电解锰渣中氨氮的草酸浸取工艺及机理研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (2): 715-724.

电解锰渣中氨氮的草酸浸取工艺及机理研究

刘士朋^1,2, 张欢欢^1,2, 程金科^1,2

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:2021-11-03 修回日期:2021-12-03 出版日期:2022-02-15 发布日期:2022-03-01
通讯作者: 程金科,博士,副教授。E-mail: 36273332@qq.com
作者简介:刘士朋(1996—),男,硕士研究生。主要从事固体废弃物资源化利用方向的研究。E-mail:1970579745@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)

Technology and Mechanism of Leaching Ammonia Nitrogen from Electrolytic Manganese Residue with Oxalic Acid

LIU Shipeng^1,2, ZHANG Huanhuan^1,2, CHENG Jinke^1,2

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:2021-11-03 Revised:2021-12-03 Online:2022-02-15 Published:2022-03-01

摘要/Abstract

摘要： 电解锰渣中氨氮是限制其综合利用的主要因素,草酸浸取可高效脱除电解锰渣中氨氮。本文研究影响电解锰渣氨氮浸出的工艺条件,通过FT-IR、XRD、XPS、SEM和EDS等技术表征物质变化,通过动力学分析和热力学计算建立氨氮浸出模型、探讨浸出机理。结果表明:用浸取-洗渣二级洗涤工艺,在液固比为2、草酸用量为10%、浸取时间为20 min时,氨氮剩余浓度13.85 mg/L,除氨率达98%。电解锰渣磷酸铵盐主要存在于难溶的硫酸钙晶格中,草酸促进硫酸钙晶格间磷酸铵盐的释放。氨氮浸出速率受化学反应和界面传质混合控制,铵根离子与草酸分子1∶1配位时释放能量最多,结构最稳定。

关键词: 电解锰渣, 氨氮, 草酸, 洗涤工艺, 浸取助剂, 浸出机理

Abstract: Ammonia nitrogen in electrolytic manganese residue (EMR) is the main factor limiting its comprehensive utilization, and oxalic acid leaching technological can effectively remove ammonia nitrogen from EMR. In this paper, the technological conditions affecting the leaching of ammonia nitrogen from electrolytic manganese residue were studied. The material changes were characterized by FT-IR, XRD, XPS, SEM and EDS. The leaching model of ammonia nitrogen was established by kinetic analysis and thermodynamic calculation, and the leaching mechanism was discussed. The results show that when the liquid to solid ratio is 2, the amount of oxalic acid is 10% and the leaching time is 20 min, the residual concentration of ammonia nitrogen is 13.85 mg/L and the ammonia removal rate is 98%. Ammonium phosphate in electrolytic manganese residue mainly exists in the crystal lattice of insoluble calcium sulfate, oxalic acid facilitate the release of ammonium phosphate from the calcium sulfate interlattice. The leaching rate of ammonia nitrogen is controlled by chemical reaction and interfacial mass transfer mixing, and the energy release is the most and the structure is the most stable when ammonium ion and oxalic acid are coordinated 1∶1.

Key words: electrolytic manganese residue, ammonia nitrogen, oxalic acid, washing process, leaching additive, leaching mechanism

中图分类号:

X781.1

刘士朋, 张欢欢, 程金科. 电解锰渣中氨氮的草酸浸取工艺及机理研究[J]. 硅酸盐通报, 2022, 41(2): 715-724.

LIU Shipeng, ZHANG Huanhuan, CHENG Jinke. Technology and Mechanism of Leaching Ammonia Nitrogen from Electrolytic Manganese Residue with Oxalic Acid[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 715-724.

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