Abstract
As an alternative hydrometallurgical route, the complex sulphide concentrates (Zn, 18%; Cu, 3.5% and Pb, 9%) from Ambamata were leached in FeCl 3 solution. The resultant leach solution contained Zn, 7.3; Cu, 0.54; Pb, 1.35 g/l, besides iron (of which 67% was Fe(II) state). In order to recover copper from the leach liquor, cementation with mild steel, iron turnings, electroplated nickel, aluminium and lead substrates was studied. With iron turnings, more than 95% of the copper from the leach solution could be recovered at room temperature, pH 2.06 and air flow rate of 33–50 ml/s. Cementation could also be done on mild steel and aluminium substrates. The liquor after cementation contained lead and zinc as well as iron (mostly as Fe(II)) and is therefore suitable for further solvent extraction of lead and zinc.
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