Chelator-Enhanced nanofiltration process for selective lithium extraction and Magnesium utilization from salt lake brines

纳滤 盐湖 盐(化学) 萃取(化学) 化学 锂(药物) 螯合作用 无机化学 色谱法 地质学 有机化学 古生物学 内分泌学 构造盆地 医学 生物化学
作者
M.S. Yong,Meng Tang,Liangliang Sun,Jindi Yang,Zhuyuan Wang,Chao Xing,Huadong Tian,Lei Xie,Zhouyou Wang,Xiwang Zhang,Zhikao Li
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:379: 134967-134967 被引量:5
标识
DOI:10.1016/j.seppur.2025.134967
摘要

• CEN enables selective Li + /Mg 2+ separation and multi-resource recovery. • HEDTA 3− balances binding strength and selectivity, solubility, and regeneration. • Two-pass filtration enriches Li + /Mg 2+ ratio from 0.0284 to 13.04 in Dongtai brine. • CNE produces battery-grade Li 2 CO 3 and high-purity Mg products. Membrane-based separation processes represent a promising approach for lithium (Li) extraction from salt lake brines. In this study, we developed a chelator-enhanced nanofiltration (CEN) process that synergically integrates selective complexation, membrane separation, and chelator regeneration to simultaneously recover and utilize Li and magnesium (Mg) from high-salinity, multiple-component salt lake brines. Through systematic screening evaluating critical parameters including binding strength, complexation selectivity, separation efficiency, water solubility, and regeneration potential, (2-hydroxyethyl)ethylenediaminetriacetic acid (HEDTA) emerged as the suitable chelator, forming negatively-charged complexes with Mg 2+ while leaving Li + unbound in salt lake brines. The CEN process exhibited excellent Li + /Mg 2+ separation factors across various operating and brine conditions and maintained stable performance during 15 days of continuous operation with minimal membrane fouling observed. A two-pass filtration configuration was used to treat a simulated Dongtai Lake Brine with a salinity of 280.76 g●L −1 . The Li + /Mg 2+ ratio increased from 0.0284 to 13.04, a nearly 480-fold enhancement, thereby directly fulfilling industrial Li + precipitation range of 10–30. Furthermore, the integrated CEN system achieved efficient chelator regeneration (99.78 %) while simultaneously producing multiple valuable products: battery-grade Li 2 CO 3 (99.91 % purity), hexagonal nanostructured Mg(OH) 2 (99.49 % purity), and high-purity MgO (99.31 % purity). This multiple-product approach effectively enhanced resource valorization of salt lake brines and demonstrated a process-oriented thinking of membrane-based selective ion-ion separation for complex brine treatment and resource recovery.
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