论文部分内容阅读
The extraction of cadmium and zinc with di-(2-ethylhexyl)-dithiophosphoricacid(D_2EHDTPA)-toluene and D_2EHDTPA-trioctyl amine(TOA)-toluene has been investigated.In-frared spectrum analysis,the nuclear magnetic resonance spectrum(NMR)analysis and conductivitymeasurements confirm that the probable structures of the extracted complexes are CdA_2 and ZnA_2.Cadmium can be extracted by D_2EHDTPA very easily.Almost all the cadmium can be extracted,but stripping of cadmium from the organic phase is very difficult.When a mixture of D_2EHDTPAand TOA is used,selective extraction of cadmium from zinc sulfate solution can be achieved.Cad-mium can be easily stripped from the organic phase.
The extraction of cadmium and zinc with di- (2-ethylhexyl) -dithiophosphoric acid (D_2EHDTPA) -toluene and D_2EHDTPA-trioctyl amine (TOA) -toluene has been investigated. In-frared spectrum analysis, the nuclear magnetic resonance spectrum (NMR) and conductivity measuresments confirm that the probable structures of the extracted complexes are CdA_2 and ZnA_2.Cadmium can be extracted by D_2EHDTPA very easily. Almost all the cadmium can be extracted, but stripping of cadmium from the organic phase is very difficult.When a mixture of D_2EHDTPAand TOA is used, selective extraction of cadmium from zinc sulfate solution can be achieved. Cad-mium can be easily stripped from the organic phase.