Lu Lizhu, Zhang Dali, Ke Jiajun, et al. SEPARATION OF CADMIUM AND ZINC WITH MIXTURE OF DI-(2-ETHYLHEXYL)-DITHIOPHOSPHORIC ACID AND TRIOCTYLAMINE[J]. CIESC Journal, 1998, (5).
Lu Lizhu, Zhang Dali, Ke Jiajun, et al. SEPARATION OF CADMIUM AND ZINC WITH MIXTURE OF DI-(2-ETHYLHEXYL)-DITHIOPHOSPHORIC ACID AND TRIOCTYLAMINE[J]. CIESC Journal, 1998, (5).DOI:
The extraction and stripping of cadmium and zinc with di-(2-ethylhexyl)-dithiophosphoric acid(D2EHDTPA)in toluene and by D2EHDTPA-trioctylamine in toluene were investigated.The constant molar extraction
infrared spectrum analysis and nuclear magnetic resonance spectrum analysis confirmed that the probable structures of extracted complexes were CdA_2 and ZnA_2.Cadmium can be extracted very easily by D2EHDTPA.Cadmium is almost completely extracted
but stripping of cadmium from the organic phase is very difficult.With the newly developed synergistic extraction system of D2EHDTPA-TOA
high selectivity for the extraction of cadmium from zinc sulfate solution and easy stripping of cadmium from the organic phase can be obtained.Kinetic study showed that the interfacial reactions were the extraction rate determining steps of the extraction process.