Abstract:Desulfurization experiments on the high-sulfur bauxite ore from a certain mining area were carried out with different roasting methods, and a static roasting test method which can simulate the fluidized roasting desulfurization process was proposed. The appropriate technological conditions of desulfurization by roasting were ascertained after systematic roasting desulfurization tests，and the effect of roasting process on the Bayer digestion performance of the concentrate was investigated. The ST in the desulfurized concentrate was about 0.50%, and the S2-was not higher than 0.10%, under conditions that the weight percent of the ground bauxite particles passing through 250μm was not lower than 90.84%, the roasting temperature was 580℃～600℃, and the roasting time was 2 minutes. The alumina digestion rate of the roasted concentrate was over 89%, the A/S of the red mud was 1.31～1.34, and the N/S of the red mud was 0.15～0.16, under conditions that the lime addition was 10%, the digestion temperature was 265℃, the αk of the digestion liquor was 1.35～1.39, and the enduring time was 50 minutes. The digestion performance of the roasted concentrate had been changed little under the same laboratory digestion conditions when compared to the raw high-sulfur bauxite.