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Materials 2019, 12, 1968 Materials 2019, 12, x FOR PEER REVIEW 11 of 13 11 of 13 Figure 8. Lithium recovery percentage (round symbol) and Li+ concentration in the filtrate (triangle symbol) from LiAl-LDHs-1 at varied recovery times of 30 min, +60 min, 90 min, 120 min. Figure 8. Lithium recovery percentage (round symbol) and Li concentration in the filtrate (triangle symbol) from LiAl-LDHs-1 at varied recovery times of 30 min, 60 min, 90 min, 120 min. We repeated the experiments and analyzed the data under the varying concentrations, recovery temperatures, and recovery times (Tables S1–S3). The results are repeatable. We repeated the experiments and analyzed the data under the varying concentrations, recovery temperatures, and recovery times (Tables S1–S3). The results are repeatable. 4. Conclusions 4.CoLnictlhuisuimonwsasextractedfromLiAl-LDHspreparedfromsaltlakebrineusingreaction-coupled separation technology. Lithium was released from the lattice vacancies of the ordered AlO6 octahedrons Lithium was extracted from LiAl-LDHs prepared from salt lake brine using reaction-coupled in pre-synthesized LiAl-Cl-LDHs. Lithium and aluminum were effectively separated to obtain a pure separation technology. Lithium was released from the lattice vacancies of the ordered AlO6 lithium salt solution, which can be used in industrial production. As the crystallinity of LiAl-LDHs octahedrons in pre-synthesized LiAl-Cl-LDHs. Lithium and aluminum were effectively separated to decreased, the lithium recovery percentage decreased. Al3+ was detected to be dissolved in the obtain a pure lithium salt solution, which can be used in industrial production. As the crystallinity of liquid phase due to the Al-O bonds being more easily broken during the thermal reaction with low LiAl-LDHs decreased, the lithium recovery percentage decreased. Al3+ was detected to be dissolved crystallinity LiAl-LDHs. The slurry concentration had an opposite effect on the lithium recovery in the liquid phase due to the Al-O bonds being more easily broken during the thermal reaction with percentage and the Li+ concentration in the filtrate. The lithium recovery percentage decreased low crystallinity LiAl-LDHs. The slurry concentration had an opposite effect on the lithium recovery as the slurry concentration increased because the lithium-ion extraction rate was suppressed. The percentage and the Li+ concentration in the filtrate. The lithium recovery percentage decreased as the dissolution of Li+ from LiAl-LDHs affected the chemical environment of aluminum, where the 27Al slurry concentration increased because the lithium-ion extraction rate was suppressed. The chemical peak shifted to the low-field and a peak with a broad low-frequency shoulder appeared. dissolution of Li+ from LiAl-LDHs affected the chemical environment of aluminum, where the 27Al The Al-OH bond gradually formed and the metal-oxygen-metal bond was gradually broken with the chemical peak shifted to the low-field and a peak with a broad low-frequency shoulder appeared. increase of lithium recovery percentage, and the solid phase product was converted to Al(OH)3 when The Al-OH bond gradually formed and the metal-oxygen-metal bond was gradually broken with LiAl-LDHs disappeared. When the slurry concentration was 10 g/L, the lithium recovery percentage of the increase of lithium recovery percentage, and the solid phase product was converted to Al(OH)3 LiAl-LDHs-1 was 86.2% at 85 ◦C for 90 min, and the Li+ concentration in the filtrate was 141.6 mg/L. when LiAl-LDHs disappeared. When the slurry concentration was 10 g/L, the lithium recovery Al3+ was hardly detected in the solution under various reaction conditions. This work provides a percentage of LiAl-LDHs-1 was 86.2% at 85 °C for 90 min, and the Li+ concentration in the filtrate method for extracting lithium ions from salt lake brine and for obtaining a lithium-bearing solution, was 141.6 mg/L. Al3+ was hardly detected in the solution under various reaction conditions. This which is capable of directly producing lithium salts, such as Li2CO3 and LiOH. work provides a method for extracting lithium ions from salt lake brine and for obtaining a lithium-bearing solution, which is capable of directly producing lithium salts, such as Li2CO3 and Supplementary Materials: The following are available online at http://www.mdpi.com/1996-1944/12/12/1968/s1, LthieOcHon.tentofelementsinLiAl-LDHs;additionalNMRspectra,XPSO1sspectra,XRDpatterns. Author Contributions: X.X. proposed the idea and designed the experiments. Y.S. carried out the experiments. SXu.Xp.palnedmYe.nSt.aarnyalMyzaetdertihaelsd:aTtahaendfowllorowtientgheamreanauvsacirlaipbtl.eXo.Xn.l,inYe.S.a, tR.wY.w, Yw.Z.m., Mdp.Pi.cdoimsc/uxsxsxe/ds1t,hethresucoltnst.ent of elements in LiAl-LDHs; additional NMR spectra, XPS O 1s spectra, XRD patterns. Funding: This work was supported by the National Natural Science Foundation of China (Grant U1507202, U1707603, 21521005), the Key R&D Program of Qinghai Province (Grant 2017-GX-144) and the Fundamental Author Contributions: X.X. proposed the idea and designed the experiments. Y.S. carried out the experiments. Research Funds for the Central Universities (XK1803-05, XK1802-6, 12060093063). X.X. and Y.S. analyzed the data and wrote the manuscript. X.X., Y.S., R.Y., Y.Z., M.P. discussed the results. Conflicts of Interest: The authors declare no conflict of interest. Funding: This work was supported by the National Natural Science Foundation of China (Grant U1507202, U1707603, 21521005), the Key R&D Program of Qinghai Province (Grant 2017-GX-144) and the Fundamental Research Funds for the Central Universities (XK1803-05, XK1802-6, 12060093063). Conflicts of Interest: The authors declare no conflicts of interest. .PDF Image | Lithium Recovery Pre-Synthesized Chlorine-Ion-Intercalated
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