Immobilization and Kinetics of Mn2+ in Electrolytic Manganese Residue

Abstract

Abstract: The soluble manganese in electrolytic manganese residue (EMR) leads to serious environmental problems, and it’s important to solidify the soluble manganese. In this article, the immobilization of Mn²⁺ in EMR curing by CaO and its kinetic mechanism were studied. The effects of the content of CaO, liquid-solid ratio, temperature and reaction time on the Mn²⁺precipitation efficiency were investigated systematically. The structure and morphology of raw EMR and treated EMR were characterized by XRD and SEM-EDS. The results show that with the CaO:EMR mass ratio of 6:100, liquid:solid ratio of 4:1, temperature of 55 ℃, and reacting time of 150 min, the Mn²⁺ precipitation efficiency is 99.72%. The mechanism demonstrated that Mn²⁺ is immobilized in the form of groutite (MnOOH) and ramsdellite (MnO₂). The results of kinetics show that it is controlled by the chemical reaction and diffusion mixing of the residual solid film, and the apparent activation energy of the reaction is 11.713 5 kJ/mol. This study provides a simple and effective method to modify manganese residue, which can be applied to guide the sustainable utilization of manganese residue.

Key words: electrolytic manganese residue, calcium oxide, immobilization, kinetics, activation energy, shrinkage unreacted nucleus model

CLC Number:

X753

FENG Shengxia, YANG Min, ZHANG Yu, DUAN Jiangfei, HE Weilong, LI Rui. Immobilization and Kinetics of Mn²⁺ in Electrolytic Manganese Residue[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2313-2319.

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Immobilization and Kinetics of Mn²⁺ in Electrolytic Manganese Residue

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