Abstract
The purpose of this work was to determine the possibility of using chemical reaction heat when roasting substandard copper concentrates.Dead roasting of rough pellets of copper sulphide concentrate has been studied through differential thermal analysis. The thermograms of the pellets have two distinct thermal effects. The first effect – endothermic – corresponds to the physical removal of moisture. The second peak – exothermic – is due to oxidation of the sulfide mineral component of copper concentrate. We have obtained the apparent activation energy value of 166.280 kJ·mol which indicates limitation of the process by kinetic copper sulfide sulphatisation. The apparent activation energy value was moisture 27.713 kJ·mol. The value corresponds to limitation of the internal diffusion process.
With evaluation of the thermal performance of the calcined process, it has been established that drying heat losses can be almost completely compensated when the copper content in sulfidic concentrate amounts to about 10%, while sulphatizing roasting ensures the complete use of chemical reaction heat for the process, which can be considered at developing an optimal roasting control condition.
Keywords: Pellets, derivatograms, heating rate, characteristic curve.
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