pH effect on zinc recovery from the spent pickling baths of hot dip galvanizing industries

Comparing the behaviour between the reactor under pH control and that in the presence of an anion-exchange membrane, reflects zinc conversion values slightly higher for the membrane reactor due to the zinc precipitation occurring in the reactor under pH control, which is higher as the pH rises. However, the specific energy consumption is considerably higher in the membrane reactor mainly due to the ohmic drop introduced by the membrane.