... , movie producer, tanning, dressing, metallurgy, fiber, rubber industry, also used as detergent, flame retardant, used as food ... reagent, also used in inorganic synthesis and pharmaceutical industry .Forth, Make acidity regulator and chemical raising ... in food, medicine, film, tanning, dressing, metallurgy, fiber, rubber industry, etc, also can use detergent, fire extinguishing agent. Introduction ...