海水卤水提锂高效吸附剂的合成及应用研究

Synthesis and Application of Efficient Adsorbent for Lithium Extraction from Seawater and Brines

高效吸附剂的研究和开发是高镁锂比海水卤水中锂分离提取的关键,当前最具工业应用前景的吸附剂为锂锰氧化物离子筛。本研究探讨了各合成条件对锂锰氧化物离子筛吸附剂的结构及吸附性能的影响,合成出了适用于不同镁锂比及锂浓度海水卤水的高容量吸附剂,吸附容量最高可达41.02 mg/g,锰溶损率为3.06%;此外,还开展了锂吸附分离的动态模拟试验,为所合成吸附剂用于海水卤水提锂的应用研究奠定基础。

Research and development of efficient adsorbents are the key to lithium extraction from seawater and brines with high ratio of magnesium to lithium, and the most promising adsorbents for industrial application now are lithium manganese oxide ion-sieves. In this paper, the influences of synthetic conditions on the structures and adsorption properties of lithium manganese oxide ion-sieves were discussed, and the adsorbents which were verified to have high capacity could be applied to seawater and brines with different ratios of magnesium to lithium and different lithium concentrations. The highest adsorption capacity could achieve 41.02 mg/g,and its solution-loss rate of manganese was 3.06%. Furthermore, dynamic simulation experiments on lithium adsorption were carried out, which laid a foundation for the application research on lithium extraction from seawater and brines with adsorbents synthesized in this paper.