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[Chemical Knowledge]：Manufacturing method and process of trisodium phosphate

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1. overview of the manufacturing method
of trisodium phosphate

trisodium phosphate is an important inorganic salt chemicals, widely used in food, medicine, printing and dyeing, metallurgy, ceramics and other industrial fields. As a raw material for chemical production, the manufacturing method of trisodium phosphate is of great significance for improving product quality and reducing production costs. This paper will introduce the manufacturing method of trisodium phosphate in detail, including raw material preparation, reaction process, post-treatment and product quality control.

2. Raw material preparation

1. Phosphate rock: select high-grade phosphate rock, through crushing, grinding, screening and other processes into phosphate rock powder.
2. soda ash: high quality soda ash is selected to ensure its low impurity content, which is beneficial to improve the product quality of trisodium phosphate.

3. reaction process

1. acidolysis reaction: phosphate rock powder reacts with sulfuric acid to generate phosphoric acid. In the reaction process, the addition rate and reaction temperature of sulfuric acid should be controlled to ensure the full reaction of phosphate rock powder.
2. Neutralization reaction: The generated phosphoric acid and soda ash are neutralized to generate trisodium phosphate. This process needs to control the pH value within the appropriate range to ensure the quality and yield of trisodium phosphate.

4. Post-treatment

1. Filtration: The reaction solution is filtered to remove unreacted phosphate rock powder and impurities.
2. Crystallization: The filtrate after filtration is subjected to a crystallization operation to obtain trisodium phosphate crystals. Temperature and concentration should be controlled during the crystallization process to improve the crystal quality and yield.
3. Drying: The crystallized trisodium phosphate crystals are dried to obtain the final trisodium phosphate product.

5. product quality control

1. physical and chemical index detection: physical and chemical index detection of the produced trisodium phosphate products, such as purity, whiteness, particle size, etc., to ensure that the product quality meets the relevant standards.
2. Heavy metal content detection: The heavy metal content in the product is detected to ensure product safety.
3. Packaging and storage: The qualified trisodium phosphate products shall be packaged as required and stored in a dry, cool and ventilated warehouse to avoid direct sunlight and high temperature environment.
Precautions in the production process of
6.

1. Strictly control the parameters of each reaction process, such as reaction temperature, pH value, etc., to ensure the smooth progress of the reaction and improve product quality and yield.
2. Strict quality control of raw materials to ensure that the purity and impurity content of raw materials meet the production requirements.
3. Strengthen the maintenance and maintenance of equipment in the production process, reduce downtime and improve equipment operation rate.
4. Pay attention to the environmental health and safety management of the production site to ensure the safety and environmental protection of the production process.

summary: The manufacturing method of trisodium phosphate involves raw material preparation, reaction process, post-treatment and product quality control. In order to improve product quality and reduce production costs, the production process needs to strictly control the process parameters, strengthen the quality of raw materials and equipment maintenance work. At the same time, pay attention to the environmental health and safety management of the production site to ensure the safety and environmental protection of the production process. Through the implementation of the above measures, high-quality trisodium phosphate products can be produced to meet the needs of different industrial fields.

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