Effects of pH and salinity on the separation of magnesium and lithium from brine by nanofiltration

doi:10.5004/dwt.2017.21606

ISL OpenIR > 青海盐湖研究所知识仓储

	Effects of pH and salinity on the separation of magnesium and lithium from brine by nanofiltration
	Li, Yan; Zhao, Youjing; Wang, Min
第一作者	Li, Yan
	2017-11
发表期刊	DESALINATION AND WATER TREATMENT
ISSN	1944-3994
卷号	97 页码:141-150
关键词	Nanofiltration Separation Of mg2+/li+ Salinity Ph
摘要	It is difficult to extract lithium because of the high ratio of Mg2+ and Li+ in most salt lake brines in China. Therefore, the separation process of high Mg2+/Li+ ratio salt lake brine by a negatively charged DK nanofiltration membrane was investigated. The stability of the nanofiltration membrane, the concentration polarization phenomenon, and the surface charge of the nanofiltration membrane was first explored. The ability of the membrane to separate Mg2+ and Li+ at different salinities and pHs was further evaluated. The results indicate that due to the viscosity variation of the solution and the concentration polarization phenomenon, the membrane flux decreases with rising salinity. The Donnan exclusion, dielectric exclusion, and steric hindrance were studied to characterize the ionic fractionations of the nanofiltration membrane. When the salinity was 35 g/L, the Mg2+/Li+ reduced to 1.49. The membrane flux remained constant at different pHs, and the retention factor of Mg2+ was always higher than that of Li+. It remained at a relatively high level because of the electrostatic interaction between the cations and the negative charge on the functional groups on the membrane surface. The difference of the cation characters makes the retention factor of Mg2+ higher. The separation effect was relatively better under lower pH conditions.
DOI	10.5004/dwt.2017.21606
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6376
专题	青海盐湖研究所知识仓储盐湖资源与化学实验室
推荐引用方式 GB/T 7714	Li, Yan,Zhao, Youjing,Wang, Min. Effects of pH and salinity on the separation of magnesium and lithium from brine by nanofiltration[J]. DESALINATION AND WATER TREATMENT,2017,97:141-150.
APA	Li, Yan,Zhao, Youjing,&Wang, Min.(2017).Effects of pH and salinity on the separation of magnesium and lithium from brine by nanofiltration.DESALINATION AND WATER TREATMENT,97,141-150.
MLA	Li, Yan,et al."Effects of pH and salinity on the separation of magnesium and lithium from brine by nanofiltration".DESALINATION AND WATER TREATMENT 97(2017):141-150.