Abstract: To address the challenges of severe slime interference and inefficient recovery of fine-grained cassiterite from a highslime,finegrained tin ore in a concentrator,this study employed a centrifugal concentrator to pre-concentrate the fine cassit erite,effectively removing slime gangue and mitigating its adverse effects on subsequent flotation.The centrifugal concentrate was processed using a novel combined collector HC-51,primarily composed of dihydroxamic acid,through a flotation circuit consisting of one roughing,three cleaning,and three scavenging.A tin concentrate with a grade of 16.40% and a recovery of 75.73% was ultimately obtained,effectively resolving the processing difficulties associated with highslime,lowgrade fine tin slime products.This approach not only yields a relatively highgrade concentrate but also significantly reduces the slurry volume entering the flotation stage and substantially lowers flotation reagent costs,demonstrating distinct technical and economic advan tages.This study provides a feasible technical pathway for the efficient recovery of highslime,finegrained cassiterite and holds significant practical value and application prospects for the secondary utilization of lowgrade tin resources.

Key words: finegrained tin,centrifugal separation,preconcentration,dihydroxamic acid,efficient recovery