Abstract
This paper reports on a study of the thermal activation of coal tailings in order to increase the intrinsic reactivity of this material. Thermal treatment was carried out in a furnace with an inert atmosphere in the temperature range from 100 to 1000°C. The changes in the material following the treatment were determined by X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry. In order to verify the true reactivity of the activated material, leachings with standard solutions of HCl were made and the yield of the aluminium extraction process was determined.
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