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White or yellow crystalline powder or small crystals, with a strong S02 odor, specific gravity 1.4, soluble in water, aqueous solution is acidic, and strong acid contact will release SO2 and generate the corresponding salts, long-term in the air, then oxidized into Na2S206, so the product can not be stored for a long time. Above 1500C, that is, the decomposition of S02.
Use: 1. Sodium bisulfite is used for bleaching of cotton fabrics and organic matter; printing and dyeing industry is used as deoxidizer and bleaching agent for boiling of various cotton fabrics, which can prevent cotton fiber localization and affect fiber strength, and improve the whiteness of boiling materials; 2. Used as a reducing agent in dyes, papermaking, leather making, chemical synthesis and other industries to prevent the oxidation of semi-finished products during the reaction; 3, the pharmaceutical industry sodium bisulfite for the production of metamizole and aminopyrine intermediates; 4. The edible grade product sodium bisulfite is used as bleaching agent, preservative and antioxidant; The water treatment industry is used for the treatment of chromium-containing wastewater and as an electroplating additive.
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