Abstract:The experimental research on the recovery of pyrite ore in the ultrafine particles is mainly through acid activation and optimization of process conditions. The tailings overflow sample of sulfur selection operation was tested and studied by conventional flotation method. Under the raw material condition of -600 mesh and sulfur grade of 30.11%, grade of 50.77% and a recovery rate of 71.93% of high-grade sulfur concentrate were obtained. The iron content from the slag produced by this grade sulfur concentrate is over 63%, and the slag can be used as raw material of steel production.