Abstract
This article studies the possibility of the use of red bauxite sludge of JSC «Aluminium of Kazakhstan» and fly ash from energy production of the Pavlodar region in construction ceramics. Refractory clay from the Kemertuz deposit, located 250 km away from Pavlodar, was used as a binder. The samples were prepared with additives of red mud and a combination of red mud with fly ash from Pavlodar CHP-1, which is a low-calcium variety of acidic ash with a high content of aluminum oxide. These materials were molded by the plastic molding method. The following physicochemical properties of raw materials and obtained samples were studied: (i) air and fire shrinkage, (ii) water absorption, (iii) compressive strength, and (iv) chemical composition. Based on the obtained results, a comparative analysis of samples with the addition of red mud and a combination of red mud and fly ash was made. This allowed us to determine the optimal composition of ceramic masses and firing process parameters. Keywords: red mud, fly ash, ceramic materials, Pavlodar CHP-1, energy waste.