Hydrochloric Acid Recovery from Rare Earth Chloride Solutions by Vacuum Membrane Distillation (1) Study on the Possibility

摘要

The equilibrium between the gas-liquid phases of the system of HCl-RECl3-H2O was analyzed,and the possibility of hydrochloric acid recovery from rare earth chloride solutions by vacuum membrane distillation （VMD） was experimentally studied in the laboratory scale. The results indicate that increasing initial concentrations of both hydrochloric acid and rare earth increase recovery ratio of hydrochloric acid,and recovery ratio of 80% can be achieved. Concentrated multiple of rare earth shows great influence on recovery ratio,leakage ratio of rare earth is less than 2% generally,and pure acid can be acquired in the permeate side. The two factors,namely flux and leakage ratio,which may determine the future use of VMD were also discussed.