| 摘要 |
A process for the conversion of insoluble sulphide minerals into soluble sulphate compounds and other compounds which includes subjecting a mixture of a sulphide mineral and a suitable reagent to mechanical activation with or without thermal treatment to increase the chemical reactivity of the reactants and/or reaction kinetics such that a chemical reaction will occur which produces compounds that can be more readily processed to extract a metal from the sulphide mineral. The process of the invention is based on the discovery that mechanical activation with or without thermal treatment, can induce chemical reactions between sulphide minerals and certain reactants at low temperatures which cause the chemical breakdown of the sulphide grains. Such reactions, while thermodynamically favoured, generally were previously not thought to occur at temperatures less than that required for the formation of sulphur dioxide, because of kinetic limitations. The process provides an improved process for the treatment of sulphide minerals, which is more environmentally acceptable, and was also developed with a view to providing an improved lower cost process for the treatment of refractory gold ores and concentrates, which facilitates maximum recovery of the gold.
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