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Materials 2019, 12, 1968 3 of 13 In this work, LiAl-LDHs were first synthesized from salt lake brine. The chemical composition of the brine is shown in Table 1. Subsequently, Li+ ions were recovered from the pre-synthesized LiAl-LDHs into an aqueous solution by mild chemical reaction. Equations (2) and (3) show the synthesis of chlorine-ion-intercalated LiAl-LDHs and the lithium recovery process. The two successive steps achieved the efficient extraction of lithium from salt lake brine. The effects of crystallinity of LiAl-LDHs, slurry concentration, reaction temperature, and reaction time on the lithium recovery percentage were discussed. Under the optimal conditions, the lithium recovery of LiAl-LDHs-1 prepared from the salt lake brine reached 86.2%, and the concentration of Li+ reached 141.6 mg/L. This study provides an alternative pathway to efficiently extract and recover lithium from salt lake brine. Li++2AlCl3+6NaOH+mH2O = LiAl2(OH)6Cl·mH2O+5Cl−+6Na+ LiAl2(OH)6Cl·mH2O = Li++Cl−+2Al(OH)3+mH2O Table 1. The chemical composition of the brine after separating Mg2+ ions [24]. Mg2+ Li+ K+ Na+ B2O3 Cl- SO42- Concentration (g/L) 0.054 0.675 0.84 32.9 1.73 42.87 3.29 2. Materials and Methods 2.1. Materials (2) (3) CO32- 8.57 AlCl3·6H2O was purchased from Aladdin Industrial Corporation (Shanghai China). NaOH was obtained from Beijing Chemical Corporation Ltd. (Beijing China). 2.2. Synthesis The Mg2+ and Li+ ions are separated from salt lake brine by reaction-coupled separation technology to obtain the solution, i.e., the brine after separating Mg2+ ions [25]. The method for separating Mg2+ and Li+ is shown in the Supplementary Materials. Solution A: AlCl3·6H2O had a concentration of 46.96 g/L was dissolved in the brine of 1 L after separating Mg2+ ions. The molar concentration of the relationship was [Li+]:[Al3+] = 1:2. By evaporation and concentration, varied initial Li+ concentrations were obtained. Solution B: NaOH was dissolved in deionized water to form a clear solution in which the [NaOH] = 2 mol/L. Solution B was dropped into solution A to keep the pH value at 7 during the reaction in the crystallization reactor. The deionized water used in the experiment was boiled and cooled to room temperature. Nitrogen gas was introduced into the reaction process to remove the influence of CO32- on the experimental results. The slurry was aged in a crystallization reactor at 80 ◦C for 12 h. The solid products obtained were LiAl-LDHs following filtration, washing, and drying. LiAl-LDHs were dispersed in deionized water and heated in an oil bath at varied initial Li+ concentrations, slurry concentrations, recovery temperature, and recovery time. The solid product was recovered by filtration, washing, and drying, and the liquid phase was a lithium-bearing solution. The lithium recovery from pre-synthesized LiAl-layered double hydroxides is shown in Scheme 2.PDF Image | Lithium Recovery Pre-Synthesized Chlorine-Ion-Intercalated
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