Membrane extraction-stripping process for zinc(II) recovery from HCl solution

The recovery of zinc(II) with tributyl phosphate and CYANEX(R)923 from mode l HCl solutions was studied. Classical dispersive extraction, and none-disp ersive extraction in a two compartment BLM cell and in two parallel hollow fiber modules were investigated. It was found that zinc(II) can be recovere d from HCl solutions with tributyl phosphate both in extraction and membran e processes. CYANEX(R)923 is too strong extractant to achieve effective str ipping. A blocking of the membrane-strip interface is observed in bulk liqu id membrane experiments. An addition of TBP does not improve the extraction -stripping characteristics of CYANEX(R)923.