Recovery Tests of Niobium and Barite from a Polymetallic Ore Containing Iron and Niobium in Uganda
The original ore of a certain niobium polymetallic mine in Uganda is severely weathered,with complex ore properties,and is considered an extremely difficult polymetallic ore to be selected.The ore has a total iron(TFe)grade of 39.78％,a rare earth oxides(REO)grade of 1.79％,a niobium pentoxide(Nb2O5)grade of 0.62％,and a barium oxide(BaO)grade of 7.68％;The main gangue minerals are quartz,feldspar and kaolinite.In order to efficiently recover and utilize the associated niobium and barite in the ore resources,a mineral processing experiment was conducted using the on-site mag-netic separation iron tailings as the subject.The process involved a combined gravity-magnetic pre-concentration and reverse flotation separation to separate niobium and barite.The experimental results indicated that by processing the on-site magnetic separation iron tailings with one table gravity concentration,one low intensity magnetic separation,and a closed circuit flotation process consisting of one roughing,four cleaninging,one cleaning-scavenging and two cleaning stages,it is possible to obtain a niobium concentrate with a grade of 7.33％Nb2O5 and a recovery rate of 41.94％,as well as a barite concentrate with a grade of 94.23％BaSO4 and a recovery rate of 50.98％.The findings can serve as a basis for the on-site modification of the recovery process for the associated niobium and barite.
niobium orejoint pre-enrichment with gravity and magnetic separationreverse flotation
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