Leaching process of spent cathode carbon from aluminum electrolysis industry with NaOH sub-molten salt and leaching kinetics of aluminum-containing solid phase

被引：0

作者：

Zhang, Junyu ^{[1
,2
]}

Hu, Xianwei ^{[1
,2
]}

Yan, Fengyun ^{[1
,2
]}

Tao, Wenju ^{[1
,2
]}

Shi, Zhongning ^{[1
,2
]}

Wang, Zhaowen ^{[1
,2
]}

机构：

[1] School of Metallurgy, Northeastern University, Shenyang

[2] Key Laboratory for Ecological Metallurgy of Multimetallic Minerals, Ministry of Education, Northeastern University, Shenyang

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2025年 / 35卷 / 06期

基金：

中国国家自然科学基金;

关键词：

aluminium electrolysis; carbon purity; leaching kinetics; NaOH sub-molten salt; spent cathode carbon;

D O I：

10.11817/j.ysxb.1004.0609.2025-45439

中图分类号：

学科分类号：

摘要：

In this study, the leaching process of spent cathode carbon(SCC) with NaOH sub-molten salt was studied, the reaction mechanism of the main components of SCC was explored and the leaching kinetics of aluminum-containing substances were analyzed. The results show that the optimal process conditions for leaching SCC with NaOH sub-molten salt are as follows: NaOH mass fraction of 50%, temperature of 215 ℃, reaction time of 225 min, stirring rate of 700 r/min and oxygen partial pressure of 1 MPa. Under these conditions, the carbon purity of the leached slag reaches 96.1%, and the Al leaching rate is 91.32%. Some Ca-containing phases in SCC generate Ca(OH)2 and NaCaHSiO4 in the sub-molten salt, which adhere to the surface of carbon particles and hinder the further dissolution of Al-containing and Ca-containing phases. The leaching process of Al-containing phase in SCC is controlled by internal diffusion, and the apparent activation energy is 16.77 kJ/mol. © 2025 Central South University. All rights reserved.

引用

页码：2182 / 2194

页数：12

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