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Zhenghong Yang, Haiyun Gu, Sijia Liu, Kai Wu, Linglin Xu, and Lijie Guo, Insights into the dissolution kinetics of copper–nickel tailings for CO2 mineral sequestration, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-3081-7
Zhenghong Yang, Haiyun Gu, Sijia Liu, Kai Wu, Linglin Xu, and Lijie Guo, Insights into the dissolution kinetics of copper–nickel tailings for CO2 mineral sequestration, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-3081-7
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铜镍尾矿在二氧化碳矿物封存中的溶解动力学研究

摘要: 铜镍尾矿(CNTs)作为典型的大宗工业固废,含有超过80%(质量分数)的含镁硅酸盐矿物,在CO2矿物封存方面具有巨大潜力。然而,这些硅酸盐矿物在普通酸性条件下反应活性较低,导致CNTs直接碳化时CO₂封存速率慢、效率低。本研究通过HCl浸出法对CNTs进行活化预处理,系统探究了其在酸性溶液中的溶解动力学行为,并重点考察了反应时间、HCl浓度、固液比及反应温度等关键参数对CNTs中镁浸出率的调控规律。结果表明,当HCl浓度为2 M、固液比为50 g·L−1及温度为90°C时,CNTs中镁的最大浸出率可达83.88%,显著提升了后续矿化反应中镁离子的可利用性。此外,改进的缩核模型可准确描述该浸出过程,镁的溶解过程受化学反应与产物层扩散的混合控制机制主导,表观活化能为77.51 kJ·mol−1。本研究明确了镁浸出的动力学控制步骤,为铜镍尾矿活化过程的参数设计提供了理论依据,证明了CNTs通过酸浸活化实现高效CO2封存的可行性。

 

Insights into the dissolution kinetics of copper–nickel tailings for CO2 mineral sequestration

Abstract: Copper–nickel tailings (CNTs), consisting of more than 80wt% magnesium-bearing silicate minerals, show great potential for CO2 mineral sequestration. The dissolution kinetics of CNTs in HCl solution was investigated through a leaching experiment and kinetic modeling, and the effects of reaction time, HCl concentration, solid-to-liquid ratio, and reaction temperature on the leaching rate of magnesium were comprehensively studied. Results show that the suitable leaching conditions for magnesium in CNTs are 2 M HCl, a solid-to-liquid ratio of 50 g·L−1, and 90°C, at which the maximum leaching rate of magnesium is as high as 83.88%. A modified shrinking core model can well describe the leaching kinetics of magnesium. The dissolution of magnesium was dominated by a combination of chemical reaction and product layer diffusion, with a calculated apparent activation energy of 77.51 kJ·mol−1. This study demonstrates the feasibility of using CNTs as a media for CO2 mineral sequestration.

 

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