Abstract: Tantalum， niobium and tin are associated with a pegemite type lithium polymetallic ore in Xinjiang， among which tantalum and niobium mainly exist in the form of tantalum and niobite， and tin mainly exist in the form of cassiterite. In order to improve the recovery rate of the associated elements， the principle process flow of coarse grinding， gravity separation preconcentration， high-intensity magnetic separation， and centrifugal separation was determined according to the properties of the ore， and the related condition test were conducted. The suitable particle size for gravity separation was determined as -0.35 mm by heavy liquid analysis. The pre-concentration of tantalum， niobium and tin was realized by screw chute roughing and shaking cleaning under this condition. High intensity magnetic separation of cassiterite and tantalum-niobite from pre-concentrated concentrate was carried out. The suitable working parameters were magnetic field intensity of 800 mT and pulsation frequency of 260 times/min. The non-magnetic products are mainly cassiterite and spodumene. Under the conditions of washing water of 2.0 L/min， ore feeding concentration of 30% and ore feeding amount of 1.0 kg/min， the suitable gravity acceleration of centrifugal separation is determined to be 50G in the centrifugal separating test. According to the technological conditions determined by the condition test， the whole process test of spiral chute roughing， shaking table cleaning， low intensity magnetic separation， high intensity magnetic separation and centrifugal gravity separation was carried out. Finally， tantalum and niobium concentrate with Ta2O5 grade of 13.90%， Nb2O5 grade of 29.14%， Ta2O5 recovery rate of 49.50%， Nb2O5 recovery rate of 58.37% and Sn concentrate with Sn grade of 41.45% and Sn recovery rate of 54.39% were obtained， which effectively realized the comprehensive recovery of associated valuable minerals.

Key words: lithium polymetallic ore, associated metal, preconcentration, magnetic field intensity, pulsating frequency, gravitational acceleration, comprehensive recovery