Extraction and Separation of Cadmium and Zinc with a Mixture of Di-(2-Ethylhexyl)-Dithiophosphoric Acid and Trioctyl Amine  

作　　者：卢立柱 张大力 谢慧琴 柯家骏 

出　　处：《Chinese Journal of Chemical Engineering》1999年第2期132-138,共7页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.59474009).

摘　　要：The extraction of cadmium and zinc with di-(2-ethylhexyl)-dithiophosphoric acid(D2EHDTPA)-toluene and D2EHDTPA-trioctyl amine(TOA)-toluene has been investigated. Infrared spectrum analysis, the nuclear magnetic resonance spectrum(NMR) analysis and conductivity measurements confirm that the probable structures of the extracted complexes are CdA2 and ZnA2. Cadmium can be extracted by D2EHDTPA very easily. Almost all the cadmium can be extracted, but stripping of cadmium from the organic phase is very difficult. When a mixture of D2EHDTPA and TOA is used, selective extraction of cadmium from zinc sulfate solution can be achieved. Cadmium can be easily stripped from the organic phase.The extractlon of cadmium and zinc with di-(2-ethylbexyi)-dithiophosphoric acid(D2EHDTPA)-toluene and D2EHDTPA-trioctyl amine(TOA)-toiuene has investiated. in-frared spectrum analsis,the nuclear magnetic resonance spectrum(NMR) analysis and conductivity measurements confirm that the probable structures of the extracted complexes are CdA2 and ZnA2, Cadmium can be extracted by D2EHDTPA very eui]y. Almost all the cadmium can be extracted, but stripping of cadmium from the organic phase is very difficult. When a mLxture of D2EHDTPA and TOA is used, selective extraction of cadmium from zinc sulfate solution can be achieved. Cad-mium can be easily stripped from the organic phase.

关 键 词：ZINC CADMIUM solvent extraction thiophosphoric acid 

分 类 号：TQ132.44[化学工程—无机化工] TQ028.32