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[Chemical Knowledge]：The production and manufacturing method and process of raw salt.

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The manufacturing method
of raw salt is
in the field of raw materials for chemical production. Raw salt is an important basic raw material and is widely used in chlor-alkali industry, soda ash industry, yellow phosphorus industry, smelting industry, food industry and other fields. This article will introduce the manufacturing method of raw salt, including raw material selection, salt, evaporation, crystallization, drying and other process steps, as well as the matters needing attention in the production process.

1. raw material selection

raw salt is the main raw material of seawater, salt lake brine or underground brine and other rich salt resources of natural water bodies. When selecting raw materials, it is necessary to consider factors such as salt composition, impurity content, water quality pH value, etc. to ensure the quality and purity of raw salt.

2. salt

salt is the process of converting the salts in the raw material into soluble salts. The lime-soda ash method or ammonia-soda method is usually used for salt conversion. Among them, the lime-soda ash method is to add lime and soda ash to the raw materials according to a certain proportion, so that it reacts with magnesium ions, calcium ions and other impurity ions to form precipitation, so as to obtain pure soluble salt. The ammonia-alkali method is the use of ammonia and raw materials in the salt and carbon dioxide reaction, the formation of soluble bicarbonate and insoluble calcium and magnesium precipitation, to achieve the purpose of salt.

the soluble salt solution obtained after the

salt by evaporation 3. needs to be concentrated by evaporation to improve the concentration and purity of the salt. Evaporation generally uses a multi-effect evaporation process, that is, multiple evaporators are operated in series, and the secondary steam generated by the previous effect evaporator is used as the heating heat source of the next effect evaporator, thereby improving the utilization rate of heat energy. In the evaporation process, it is necessary to control parameters such as evaporation temperature, pressure and liquid level to ensure product quality and production safety.

4. crystallization

evaporation The concentrated salt solution needs to enter the crystallizer for crystallization to obtain solid crude salt. During the crystallization process, it is necessary to control the crystallization temperature and crystallization time to promote the growth and purification of salt crystals. At the same time, the crystallizer needs to be cleaned and maintained regularly to avoid problems such as scaling and corrosion.
the raw salt obtained
5. drying

crystallization contains a certain amount of water and needs to be dried to meet the requirements of storage and transportation. Drying generally uses fluidized bed dryer or rotary kiln dryer and other equipment, through hot air or flue gas and other heat sources to evaporate the water in the raw salt. In the drying process, it is necessary to control parameters such as drying temperature, wind speed and drying time to ensure product quality and production efficiency.
Precautions for
6.

In the manufacturing process of raw salt, the following matters need to be paid attention to:

1. Strictly control the quality and chemical composition of raw materials to ensure product purity and quality stability;
2. Strengthen equipment maintenance and maintenance, Regularly clean and replace wearing parts to ensure the normal operation of equipment and production safety;
3. Strengthen quality monitoring and data analysis in the production process, timely identify and solve production problems;
comply with environmental regulations and safety production requirements, to ensure that the production process of waste and by-products are properly treated and utilized.

In short, the manufacturing method of raw salt involves multiple process steps and links, and the process parameters and operating requirements of each link need to be strictly controlled to ensure product quality and production efficiency. At the same time, it is also necessary to strengthen production management and technological innovation, and continuously improve the technical level and economic benefits of raw salt manufacturing.

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