Li Kangli, Lu Xiaolei, Jiang Congcong, Wang Dan, Zhu Jiang, Xu Meiling, Zhang Lina, Cheng Xin
Shandong Provincial Key Laboratory of Green and Intelligent Building Materials, University of Jinan, Jinan 250022, China.
School of Materials Science and Engineering, University of Jinan, Jinan 250022, China.
Toxics. 2025 Mar 14;13(3):211. doi: 10.3390/toxics13030211.
The rapid growth of aluminum and graphite industries has generated substantial stockpiles of red mud and graphite tailings, which pose environmental risks due to their high heavy metal content and potential for soil and water contamination. This study investigated the leaching behavior of heavy metals from these materials post-stabilization using cement and a sulfonated oil-based ion curing agent, thereby evaluating their suitability for safe reuse. Semi-dynamic leaching experiments were employed to measure heavy metal release, supplemented by kinetic modeling to discern key leaching mechanisms. The findings indicated that the heavy metal concentrations in leachates were consistently below regulatory standards, with leaching dynamics influenced by dual mechanisms: the diffusion of ions and surface chemical reactions. A diffusion coefficient-based analysis further suggested low leachability indices for all metals, confirming effective immobilization. These results suggest that cement and curing agent-stabilized red mud-graphite tailing composites reduce environmental risks and possess characteristics favorable for resource recovery, thus supporting their sustainable use in industrial applications.
铝和石墨行业的快速发展产生了大量的赤泥和石墨尾矿库存，由于其重金属含量高以及存在土壤和水污染的可能性，这些库存带来了环境风险。本研究调查了使用水泥和磺化油基离子固化剂对这些材料进行稳定化处理后重金属的浸出行为，从而评估它们安全再利用的适用性。采用半动态浸出实验来测量重金属的释放，并辅以动力学建模以识别关键的浸出机制。研究结果表明，浸出液中的重金属浓度始终低于监管标准，浸出动力学受两种机制影响：离子扩散和表面化学反应。基于扩散系数的分析进一步表明所有金属的浸出性指数较低，证实了有效的固定化。这些结果表明，水泥和固化剂稳定化的赤泥 - 石墨尾矿复合材料降低了环境风险，并具有有利于资源回收的特性，从而支持它们在工业应用中的可持续利用。
