CIESC Journal

• 化工学报 • 上一篇    下一篇

用二(2-乙基己基)二硫代磷酸-三辛胺协萃体系分离锌和镉

卢立柱,张大力,柯家骏,谢慧琴   

  1. 中国科学院化工冶金研究所!北京100080,中国科学院化工冶金研究所!北京100080,中国科学院化工冶金研究所!北京100080,中国科学院化工冶金研究所!北京100080
  • 出版日期:1998-10-25 发布日期:1998-10-25

SEPARATION OF CADMIUM AND ZINC WITH MIXTURE OF DI-(2-ETHYLHEXYL)-DITHIOPHOSPHORIC ACID AND TRIOCTYLAMINE

Lu Lizhu;Zhang Dali;Ke Jiajun;Xie Huiqin(Institute of Chemical Metallurgy,Chinese Academy of Sciences,Beijing 100080)   

  • Online:1998-10-25 Published:1998-10-25

摘要: 分别应用二(2-乙基己基)二硫代磷酸(D2EHDTPA)和D2EHDTPA-三辛胺(TOA)协萃体系进行了锌、镉分离的研究。D2EHDTPA萃取锌和镉的等摩尔系列法、红外光谱、核磁共振的测试结果表明,萃合物的组成可能为CdA_2和ZnA_2。应用D2EHDTPA-甲苯体系时,镉容易完全萃取,但有机相中的镉很难反萃下来。应用D2EHDTPA和TOA组成的协萃体系时,镉能从硫酸锌溶液中选择性萃取,也能很容易地从有机相中反萃下来,实现镉与锌的分离。萃取速度的控制步骤是界面反应。

Abstract: 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.

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