Removal of calcium and magnesium from lithium concentrated solution by solvent extraction method using D2EHPA

被引：67

作者：

Shi, Dong ^{[1
,2
,3
]}

Cui, Bin ^{[1
]}

Li, Lijuan ^{[2
,3
]}

Xu, Min ^{[2
,3
]}

Zhang, Yuze ^{[2
,3
]}

Peng, Xiaowu ^{[2
,3
]}

Zhang, Licheng ^{[2
,3
]}

Song, Fugen ^{[2
,3
]}

Ji, Lianmin ^{[2
,3
]}

机构：

[1] Northwest Univ, Key Lab Synthet & Nat Funct Mol, Shaanxi Key Lab Physicoinorgan Chem, Minist Educ,Coll Chem & Mat Sci, Xian 710127, Shaanxi, Peoples R China

[2] Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sa, Xining 810008, Qinghai, Peoples R China

[3] Qinghai Engn & Technol Res Ctr Comprehens Utiliza, Xining 810008, Qinghai, Peoples R China

来源：

DESALINATION | 2020年 / 479卷

基金：

中国国家自然科学基金;

关键词：

Solvent extraction; Lithium concentrated solution; Purification; Centrifugal extractor; SALT LAKE BRINE; GEOTHERMAL WATER; ENERGY-STORAGE; RECOVERY; SEPARATION; CHLORIDE; OPTIMIZATION; SYSTEM; IONS; ACID;

D O I：

10.1016/j.desal.2019.114306

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In this work, a solvent extraction process for Ca2+ and Mg2+ removal from Li+ concentrated solution consisted of 30 g/L Li+, 1.5 g/L Ca2+ and 1.5 g/L Mg2+ was proposed, using di-(2-ethylhexyl) phosphoric acid (D2EHPA) as extractant. The extraction process was a cation exchange mechanism, and the extraction sequence was Ca2+ > Mg2+ > Li+ > Nat Under the optimum condition of 66% saponification degree, 3/2 phase ratio and three-stage extraction, the extraction efficiency of Ca2+, Mg2+ and Li+ reached 99.00%, 98.57% and 15.28%, respectively. The extracted cations could be completely stripped by HCl solution, and the co-extracted Li+ could be selectively stripped and separated from Ca2+ and Mg2+ using higher concentration HCl solution at higher phase ratio. A whole removal process for Ca2+ and Mg2+ involving extraction, scrubbing, stripping and saponification sections was put forward, and the process stability was continuously tested on centrifugal extractors. Removal efficiency of Ca2+ and Mg2+ reached 99.05% and 98.48% respectively. Meanwhile, the loss ratio of Li+ was as low as 5.22%.

引用

页数：12

共 46 条

[1]

[Anonymous], [No title captured]

[2]

[Anonymous], [No title captured]

[3]

[Anonymous], [No title captured]

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[Anonymous], [No title captured]

[5] Hydration characteristics of Ca2+ and Mg2+: a density functional theory, polarized continuum model and molecular dynamics investigation [J].