MnO2 reduction by calcium lignosulfonate: the kinetics and mechanism studies |
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| Authors: | Fangfang Wu Jie Deng Jiaqi Kuang Zhu Xiao Hui Liu Min Liang |
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| Affiliation: | 1. College of Science, Hunan Agricultural University, Changsha, People’s Republic of China!["ORCID]("//:0" "\"ORCID") https://orcid.org/0000-0003-4193-4187;2. College of Science, Hunan Agricultural University, Changsha, People’s Republic of China |
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| Abstract: | ABSTRACTThe 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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| Keywords: | Manganese dioxide ore calcium lignosulfonate reductive process mechanism kinetic model internal diffusion leaching sulphuric acid adsorption |
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!["ORCID]({"type":"image","src":"/templates/jsp/images/orcid.png"} "\"ORCID")
https://orcid.org/0000-0003-4193-4187;2. College of Science, Hunan Agricultural University, Changsha, People’s Republic of China