Abstract:The improvement and utilization of high iron and high sulfur bauxite is of great significance for ensuring the safety of strategic mineral resources in China''s aluminum industry. A potential pH diagram of Fe-S-H2O system was plotted for a high iron and high sulfur diaspore bauxite with mass fraction of 13.66% iron and 16.24% sulfur, mainly consisting of pyrite. The results show that synchronous leaching of iron and sulfur can be achieved when the pH value of the system is less than the critical pH value of Fe3+ hydrolysis. Under the conditions of a liquid-solid ratio of 4 mL/g, leaching temperature of 170 ℃, oxygen partial pressure of 0.20 MPa, and insulation time of two hours, the leaching rate of iron and sulfur is 94.08% and 98.34%, respectively, and the iron and sulfur mass fration in the leaching residue is 1.23% and 0.41%, respectively. The XRD results show that the main phase of the leaching residue is diaspore, achieving the improvement of high iron and high sulfur bauxite. The main solute of the leaching solution is iron sulfate, which has the potential for further resource utilization of iron and sulfur.