Abstract
Thermoanalytical techniques (DTA, DTG, TG), chemical and X-ray diffraction methods have been combined to study the course of oxidation of synthetic iron pyrite in a dynamic air atmosphere. Formation of ferrous sulphate by direct oxidation of pyrite was favoured upto 270°, followed by interaction of pyrite with ferrous sulphate, direct oxidation to ferric oxide and decomposition of iron sulphates. Oxidation of pyrite was greatly enhanced in presence of silica. The role of silica was studied through thermal analysis of synthetic pyrite in presence of silica and its effect on product distribution. Silica facilitated the oxidation of pyrite through adsorption of oxygen. The catalytic effect was not due to moisture or phase transition in silica.
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