Abstract:Maoniuping rare earth mine is the second largest light rare earth mine in Sichuan province, China. The ore is mainly bastnaesite type rare earth and associated with barite and fluorite. In order to improve the recovery rate of fine-grained rare earth, the mixed flotation process was used to replace the original flotation process and develop a new collector CXS-211, the adaptability of the new reagent to ore properties is improved through optimization test. The closed-circuit test results show that the mixed flotation concentrate can be obtained with the recovery rate of REO more than 92% and fluorite more than 88% by using the new agent.