Experimental Study on Comprehensive Recovery of a Certain Lithium-Tantalum-Niobium Ore in Xinjiang AITranslate

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Chinese Library Classification Number:TD955[矿业工程—选矿]

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A experimental study on comprehensive recovery of spodumene and associated tantalite-columbite from a granitic pegmatite-type spodumene ore from Xinjiang with a Li₂O grade of 1.66%,Ta₂O₅ grade of 0.0137%,and Nb₂O₅ grade of 0.0148%was carried out.A stepwise recovery process combining gravity separation,flotation,and magnetic-gravity separation was adopted.Coarse-grained spodumene was first re-covered by dense medium separation.Rougher flotation conditions for the gravity separation product were then optimized,and closed-circuit tests of dense medium separation and flotation with one roughing,two scavengings and three cleanings were conducted.Finally,associated tantalum and niobium were recovered from lithium concentrate using a combined process of high-intensity magnetic separation and shaking table gravity separation.The results show that under the dense medium separation conditions with the raw ore crushed to-6 mm and a dense medium suspension density of 2.45 g/cm³,and the rougher flotation condi-tions including a pulp density of 30%,a grinding fineness of 76.30%passing-0.074 mm,and reagent dosages of 500 g CaCl2,2000 g SG,1200 g NaOH,800 g Na₂CO₃,and 1200 g ZGP-series collec-tors(800 g ZGP-1+400 g ZGP-3),a lithium concentrate with Li₂O grade of 5.79%and recovery of 30.73%is obtained via the gravity-flotation closed-circuit process.The recoveries of associated Nb₂O₅ and Ta₂O₅ in the lithium concentrate reach 92.03%and 94.07%,respectively.Subsequently,the mixed lithium concentrate from the gravity-flotation process was treated by 20 kOe high-intensity magnetic separation combined with two-stage shaking table gravity separation,producing a tantalum-niobium concentrate with Nb₂O₅ grade of 14.75%(recovery 77.31%)and Ta₂O₅ grade of 16.03%(recovery 80.94%).The pro-posed process realizes the comprehensive recovery of lithium,tantalum and niobium resources.