Abstract:Single flotation process is adopted in Weishan rare earth mine production. When the feed rate of the newly proved No.12 vein ore is more than 30%, the concentrate grade and metal recovery rate of beneficiation production are reduced from 45% and 85% to 30% and 55%, which seriously affects the economic benefits of the enterprise. In order to find out the reason, the whole process was investigated, and the rock ore identification was carried out for the tailings of secondary cleaning in the flotation process. By means of electron probe microanalysis and energy spectrum analysis,it is found that the rare earth mineral in No.12 ore vein is mainly carbocernaite, The second is Bastnasite and Parisite. The combined process of flotation and high intensity magnetic separation was used to make rare earth minerals step by step. The problem that middling worsened the beneficiation index of No.12 vein ore by single flotation was solved. The concentrate with grade of 40.18% and middling with grade of 16.59% were obtained. Due to the high content of Sr and Ba in middlings, good economic benefits can be obtained by comprehensive recovery of rare earth, strontium oxide and barium oxide by chemical beneficiation and metallurgy process.