Manufacturing method of trisodium phosphate
I. Overview
Trisodium phosphate is an important inorganic salt chemical, 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 cost. 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: choose high-grade phosphate rock, after crushing, grinding, screening and other processes to make phosphate rock powder.
2. Soda ash: choose high quality soda ash to ensure its low impurity content, which is conducive to improving the product quality of trisodium phosphate.
3. Reaction process
1. Acid digestion reaction: phosphorite powder is reacted with sulfuric acid to produce phosphoric acid. During the reaction process, it is necessary to control the adding speed of sulfuric acid and the reaction temperature to ensure that the phosphate powder is fully reacted.
2. Neutralization reaction: The generated phosphoric acid is neutralized with soda ash to produce trisodium phosphate. This process needs to control the pH value in the appropriate range to ensure the quality and yield of the generated trisodium phosphate.
Four, post-processing
1. Filtration: the reaction solution is filtered to remove unreacted phosphate powder and impurities.
2. Crystallization: The filtered filtrate is subjected to crystallization operation to obtain trisodium phosphate crystals. Temperature and concentration should be controlled during the crystallization process to improve the quality and yield of the crystals.
3. Drying: The crystallized trisodium phosphate crystals are dried to obtain the final trisodium phosphate product. V. Product quality control
1. Physical and chemical index test: the trisodium phosphate products are tested for physical and chemical indexes, such as purity, whiteness, particle size, etc., to ensure that the product quality meets the relevant standards.
2. Heavy metal content test: test the heavy metal content in the products to ensure the safety of the products.
3. Packaging and storage: Pack the qualified trisodium phosphate products according to the requirements and store them in a dry, cool and ventilated warehouse, avoiding direct sunlight and high temperature environment.
VI. Precautions in the production process
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 the 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 repair of the equipment in the production process, reduce the downtime and improve the operation rate of the equipment.
4. Emphasize the environmental health and safety management of the production site to ensure that the production process is safe and environmentally friendly.
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 control of raw materials and equipment maintenance. At the same time, pay attention to the environmental health and safety management of the production site to ensure that the production process is safe and environmentally friendly. Through the implementation of the above measures, high quality trisodium phosphate products can be produced to meet the needs of different industrial fields.
