The solvent extraction of cerium(IV) and fluorine(I) from simulated sulphuric acid leaching of bastnasite by Cyanex 923 was studied. The results showed that Cyanex 923 can extract not only Ce(IV) as Ce(HSO4)2 (SO4) · 2(Cyanex 923) and F(I) as HF · (Cyanex 923) respectively but them together. The extraction mechanism of Ce(IV) together with F(I) can be related to the formation of Ce(HF)(HSO4)2 (SO4) · 2(Cyanex 923). It was also showed that boric acid in the leaching liquor which was added to chelate F(I) wasn't extracted alone by Cyanex 923 and didn't influence the Cerium(IV) extraction. Boric acid can enhance the extraction of HF and came into organic phase in form of (HF)(H3BO3) · (Cyanex 923). Hydrofluoric acid was extracted from the bastnasite leaching mainly together with Ce(IV). The results also showed that temperature didn't affect the extraction process. IR spectra of purified Cyanex 923 saturated with Ce(IV), HF and H3BO3 were discussed.
No takes yet. Share an insight, caveat, or question.
Liao et al. (2001) studied this question.