Research on Magnetic Separation Process of Fine-grained Lean Magnetite Ore in Anshan Region
The iron grade of iron ore in Xudonggou and Yabaleng mining areas in Anshan region is 29.50%.The main i-ron minerals is magnetite,and the main gangue mineral is quartz.In order to develop and utilize the ore efficiently,based on the ore properties analysis obtained by X-ray fluorescence analysis,chemical composition analysis,iron phase detection and scan-ning electron microscope,the selection conditions of wet coarse medium magnetic preconcentration,stage grinding stage weak magnetic separation,elutriation machine cleaning and extended continuous separation test were carried out.The results showed that:① the iron grade and recovery rate of magnetic pre-selected coarse concentrate in the drum magnetic separator of-2.5 mm high pressure roller grinding products are 40.20%and 89.76%;② After two stages of grinding(the fineness of the first and second stages of grinding is-0.074 mm accounting for 75%and-0.045 mm accounting for 90%,respectively),three sta-ges of low intensity magnetic separation,and one stage of washing machine selection,the iron concentrate with final yield of 35.73%,iron grade of 67.08%,iron recovery of 81.24%was obtained,and iron grade of tailings is only 8.61%.The research results can be used as the basis for development and utilization of the ore.
lean magnetitefine grainspre-concentration for coarse particlesstage grindingstage magnetic separation
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