Making waste profitable: Efficient recovery of metallic iron from jarosite residues

doi:10.1016/j.cjche.2024.04.004

Chinese Journal of Chemical Engineering ›› 2024, Vol. 71 ›› Issue (7): 66-76.DOI: 10.1016/j.cjche.2024.04.004

Making waste profitable: Efficient recovery of metallic iron from jarosite residues

Songshan Zhou¹, Yunhui Han¹, Rong Huang¹, Yin Huang¹, Qingyuan Dong¹, Haiyin Gang¹, Jinchuan Qin¹, Xi Yu¹, Xiangfei Zeng¹, Wenxing Cao¹, Jiqin Wang², Shaoqin Chen¹, Rong Wang³, Mengjun Chen¹

1. Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China;
2. School of Environment, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang 453007, China;
3. School of National Defense Science and Technology College SWUST, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China

Received:2023-10-28 Revised:2024-02-23 Online:2024-08-30 Published:2024-07-28
Contact: Mengjun Chen,E-mail:kyling@swust.edu.cn
Supported by:
The National Natural Science Foundation of China (22276153, 51974262) funded this work.

Making waste profitable: Efficient recovery of metallic iron from jarosite residues

1. Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China;
2. School of Environment, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang 453007, China;
3. School of National Defense Science and Technology College SWUST, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China

通讯作者: Mengjun Chen,E-mail:kyling@swust.edu.cn
基金资助:
The National Natural Science Foundation of China (22276153, 51974262) funded this work.

Abstract

Abstract: To address the hazardous by-product of zinc smelting and resource utilization of jarosite residue, this study applies an electric field-assisted hot acid treatment to completely recycle iron (Fe). This innovative approach aims to enhance the leaching efficiency of Fe from jarosite residue. The introduction of an electric field changes the charge distribution on the surface of the particles to enhance ions and electrons exchange and promotes the collision between particles to strengthen reaction kinetics. Based on the above, the leaching efficiency of Fe in jarosite under sulfuric acid attack has improved observably. The result shows that Fe leaching efficiency reaches 98.83%, which is increased by 28% under the optimal experimental conditions: current density of 30 mA·cm^-2, H₂SO₄ concentration of 1.5 mol·L^-1, solid-liquid ratio of 70 g·L^-1, temperature of 80 °C and time of 12 h. Leaching kinetics calculations show that the apparent activation energy is 16.97 kJ·mol^-1 and the leaching of jarosite residue is controlled by a mixture of chemical reaction and diffusion, as well as the temperature and concentration of the leaching solution have an influence on leaching. This work provides a feasible idea for the efficient leaching of Fe from jarosite residue.

Key words: Jarosite residue, Electric filed, Leaching kinetics

摘要： To address the hazardous by-product of zinc smelting and resource utilization of jarosite residue, this study applies an electric field-assisted hot acid treatment to completely recycle iron (Fe). This innovative approach aims to enhance the leaching efficiency of Fe from jarosite residue. The introduction of an electric field changes the charge distribution on the surface of the particles to enhance ions and electrons exchange and promotes the collision between particles to strengthen reaction kinetics. Based on the above, the leaching efficiency of Fe in jarosite under sulfuric acid attack has improved observably. The result shows that Fe leaching efficiency reaches 98.83%, which is increased by 28% under the optimal experimental conditions: current density of 30 mA·cm^-2, H₂SO₄ concentration of 1.5 mol·L^-1, solid-liquid ratio of 70 g·L^-1, temperature of 80 °C and time of 12 h. Leaching kinetics calculations show that the apparent activation energy is 16.97 kJ·mol^-1 and the leaching of jarosite residue is controlled by a mixture of chemical reaction and diffusion, as well as the temperature and concentration of the leaching solution have an influence on leaching. This work provides a feasible idea for the efficient leaching of Fe from jarosite residue.

关键词: Jarosite residue, Electric filed, Leaching kinetics

Songshan Zhou, Yunhui Han, Rong Huang, Yin Huang, Qingyuan Dong, Haiyin Gang, Jinchuan Qin, Xi Yu, Xiangfei Zeng, Wenxing Cao, Jiqin Wang, Shaoqin Chen, Rong Wang, Mengjun Chen. Making waste profitable: Efficient recovery of metallic iron from jarosite residues[J]. Chinese Journal of Chemical Engineering, 2024, 71(7): 66-76.

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Making waste profitable: Efficient recovery of metallic iron from jarosite residues

Making waste profitable: Efficient recovery of metallic iron from jarosite residues

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