Abstract:  Yunnan is rich in phosphate resources, mainly dominated by medium-low grade carbonatephosphate rock , for which experiments have proved that flotation is the most suitable separation methodThis paper focuses on a medium-grade carbonate phosphate rock ore from a certain phosphate mine inYunnan, with a P,O, grade of 25.15% and a MgO grade of 6.10%. A single reverse flotation processconsisting of one roughing and one scavenging stage was adopted , using a full sulfate中oer and phosphate mineral inhibitor, with the optimal grinding fineness of -0.074 mu at o..v7, +wfatty acid soap as a collector, the carbonate ( Mg0) impurity is removed, and the useful phosphate min.erals are concentrated. The concentrate indexes of phosphorus concentrate P,0,>33. 0% , MgO<1. 2%and recovery rate greater than 90.0%6 can be obtained through single reverse flotation closed circuitprocess under normal temperature test conditions, which provides a strong basis for the comprehensive u-ilization of this mine.