Abstract
A sample of covellite of particle size 45–90 µm was heated in air at 20°C min–1 in a simultaneous TG-DTA apparatus. The phase compositions of the products at various temperatures were determined quantitatively by XRD and FTIR. By 500°C, 5.8% of Cu2 O had formed, and this increased to a maximum of 44.8% at 585°C after which it decreased to zero by 750°C. 10% of CuO had formed by 680°C, and then steadily increased to 83.6% at 1000°C. 5.9% of CuO⋅CuSO4 was found at 610°C, and increased to a maximum value of 79% after which it decomposed completely by 820°C.
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