A description is given of a reduction roasting process that does not entail the production of sulfur dioxide. The study consisted in the screening of various reduction reactions that a sulfide mineral - chalcopyrite, chalcocite, pyrrhotite or pentlandite - undergoes with a reductant - hydrogen, carbon monoxide or carbon - in the presence of a desulfurizer - calcium oxide or sodium carbonate. The screening of the reduction reactions was carried out by means of a thermogravimetric analysis technique in a constantly rising temperature mode. The results show that the sulfide minerals can be reduced readily to metallic form by carbon, carbon monoxide or hydrogen in the presence of such desulfurizing agents as calcium oxide or sodium carbonate without the production of sulfur dioxide. In all reactions the sulfur was captured either as calcium sulfide or as sodium sulfide, either of which can be separated readily from the metallics.
|Original language||English (US)|
|Number of pages||3|
|Journal||Transactions of the Institution of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy|
|State||Published - Jun 1984|