Abstract:A alumina plant uses high-sulfur bauxite to produce alumina, which brings great influence to production: iron content of alumina product increases, equipment corrosion increases, and settlement effect becomes worse. To address these issues, research and industrial tests were carried out. The principle of chemical oxidation desulfurization reaction and oxidation effect with sodium nitrate in high temperature dissolution process of alumina production were clarified. When sulfur content of high-sulfur bauxite is about 0.3%, adding a small amount of sodium nitrate can maintain iron content in alumina products within the range of first-grade products for a long time. This technology is simple, effective and economical, and can be widely used in industrial production.