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硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (7): 2313-2319.

• 资源综合利用 • 上一篇    下一篇

电解锰渣中Mn2+的固化及动力学研究

冯圣霞, 杨敏, 张煜, 段江飞, 贺维龙, 李瑞   

  1. 贵州大学化学与化工学院,贵阳 550025
  • 收稿日期:2021-04-08 修回日期:2021-05-11 出版日期:2021-07-15 发布日期:2021-08-04
  • 通讯作者: 杨 敏,博士,副教授。E-mail:303225874@qq.com
  • 作者简介:冯圣霞(1995—),女,硕士研究生。主要从事固体废弃物的资源化利用方向的研究。E-mail:1506227955@qq.com
  • 基金资助:
    国家重点研发计划(2018YFC1903503)

Immobilization and Kinetics of Mn2+ in Electrolytic Manganese Residue

FENG Shengxia, YANG Min, ZHANG Yu, DUAN Jiangfei, HE Weilong, LI Rui   

  1. College of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
  • Received:2021-04-08 Revised:2021-05-11 Online:2021-07-15 Published:2021-08-04

摘要: 电解锰渣(EMR)中大量可溶性锰会带来严重的环境问题,需要对其进行固化处理。本文利用CaO固化电解锰渣中Mn2+及其动力学机制,系统考察了CaO添加量、液固比、温度和反应时间对Mn2+固化率的影响。通过XRD、SEM-EDS对原EMR和预处理EMR的物相组成、表面形貌检测分析,探讨固化反应机理。结果表明,在CaO与EMR质量比6:100、液固比4:1、温度55 ℃、反应时间150 min条件下,Mn2+固化率为99.72%。机理研究表明,电解锰渣中Mn2+以MnO2和MnOOH的形式固化。动力学分析结果表明,氧化钙固化Mn2+过程受化学反应和残留固体膜层扩散混合控制,反应表观活化能为11.713 5 kJ/mol。本研究提供了一种简单有效的改性锰渣方法,可用于指导锰渣可持续利用。

关键词: 电解锰渣, 氧化钙, 固化, 动力学, 活化能, 收缩未反应核模型

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

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