Hydrometallurgical Process and Kinetics of Leaching Manganese from Semi-Oxidized Manganese Ores with Sucrose.

The extraction of manganese from a semi-oxidized manganese ore was investigated with sucrose as the reducing agent in dilute sulfuric acid medium. The kinetics of leaching manganese from the complex ore containing MnCO3 and MnO3 was also investigated. The effects of sucrose and sulfuric acid concentrations, leaching temperature and reaction time on the totalMn (TMn), MnO3 and MnCO3 leaching were investigated. Results showed that MnCO3 could more easily react with hydrogen ions than MnO3 in ores, and MnO3 decomposition could be advantageous for MnCO3 leaching. The leaching efficiencies of 91.8% for total Mn, 91.4% for MnO3 and 96.9% for MnCO3 were obtained under the following optimized conditions: 0.035 mol/L sucrose concentration, 5 mol/L sulfuric acid concentration, 60 min of reaction time and 363.2 K of leaching temperature. In addition, it was found that the leaching process of semi-oxidized manganese ore follows the shrinking core model and the leaching rate was controlled by chemical reaction and diffusion. The apparent activation energy of the total manganese, MnO3, and MnCO3 leaching were 40.83, 40.59, and 53.33 kJ.mol-1, respectively. [ABSTRACT FROM AUTHOR]