Resources Recovery Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahak-ro, Yuseong-gu, Daejeon 34132, Republic of Korea; Department of Resources Recycling, University of Science and Technology (UST), 217, Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea.
Resources Recovery Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahak-ro, Yuseong-gu, Daejeon 34132, Republic of Korea.
J Environ Sci (China). 2021 Sep;107:98-110. doi: 10.1016/j.jes.2021.02.001. Epub 2021 Feb 13.
The behavior and mechanism of Li leaching from lithium aluminum silicate glass-ceramics which can be used as a secondary source of Li using aqueous NaOH solution was investigated. The Li leaching efficiency is increased with increasing concentration of NaOH, specific surface area, and reaction temperature. When leached under optimum conditions, 2 mol/L NaOH, 53 μm particle undersize, 1:10 solid/liquid ratio, 250 r/min stirring speed, 100°C reaction temperature, 12 hr, the Li leaching efficiency was approximately 70%. However, when the leaching experiment was performed for 48 hr, the concentration of Li ions contained in the leach liquor decreased from 1160 to 236 mg/L. To investigate the origin of this phenomenon, the obtained leach residue was analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. These analyses show that zeolite was formed around the lithium aluminum silicate glass-ceramics, which affected the leaching of by adsorbing Li ions. In addition, using the shrinking-core model and the Arrhenius equation, the leaching reaction with NaOH was found to depends on the chemical reaction of the two reactants, with a higher than 41.84 kJ/mol of the activation energy.
采用水合氢氧化钠溶液研究了可作为锂二次资源的锂铝硅玻璃陶瓷的浸取行为和机制。随着氢氧化钠浓度、比表面积和反应温度的增加，锂浸出率增加。在最佳条件下浸出（2 mol/L NaOH、53 μm 粒径以下、固液比 1:10、搅拌速度 250 r/min、反应温度 100°C、12 小时），锂浸出率约为 70%。然而，当浸出实验进行 48 小时时，浸出液中锂离子的浓度从 1160 降低到 236 mg/L。为了研究这种现象的原因，对所得浸出残渣进行了 X 射线衍射、扫描电子显微镜和能谱分析。这些分析表明，沸石在锂铝硅玻璃陶瓷周围形成，通过吸附锂离子影响了锂的浸出。此外，利用收缩核模型和阿仑尼乌斯方程，发现与 NaOH 的浸出反应取决于两种反应物的化学反应，其活化能高于 41.84 kJ/mol。
