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| 1 | Study on hydrometallurgical process and kinetics of manganese extraction from low-grade manganese carbonate ores显示文摘In order to utilize low-grade manganese ore resources effectively, a hydrometallurgical process was developed for manganese extraction in dilute sulfuric acid medium, and the kinetics of leaching manganese was also investigated. At room temperature, manganese from low-grade manganese carbonate ores was extracted by sulfuric acid leaching without reductants. During the extracting process, single-factor analysis method was used to evaluate the effects of grinding fineness, sulfuric acid concentration,liquid-to-solid ratio, agitation rate and leaching time on the leaching efficiencies of Mn and Fe. The optimal leaching conditions are determined as coarse particles of below 2 mm size(without ball-milling),sulfuric acid concentration of 0.86 mol/L, liquid-to-solid ratio of 5:1, agitation rate of 150 r/min and leaching for 180 min at room temperature. Under the optimal conditions, the leaching efficiencies of Mn and Fe are 96.21% and 13.35%, respectively. In addition, through the experiments at different temperatures, it is found that the leaching process follows the shrinking core model under the conditions of changing acid concentration and intermittent reaction device. Moreover, the apparent activations of effective diffusion and chemical reaction in the kinetic model are calculated to be 18.83 and27.15 kJ/mol, respectively. | Liu Youcai Lin Qingquan Li Lifeng Fu Jiangang Zhu Zhongsi Wang Chongqing Qian Dong | 2014 | International Journal of Mining Science and Technology2014，24，4： | 6 |
| 2 | Evaluation of reduction roasting and magnetic separation for upgrading Mn/Fe ratio of fine ferromanganese显示文摘 | | 2013 | International Journal of Mining Science and Technology2013，23，4： | 3 |
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