From waste to added-value product: A case of efficient separation and recovery of zinc and iron from spent galvanizing acid  

作　　者：Jiguo Tu Xin Feng Bokun Zhang Libo Chen 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing,100083,PR China [2]Jianlong Group&USTB Joint Laboratory,University of Science and Technology Beijing,Beijing,100083,PR China

出　　处：《Progress in Natural Science:Materials International》2024年第4期702-709,共8页自然科学进展·国际材料(英文版)

基　　金：financially supported by the Fundamental Research Funds for the Central Universities(FRF-TP-18-003C2)

摘　　要：Spent galvanizing acid solution contains high concentrations of zinc salts,ferrous salts,and residual acids,exhibiting extremely high value-added recovery potential.However,achieving the efficient extraction and separation of Zn over Fe becomes particularly challenging under elevated Zn ion concentration.Here,the key extraction parameters,such as modifier ratio,Cyanex 923 concentration and ratio of organic phase to aqueous phase(O/A),are investigated.The stripping and regeneration of extractant,extraction mechanism,as well as high-value recovery of Zn and Fe resources are also comprehensively expounded.After the two-stage extraction,the extraction efficiency of Zn and Fe is 98.92%and 2.09%,respectively.Moreover,the stripping efficiency of Zn reaches 92.3%with O/A ratio of 1:2,using oxalic acid as stripping agent.The predominant extracted species is confirmed to be ZnCl_(3)^(-),resulting in the formation of HZnCl_(3)·R_(3)PO complex.More importantly,the regenerated extractant can be recycled back into the extraction process,and the reproduced HCl,high-value recovered ZnO and Fe_(2)O_(3)can be used for different industrial fields.These findings lay a solid foundation for the efficient separation and comprehensive recovery of high-concentration spent galvanizing acid solution.

关 键 词：Zinc recovery Iron recovery Solvent extraction Spent galvanizing acid Extraction efficiency 

分 类 号：TF56[冶金工程—钢铁冶金] TF813[环境科学与工程—环境工程] X781.1