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[Chemical Knowledge]：The production and manufacturing method and process flow of sulfide alkali.

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The manufacturing method
of alkali sulfide
1. Introduction

alkali sulfide is an important inorganic chemical, widely used in metallurgy, papermaking, printing and dyeing, leather, ceramics and other industries. With the continuous development of science and technology, the manufacturing method of sulfide alkali is also constantly improved and optimized. This article will introduce a common alkali sulfide manufacturing method.

2. raw materials and equipment

1. raw materials: sodium hydroxide, sulfur, water.
2. Equipment: reaction kettle, stirrer, thermometer, condenser, filter, etc.

3. manufacturing steps

1. Add sodium hydroxide and water to the reaction kettle according to a certain proportion, and stir evenly.
2. Heat the reaction kettle to a certain temperature to completely dissolve the sodium hydroxide.
3. Slowly add sulfur while maintaining stirring to allow the sulfur to fully react with the sodium hydroxide solution.
4. Continue heating and maintain stirring to complete the reaction.
5. The reactor is cooled, and unreacted impurities are filtered off to obtain an alkali sulfide solution.
6. The alkali sulfide solution is concentrated, crystallized and dried to obtain the final alkali sulfide product.

4. Precautions

1. Control the reaction temperature and feeding speed to avoid local overheating and uneven reaction.
2. Keep stirring to prevent material deposition and bonding.
3. When filtering, select the appropriate filter material to avoid product loss and filter residue.
4. Control the temperature and humidity when drying to avoid product agglomeration and deterioration.

5. Conclusion The manufacturing method of

alkali sulfide involves many links and precautions, and the reaction conditions and operation process need to be strictly controlled to ensure product quality and production safety. Through the manufacturing method introduced in this article, high-quality sulfide alkali products can be produced to meet the needs of different fields.

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