Highly Efficient Lithium Recovery from Pre-Synthesized Chlorine-Ion-Intercalated LiAl-Layered Double Hydroxides via a Mild Solution Chemistry Process

Highly Efficient Lithium Recovery from Pre-Synthesized Chlorine-Ion-Intercalated LiAl-Layered Double Hydroxides via a Mild Solution Chemistry Process

Lithium extraction from salt lake brine is critical for satisfying the increasing demand of a variety of lithium products. We report lithium recovery from pre-synthesized LiAl-layered double hydroxides (LDHs) via a mild solution reaction. Lithium ions were released from solid LiAl-LDHs to obtain a l...

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Main Authors: Ying Sun, Rongping Yun, Yufeng Zang, Min Pu, Xu Xiang
Format: Article
Language:English
Published: MDPI AG 2019-06-01
Series:Materials
Subjects:
lithium recovery
LiAl-LDHs
reaction-coupled separation technology
salt lake brine
Online Access:https://www.mdpi.com/1996-1944/12/12/1968
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spelling doaj-7e0db2e03e344c2787acc756b5f2a58d2020-11-25T00:16:04ZengMDPI AGMaterials1996-19442019-06-011212196810.3390/ma12121968ma12121968Highly Efficient Lithium Recovery from Pre-Synthesized Chlorine-Ion-Intercalated LiAl-Layered Double Hydroxides via a Mild Solution Chemistry ProcessYing Sun0Rongping Yun1Yufeng Zang2Min Pu3Xu Xiang4State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaState Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaState Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaState Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaState Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaLithium extraction from salt lake brine is critical for satisfying the increasing demand of a variety of lithium products. We report lithium recovery from pre-synthesized LiAl-layered double hydroxides (LDHs) via a mild solution reaction. Lithium ions were released from solid LiAl-LDHs to obtain a lithium-bearing solution. The LiAl-LDHs phase was gradually transformed into a predominantly Al(OH)<sub>3</sub> phase with lithium recovery to the aqueous solution. The lithium recovery percentage and the concentration of the lithium-bearing solution were dependent on the crystallinity of LiAl-LDHs, the initial concentration of the LiAl-LDHs-1 slurry, the reaction temperature, and the reaction time. Under optimized conditions, the lithium recovery reached 86.2% and the Li<sup>+</sup> concentration in the filtrate is 141.6 mg/L. Interestingly, no aluminum ions were detected in the filtrate after solid&#8722;liquid separation with high crystallinity LiAl-LDHs, which indicated the complete separation of lithium and aluminum in the liquid and solid phases, respectively. The <sup>27</sup>Al NMR spectra of the solid products indicate that lithium recovery from the lattice vacancies of LiAl-LDHs affects the AlO<sub>6</sub> coordination in an octahedral configuration of the ordered Al(OH)<sub>3</sub> phase. The XPS O 1<i>s</i> spectra show that the O<sub>ad</sub> peak intensity increased and the O<sub>L</sub> peak intensity decreased with the increasing lithium recovery, which indicated that the Al-OH bond was gradually formed and the metal&#8722;oxygen&#8722;metal bond was broken.https://www.mdpi.com/1996-1944/12/12/1968lithium recoveryLiAl-LDHsreaction-coupled separation technologysalt lake brine
collection DOAJ
language English
format Article
sources DOAJ
author Ying Sun
Rongping Yun
Yufeng Zang
Min Pu
Xu Xiang
spellingShingle Ying Sun
Rongping Yun
Yufeng Zang
Min Pu
Xu Xiang
Highly Efficient Lithium Recovery from Pre-Synthesized Chlorine-Ion-Intercalated LiAl-Layered Double Hydroxides via a Mild Solution Chemistry Process
Materials
lithium recovery
LiAl-LDHs
reaction-coupled separation technology
salt lake brine
author_facet Ying Sun
Rongping Yun
Yufeng Zang
Min Pu
Xu Xiang
author_sort Ying Sun
title Highly Efficient Lithium Recovery from Pre-Synthesized Chlorine-Ion-Intercalated LiAl-Layered Double Hydroxides via a Mild Solution Chemistry Process
title_short Highly Efficient Lithium Recovery from Pre-Synthesized Chlorine-Ion-Intercalated LiAl-Layered Double Hydroxides via a Mild Solution Chemistry Process
title_full Highly Efficient Lithium Recovery from Pre-Synthesized Chlorine-Ion-Intercalated LiAl-Layered Double Hydroxides via a Mild Solution Chemistry Process
title_fullStr Highly Efficient Lithium Recovery from Pre-Synthesized Chlorine-Ion-Intercalated LiAl-Layered Double Hydroxides via a Mild Solution Chemistry Process
title_full_unstemmed Highly Efficient Lithium Recovery from Pre-Synthesized Chlorine-Ion-Intercalated LiAl-Layered Double Hydroxides via a Mild Solution Chemistry Process
title_sort highly efficient lithium recovery from pre-synthesized chlorine-ion-intercalated lial-layered double hydroxides via a mild solution chemistry process
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2019-06-01
description Lithium extraction from salt lake brine is critical for satisfying the increasing demand of a variety of lithium products. We report lithium recovery from pre-synthesized LiAl-layered double hydroxides (LDHs) via a mild solution reaction. Lithium ions were released from solid LiAl-LDHs to obtain a lithium-bearing solution. The LiAl-LDHs phase was gradually transformed into a predominantly Al(OH)<sub>3</sub> phase with lithium recovery to the aqueous solution. The lithium recovery percentage and the concentration of the lithium-bearing solution were dependent on the crystallinity of LiAl-LDHs, the initial concentration of the LiAl-LDHs-1 slurry, the reaction temperature, and the reaction time. Under optimized conditions, the lithium recovery reached 86.2% and the Li<sup>+</sup> concentration in the filtrate is 141.6 mg/L. Interestingly, no aluminum ions were detected in the filtrate after solid&#8722;liquid separation with high crystallinity LiAl-LDHs, which indicated the complete separation of lithium and aluminum in the liquid and solid phases, respectively. The <sup>27</sup>Al NMR spectra of the solid products indicate that lithium recovery from the lattice vacancies of LiAl-LDHs affects the AlO<sub>6</sub> coordination in an octahedral configuration of the ordered Al(OH)<sub>3</sub> phase. The XPS O 1<i>s</i> spectra show that the O<sub>ad</sub> peak intensity increased and the O<sub>L</sub> peak intensity decreased with the increasing lithium recovery, which indicated that the Al-OH bond was gradually formed and the metal&#8722;oxygen&#8722;metal bond was broken.
topic lithium recovery
LiAl-LDHs
reaction-coupled separation technology
salt lake brine
url https://www.mdpi.com/1996-1944/12/12/1968
work_keys_str_mv AT yingsun highlyefficientlithiumrecoveryfrompresynthesizedchlorineionintercalatedliallayereddoublehydroxidesviaamildsolutionchemistryprocess
AT rongpingyun highlyefficientlithiumrecoveryfrompresynthesizedchlorineionintercalatedliallayereddoublehydroxidesviaamildsolutionchemistryprocess
AT yufengzang highlyefficientlithiumrecoveryfrompresynthesizedchlorineionintercalatedliallayereddoublehydroxidesviaamildsolutionchemistryprocess
AT minpu highlyefficientlithiumrecoveryfrompresynthesizedchlorineionintercalatedliallayereddoublehydroxidesviaamildsolutionchemistryprocess
AT xuxiang highlyefficientlithiumrecoveryfrompresynthesizedchlorineionintercalatedliallayereddoublehydroxidesviaamildsolutionchemistryprocess
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