Highly efficient extraction of lithium from salt lake brine by LiAl-layered double hydroxides as lithium-ion-selective capturing material

• 作者: Shaofang Hu Xiaoyu Guo Xu Xiang Ying Sun
• 来源期刊: 能源化学
• 年，卷（期）: 2019,（7）
• 页码范围: 80-87
• 页数: 8页
• 语种: 英文

摘要

The extraction of lithium from salt lake brine in the Chinese Qaidam Basin is challenging due to its high Mg/Li and Na/Li ratios.Herein,we utilized a reaction-coupled separation technology to separate sodium and lithium ions from a high Na/Li ratio brine (Na/Li =48.7,w/w) and extracted lithium with LiAl-layered double hydroxides (LiAl-LDHs).The LiAl-LDHs act as lithium-ion-selective capturing materials from multication brines.That is,the lithium ions selectively enter the solid phase to form LiAl-LDHs,and the sodium ions are still retained in the liquid phase.This is because the lithium ions can be incorporated into the structural vacancies of LiAl-LDHs,whereas the sodium ions cannot.The effects of reaction conditions on lithium loss and separation efficiency were investigated at both the nucleation and the crystallization stage,e.g.,the nucleation rotating speed,the Li/Al molar ratio,the crystallization temperature and time,and co-existing cations.The lithium loss is as low as 3.93％ under optimal separation conditions.The sodium ions remained in the solution.Consequently,an excellent Na/Li separation efficiency was achieved by this reaction-coupled separation technology.These findings confirm that LiAl-LDHs play a critical function in selectively capturing lithium ions from brines with a high Na/Li ratio,which is useful for the extraction of lithium ions from the abundant salt lake brine resources in China.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	Ying Sun		1	0	0.0	0.0
2	Xiaoyu Guo		1	0	0.0	0.0
3	Shaofang Hu		1	0	0.0	0.0
4	Xu Xiang		1	0	0.0	0.0