标题: Pure water leaching soluble manganese from electrolytic manganese residue: Leaching kinetics model analysis and characterization
作者: Zheng, F (Zheng, Fan); Zhu, H (Zhu, Hua); Luo, T (Luo, Teng); Wang, HJ (Wang, Haojie); Hou, HB (Hou, Haobo)
来源出版物: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 卷: 8 期: 4 文献号: 103916 DOI: 10.1016/j.jece.2020.103916 出版年: AUG 2020
摘要: Electrolytic manganese residue (EMR) is a solid waste that generated in electrolytic manganese metal production, which would not only contaminate the environment due it contains soluble manganese, but occupy a large amount of farmlands as well. Hence, recovering manganese from EMR using economical method is the key to achieve the targets of resource recycling and solid waste harmless treatment. In this paper, pure water was used to leach soluble manganese out from EMR. Leaching kinetics model of manganese were established and examined, characteristics of EMR before and after leaching were analyzed by XRF, XRD, EPMA-WDS and SEM. The results revealed that the apparent activated energy (E) during the leaching processes was 11.17 +/- 2.02 kJ/mol and the slope in fitting line of Arrhenius equation was -1.343, which indicated that the leaching kinetic model was appropriate and the rate determining step was diffusion process, that is, Mn2+ migrate into bulk solution from diffusion layer. The main crystal phases in EMR are quartz (SiO2) and calcium sulfate (CaSO4 center dot nH(2)O) (n = 0.5 or 2), but the distribution relationship between SiO2 and CaSO4 center dot nH(2)O was not regular. Mn is in the form of "film" covered in CaSO4 bar in EMR. High temperature and high volume of water could promote Mn2+ transport process. The optimal leaching condition was S:L (Solid : Liquid)1:4, temperature was 24 degrees C and the agitation rate was 300 r/min when combined the cost and efficiency, and 83.35 % soluble manganese can be leached out from EMR.
作者关键词: Electrolytic manganese residue (EMR); Pure water leaching; Leaching kinetics model; Recovery of manganese
KeyWords Plus: AMMONIA
地址: [Zheng, Fan; Zhu, Hua; Luo, Teng; Wang, Haojie; Hou, Haobo] Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.
通讯作者地址: Hou, HB (corresponding author)，Wuhan Univ, Fac Engn, Sch Mech & Power, RM 9207, Hongshan Dist, Hubei, Peoples R China.
Zhu, H (corresponding author)，Wuhan Univ, Fac Engn, Sch Mech & Power, RM 9615, Hongshan Dist, Hubei, Peoples R China.
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