Abstract
A process for purifying an ammoniacal complex sulphide leach liquor through a cementation route using pure zinc is described. Purification of the leach liquor is mandatory in order to improve the quality of electrowon zinc. The cementation studies were carried out using a rotating zinc disc. Various parameters such as rotation speed and the effect of copper ion vis-à-vis the cementation of cadmium, cobalt and nickel were studied. The presence of copper gives a marked improvement in the cementation of cobalt and nickel whereas cadmium cementation shows a negative trend. With an increase of rotation speed of the zinc disc, the rate of cementation becomes faster. Initially the cementation rate is faster and with time the rate falls off. The cementation of cadmium is much faster than that of cobalt and nickel.
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