Abstract: Aiming at the problems of tailings expansion,difficult consumption and waste of resources in a lepidolite concentrator,the tailings of the plant were taken as the research object,and the comprehen⁃ sive recycling technology was studied on the basis of property analysis.The results show that the grade of Li2O in the tailings is 0.33%,in which mica is the main carrier mineral of lithium ,and the distribution rate is 94.82%.By systematically studying the effects of magnetic separation parameters ,collector combination and inhibitor combination on the recovery of fine-grained lepidolite ,the optimal operating conditions were determined.The magnetic separation pre-concentration of tailings slurry was carried out by using the bristle medium and 1.5 T magnetic induction intensity,and the magnetic concentrate with Li2O grade of 0.68%and recovery rate of 78.11%was obtained,and the whiteness of tailings reached 56.2.In the flotation of magnet⁃ ic separation concentrate,the combined collector of cocoylamine and sodium oleate（dosage ratio 1 ∶2,total dosage 500 g/t）was selected,and the combined inhibitor system of sodium hexametaphosphate and baking gum (dosage ratio 1 ∶2,total dosage 400 g/t)was used.Through the closed-circuit flotation process of one roughing,two cleaning and one scavenging,the lepidolite concentrate with Li2O grade of 1.62%and recov⁃ ery rate of 79.56%was finally obtained,and the feldspar powder with whiteness of 56.2%was obtained. The process effectively realizes the efficient recovery of lithium resources in lithium tailings ,and provides a reliable technical basis for the resource utilization of tailings.

Key words: lithium tailings, magnetic separation, flotation, comprehensive recovery