HYDROMETALLURICAL EXTRACTION OF ZINC AND LEAD FROM CINKUR LEACH RESIDUE

摘要

In this study, zinc and lead recovery from zinc plant leach residue obtained from Cinkur using hydrometallurgical methods have been investigated by laboratory scale experiments. Considering more than one million tons leach residue (LR) rich in Zn (12.43%) and Pb (15.51%) in the stockyard and environmentally hazardous, it is essentially necessary to process Cinkur LR. Zinc and lead have been recovered in two main stages. As a first step, Cinkur LR was releached by using hot sulphuric acid for zinc recovery. About 72 % Zn was recovered by using 150 g/l H_2SO_4 at 95°C in 2 hours with a pulp density of 200 g/l. Secondly, for lead recovery brine (NaCl) leaching tests were performed on the secondary Cinkur LR obtained after acid leaching process. In brine leaching while lead recoveries up to 95 % could be attained at a low pulp density, the maximum recovery obtained was 84.9 % at a high pulp density (200 g/l) with 300 g/l NaCl concentration in 10 minutes at 95°C.