Magnetic separation of titanium-containing minerals
The studies have been carried out on the Afrikanda (the Murmansk region) titanium-containing minerals segregation by magnetic separation. The technological scheme of ore preparation and further enrichment is developed taking into account the dissemination and disclosure of a specific mineral for obtaining both titanium-magnetite and perovskite concentrate. Mineralogical characteristics of the crushed ore of the deposit have shown a high degree of titanium-magnetite disclosure. The first stage of magnetic separation of crushed ore is an effective method for isolating titanium-magnetite. The magnetic separation of crushed ore excludes the re-grinding of titanium-magnetite, since fine-grained perovskite perforation provides for finer further grinding, and also reduces the amount of ore mass entering the grinding process in the perovskite release cycle. The nonmagnetic fraction is represented by olivine, perovskite and also slightly calcite. The analysis of the change in the granulometric composition of the ore as a function of the grinding time has been performed. At various fineness of grinding by magnetic separation, conditioned titanium-magnetite concentrates have been obtained. The yield of the concentrate from the ore is 10.9-10.5 %, with Feобщ content equal to 60.6-62.0 %. Perovskite has a weakly expressed magnetic susceptibility with respect to titanium-magnetite. Studies have been carried out on the preparation of perovskite concentrate by magnetic separation. The influence of the degree of grinding of the separation feed, desliming and preliminary classification on the separation of perovskite by magnetic separation has been shown. Perovskite concentrates with the content of 44-46 % TiO2 have been obtained. The indexes of enrichment of titanium-magnetite-perovskite ore by magnetic separation have been presented to obtain titanium-magnetite and perovskite concentrate. An important role in obtaining quality concentrates is associated with the preliminary preparation of ore - grinding, desliming and classifying.