INVESTIGATION OF THE KINETICS AND MECHANISM OF THERMAL DEGRADATION OF EGGSHELLS AS A POTENTIAL RAW MATERIAL RESOURCE

The kinetics and mechanisms of chemical reactions involved in the decomposition of eggshells are studied using experimental (thermogravimetric analysis and differential thermal analysis), as well as theoretical models. The presence of the calcite phase in the raw eggshell and the gradual formation of calcium oxide from it during firing has been confirmed experimentally. Recycled eggshells demonstrate better crystallinity compared to commercial calcium carbonate. It is proved that eggshells can be used directly as a catalyst, adsorbent and as a raw material for the synthesis of value-added materials, which reduces energy consumption and minimizes the impact on the natural environment by recycling the inevitable waste of the food industry.