Abstract
The reaction of metal sulfides in oxidizing atmospheres is an important stage in the extraction of copper, lead and zinc. Sulfide concentrates are usually roasted in air to the desired degree of oxidation and then treated further in a hydrometallurgical or pyrometallurgical process. An experimental method was developed in which the oxidation rates are controlled by the diffusion of reaction gas to the sample surface. The rate of weight change is related to the flux of reaction and product gas, including condensed reaction products, by means of an analytical formulation for each specific reaction stoichiometry. The method can be used to determine the exact reaction sequence during oxidation and the phase relationships that occur during the reaction process.
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