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Kinetic study of high-pressure acid leaching of Mg and Ni from serpentine

高压酸浸蛇纹石中镁和镍的动力学研究

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Abstract

Inner Mongolian serpentine ore was subjected to sulfuric acid leaching tests, and the effects of the leaching process parameters on the leaching efficiency of different metals were investigated. The leaching efficiency of Mg, Fe, Al, Ni, and Co reaches 93.98%, 60.09%, 82.08%, 90.58%, and 94.06%, respectively, under the leaching conditions of 5 mol/L H2SO4, liquid/solid ratio of 4 mL/g, and leaching temperature 100 °C. Hence, the valuable metals in serpentine were effectively recovered by sulfuric acid leaching. The leaching behaviors of Mg, Fe, and a small amount of Al were analyzed using X-ray diffraction. The results show that the unreacted Mg and Fe remained as MgFe2O4, and Al formed Al2Si2O5(OH)4 in the leaching residue. The kinetics of Mg and Ni in the leaching process was studied respectively. The leaching kinetics of Mg conformed to the shrinking core model with an activation energy of 16.95 kJ/mol, which was controlled by the combination of the diffusion and chemical reaction. The leaching kinetics of Ni accorded with the Avrami equation with an activation energy of 11.57 kJ/mol, which was controlled by diffusion. In the study, the valuable metal elements were extracted from serpentine minerals with high efficiency and low cost, which possessed important practical values.

摘要

本文对内蒙古蛇纹石矿石进行了硫酸浸出试验, 并研究了不同浸出工艺参数对金属浸出效率的 影响。在H2SO4浓度为5 mol/L, 液固比为4 mL/g, 浸出温度为100 °C 的条件下, Mg, Fe, Al, Ni, Co 的浸出率分别达到93.98%, 60.09%, 82.08%, 90.58%, 94.06%, 表明硫酸浸出能有效地从蛇纹石 中回收有价金属。利用X射线衍射分析了浸出后Mg, Fe 和少量Al 在浸出渣中的浸出行为, 未反应的 Mg和Fe 以MgFe2O4的形式存在于浸出渣中, 少量的Al 以Al2Si2O5(OH)4的形式存在于浸出渣中。在浸 出过程中分别对Mg和Ni 进行了动力学研究, 其中Mg的浸出符合缩核模型, 在浸出过程中受扩散与 化学反应的混合控制, 活化能为16.95 kJ/mol。Ni 的浸出符合Avrami 方程, 在浸出过程中受扩散控制, 活化能为11.57 kJ/mol。该研究以高效, 低成本的方法从蛇纹石矿物中提取有了价金属元素, 具有重要 的实用价值。

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Funding

Project(51574286) supported by the National Natural Science Foundation of China

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Ling-long Wu  (伍玲龙), Xi-yun Yang  (杨喜云), Hui Xu  (徐徽), Zhi-jie Zhong  (钟志杰) & Xiao-di Wang  (王小弟)

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  1. Ling-long Wu  (伍玲龙)
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  2. Xi-yun Yang  (杨喜云)
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Correspondence to Xi-yun Yang  (杨喜云).

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Contributors

The research object and proposal of this paper were jointly formulated by YANG Xi-yun and XU Hui. The experiment process and the initial draft of the manuscript were completed by WU Ling-long. ZHONG Zhi-jie and WANG Xiao-di provided assistance with experimental design and data analysis. All authors carefully studied reviewers’ comments and made suggestions for paper revisions.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Wu, Ll., Yang, Xy., Xu, H. et al. Kinetic study of high-pressure acid leaching of Mg and Ni from serpentine. J. Cent. South Univ. 29, 410–419 (2022). https://doi.org/10.1007/s11771-022-4912-1

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