Abstract: Three strains of Thiobacillus ferrooxidans which are obtained from the high sulfur coal mine are used to the bacterial oxidation leaching and desulfurization research on a high sulfur bauxite from Chongqing.Under the suitable conditions, the desulfurization degree are in excess of 74%, the desulfurization degree of SX-1^# bacteria reaches to 83.57%, the content of sulfur of bauxite decreases from 3.83% before bacterial oxidation leaching to 0.69%, and reach to the demand of the content of sulfur of bauxite by bayer process producing alumina.The experimental results show that the biological oxidation technology of pyrite is useful for removing the sulfur from the bauxite.

Key words: Bauxite, Pyrite, Thiobacillus ferrooxidans, Bacterial oxidantion