Add a certain amount of water so that the tin pieces are completely submerged in the water.
3. Add sodium hydroxide solid or aqueous solution to the reaction kettle and adjust the pH to between 10-12.
4. Heat the reactor, control the reaction temperature between 80-100°C, and keep it for a certain period of time, so that the tin and sodium hydroxide can fully react.
5. Stirring is required during the reaction to promote the uniformity of the reaction.
6. After the end of the reaction, filter off the unreacted tin residue and impurities to obtain sodium stannate solution.
III. Post-treatment
In order to obtain a pure sodium stannate product, further treatment of sodium stannate solution is required. The specific steps are as follows:
1. Add a certain amount of activated carbon to the sodium stannate solution to adsorb the organic impurities and pigments in the solution.
2. Filter out the activated carbon and impurities to obtain a clarified sodium stannate solution.
3. The sodium stannate solution is concentrated to obtain sodium stannate crystals.
4. Centrifuge the sodium stannate crystals and wash them with water to get pure sodium stannate product.
4. Precautions
1. During the reaction process, the reaction temperature and pH value should be controlled to avoid corrosion and loss of equipment caused by too high temperature and acidity.
2. In the post-treatment process, attention should be paid to the dosage of activated carbon and filtration effect to ensure the purity and color of the product.
3. In the production process, safety production norms should be followed to avoid personnel injury and environmental pollution.
In conclusion, the manufacturing method of sodium stannate includes raw material preparation, reaction process and post-treatment, which requires strict control of reaction conditions and operation process to ensure the quality and purity of the product. At the same time, attention should be paid to safety and environmental protection in the production process, and comply with relevant laws, regulations and standard requirements.
