Selective separation of vanadium from the high-acidity leaching liquor through chelating extraction by the ketoxime extractant

doi:10.1016/j.cjche.2025.05.028

中国化学工程学报 ›› 2025, Vol. 87 ›› Issue (11): 262-272.DOI: 10.1016/j.cjche.2025.05.028

Selective separation of vanadium from the high-acidity leaching liquor through chelating extraction by the ketoxime extractant

Xile Tian^1,2, Fancheng Meng^2,3, Xianglan Zhang¹, Yongchao Wang^2,3, Yahui Liu², Jian Zhang², Shuai Zhao^2,3, Desheng Chen^2,3, Lina Wang^2,3, Tao Qi²

1. School of Chemical & Environmental Engineering, China University of Mining and Technology, Beijing 100083, China;
2. National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
3. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 101408, China

收稿日期:2025-02-01 修回日期:2025-05-07 接受日期:2025-05-08 出版日期:2025-11-28 发布日期:2025-07-09
通讯作者: Fancheng Meng,E-mail:fcmeng@ipe.ac.cn;Lina Wang,E-mail:linawang@ipe.ac.cn
基金资助:
The authors gratefully acknowledge the financial support from Deep Earth Probe and Mineral Resources Exploration – National Science and Technology Major Project, China (2024ZD1003408) and Strategic Priority Research Program of the Chinese Academy of Sciences, China (XDA0430103).

Selective separation of vanadium from the high-acidity leaching liquor through chelating extraction by the ketoxime extractant

Xile Tian^1,2, Fancheng Meng^2,3, Xianglan Zhang¹, Yongchao Wang^2,3, Yahui Liu², Jian Zhang², Shuai Zhao^2,3, Desheng Chen^2,3, Lina Wang^2,3, Tao Qi²

1. School of Chemical & Environmental Engineering, China University of Mining and Technology, Beijing 100083, China;
2. National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
3. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 101408, China

Received:2025-02-01 Revised:2025-05-07 Accepted:2025-05-08 Online:2025-11-28 Published:2025-07-09
Contact: Fancheng Meng,E-mail:fcmeng@ipe.ac.cn;Lina Wang,E-mail:linawang@ipe.ac.cn
Supported by:
The authors gratefully acknowledge the financial support from Deep Earth Probe and Mineral Resources Exploration – National Science and Technology Major Project, China (2024ZD1003408) and Strategic Priority Research Program of the Chinese Academy of Sciences, China (XDA0430103).

摘要/Abstract

摘要： The high-acidity vanadium-containing solution contains high concentrations of iron and aluminum with pH around 0.5, the ketoxime extractant with the active ingredient of 2-hydroxy-5-nonylacetophenone oxime (HNAO, HL) was proposed to extract vanadium from the solution. Under the phase ratio (O/A) of 1:2, HNAO concentration of 0.542 mol·L^-1 at 25 °C for 10 min, 99.06% of vanadium was extracted after a three-stage countercurrent extraction, while the extraction of impurities was less than 1%, with the separation coefficients of vanadium from iron and aluminum were 137050 and 43197, respectively. The antioxidant properties of the extractant were studied. At 25 °C, the extractant basically did not undergo oxidative degradation. Besides, about 91.2% of the loaded vanadium was effectively stripped using 2.5 mol·L^-1 Na₂CO₃ solution. The extraction mechanism of vanadium was investigated through the slope analysis method, the spectral characterizations and density functional theory calculations. It has been observed that VO₂⁺ substitutes the H atom on the phenolic hydroxyl and coordinates with the N atom on the oxime and the O atom on the phenolic hydroxyl to form of a six-membered ring, and the extraction complexes were determined to be VO₂(H₂O)L and VO₂L.

关键词: Vanadium, Solvent extraction, High acidity, Ketoxime extractant, Chelating

Abstract: The high-acidity vanadium-containing solution contains high concentrations of iron and aluminum with pH around 0.5, the ketoxime extractant with the active ingredient of 2-hydroxy-5-nonylacetophenone oxime (HNAO, HL) was proposed to extract vanadium from the solution. Under the phase ratio (O/A) of 1:2, HNAO concentration of 0.542 mol·L^-1 at 25 °C for 10 min, 99.06% of vanadium was extracted after a three-stage countercurrent extraction, while the extraction of impurities was less than 1%, with the separation coefficients of vanadium from iron and aluminum were 137050 and 43197, respectively. The antioxidant properties of the extractant were studied. At 25 °C, the extractant basically did not undergo oxidative degradation. Besides, about 91.2% of the loaded vanadium was effectively stripped using 2.5 mol·L^-1 Na₂CO₃ solution. The extraction mechanism of vanadium was investigated through the slope analysis method, the spectral characterizations and density functional theory calculations. It has been observed that VO₂⁺ substitutes the H atom on the phenolic hydroxyl and coordinates with the N atom on the oxime and the O atom on the phenolic hydroxyl to form of a six-membered ring, and the extraction complexes were determined to be VO₂(H₂O)L and VO₂L.

Key words: Vanadium, Solvent extraction, High acidity, Ketoxime extractant, Chelating

Xile Tian, Fancheng Meng, Xianglan Zhang, Yongchao Wang, Yahui Liu, Jian Zhang, Shuai Zhao, Desheng Chen, Lina Wang, Tao Qi. Selective separation of vanadium from the high-acidity leaching liquor through chelating extraction by the ketoxime extractant[J]. 中国化学工程学报, 2025, 87(11): 262-272.

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Selective separation of vanadium from the high-acidity leaching liquor through chelating extraction by the ketoxime extractant

Selective separation of vanadium from the high-acidity leaching liquor through chelating extraction by the ketoxime extractant

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