t is widely used in the national economy, many industrial sectors need it. The largest use of caustic soda is in the manufacture of chemicals, followed by paper, aluminium, tungsten, rayon, cotton and soap manufacturing. In addition, in the production of dyes, plastics, pharmaceuticals and organic intermediates, the regeneration of old rubber, the production of sodium metal, water electrolysis and inorganic salt production, the preparation of borax, chromium salt, manganese salt, phosphate, etc. , also use large amounts of it.
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