Fluorite concentrate is the main raw material for the production of fluoride salt. The content of SiO2 in fluorite concentrate is one of the main quality indicators. If the SiO2 content is too high, it will increase the impurity content in the fluoride salt product, and at the same time, the mother liquor of the circulation system can not be recycled and discharged. Not only can the sodium fluoride in the mother liquor be reused, but it also causes environmental pollution. The key to reducing silicon in fluorite concentrate is grinding. The fluorite and quartz monomer must be dissociated by grinding to separate the fluorite from the quartz by flotation. When the particle size is too coarse, there are fluorite and quartz in the grinding product. The continuous body, the coarse concentrate contains high silicon. When it is too fine, the recovery rate of concentrate is often low due to fluorite pulverization and flotation. It must be ground until the fluorite and quartz are separated from each other, and the fluorite is not crushed. It should be sorted by stage grinding process.
Chen Hong et al. In the flotation test of a refractory fluorite ore with high silicon content and fine grain size, the ore composition is: fluorite 40%, quartz 43.8%, kaolin (mud) 1.2%, chalcedony 3.0 %, sericite 0.6% and a small amount of metallic minerals, fluorite and quartz very close relationship, fluorite containing dissociation cracks in the quartz particle size 0.02mm, in addition to the large particles is fluorite reticular structure interspersed quartz vein, to To obtain qualified fluorite concentrate, sufficient monomer dissociation must be achieved. The results of stage grinding and stage selection show that the fluorite concentrate grade and recovery rate increase with the increase of regrind fineness. . Only the fluorite monomer dissociation can separate the fluorite from SiO2, and the grinding fineness is not enough. It will inevitably cause some cryptocrystalline quartz to exist between some fluorite particles, which will affect the final fluorite quality and improve the regrind. Fineness is the key to solving the quality of fluorite concentrate.
A fluorite ore has a CaF of 254.08%, a SiO2 of 26.29%, and a CaCO of 35.6%. Its ore is muddy, fluorite and SiO 2 are closely symbiotic, and the size of the inlay is extremely uneven. By adopting a stage grinding process of rough grinding and coarse concentrate re-grinding, selecting acidic water glass and Hll01 effective inhibitor, the purpose of reducing the fluorite concentrate is reduced, and the fluorite concentrate meets the requirements of the first grade. .
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