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A novel ionic liquid type saponification processing based on quaternary phosphonium type bifunctional IL was developed for yttrium separation from ion-adsorbed rare earth deposit.The extractabilities of([trihexyl(tetradecyl)phosphonium][sec-octylphenoxy acetate]([P_(6,6,6,14)][SOPAA]) were pronouncedly higher than those of sec-octylphenoxy acetic acid(HSOPAA),a mixture of HSOPAA and[P_(6,6,6,14)]Cl for rare earth elements(REEs).The ion association extraction mechanism contributed to avoiding the numerous saponification procedures using alkali and resulting in saponification wastewater.After 13 stages of extraction and 6 stages of scrubbing sections,the Y(Ⅲ) was successfully separated from industrial heavy RREs feed,the purity of Y(Ⅲ) in raffinate was approximately to be 98.9%.Stripping by distilled water was effectively achieved for REEs,which contributed to the decreased consumption of acid to a considerable extent.
A novel ionic liquid type saponification processing based on quaternary phosphonium type bifunctional IL was developed for yttrium separation from ion-adsorbed rare earth deposit. The extractabilities of ([trihexyl (tetradecyl) phosphonium] [sec- octylphenoxyacetate] ([P_ (6, 6,6,14)] [SOPAA]) were pronouncedly higher than those of sec-octylphenoxy acetic acid (HSOPAA), a mixture of HSOPAA and [P 6,6,14] Cl for rare earth elements The Ion association extraction mechanism contributed to the numerous saponification procedures using alkali and resulting in saponification wastewater. After 13 stages of extraction and 6 stages of scrubbing sections, the Y (III) was successfully separated from industrial heavy RREs feed, the purity of Y (Ⅲ) in raffinate was approximately to be 98.9% .Stripping by distilled water was effectively achieved for REEs, which contributed to the decreased consumption of acid to a tolerable extent.