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[Chemical Knowledge]：Manufacturing method and process of sodium chloride

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The manufacturing method
of sodium chloride
sodium chloride, the more well-known name in daily life is table salt, which is a substance widely used in the field of raw materials for chemical production. Its manufacturing methods are diverse, mainly depending on the source of raw materials and production process. This article will detail several main manufacturing methods of sodium chloride.

1. sea salt method

sea salt method is the oldest sodium chloride manufacturing method, mainly by seawater evaporation crystallization. First of all, it is necessary to select a clean sea area and introduce seawater into the evaporation pool through the pumping station. After the sunlight evaporates the water, the sodium chloride in the seawater will gradually crystallize out. The purity of sodium chloride obtained by this method is high, but it is greatly affected by weather and environmental factors.

2. rock salt method

rock salt method is to mine rock salt from underground salt mines, and then through crushing, washing, drying and other steps to obtain sodium chloride. The purity of sodium chloride obtained by this method is also very high, but the mining cost is relatively high.

3. chemical method

chemical method is to make sodium chloride through chemical reaction. One common method is to use hydrochloric acid and sodium hydroxide to produce sodium chloride and water. The advantage of this method is that large-scale production can be carried out according to the demand, and the purity can be controlled.

4. electrolysis

electrolysis is to produce sodium chloride by electrolysis of an aqueous solution of common salt. The sodium chloride in the salt solution is ionized under the action of the electric field, and then hydrogen and chlorine are precipitated on the cathode and anode respectively, and the rest is sodium chloride. The advantages of this method are continuous production and high purity.

above is the main manufacturing method of sodium chloride. In actual production, a suitable manufacturing method can be selected according to the source of raw materials, production cost, product purity and other factors. No matter which method

adopts, it is necessary to strictly abide by relevant production regulations and safety operation procedures to ensure product quality and production safety. At the same time, the waste and by-products produced in the production process also need to be treated and utilized reasonably to avoid environmental pollution.

In general, the manufacturing methods of sodium chloride are diverse, and each method has its own characteristics and scope of application. When choosing a manufacturing method, various factors need to be considered comprehensively to achieve a balance between economic and environmental benefits. In the future, with the advancement of science and technology and the improvement of environmental protection requirements, the manufacturing method of sodium chloride will continue to be improved and optimized to further improve product quality and production efficiency.

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