Abstract

In this study, maximum recovery of zinc and minimum recovery of iron from shaking table residue has been investigated. The residue is discarded as tailing of shaking table Tajkooh processing zinc–lead carbonate ores. The zinc plant residue containing 14.67% Zn, 5.93% Pb, and 10.47% Fe was blended with H2SO4. The orthogonal array L9 (34) comprising four parameters at three levels was chosen. The parameters and their levels were as: pH : 1, 1.5 and 2; time : 30, 45 and 60 min; temperature : 40, 60 and 80 ºC; and solid/liquid ratio: 1:4, 1:6 and 1:8. The ultimate optimum leaching conditions were found to be Temperature :80 ºC , solid/liquid ratio : 1:8, time : 60 min and pH=1. Under these conditions, recovery for zinc and iron was 83.5% and 1.3%, respectively. It was observed that the leaching rate of zinc increased with increasing temperature and time and decreasing pH without influence of S/L.

 Key words : Zinc, Iron, Leaching, Design Expert software.

 IMCET conference, Turkey 2011.