首页|From waste to added-value product:A case of efficient separation and recovery of zinc and iron from spent galvanizing acid
From waste to added-value product:A case of efficient separation and recovery of zinc and iron from spent galvanizing acid
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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 sep-aration 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 ZnCl3-,resulting in the formation of HZnCl3·R3PO complex.More importantly,the regenerated extractant can be recycled back into the extraction process,and the reproduced HC1,high-value recovered ZnO and Fe2O3 can be used for different industrial fields.These findings lay a solid foundation for the efficient sep-aration and comprehensive recovery of high-concentration spent galvanizing acid solution.
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NSTL
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