Anodic process of stibnite in slurry electrolysis: The direct collision oxidation

doi:10.1016/j.cjche.2021.12.011

Chinese Journal of Chemical Engineering ›› 2022, Vol. 41 ›› Issue (1): 466-472.DOI: 10.1016/j.cjche.2021.12.011

Anodic process of stibnite in slurry electrolysis: The direct collision oxidation

Yonglu Zhang^1,2,3, Dingfan Qiu³, Chengyan Wang^1,2, Yongqiang Chen^1,2, Zhichao Yao³, Xiaowu Jie³, Wei Gao³, Shufeng Ruan³

1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3 BGRIMM Technology Group, Beijing 100160, China

Received:2021-06-17 Revised:2021-12-06 Online:2022-02-25 Published:2022-01-28
Contact: Chengyan Wang,E-mail address:chywang@yeah.net;Yongqiang Chen,E-mail address:chyq0707@sina.com
Supported by:
The authors gratefully acknowledge BGRIMM MTC Technology Co., Ltd. for their assistance with the chemical composition analysis. This work was supported by the National Key Research & Development Program of China (2019YFC1908404), the Major Science and Technology Projects of Qinghai Province (2018-GXA7), and the National Natural Science Foundation of China (51604030).

Anodic process of stibnite in slurry electrolysis: The direct collision oxidation

Yonglu Zhang^1,2,3, Dingfan Qiu³, Chengyan Wang^1,2, Yongqiang Chen^1,2, Zhichao Yao³, Xiaowu Jie³, Wei Gao³, Shufeng Ruan³

1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3 BGRIMM Technology Group, Beijing 100160, China

通讯作者: Chengyan Wang,E-mail address:chywang@yeah.net;Yongqiang Chen,E-mail address:chyq0707@sina.com
基金资助:
The authors gratefully acknowledge BGRIMM MTC Technology Co., Ltd. for their assistance with the chemical composition analysis. This work was supported by the National Key Research & Development Program of China (2019YFC1908404), the Major Science and Technology Projects of Qinghai Province (2018-GXA7), and the National Natural Science Foundation of China (51604030).

Abstract

Abstract: Mineral oxidation leaching in the anode area is the key step in slurry electrolysis. By adopting the slow linear potential scanning method during slurry electrolysis, this study investigated the steady-state polarization curve of a pure stibnite mineral on a graphite anode. In addition, the influence of the mineral particle size, liquid–solid ratio, stirring speed, and temperature on the collision oxidation of the mineral with the anode was studied. Based on the different oxidation reactions, the potential range can be divided into three intervals: the low-potential interval with a potential lower than 0.75 V, an intermediatepotential interval with a potential within 0.75–1.2 V, and a high-potential interval with a potential higher than 1.2 V. The collision oxidation of the mineral with the anode occurred in all three intervals. The oxidation of Sb(III) also appeared in the intermediate- and high-potential intervals, and chlorine evolution occurred in the high-potential interval. Therefore, the low-potential interval was determined to be a suitable potential interval for the slurry electrolysis process. In the low-potential interval, the particle size, liquid–solid ratio, and stirring speed had little effect on the oxidation rate of the minerals. As the temperature increased, the stibnite oxidation rate and exchange current density increased. Overall, the direct collision oxidation rate of stibnite was relatively low and the current densities under all the investigated conditions were lower than 0.4 mA·cm^-2. This indicates that it is difficult to realize industrial production while relying solely on this process.

Key words: Slurry electrolysis, Stibnite, Potential range, Potential interval, Steady-state polarization curve

摘要： Mineral oxidation leaching in the anode area is the key step in slurry electrolysis. By adopting the slow linear potential scanning method during slurry electrolysis, this study investigated the steady-state polarization curve of a pure stibnite mineral on a graphite anode. In addition, the influence of the mineral particle size, liquid–solid ratio, stirring speed, and temperature on the collision oxidation of the mineral with the anode was studied. Based on the different oxidation reactions, the potential range can be divided into three intervals: the low-potential interval with a potential lower than 0.75 V, an intermediatepotential interval with a potential within 0.75–1.2 V, and a high-potential interval with a potential higher than 1.2 V. The collision oxidation of the mineral with the anode occurred in all three intervals. The oxidation of Sb(III) also appeared in the intermediate- and high-potential intervals, and chlorine evolution occurred in the high-potential interval. Therefore, the low-potential interval was determined to be a suitable potential interval for the slurry electrolysis process. In the low-potential interval, the particle size, liquid–solid ratio, and stirring speed had little effect on the oxidation rate of the minerals. As the temperature increased, the stibnite oxidation rate and exchange current density increased. Overall, the direct collision oxidation rate of stibnite was relatively low and the current densities under all the investigated conditions were lower than 0.4 mA·cm^-2. This indicates that it is difficult to realize industrial production while relying solely on this process.

关键词: Slurry electrolysis, Stibnite, Potential range, Potential interval, Steady-state polarization curve

Yonglu Zhang, Dingfan Qiu, Chengyan Wang, Yongqiang Chen, Zhichao Yao, Xiaowu Jie, Wei Gao, Shufeng Ruan. Anodic process of stibnite in slurry electrolysis: The direct collision oxidation[J]. Chinese Journal of Chemical Engineering, 2022, 41(1): 466-472.

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Anodic process of stibnite in slurry electrolysis: The direct collision oxidation

Anodic process of stibnite in slurry electrolysis: The direct collision oxidation

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