Dissolving out method of high-sulfur bauxite

The invention discloses a dissolving out method of high-sulfur bauxite, which comprises the following steps of: 1, preparing high-sulfur bauxite and circulating mother liquor into ore pulp feed according to a molecular ratio of 1.3-1.5, wherein the concentration of Na2Ok of the circulating mother liquor is 150-260g/L and a causticity ratio is 2.5-4.0; and 2, carrying out Bayer process dissolving out on the ore pulp feed at a temperature of 240-280 DEG C for 30-90min. According to the method, the loss of aluminum oxide can be reduced, the red mud quantity and the water washing quantity are reduced, the lime cost is lowered, the anti-causticization quantity is reduced, and all valuable elements in the red mud are favorably enriched and comprehensively utilized.