High-efficiency leaching of electrolytic manganese residues in sulfuric acid-galena system

被引：0
作者：
Sun J. [1 ,2 ]
Rao S. [2 ,3 ,4 ,5 ]
Wang D. [2 ,3 ,4 ,5 ]
Yuan X. [2 ,3 ,4 ,5 ]
Cao H. [2 ,3 ,4 ,5 ]
Zhang H. [1 ]
Duan L. [2 ,3 ,4 ,5 ]
Liu Z. [2 ,3 ,4 ,5 ]
机构：
[1] Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming
[2] Guangdong Research Institute of Rare Metals, Guangzhou
[3] Guangdong Province Key Laboratory of Rare Earth Development and Application, Guangzhou
[4] State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou
[5] Guangdong Provincial Nonferrous Metal Scrap Resource Utilization and Harmless Disposal Engineering Technology Research Center, Guangzhou
来源：
Zhang, Haodong (haodong_zhang1971@163.com) | 2021年 / Central South University of Technology卷 / 52期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Electrolytic manganese residues; Galena; Kinetics; Leaching manganese; Manganese dioxide;
D O I：
10.11817/j.issn.1672-7207.2021.11.003
中图分类号：
学科分类号：
摘要：
In order to solve the difficulty of leaching high-valence manganese from electrolytic manganese residues(EMRs) with complex manganese composition, a process for efficiently selective leaching manganese in the sulfuric acid-galena system was proposed. Firstly, characterization methods such as X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscope-energy spectrometer(SEM-EDS) and inductively coupled plasma emission spectrometer(ICP) were employed. The element composition and phase composition of EMRs were studied. Secondly, the effects of galena addition, liquid-solid ratio, sulfuric acid concentration, leaching temperature and leaching time on leaching manganese and enriching lead were explored. Finally, kinetic experiment of manganese leaching in sulfuric acid-galena system was used to study the steps of reaction rate. The results show that valence of manganese in the EMRs is divalent and tetravalent, and the phases are manganese oxide, manganese sulfate and manganese dioxide. The sulfuric acid concentration has significant effect on the manganese leaching rate. The increase of sulfuric acid concentration can improve the oxidation of manganese dioxide, and so manganese is easier to leaching. The optimal process parameters are as follows: the mass ratio of EMRs to galena is 10꞉1, the sulfuric acid concentration is 1.5 mol/L, the liquid-solid ratio is 7.5 mL/g, the leaching temperature is 100 ℃, and the leaching time is 120 min. Under the optimum conditions, the manganese leaching rate is 98.02%, the manganese mass fraction in the leaching residue is less than 0.2%, and the lead mass fraction is higher than 60%. The leaching process of manganese is controlled by the interface chemical reaction, and the activation energy is 37.396 kJ/mol. The solid product layers of lead sulfate and sulfur generated during the leaching process have loose structure, which has little effect on the leaching rate. © 2021, Central South University Press. All right reserved.
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页码：3800 / 3812
页数：12
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