Experimental study on cleaning of tantalum-niobium rough concentrate in Africa

Experimental study on cleaning of tantalum-niobium rough concentrate in Africa was carried out.Contrast tests for separation of niobite and ilmenite by different type magnetic separation equipments were conducted,separation effect is the best by CRIMM electro-magnetic high gradient magnetic separator,electrostatic separation was adopted to reclaim ilmenite from magnetic separation tailings.The united flowsheet of magnetic- electrostatic separation was used and the comprehensive reclaim of each valuable metal in the rough concentrate has been accomplished effectively,Finally,a tantalum-niobium concentrate with a Ta₂O₅ 、Nb₂O₅ grade and recovery of 5.13%、56.09% and 86.25%、88.86%,was obtained,a nilmenite concentrate with a TiO₂ grade and recovery of 46.65% and 88.68%,respectively was obtained,tin concentrate (Sn grade=57.71%,recovery rate=70.41%) was obtained.