... Fe2O3%Index99.0Min0.03Max0.5Max0.005Max Usage:The manufacture of chemicals, paper, aluminum smelting, refining tungsten, artificial ... silk, rayon and soap manufacturing, production of dyes, plastics, pharmaceutical and organic intermediates, the old ... water electrolysis as well as the inorganic salt production, Preparation of borax, chromium salts, manganese salts, phosphate, etc. ...