Russian Academy of sciences Ural Branch

A. I. Okunev, Leading Scientific Associate, 8(343)267-89-16

Chain mechanism of sulphides oxidation had been scientifically proved and experimentally confirmed. The lowest sulphides appear to be oxidized with intermediate oxi-sulphide MeSO₂ complex formation. The complex then decays by МеО and sulfur monoxide SO(g). At low temperatures, when SO and SO₂ has no place, sulphides oxidation is realised with oxi-sulphides MeSO₃ and MeSO₄ formation. It was emphasized, that lowest sulphides oxidation is related to category of chain reactions with unbranched chains. Higher sulphides oxidation (for example FeS₂) is realized with branching of chains. Due to this process, the oxidation has explosive nature and the primary act of it is the pyrite dissociation with the following elementary sulfur oxidation by the chain mechanism. Results of researches are confirmed by pilot and semiindustrial tests on roasting and melting of copper-zinc concentrates, ores and technogenic raw materials that has allowed to offer new devices and technologies on roasting and autogenous fusion of sulphidic materials. The developed theory of sulphides oxidation by the chain mechanism and its results have no analogues abroad.

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