Application of Industrial Salt

Industrial salt refers to raw salt, lake salt, well salt and sea salt, is white, off-white, or colorless crystalline powder, widely used in industry, common uses are described as follows:

1. Application in chemical industry

Industrial salt is the mother of the chemical industry. Chemical industry is the basic industry of national economy. Three acids (sulfuric acid, hydrochloric acid, nitric acid), two alkali (soda ash, caustic soda) is the basic chemical industry, and among which hydrochloric acid, soda ash, caustic soda is the main raw material production of salt, each production of 1 ton of soda ash or caustic soda to consume 1.2 to 1.4 tons of raw salt, the world for the production of sodium alkali, chlorine and chlorine derivatives of more than 80 kinds of basic chemical products used in the salt, It accounts for more than 60% of the world's total salt consumption, and in industrialized countries, chemical salt generally accounts for more than 90% of the total salt consumption. Therefore, it can be said that the comprehensive development of the national economy depends on the developed chemical industry, and the developed chemical industry depends on the developed salt industry.

2. the application in the dye industry

Raw materials commonly used in the dye industry such as caustic soda, soda ash and chlorine are directly produced from salt as raw materials, hydrochloric acid, sodium sulfide, insurance powder, etc., are chemical products made from salt by deep processing; In addition, it directly consumes a lot of salt. Therefore, in addition to the chlor-alkali industry, the dye industry is one of the industries that is very closely related to the salt industry. And almost every step in the dye production process consumes a certain amount of salt.

3. Application in metallurgical industry

Industrial salts are used in the metallurgical industry as chlorination roasting agents and quenching agents, and also as desulfurizers and clarifying agents for the treatment of metal ores. Steel products and steel rolled products immersed in salt solution can harden their surface and remove the oxide film. Salt chemical products are used in the pickling of strip steel and stainless steel, aluminum smelting, electrolysis of sodium metal and other cobaking agents, and refractory materials in smelting are salt chemical products.

4. Application in building materials industry.

Soda ash made from salt is the main raw material for glass production. In addition, in order to eliminate the bubbles in the glass liquid when melting glass, a certain amount of clarifying agent must be added, and salt is also commonly used in the clarifying agent. General coarse pottery, ceramic tiles and jars need to use salt as a glaze. In order to improve the performance of Tang porcelain glaze, it is necessary to add some enamels before enameling, and salt is a kind of enameling, which is used for the surface glaze to increase the strength of powder damage and improve the ability to resist nicks and wear after making enamel. In addition, the waste residue of salt production (salt gypsum), as well as the calcium and magnesium mud produced in brine purification (salt mud), can be used as building wall panels, wall materials or fillers, and can also be used as cement fillers.

5.the application of machinery industry

In casting, salt can be used as an excellent adhesive for sand in non-ferrous metal and alloy casting. At high temperatures, salt makes the core of the casting soft, thereby preventing the production of hot cracks in the casting. Compared with organic adhesives, salt also produces the least harmful gases at high temperatures.

In the heat treatment of steel mechanical parts or tools, the most commonly used heating equipment is the salt bath furnace. Compared with box-type furnace heating, salt bath furnace has many advantages such as easy temperature control, uniform heating, fast heating speed, local heating, long and thin workpiece is not easy to bend, and oxidation and decarbonization can be avoided. At the same time, it is used as a common catalyst in the process of carburizing chemical heat treatment, and the ideal effect can be obtained by quenching with brine in the process of heat treatment. Salt is required for strong pickling of ferrous metals and copper and copper alloys before electroplating.

6. Application in the petroleum industry.

In order to protect the integrity of the rock salt formation core during the drilling of oil well, salt should be added to the mud as stabilizer, and barium sulfate should be used as a salt chemical product to make the drilling mud heavy and adjust. When petroleum is refined, salt is used as dehydrating agent to remove water mist in gasoline. In the refining process, salt is used as a filter to remove impurities. There are also many salt chemical products widely used in the petroleum industry.

7. Application in light industry.

In soap making, salt is often added to maintain a suitable viscosity of the solution. Due to the action of sodium ions in salt, the viscosity of saponification solution can be reduced, so that the saponification reaction can proceed normally. In order to achieve sufficient concentration of fatty acid sodium in the solution, it is also necessary to add solid salt or concentrated brine, salt out, and extract glycerol. In soap and synthetic detergent, salt chemical product sodium silicate is also used as a filler, which can increase the alkalinity, hardness and strength of soap.

Leather industry needs a large number of leather, raw materials in the storage and transportation process, in order to prevent or inhibit the erosion of microorganisms, must be anti-corrosion treatment, so as not to reduce the quality of the skin. The most commonly used preservative methods in the tanning industry are salt curing and salt drying. During the tanning process, the bare skin must be soaked in an acid soaking solution, and salt is also essential. Raw skin hair removal in leather, leather shoes to use sodium sulfide, sodium hydrogen sulfide, sodium thiosulfate and other salt chemical products.

The paper industry manufactures pulp, bleached pulp and used as fillers, etc., using sodium sulfate, magnesium hydrophobics, sodium chlorate and other salt chemical products. Matches, gunpowder, printing, film and photography industries also widely use a variety of salt chemical products.