Application of new compounds in selective extraction of rare earth from aqueous solution containing phosphoric acid and their extraction methods

摘要

The invention relates to the use of extracting at least one rare earth from the aqueous phase containing phosphoric acid as an extractant, and the at least one compound represents an integer equal to 0, 1 or 2 in response to the following general formula () I: n, and R1 and R2 represent h or hydrocarbon group. In the aliphatic group, one of R3 and R4 responds to the following formula (("II"): where R5 and R6 represent a hydrocarbon group,Hydroxy or alkoxy, wherein the other of R3 and R4 responds to any of the following formulas ("II") and ("III"): R5 and R6 represent hydrocarbons,Hydroxy or alkoxy, and R7 and R8 represent h or aliphatic hydrocarbon groups. The invention also relates to a method for recovering at least one rare earth using the compound and a specific compound as the compound.