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硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (6): 2071-2080.

所属专题: 资源综合利用

• 资源综合利用 • 上一篇    下一篇

电解锰渣中锰的柠檬酸浸出工艺及机理研究

张欢欢1,2, 方双明1,2, 付娟1,2, 程金科1,2   

  1. 1.贵州大学化学与化工学院,贵阳 550025;
    2.贵州省高性能砼材料及成型工程技术研究中心,龙里 561200
  • 收稿日期:2023-04-12 修订日期:2023-04-12 出版日期:2023-06-15 发布日期:2023-06-25
  • 通信作者: 程金科,博士,副教授。E-mail:36273332@qq.com
  • 作者简介:张欢欢(1996—),女,硕士研究生。主要从事固体废弃物资源化利用的研究。E-mail:2252467842@qq.com
  • 基金资助:
    国家重点研发计划(2018YFC1903503);贵州省科技厅工程技术研究中心项目(黔科合平台-JXCX[2021]002);贵州省科技支撑计划(黔科合支撑[2021]一般331)

Leaching Process and Mechanism of Manganese from Electrolytic Manganese Slag by Citric Acid

ZHANG Huanhuan1,2, FANG Shuangming1,2, FU Juan1,2, CHENG Jinke1,2   

  1. 1. College of Chemical Engineering, Guizhou University, Guiyang 550025, China;
    2. High Performance Concrete Materials and Forming Engineering Technology Research Center of Guizhou, Longli 561200, China
  • Received:2023-04-12 Revised:2023-04-12 Online:2023-06-15 Published:2023-06-25

摘要: 电解锰渣中锰浓度较高,不仅浪费锰资源,还会制约锰渣综合利用。以柠檬酸为助剂高效浸出锰渣中的锰可促进锰渣资源化利用和电解锰行业绿色低碳发展。本文研究浸出工艺参数对锰渣中锰浸出浓度的影响,通过物相、结构、价态、形貌和动力学分析建立锰浸出模型,探讨浸出机理。结果表明:当柠檬酸掺量25%(质量分数)、液固比5∶1、浸出时间30 min时,锰浸出效果较好,浸出率为93.6%。锰浸出动力学符合收缩核模型,受化学反应和固体膜层混合控制。柠檬酸将高价态锰还原为二价锰,二价锰与柠檬酸以1∶2配位形成螯合物,螯合方式为柠檬酸分子的羧基和羟基共同参与成键。

关键词: 电解锰渣, 柠檬酸, 锰浸出, 工艺参数, 浸出机理

Abstract: The concentration of manganese in electrolytic manganese slag is higher, which not only wastes manganese resources, but also will restrict the comprehensive utilization of manganese residue. The high efficiency leaching of manganese from manganese residue with citric acid as additive can promote the resource utilization of manganese residue and the green and low-carbon development of electrolytic manganese industry. The influence of leaching parameters on the manganese leaching concentration in manganese slag was studied. A manganese leaching model was established by analyzing the phase, structure, valence, morphology and kinetics, and the leaching mechanism was discussed. The results show that when the citric acid content is 25% (mass fraction), the liquid-solid ratio is 5∶1, and the leaching time is 30 min, the manganese leaching effect is better, and the leaching rate is 93.6%. The kinetics of manganese leaching is in accordance with the shrinking core model, which is controlled by the mixture of chemical reaction and solid film. The high valence manganese is reduced to the divalent manganese by citric acid, and then the divalent manganese and citric acid coordinate to form a chelate in the form of 1∶2, in which the carboxyl and hydroxyl groups of citric acid molecules jointly participate in bonding.

Key words: electrolytic manganese residue, citric acid, manganese leaching, process parameter, leaching mechanism

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