G A Ayashim, J Adukwu, H Uthman (2019). Kinetics Studies of Quicklime Production from Calcined Oyster Shell using Mampel’s Rate Law. International Journal of Engineering & Research Technology, Vol. 10, No. 5, 127–142

Abstract

Calcium oxide (CaO) is accepted as on effective ll adsorbent of carbon dioxide (CO2) and it is commonly used in biodiesel production. Calcium carbonate (CaCO3) sources, such as limestones that are obtained through mining and quarrying, usually produce CaO. CaO is produced via thermal decomposition. However, this research has been able to use the vast available waste resources for CaCO3 and CaO in Nigeria, which are Oyster shells. Kinetic study of the thermal decomposition of the Oyster shell using Mampel’s power rate law. The model was then used to study the effect of oyster shell particle size, calcination time and calcination temperature on activation energy of the thermal decomposition of the shell in a calciner, it was found that while the activation energy of thermal decomposition of Oyster shell decreased from 169.164958kJ/mol to 128.1852 kJ/mol as the particle size of Oyster increased from o.3 to 180 min, and the activation energy of thermal decomposition of Oyster shell decreased from 150.84 kJ/mol to 11.7543332kJ/mol as the calcination temperature of Oyster increased from 600oC min to 900oC. To conclude, a promising source of CaO is the Oyster shell, which provides the largest decomposition rates for small particle size, higher calcination temperature and higher residence time