Hybrid membrane process for the recovery of major components (zinc, iron and HCl) from spent pickling effluents

Industrial effluents with an average composition of 1.2 kmol/m3 of Zn, 1.6 kmol/m3 of Fe, and 6.5 kmol/m3 of HCl were previously used to analyse the kinetics of the metallic separation with the emulsion liquid membranes; this study reports the experimental and theoretical analysis of membrane dialysis of the stripped solution; the influence of operative variables such as concentration of HCl (0.5 to 3.0 kmol/m3) and ZnCl2 (0.25 to 1.0 kmol/m3), type of the anion-exchange membranes, and the basicity of the stripping agent on the dialysis flux and selectivity has been analysed.