文献类型： 外文期刊
作者： Wu, Fangfang 1 ; Deng, Jie 1 ; Kuang, Jiaqi 1 ; Xiao, Zhu 1 ; Liu, Hui 1 ; Liang, Min 1 ; Yu, Peng 1 ; Mi, Baobin 2 ;
作者机构： 1.Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China
2.Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Peoples R China
关键词： Manganese dioxide ore; calcium lignosulfonate; reductive process mechanism; kinetic model; internal diffusion; leaching; sulphuric acid; adsorption
期刊名称：CANADIAN METALLURGICAL QUARTERLY （ 影响因子：1.212； 五年影响因子：1.248 ）
ISSN： 0008-4433
年卷期：
页码：
收录情况： SCI
摘要： The kinetics and mechanism of the reduction of manganese dioxide ore by calcium lignosulfonate (CLS) in acid solution were investigated. The results showed that the reducing process mainly occurred after the adsorption and then decomposition of CLS by ore and the concentration of sulphuric acid exerted an enhancing effect on both CLS adsorption and manganese extraction. The effects of leaching temperature, the mass ratio of CLS to MnO2 in ore, concentration of sulphuric acid as well as leaching time on per cent leached of Mn were also discussed. The experimental data were well interpreted with a shrinking core model of internal diffusion, and an overall kinetic model was established. The reaction rate constant was found to be proportional to the mass ratio of CLS to MnO2 in ore and concentration of sulphuric acid, and the apparent activation energy was determined to be 69.4 kJ mol(-1) by using Arrhenius expression.
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