Magnetic Separation Test and Process Mineralogy Study of Aegirine-type Niobium-bearing Ore in Bayan Obo
In order to fully develop and utilize the niobium ore resources in Bayan Obo,the process of intermediate inten-sity magnetic separation-intermediate high intensity magnetic separation-high intensity magnetic separation was used to study the quality magnetic separation and process mineralogy of aegirine-type niobium-containing minerals.The differences of process mineral characteristics such as mineral composition,dissociation degree,intergrowth and occurrence state of different magnetic separation products were explored,and the trend of niobium minerals in the magnetic separation process was revealed.The re-sults show that under the condition of 238.85 kA/m magnetic field strength,the iron removal rate of intermediate intensity magnetic separation process reaches 62.57%,which can reduce the adverse effect of magnetic/hematite on the subsequent nio-bium flotation.Under the condition of 0.5 T magnetic induction intensity,the calcium-containing barium gangue minerals such as fluorite,apatite,calcite and barite in the intermediate high intensity magnetic separation concentrate are greatly reduced,which simplifies the mineral composition of niobium-containing ore and facilitates the further separation and enrichment of nio-bium minerals.Under the condition of 1.4 T magnetic induction intensity,the niobium grade of the high intensity magnetic sep-aration concentrate is increased from 0.17%of the raw ore to 0.219%.The main niobium-bearing mineral in the high intensity magnetic separation tailings is pyrochlore,and the niobium mineral composition is simple.The research results can provide the-oretical guidance for improving the magnetic separation process of niobium minerals and improving the subsequent flotation effect of niobium minerals.
Bayan Obo oreniobium-containing mineralsquality separationprocess mineralogy analysis
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