title: Study on the recovery of lithium from high Mg(2+)/Li(+) ratio brine by nanofiltration.
abstract: An experiment to recover lithium from high Mg(2+)/Li(+) ratio brine by nanofiltration (NF) was carried out. The combination of Donnan exclusion, dielectric exclusion and steric hindrance governed the mass transport inside the NF membrane. Experimental results showed that NF is an efficient technique to recycle Li(+) and reduce Mg(2+)/Li(+) ratio from high Mg(2+)/Li(+) ratio brine. When content reached 6.0 g/L, operating pressure reached 0.8 MPa and Mg(2+)/Li(+) ratio in feed was 40, the rejection of magnesium (R(Mg(2+))) and the separation factor (SF) were 0.96 and 42, respectively. The Mg(2+)/Li(+) ratio in permeate could be reduced to 0.9, and Li(+) recovery ratio was 85%. Adding potassium (K(+)) or sodium (Na(+)) to solution can reduce R(Mg(2+)) and SF.
authors.affiliation: College of Chemical Engineering, Qinghai University, Xining 810016, China E-mail: bqy1110@163.com.
authors.forename: Qiuyan
authors.initials: Q
authors.lastname: Bi
authors.affiliation: College of Chemical Engineering, Qinghai University, Xining 810016, China E-mail: bqy1110@163.com.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: College of Chemical Engineering, Qinghai University, Xining 810016, China E-mail: bqy1110@163.com.
authors.forename: Chenying
authors.initials: C
authors.lastname: Zhao
authors.affiliation: College of Chemical Engineering, Qinghai University, Xining 810016, China E-mail: bqy1110@163.com.
authors.forename: Zhenqi
authors.initials: Z
authors.lastname: Tao
mesh_terms: D005374:Filtration / Q000379:methods*; D008094:Lithium / Q000737:chemistry*; D008274:Magnesium / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D011188:Potassium / Q000737:chemistry; D012492:Salts / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D012492:Salts; D014874:Water Pollutants, Chemical; C017082:brine; D008094:Lithium; D012964:Sodium; D008274:Magnesium; D011188:Potassium