Lithium carbonate recovery from lithium-containing solution by ultrasound assisted precipitation
Lithium carbonate recovery from lithium-containing solution by ultrasound assisted precipitation
复制标题
超声波辅助沉淀从含锂溶液中回收碳酸锂
DOI：
10.1016/j.ultsonch.2018.12.025
复制
发表时间：
2019
影响因子：
8.4
通讯作者：
Sun Zhi
中科院分区：
文献类型：
--
作者：
Zhao Chunlong;Zhang Yanling;Cao Hongbin;Zheng Xiaohong;Van Gerven Tom;Hu Yingyan;Sun Zhi
碳酸锂（Li2CO3）是最重要的锂化合物之一，通常由含锂溶液制备。锂的回收率和li2co3的纯度与锂的浓度密切相关。为了获得较高的锂回收率，需要高浓度的含锂溶液，而li2co3的纯度可以很低，同时保留大量的杂质。通常，单步沉淀法无法获得高纯度的li2co3，且锂回收率相对较高，特别是在低浓度含锂溶液中。本研究采用超声波技术提高锂回收率，制备工业级Li2CO3。研究发现，超声波可以显著降低li2co3晶体颗粒的聚合，促进杂质离子的解离。同时，超声波由于空化作用，加速了li2co3的成核过程，提高了锂的回收率。系统地讨论了li2co3沉淀过程中不同参数的影响。在优化条件下，锂回收率可提高12%，整体锂回收率为97.4%。一步沉淀法可得到纯度高于工业级的li2co3。这为从低浓度含锂溶液中有效回收锂和制备工业级Li2CO3提供了一条潜在途径。
Lithium carbonate (Li2CO3), one of the most important lithium compounds, is usually prepared from lithium-containing solution. The lithium recovery rate and the purity of Li2CO3are highly dependent on the lithium concentration. In order to get a high lithium recovery rate, high concentrated lithium-containing solution is required, while the purity of Li2CO3can be low remaining a significant amount of impurities. Usually, it is not possible to obtain high purity Li2CO3by single-step precipitation with a relatively high lithium recovery rate especially from a low concentrated lithium-containing solution. In this research, ultrasound is introduced to increase lithium recovery rate and prepare industrial grade Li2CO3. The research found that ultrasound can significantly reduce the polymerization of Li2CO3crystal particles and promote dissociation of impurity ions. At the same time, ultrasound accelerates the nucleation process of Li2CO3and boosts lithium recovery rate because of cavitation. The different parameters during the Li2CO3precipitation process were systematically discussed. Under the optimized conditions, the lithium recovery rate can be increased by 12% with a global lithium recovery rate of 97.4%. Li2CO3with a purity higher than industrial grade can be obtained by one-step precipitation. It demonstrates a potential pathway for effective lithium recovery from low concentrated lithium-containing solution and preparation of industrial grade Li2CO3.