In this report, the writer dealt chiefly with the sulphatizing actions which take place during the roasting of zinc ores and an attempt was made to explain in detail the mechamisms of the formation and decomposition of the zinc sulphate based upon the theoretical considerations of the equilibrium relations between the oxides, sulphates, sulphide and gases.
The effects of the presence of impurities, complising iron, copper and lead minerals were studied mainly with the therm obalance. Besides the effects of iron oxide which had often been emphasized, copper compounds were found to favour the formation of zinc sulphate in an outstanding manner.
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