The once roughing operation in Shanggong Gold Mine uses flotation column.However,the ore-dressing performance is not satisfying.To improve ore-dressing efficiency,Shanggong Gold Mine conducted semi-industrial test on Jingrui micro-foam flotation concentrator and compared it with flotation columns.The results show that whatever ore it is,sulfide ore,oxide ore,high lead content ore and blended ores included,Jingrui micro-foam flotation concentrator outperforms flotation column and can enhance the recovery of fine-particle grade gold minerals.The gold grade of  gold concentrates obtained by the Jingrui micro-foam flotation concentrator is 32.32 g/t,42 % higher than that of the concentrates by flotation column,the gold recovery rate increasing from 26.39 % to 51.50 %;Jingrui micro-foam flotation concentrator can replace flotation column in the roughing operation in Shanggong Gold Mine,and can directly yield high-grade gold concentrates.The flotation performance is good.