Abstract:Applying distillation slag of molten salt slag of rare earth electrolysis treated by mineral phase reconstruction and vacuum distillation as raw material, rare earth was extracted by hydrochloric acid leaching. Effects of acidic leaching time, acidic leaching temperature, concentration of hydrochloric acid, and L/S on leaching rate of rare earth and iron were studied. The results show that leaching rate of rare earth and iron is 99.88% and 44.43% respectively under the optimum conditions including acidic leaching temperature of 50 ℃, concentration of hydrochloric acid of 4 mol/L, acidic leaching time of 1 h, and L/S=4. The purpose of selective dissolution of rare earth is achieved.