High Leaching Efficiency of Rare Earth Elements (Ce, Pr, Nd, La) from Alkaline Decomposition Products in [Hbet][Tf2N]-H2O

The leaching rates of rare earth elements (Ce, Pr, Nd, La) from alkaline decomposition products in [Hbet][Tf2N]-H2O were 92.96%, 91.20%, 100%, and 100%, respectively. The fluorine elements not removed during alkaline decomposition were present in the leaching residue in the form of 'fluocarbonate', and hardly entered the leachate.