Influence of firing temperature on the phase composition of ceramic sample clay with dearsenization cake

The phase composition at different firing temperatures of a ceramic sample obtained from Sukpak clay and dearsenization cake from the «TuvaCobalt» waste sludge plant has been studied. Between 800-900 °C a new phase - nepheline NaAlSiO4 - is found in the ceramic clay-cake samples. At the optimum firing temperature of 900 °C the absence of arsenic compound phases and the presence of clinoenstatite, akermanite, quartz, plagioclase, which determine the high strength of the material in the resulting system, have been established in the samples.