熔盐萃取法深度除去金属锂中钠和钾的热力学分析

Thermodynamic Analysis of Effective Na/K Removal from Metallic Lithium by Molten Salt Extraction

针对传统锂工业中很难得到低钠和钾的金属锂,首次提出了溶盐萃取法,并进行了萃取过程的热力学分析和探索性实验研究.热力学计算结果表明,在923 K的萃取温度下,钾不仅能够直接与LiCl进行反应,而且还能与Li2Cl进行反应,而钠只能与Li2Cl进行反应,因此利用高纯氯化锂萃取金属锂中的钠和钾是可行的.探索性实验结果表明,熔盐萃取法可除去金属锂中的钠和钾,尤其是除钾效果比较明显,这与热力学分析结果基本吻合.

It is conventionally difficult to obtain metallic lithium with ultra low Na/K content,to which the molten salt extraction is therefore suggested as a pioneer process to remove Na/K and relevant experiments.The thermodynamic analysis showed that K can react with both LiCl and Li_2Cl,but Na can only react wth Li_2Cl,when using high-purity LiCl as extractant at 923?K.So,removing Na/K from Li by molten salt extraction process is theoretically feasible.Furthermore,the experimental results also revealed that the ...