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Direct Lithium Extraction from a Complex Acidic Brine Using Aluminum Hydroxide.

Alan Piao1, Jianjun Chen2, Chengi Hung2

  • 1Oak Park High School, 899 Kanan Rd, Oak Park, California 91377, United States.

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|May 25, 2026
PubMed
Summary
This summary is machine-generated.

Aluminum hydroxide efficiently extracts lithium from complex brines. Heat treatment and water rinsing recover purified lithium, separating it from other metals.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Lithium (Li) extraction from complex brines is challenging due to low concentrations and interfering metal cations.
  • Aluminum hydroxide (Al-(OH)3) is explored as a potential sorbent for direct lithium extraction.

Purpose of the Study:

  • To evaluate aluminum hydroxide as a sorbent for direct lithium extraction from acidic brines.
  • To investigate the effects of pH and temperature on lithium extraction efficiency and selectivity.
  • To develop a method for recovering purified lithium from the sorbent.

Main Methods:

  • Extraction experiments using aluminum hydroxide with a complex brine containing lithium and multiple metal cations.
  • Adjusting brine pH to 11 to precipitate interfering cations (Mn2+, Fe2+).
  • Heat treatment of the lithium-loaded sorbent to form Boehmite (γ-AlO-(OH)).
  • Room-temperature water rinsing of Boehmite for lithium recovery and purification.

Main Results:

  • Aluminum hydroxide extracted most cations except Ca2+ in neutralized brine.
  • Higher temperatures increased extraction but decreased selectivity.
  • Adjusting pH to 11 precipitated Mn2+ and Fe2+, potentially forming competing Ca-Al layered double hydroxide (LDH) structures.
  • Heat treatment converted LDH to Boehmite, facilitating Li+ recovery.
  • Water rinsing of Boehmite yielded high lithium recovery and separation from other cations.

Conclusions:

  • Aluminum hydroxide is a viable sorbent for direct lithium extraction from complex brines.
  • Optimizing pH and temperature is crucial for efficient extraction and selectivity.
  • A two-step process (extraction followed by heat treatment and rinsing) enables high-purity lithium recovery.