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Updated: Jun 22, 2025

Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand
Published on: September 8, 2016
Instant Interlayer Restoration Strategy for Lithium Adsorption Engineering Enhancement in Sulfate-type Brines
Jun Chen1,2, Sen Lin1,2, Jianguo Yu1,3
1National Engineering Research Center for Integrated Utilization of Salt Lake Resources, East China University of Science and Technology, Shanghai 200237, China.
Abstract:
It was confirmed that the detrimental effect of SO42- on Li+ desorption and readsorption intensified with the increase of the SO42-/Cl- ratio, resulting in application limitations of aluminum-based adsorbent (Li/Al-LDHs) in sulfate-type brines. Based on the interlayer anion exchangeability of Li/Al-LDHs, a one-step interlayer restoration strategy was designed with the assistance of molecular dynamics to rapidly substitute the intercalated SO42- with preferentially desorbed Cl-, aiming to fundamentally address the damage to the cycling performance. The strategy effectiveness was verified by the restored adsorption and desorption capacities in various sulfate-type brines. Furthermore, enhanced lithium extraction processes for sulfate-type brines were established and showed universal applicability for complex brines with different compositions during fixed-bed cycles. By regulating the implementation frequency, the Li+ extraction efficiency was improved, in which the extraction amount per unit time could increase by more than 100% compared with the conventional process.
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