Abstract: Contents of sulphur and Al₂O₃ in a high sulphur bauxite in Guizhou are 5.45% and 57.34% respectively,the disseminated grain size is fine and the main useful mineral is diaspore.In order to provide qualified bauxite concentrate for alumina production,desulfurization experiment was carried out by flotation desulphurization technology.The results show that raw ore grinding to -0.075 mm 85%,with SNS as inhibitor,copper sulfate as activator and butyl xanthate as collector,in the condition of pulp pH=8.5,a good index of  bauxite concentrate with sulfur content of 0.32%,desulfurization rate of  94.89% was ontained via one roughing-three cleaning-two scavenging flotation desulphurization closed cycle process,which could meet the demands of alumina production by Bayer process for the content of sulfur in raw materials and the tailings could also be used as the raw material for the production of sulphuric acid,so the comprehensive benefits were better.

Key words: High sulfur bauxite, Desulfurization by flotation, Desulfurization degree