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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Nanofiltration Membrane Characterization and Application: Extracting Lithium in Lepidolite Leaching Solution.

Lin Gao1,2,3, Huaiyou Wang1,2, Yue Zhang1,2,3

  • 1Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China.

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This study demonstrates nanofiltration

Keywords:
aluminumlepidolite leaching solutionlithiummembranenanofiltration

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Lepidolite is a lithium-bearing mineral.
  • Extracting lithium from lepidolite presents challenges.
  • Efficient separation of lithium and aluminum is crucial.

Purpose of the Study:

  • To evaluate the feasibility of using nanofiltration for lithium and aluminum separation from lepidolite leaching solutions.
  • To investigate the performance of different nanofiltration membranes for this separation.
  • To understand the relationship between membrane properties and separation efficiency.

Main Methods:

  • Utilized four commercial nanofiltration (NF) membranes (DK, DL, NF270, Duracid NF).
  • Characterized membranes using FT-IR, hydrophobicity, zeta potential, morphology, thickness, pore size, and hydraulic permeability.
  • Assessed ion retention (SO42-, Li+), Li+/Al3+ separation efficiency, and the influence of other cations (K+, Na+, Ca2+).

Main Results:

  • The DK membrane showed high permeate flux and superior Li+/Al3+ separation efficiency (separation factor of 471.3).
  • Membrane properties like pore size, surface smoothness, and zeta potential influenced separation performance.
  • Nanofiltration demonstrated effective separation of lithium and aluminum.

Conclusions:

  • Nanofiltration is a feasible and efficient method for separating lithium and aluminum from lepidolite leaching solutions.
  • The DK membrane is a promising candidate for industrial application.
  • This study provides insights for developing strategies for lithium extraction from lepidolite.