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Utilization methods of spent hydrochloric acid from hot dip zinc galvanizing

Miesiąc I.

Polish Journal of Chemical Technology

2003

Vol. 5, nr 4

34-36

Three methods were used for zinc removal from spent hydrochloric acid containing 3.06 mol/1 HC1, 79.8 g/1 Fe(II), 4.84 g/1 Zn(II). In bulk liquid membrane system using 80% tributyl phosphate in kerosene as a membrane phase, it was possible to separate Zn(II) with the initial flux of 0.40 mol/m2 h. The process was strongly disturbed by the competitive transport of Fe(III) if present. Diffusion dialysis enabled to separate very effectively Fe(II) with separation factor over 100 in relation to Zn(II), but Zn(II) was transported together with HC1 with flux values of 0.55 and 19.6 mol/m2h, respectively (membrane FT FAD, Fuma Tech). Anion exchange using both strong basic Lewatit M500 and weak basic Lewatit MP64 (Bayer) absorbed effectively Zn(II) with exchange capacity 0.65 and 0.85 mol Zn/L, respectively. Regeneration with water enabled to recover 70 - 80% of absorbed zinc in the solution containing 13 - 15 g/1 Zn(II) and 0.01 - 0.4 g/1 Fe(II).