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Abstract:A kind of cryptocrystalline oolitic hematite was dealt with by magnetization roasting - stage grinding - magnetic separation technology. The obtained crude iron concentrate grade was TFe57.73%, phosphorus content 0.70%, total iron recovery rate of 90.41%.Deep grinding of the artificial magnetite was carried out for better results. The degree of disintegration of the coarse concentrate was determined to be 79.6% under the grinding fineness below 0.022mm, and the degree of monomer dissociation was 84.63%. A selective flocculation - magnetic seed method was used to optimize the iron extraction process for fine grinding of coarse concentrate. Iron ore concentrate with a total iron grade of 60.87%, a phosphorus grade of 0.41%, and the total iron recovery was increased by 9.55%. It indicatesSon theSmechanismSanalysisSthat the magnetism of the artificial magnetite is obviously weaker than that of the natural magnetite,as grain size decreases, the magnetic difference between the two increases further. The specific magnetic susceptibility of the natural magnetic species used as magneticSseeds was 2.4 times of an artificial magnetite at a magnetic field strength of 70 kA/m. The test of the particle size before and after flocculation found that there are both large increase in weighted average grain size of the finely ground coarse concentrate or artificial magnetite, but the increasement of the grain size of the flocculation quartz is very small, Therefore, it was inferred that CMS has no flocculation effect on quartz. It was proved that CMS produced selective adsorption on the surface of artificial magnetite particles by FTIR analysis.
文章编号： 中图分类号：TD925.7 文献标志码：