Study On Mineralogy And Flotation Technique Of Super Pure Pyrite Concentrate

With the fast progress of science and technology of modern mineral engineering, the super pure pyrite concentrate with the grades of more than 50% S and 45% Fe, is widely applied in steel industry, wearing materials and tools. In this paper, based on mineralogy, the flotation technology and reagent system for producing super pure pyrite concentrate by using the pyrite concentrate with the grade of about 45% S and the tailing of molybdenite processing from Zhong Plant in Jinduicheng Molybdenum industry Ltd., Co., were investigatedXRD and SEM analysis showed that the main minerals in pyrite concentrate from Zhong Plant were pyrite, while the contents of chalcopyrite, molybdenite, sphalerite and galena were little. The size analysis showed that the grades of sulfur and iron in +325 mesh of the pyrite concentrate were higher, but didn't reach up to the requirements of super pure pyrite concentrate. The grades of sulfur and iron in —325 mesh were lower. Mineralogy indicated that the intergrowth pyrites in every sieve internals were little, but the intergrowth relationship is complicated. The purity of super pure pyrite concentrate should be more than 94%, so the existence of intergrowth minerals with pyrite could affect the production of super pure pyrite concentrate.Based on the above investigation, through optimizing the flotation technology and reagent system, the batch laboratory tests showed that when the content of —325 mesh accounted for 95% after re-grinding the pyrite concentrate from Zhong Plant, the super pure pyrite concentrate with the grades of 50.11% S and 45.40% Fe could be obtained by the flotation flowsheet with one roughing stage, three cleaning stages and middlings backing out in turn. Based on the results from the batch laboratory tests, the continuous pilot flotation test was carried out, which included one roughing stage and four cleaningstages. The pilot test obtained the super pure pyrite concentrate with the grades of 52.25% S and 45.05% Fe and the recovery of 87.16% S, and eligible other index. The results of pilot test were consistent to that batch laboratory test. They both indicated that the super pure pyrite concentrate desired can be produced by using the pyrite concentrate from Zhong PlanIn the paper, it was also studied that the tailing of Mo processing from Zhong Plant was directly used to producing super pure pyrite concentrate. The study included mineralogy, flotation flowsheet and reagent system. The obtained results showed that through re-grinding and re-concentrating the rougher concentrate, the tailing of Mo processing could be used to produce super pure pyrite concentrate, but the yield was lower.The achievement of production of super pure pyrite concentrate has an important significance for further handling the pyrite concentrate of Jinduicheng Molybdenum industry Ltd., Co., so improving the benefit of corporation, and market competing ability of product.