Application of Magnesite Waste in Manufacturing High-strength Ceramics

Factories of the Republic of Tatarstan produce about 3 million tons of industrial waste per year. The solution of problem of utilization and processing of industrial waste is to reuse them in the production of ceramics. Currently, however, not all the waste is investigated and can be used repeatedly in industry. The article provides an analysis of magnesite waste, reveals its qualitative and quantitative composition. The effect of the additives from this waste is studied on the following types of clay: fusible clay from Alekseevsky field, refractory clay of Novoorsky field, clay of Salmanovsky field with high carbonate content. In the study we used the following methods: X-ray phase analysis (diffractometer XRD-7000S (Shimadzu, Japan), diffractometer D2 Phaser (Bruker, Germany)), electron microscopy (EVO-50XVP microscope), measurement of basic physical and mechanical properties (press SGP-500 CIM 4 SKB, Stroypribor, Russia, and others). Tests were conducted under identical conditions with the addition of pure magnesium oxide; however, the positive results were not found. Modification of Salmanovsky and Novoorsky clay fields with magensite waste also did not lead to the improvement of the characteristics of the samples. On the contrary, in the ceramic mass compositions based on clay of Alekseevsky field we established the feasibility of using magnesite waste in the range from 2 to 5 % by weight at a burning temperature of 1150 °C for the production of high-strength ceramics.