Abstract
The conditions for the direct carbothermic reduction of metals from mixtures of sulfides Cu1.96S and FeS with calcium oxide are studied using thermogravimetric and thermal analyses combined with mass spectrometry of the formed gases. The metal reduction in a mixture of FeS and CaO on heating to 1250°C is shown to occur with the formation of intermediate oxysulfide phases almost without the evolution of sulfur-containing gases. The formation of SO2 is observed in a mixture of Cu1.96S and CaO at temperatures higher than 550°C. The introduction of FeS into the reaction mixture of Cu1.96S and CaO enhances the completeness of metal reduction by carbon, decreases the temperatures of the intense processes, and suppresses sulfur dioxide evolution.
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