Before there was no industrial production method, people collected soda from natural soda lakes or made soda from alkaline plant ash for detergent, glass, soap, leather manufacturing, etc. With the development of industry, the original soda extraction method can no longer meet the demand for alkali, and large-scale industrial soda making process came into being. At present, the production process of soda ash is mainly divided into synthetic soda ash process and natural soda process. The synthetic soda ash process accounts for about two-thirds of the world's soda ash production capacity, and the natural soda ash process accounts for about one-third.
Soda ash can be divided into lightsoda and heavysodaash according to density. Used in household washing, chemical solvents and food processing industries; The density of heavy alkali is 1000-1200kg/, which is white fine particles and is mostly used in the production of flat glass. Compared with light alkali, heavy alkali has the characteristics of firmness, large particles, high density, low hygroscopicity, not easy to agglomerate, not easy to fly away, and good fluidity. In addition, there are ultra light soda ash and ultra heavy soda ash, with densities of about 370kg/ and 1550-2553kg/ respectively.
According to different uses, soda ash can be divided into industrial soda ash and edible soda ash. Industrial soda shall comply with the national standard gb/t210-2004 industrial sodium carbonate and its test methods (hereinafter referred to as the national standard) issued by the people's Republic of China, including gb/t210.1-2004 industrial sodium carbonate and its test methods No. 1 industrial sodium carbonate part and gb/t210.2-2004 industrial sodium carbonate and its test methods Part 2 industrial sodium carbonate test methods. Edible soda ash shall comply with the standard of gb1886-1992 food additives - sodium carbonate. On the basis of reaching the low salt standard of industrial soda ash, the content limits of arsenic and heavy metals are added.
According to different chloride contents, soda ash can be divided into ordinary alkali, low salinity, ultra-low salinity and ultra-low salinity. According to the national standard, the mass fraction of common alkali sodium chloride is ≤ 1.20%; Mass fraction of low salinity sodium chloride ≤ 0.90%; Mass fraction of ultra-low salinity sodium chloride ≤ 0.70%; Ultra low salinity sodium chloride mass fraction ≤ 0.30%.
In addition, the potassium hydroxide manufacturer will tell you about the main uses of soda ash:
(1) In the field of building materials, as one of the main raw materials of flat glass, soda ash provides sodium ions for reaction and is also the main component of clarifier;
(2) In the field of chemical production, soda ash is widely used to manufacture sodium silicate (commonly known as bubble soda, sodium silicate), sodium bicarbonate (commonly known as baking soda), sodium fluoride, dichromate and other products;
(3) In the field of printing and dyeing metallurgy, soda ash is used as a water softener in the textile production process, or as an auxiliary solvent for smelting, a flotation agent for beneficiation and a desulfurizer for steelmaking;
(4) In the field of food processing, as a pasta additive, soda ash acts as a neutralizer, bulking agent, buffer and dough improver to increase the taste and flexibility of pasta. It can also be used as a main auxiliary additive in the production of monosodium glutamate and soy sauce.
In addition, soda ash is also widely used in environmental desulfurization, pharmaceutical products, tanning, papermaking, etc. high end soda ash can also be used in the manufacture of kinescope glass shell and optical glass.
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