Working Principle and Application of Lithium Extraction Adsorbent from Salt Lake
2025/07/28
Salt lake lithium extraction adsorbents are the core materials for efficiently extracting lithium from low-grade salt lake brine. Their working principle is based on selective adsorption-desorption cycles. In salt lake brine, lithium ion concentration is usually low and coexists with metal ions such as sodium, potassium, and magnesium. The adsorbent, through specific chemical structures or surface functional groups, has a stronger affinity for lithium ions, thereby preferentially capturing lithium ions in complex systems. For example, titanium-based adsorbents form stable coordination with lithium ions through vacancy structures in the lattice, while organic amine adsorbents achieve selective binding through ion exchange.
After the adsorption process is completed, lithium ions are stripped from the adsorbent surface through desorption operations. Common desorption methods include acid leaching (such as hydrochloric acid, sulfuric acid), alkaline washing, or salt solution elution, utilizing high-concentration desorbents to compete for adsorption sites with lithium ions, promoting their transfer into the liquid phase. The desorbed adsorbent can be regenerated and reused, forming a closed-loop process of "adsorption - desorption - regeneration," significantly reducing costs.
In terms of application, adsorbent technology is especially suitable for salt lakes with high magnesium-to-lithium ratios, which are difficult to treat with traditional precipitation methods, while adsorbents can effectively separate magnesium and lithium ions. Currently, titanium-based, aluminum-based, and composite oxide adsorbents have been scaled up in projects at Qinghai salt lakes, Tibet salt lakes, and others, with single-unit annual capacities reaching several thousand tons. Compared to solvent extraction methods, they have advantages of being environmentally friendly and energy-efficient; compared to membrane separation methods, they have stronger adaptability to brine and lower maintenance costs, becoming one of the key technologies driving the industrialization of lithium extraction from salt lakes.
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