Synergistic leaching of lithium from clay-type lithium ore using sulfuric acid and oxalic acid

被引：0
|
作者：
Wang, Fengyuan [1 ]
Yang, Min [1 ]
Yang, Yuchun [1 ]
Tian, Yanling [1 ]
机构：
[1] School of Chemistry and Chemical Engineering Guizhou University, Guiyang,550025, China
来源：
Applied Clay Science | 2024年 / 262卷
关键词：
With the escalating market demand for lithium; the development and efficient utilization of lithium resources have become crucial. This study introduced a method for leaching lithium from raw clay-type lithium ores using a composite sulfuric acid oxalic acid system. The experimental results revealed that the optimal conditions for the leaching process included roasting temperature of 600 °C; sulfuric acid concentration of 0.8 mol/L; liquid-solid ratio of 5 mL/g; leaching temperature of 90 °C; leaching duration of 90 min; and oxalic acid dosage of 2 g. Under these conditions; the leaching efficiency of lithium reached 93.45 %. The structural changes during the lithium leaching process and leaching mechanism were analyzed by XRD; SEM; TOF-SIMS. It was found that the minerals after mixed-acid leaching showed a loose morphology; a decrease in the average particle size; and a significant increase in the specific surface area as well as the pore volume; leading to improved lithium leaching efficiency. Furthermore; the mechanism underlying the mixed-acid leaching of lithium from clay-type lithium ores was explored. According to this mechanism; sulfuric acid first dissociated H+; which disrupted the mineral structure; allowing further destruction by oxalic acid. During this process; Li+ was continuously replaced by H+ and reacted with C2O42− dissociated from oxalic acid to form water-soluble Li2C2O4. © 2024 Elsevier B.V;
D O I：
10.1016/j.clay.2024.107623
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