Abstract
The aim of the study is to select the optimal composition of the sintering charge for maximum extraction of alumina. The experiments have shown that sintering using two-component charges allows to extract alumina from the obtained sinters by no more than 60%. The highest sintering rates were obtained using three-component charges. Thus, when using ash and slag waste from Almaty CHPP-2, the extraction of alumina amounted to 83.68% on the charge of the composition CaO : SiO2 = 2; Na2O : (Al2O3 + Fe2O3) = 1 during sintering in the interval of 60 minutes at a temperature of 1200°С, under the same conditions, 87.07% recovery was obtained for ash and slag waste of the Eurasian Energy Corporation, for ash and slag waste after chemical activation, recovery was – 90.2%. The experiments have shown that the production of self-disintegrating sinters suitable for further processing from the tested samples of ash and slag waste is possible with the use of three-component charges