Abstract
Zinc sulfide pressure leaching in sulfuric acid is associated with elemental sulfur formation, which melts at temperatures higher 113 oC and covers sulfide minerals surface. Addition of surfactants to leaching pulp decreases minerals wetting by molten sulfur. This paper represents results of zinc sulfide concentrate pressure leaching in presence of sodium dodecyl sulfate (SDS). The leaching experiments indicated that SDS inhibits zinc sulfide dissolution in the first 20–80 minutes at low SDS concentrations (0.2, 0.4 g L−1) and temperatures (120, 130 oC). In spite of this delay total zinc extraction was the same as without SDS addition. At CSDS=0.6 g L−1 zinc extraction was 12 % greater than in absence of the surfactant. In presence of SDS the leaching mechanism changed from diffusion to chemical mode.
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