Comprehensive Utilization of Sulfur Separation Tailings of High Sulfur Rare Metal Complex Ore in Coal Measure

This is an essay in the field of metallurgical engineering. Comprehensive utilization of sulfur separation tailings from a coal measure high sulfur rare metal complex ore in Chongqing area was studied, which provided a feasible basis for the recovery of valuable elements such as aluminum, silicon, rare earth and niobium. The experimental results show that the optimum leaching conditions are as follows: sulfuric acid concentration 70%, leaching time 3 h, leaching liquid to solid ratio 3, leaching temperature ≥135 ℃. Under these conditions, the Al₂O₃ leaching rate can reach 87.25%. Acid leaching solution can be used to prepare aluminum sulfate as a water treatment agent. SiO₂ can be obtained from acid leaching residue after enrichment of valuable elements such as silicon, rare earth and niobium by NaOH leaching. The content of more than 85 g/L alkali leaching solution, used for the preparation of sodium silicate products; After enrichment of rare earth and niobium elements, the content of TREO and Nb in alkali leaching residue is 1820 g/t and 274 g/t, which can be used as raw materials for the recovery of rare earth and niobium elements.