Abstract
Abstract Manganese leaching during high concentration flue gas desulfurization process with semi-oxidized manganese ore was studied in this paper. It was found that there were different reaction pathways among which MnO2, Mn2O3 and MnCO3 in semi-oxidized manganese ore during flue gas desulphurization and manganese leaching. High SO2 concentration facilitated redox reaction between MnO2 and SO2, and high concentration of H2SO4 accelerated MnCO3/Mn2O3 leaching from semi-oxidized ore. Kinetics study showed that manganese leaching in flue gas desulfurization process with semi-oxidized ore was controlled by a mixed-control model, that is the surface chemical reaction and mass diffusion dominated both the oxidation of SO2 and manganese leaching process. The apparent activation energy was 13.05 kJ·mol−1 and the reaction orders with respect to SO2 and H2SO4 concentration were 1.38 and 0.10, respectively. Finally, a semi-empirical rate equation based on shrinking core model was derived to describe the process.
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