The applicability of carbon dioxide pressure leaching for the extraction of magnesia of high purity from low grade magnesites and waste dumps material has been investigated. Factors which influence the magnesia recovery such as time, temperature, pressure, particle size, solid/liquid ratio and calcination temperature have been studied and optimum values were determined. The kinetic data were examined according to the rate equation -ln(1 - α) against t and the activation energy of 26.4 kJ mol-1 (6.3Kcal mol-1) suggested that the kinetics of the reaction are controlled by surface chemical reaction.
- carbon dioxide
- pressure leaching