Roasting The objective is usually to remove(or diminish) the sulfur content of a concentrate by oxidation. E g for a lead concentrate 2PbS+ 302=2PbO2+ sO2 Such reactions are typically exothermic and the heat produced is usually sufficient to bring the reactants up to reaction temperature. The equipment is illustrated in the next four slides(see reader for details)Roasting. The objective is usually to remove (or diminish) the sulfur content of a concentrate by oxidation. E.g for a lead concentrate: 2PbS + 3O2 = 2PbO2 + SO2 Such reactions are typically exothermic and the heat produced is usually sufficient to bring the reactants up to reaction temperature. The equipment is illustrated in the next four slides (see reader for details)