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Process Optimization and Kinetics of Leaching Magnesium from Low-Grade Magnesite with Ammonium Bisulfate

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Abstract

This article mainly studies the process optimization and kinetics of leaching magnesium from low-grade magnesite in ammonium bisulfate (NH4HSO4) solution. The effects of leaching time, leaching temperature, ammonium bisulfate concentration and excess rate of ammonium bisulfate on the magnesium leaching rate were investigated, and the composition and microstructure of magnesite before and after leaching were analyzed. Through optimization based on the response surface method based on the center combination design, the optimal leaching conditions are determined as follows: the leaching time is 7.7 h, the leaching temperature is 94°C, the mass concentration of NH4HSO4 is 19.2%, and the excess rate of NH4HSO4 is 18.7%. Under the optimal conditions, the leaching rate of magnesium was 95.9%. Using a shrinking core model, dissolution curves were evaluated. The leaching kinetics of magnesite in ammonium bisulfate solution show that the leaching was controlled by a surface chemical reaction with an activation energy of 43.40 kJ/mol.

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Acknowledgements

This work is supported by the Liaoning Province Applied Basic Research Program Project 2023JH2/101300245, the National Natural Science Foundation of China (Grant no. 51974188) and the Liaoning Revitalization Talents Program (No. XLYC2008014).

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Authors and Affiliations

  1. School of Material Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China

    Wen Li, Laishi Li, Yusheng Wu, Yuzheng Wang & Mingchun Li

  2. School of Metallurgy, Northeastern University, Shenyang, 110167, China

    Zhiqiang Ning

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  1. Wen Li
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Correspondence to Laishi Li.

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Li, W., Li, L., Wu, Y. et al. Process Optimization and Kinetics of Leaching Magnesium from Low-Grade Magnesite with Ammonium Bisulfate. JOM 75, 4385–4396 (2023). https://doi.org/10.1007/s11837-023-06058-0

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