Kinetic mechanism of copper extraction from methylchlorosilane slurry residue using hydrogen peroxide as oxidant

doi:10.1016/j.cjche.2023.02.007

Abstract

Abstract: Copper was extracted from methylchlorosilane slurry residue by a direct hydrogen peroxide leaching method. A number of experimental parameters were analyzed to determine the extraction efficiency of copper. The extraction efficiency of copper reached 98.5% under the optimal leaching conditions, such as the hydrogen peroxide concentration of 1.875 mol·L^-1, the leaching temperature of 323 K, the liquid-solid ratio of 20 ml·g^-1, and the stirring speed of 300 r?min^-1. The leaching kinetics of the copper extraction process was then described by the shrinking core model. There were two stages. The first stage was controlled by chemical reactions, while the second stage was controlled by interface transfer and product layer diffusion. The activation energy and kinetic control equations were determined, as well as an explanation of the leaching mechanism of copper extraction based on kinetic analysis and materials characterization. Copper resources can be recovered from the methylchlorosilane slurry residue efficiently and inexpensively with the methods used in this study.

Key words: Methylchlorosilane slurry residue, Copper extraction, Hydrogen peroxide, Kinetics

摘要： Copper was extracted from methylchlorosilane slurry residue by a direct hydrogen peroxide leaching method. A number of experimental parameters were analyzed to determine the extraction efficiency of copper. The extraction efficiency of copper reached 98.5% under the optimal leaching conditions, such as the hydrogen peroxide concentration of 1.875 mol·L^-1, the leaching temperature of 323 K, the liquid-solid ratio of 20 ml·g^-1, and the stirring speed of 300 r?min^-1. The leaching kinetics of the copper extraction process was then described by the shrinking core model. There were two stages. The first stage was controlled by chemical reactions, while the second stage was controlled by interface transfer and product layer diffusion. The activation energy and kinetic control equations were determined, as well as an explanation of the leaching mechanism of copper extraction based on kinetic analysis and materials characterization. Copper resources can be recovered from the methylchlorosilane slurry residue efficiently and inexpensively with the methods used in this study.

关键词: Methylchlorosilane slurry residue, Copper extraction, Hydrogen peroxide, Kinetics

Xiaolin Guo, Zhaoyang Zhang, Pengfei Xing, Shuai Wang, Yibing Guo, Yanxin Zhuang. Kinetic mechanism of copper extraction from methylchlorosilane slurry residue using hydrogen peroxide as oxidant[J]. Chinese Journal of Chemical Engineering, 2023, 60(8): 228-234.

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