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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 | 用贫碳酸锰矿制备工业硫酸锰的工艺研究显示文摘介绍了以贫碳酸锰矿为原料,采用硫酸直接酸浸法制备工业级硫酸锰的工艺流程,详细讨论了影响锰浸出的各种因素。试验结果表明:在酸矿比为0.45、浸出温度为90℃、反应时间为4 h、液固比为4∶1和转速为300 r/min条件下,锰浸出率高达97.44%。浸出液经净化除杂、浓缩结晶后,得到纯度为98.3%的工业级硫酸锰产品。 | 胡亮 张著 李婕 杨文 秦红 王智友 | 2016 | 湖南有色金属2016，32，6： | 4 |
| 3 | Preparation of manganese sulfate from low-grade manganese carbonate ores by sulfuric acid leaching显示文摘In this study, a method for preparing pure manganese sulfate from low-grade ores with a granule mean size of 0.47 mm by direct acid leaching was developed. The effects of the types of leaching agents, sulfuric acid concentration, reaction temperature, and agitation rate on the leaching efficiency of manganese were investigated. We observed that sulfuric acid used as a leaching agent provides a similar leaching efficiency of manganese and superior selectivity against calcium compared to hydrochloric acid. The optimal leaching conditions in sulfuric acid media were determined; under the optimal conditions, the leaching efficiencies of Mn and Ca were 92.42% and 9.61%, respectively. Moreover, the kinetics of manganese leaching indicated that the leaching follows the diffusion-controlled model with an apparent activation energy of 12.28 k J·mol^(-1). The purification conditions of the leaching solution were also discussed. The results show that manganese dioxide is a suitable oxidant of ferrous ions and sodium dimethyldithiocarbamate is an effective precipitant of heavy metals. Finally, through chemical analysis and X-ray diffraction analysis, the obtained product was determined to contain 98% of MnSO_4·H_2O. | Qing-quan Lin Guo-hua Gu Hui Wang Ren-feng Zhu You-cai Liu Jian-gang Fu | 2016 | International Journal of Minerals,Metallurgy and Materials2016，23，5： | 3 |
| 4 | Hydrometallurgical leaching and kinetic modeling of low-grade manganese ore with banana peel in sulfuric acid显示文摘Manganese was leached from a low-grade manganese ore(LGMO)using banana peel as the reductant in a dilute sulfuric acid medium.The effects of banana peel amount,H2SO4 concentration,reaction temperature,and time on Mn leaching from the complex LGMO were studied.A leaching efficiency of~98%was achieved at a leaching time of 2 h,banana peel amount of 4 g,leaching temperature of 120°C,manganese ore amount of 5 g,and sulfuric acid concentration of 15vol%.The phase,microstructural,and chemical analyses of LGMO samples before and after the leaching process confirmed the successful leaching of manganese.Furthermore,the leaching process followed the shrinking core model and the leaching rate was controlled by a surface chemical reaction(1−(1−x)^1/3=kt)mechanism with an apparent activation energy of 40.19 kJ·mol^−1. | Sajjad Ali Yaseen Iqbal Inamullah Khan Ansar Ullah Muhammad Sadiq Muhammad Fahad Khizar Hussain Shah | 2021 | International Journal of Minerals,Metallurgy and Materials2021，28，2： | 3 |
| 5 | Reductive leaching of manganese from low-grade pyrolusite ore in sulfuric acid using pyrolysis-pretreated sawdust as a reductant显示文摘Manganese(Mn) leaching and recovery from low-grade pyrolusite ore were studied using sulfuric acid(H_2SO_4) as a leachant and pyrolysis-pretreated sawdust as a reductant. The effects of the dosage of pyrolysis-pretreated sawdust to pyrolusite ore, the concentration of sulfuric acid, the liquid/solid ratio, the leaching temperature, and the leaching time on manganese and iron leaching efficiencies were investigated. Analysis of manganese and iron leaching efficiencies revealed that a high manganese leaching efficiency was achieved with low iron extraction. The optimal leaching efficiency was determined to be 20wt% pyrolysis-pretreated sawdust and 3.0 mol/L H_2SO_4 using a liquid/solid ratio of 6.0 mL /g for 90 min at 90°C. Other low-grade pyrolusite ores were tested, and the results showed that they responded well with manganese leaching efficiencies greater than 98%. | Ya-li Feng Shi-yuan Zhang Hao-ran Li | 2016 | International Journal of Minerals,Metallurgy and Materials2016，23，3： | 2 |
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