Slag resistant and refractory ceramic compositions in MgO – Al<sub>2</sub>O<sub>3</sub> – SiO<sub>2</sub> system on the base of local raw materials of Uzbekistan
Abstract
Abstract Forsterite and spinel-corundum ceramic materials were obtained in the MgO-Al 2 O 3 -SiO 2 system based on local raw materials of Uzbekistan - talc-magnesite of Zinelbulak deposit, kaolin of Angren deposit and inorganic additives (fused periclase PPE-87, electric fused corundum). The formations of various phases were studied using XRD and SEM-EDS. Study of chemical-mechanical properties of ceramic samples showed that spinel-corundum composition have density from 2520 to 2770 kg/m 3 , water absorption rate from 10.52 to 11.71%, open porosity from 27 to 31%, apparent density from 2420 to 2750 kg/m 3 , compressive strength from 100 to 120 MPa, characterized by increased refractoriness (it was 1750 °C for forsterite ceramic materials, for spinel-corundum more than 1800 °C) and slag resistance under metallurgy slags. The synthesis of spinel in optimal compositions occurs at 300 °C lower than the traditional sintering temperature of spinel products, which contributes to significant energy savings in the synthesis of highly refractory spinel-corundum materials.