Abstract
Zinc sulphide leaching is an example of an oxidative, acid pressure leaching process that must be followed by neutralization of excess acid, in this case to remove iron from solution. The leaching behaviour of a zinc sulphide concentrate in moderately acidic solutions (35 g/l H 2SO 4) has been studied at temperatures from 110° to 180°C to determine the extent of neutralization that can be achieved by the reaction: ZnS+2 H ++ 1 2 O 2= Zn 2++ H 2O+ S 0 Extensive neutralization was observed at 150°C, even at pH values well outside of the thermodynamic stability region of sulphur. Neutralization was less effective at the other temperatures. Iron precipitated from solution as jarosite. The lead and silver content of these jarosites decreased markedly with increasing temperature. Substitution of other metals in jarosites was studied in hydrolysis tests, and also decreased with increasing temperature.
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