Baffa Haruna, Zhongyan Luo, Mujtaba Aminu Muhammad, Jinfeng Tang, J. Kuva, R. Koivula, Hongli Bao, Junhua Xu
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引用次数: 0
摘要
本研究介绍了一种直接有效的非晶态 ZrP/ 聚丙烯腈复合离子交换方法,用于从废旧锂离子电池(NMC 111)浸出液中分离锂。通过一系列优化实验对正极材料进行了浸出。研究了 H2SO4 浓度、温度、H2O2 浓度和纸浆密度等操作变量对浸出效率的影响,以确定吸附实验的最佳条件。结果发现,锂、钴、镍和锰的浸出效率分别为 99.9%、99.5%、98.8% 和 99.9%。随后,利用 am-ZrP/PAN 进行了批量吸附实验,包括测定 pH 值的影响、吸附动力学和吸附等温线。在 Li、Ni、Mn 和 Co 的 1 mmol/L 等摩尔溶液中考察了 pH 对吸附的影响。在浸出液中,锂与锰、钴和镍分离。吸附剂对锰、钴和镍的吸附更符合假二阶动力学。即使在溶液浓度较高的 15 mM Li、Ni、Co 和 Mn 溶液中,也能观察到对 Li 的高选择性。此外,柱加载过程还显示出对 Li 的选择性优于对 Co、Ni 和 Mn 金属离子的选择性。利用质量流对整个过程进行的初步评估表明,在今后的研究中,通过整合综合湿法冶金方法实现完全分离和金属回收是可行的。然而,要开发出实用的分离流程图,仍有许多工作要做。
Selective Separation of Lithium from Leachate of Spent Lithium-Ion Batteries by Zirconium Phosphate/Polyacrylonitrile Composite: Leaching and Sorption Behavior
This study introduces a straightforward and effective amorphous ZrP/polyacrylonitrile composite ion exchange method for separating Li from the leachate of spent Li-ion batteries (NMC 111). The cathode materials were leached with a series of optimized experiments. The influence of operating variables, including the H2SO4 concentration, temperature, H2O2 concentration, and pulp density, on leaching efficiency was examined to determine the optimal conditions for sorption experiments. The leaching efficiencies of Li, Co, Ni, and Mn were found to be 99.9%, 99.5%, 98.8%, and 99.9%, respectively. Subsequently, batch sorption experiments were performed by using am-ZrP/PAN, including the determination of the effect of pH, sorption kinetics, and the sorption isotherm. The effect of pH on adsorption was examined in 1 mmol/L equimolar solutions of Li, Ni, Mn, and Co. Li was separated from Mn, Co, and Ni in the leaching liquor. The adsorbent for Mn, Co, and Ni sorption better fitted pseudo-second-order kinetics. High selectivity for Li was observed, even at the higher solution concentration of 15 mM Li, Ni, Co and Mn. In addition, the column loading process demonstrated selectivity for Li over Co, Ni, and Mn metal ions. The preliminary evaluation of the whole process with mass flow demonstrated that it would be feasible to achieve full separation and metal recovery by integrating a combined hydrometallurgical method in future studies. However, much work is still needed to develop a practical separation flowsheet.