1. Application in the chemical industry
Sodium chloride is the mother of the chemical industry. The chemical industry is the basic industry of the national economy. Three acids (sulfuric acid, hydrochloric acid, nitric acid) and two alkalis (soda ash, caustic soda) are the basic chemical industry. Among them, hydrochloric acid, soda ash, and caustic soda are produced with sodium chloride as the main raw material. Consumption of 1.2 to 1.4 tons of original sodium chloride, the world is used to produce sodium chloride, chlorine and chlorine derivatives and other more than 80 basic chemical products used in sodium chloride, accounting for more than 60% of the world's total sodium chloride consumption In developed countries, chemical sodium chloride generally accounts for more than 90% of the total sodium chloride consumption. Therefore, it can be said that the overall development of the national economy depends on the developed chemical industry, which in turn depends on the developed sodium chloride industry.
2. Application in the dye industry
The raw materials commonly used in the dye industry, such as caustic soda, soda ash and chlorine, are directly produced from sodium chloride. Hydrochloric acid, sodium sulfide, and sodium sulfide are chemical products made by deep processing of sodium chloride; in addition, a large amount of it is directly consumed Sodium chloride. Therefore, in addition to the chlor-alkali industry, the dye industry is one of the industries closely related to the sodium chloride industry. And almost every step in the dye production process consumes a certain amount of sodium chloride.
3. Application in metallurgical industry
Industrial salt is used as a chlorination roasting agent and quenching agent in the metallurgical industry, as well as a desulfurizing agent and clarifying agent for treating metal ores. Steel products and steel rolled products are immersed in sodium chloride solution to harden the surface and remove the oxide film. Sodium chloride is used in pickling of strip steel and stainless steel, aluminum smelting, electrolysis of sodium metal, etc., and sodium chloride is required for refractory materials in smelting.
4. Application in building materials industry
Soda ash made from sodium chloride is the main raw material for glass production.
General stoneware, ceramic tiles and jars need sodium chloride as a glazing agent.
In addition, the waste slag (salt gypsum) from the production of sodium chloride and the calcium-magnesium mud (salt mud) produced in brine purification can be used as building wallboards, wall materials or fillers, and can also be used as cement fillers.
5. Application in machinery industry
During casting, sodium chloride can be used as an excellent binder for non-ferrous metals and alloy casting medium sand.
During the heat treatment of steel mechanical parts or tools, the most commonly used heating equipment is a salt bath furnace. When ferrous metals, copper and copper alloys are subjected to strong pickling before electroplating, sodium chloride is required.
6. Application in the petroleum industry
In the process of oil well drilling, in order to protect the integrity of the rock salt formation core, it is necessary to add sodium chloride as a stabilizer in the mud, and barium sulfate, a chemical product of sodium chloride, to increase the weight of the drilling mud and act as a regulator.
7. Application in light industry
In soap making, sodium chloride is often added in order to maintain a proper viscosity of the solution.
The tanning industry requires a large amount of animal skins. During the storage and transportation of raw skins, in order to prevent or inhibit the corrosion of microorganisms, they must undergo anticorrosion treatment to avoid reducing the quality of the skins. The most commonly used antiseptic methods in the tanning industry are salt curing and salt drying.
The papermaking industry uses sodium sulfate, magnesium sulfate, sodium chlorate and other salt chemical products to manufacture pulp, bleached pulp and as fillers.
A variety of salt chemical products are also widely used in match, gunpowder, printing, film and photography industries.
8. Application in national defense and cutting-edge technology
Salt chemical products are also widely used in the electronics industry and national defense industry. In the defense industry, chlorate, perchlorate, potassium nitrate, barium nitrate, strontium nitrate, and chlorine Potassium and other salt chemical products.