Introduction
G-200 and G-300 are advanced titanium-based ion exchangers developed for direct lithium extraction (DLE). Proper testing of these adsorbents is essential to achieve reliable results and optimize industrial application. This article outlines key testing guidelines and precautions for both G-200 and G-300 lithium adsorbents.
1. Activation of the Adsorbent
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Recommended solution: 0.2–0.5 M HCl or H₂SO₄.
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Endpoint control: Stop activation when the leached lithium concentration drops below 10 mg/L.
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Avoid over-activation: Excessive acid use or extended time may damage the adsorbent structure and reduce performance.
2. Lithium Adsorption Process
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Time: About 4 hours is sufficient to reach adsorption equilibrium.
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Application method:
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G-200 is suitable for fixed-bed column continuous ion exchange.
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G-300 can be applied in fixed-bed, moving-bed, or stirred adsorption systems.
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Flow rate: Maintain 6–10 bed volumes per hour to prevent agglomeration.
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pH adjustment: Adjust brine to pH 8–9 for higher adsorption efficiency. When magnesium is present, allow precipitation to settle and filter before adsorption.
3. Desorption of Lithium
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Timing: Begin desorption immediately after adsorption to avoid lithium diffusing into deeper pores.
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Desorption solution: Use NaOH or Na₂CO₃ solutions.
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Efficiency: Under normal conditions, more than 90% desorption efficiency can be achieved within 1 hour.
4. Sample Storage and Reuse
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Short-term preservation: If immediate adsorption or desorption is not possible, store the activated adsorbent in the original brine.
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Avoid drying: Exposure to air may reduce material performance.
5. Data Analysis and Results
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Adsorption capacity: Report results in mg Li per g adsorbent, along with desorption efficiency.
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Lithium selectivity: G-200 and G-300 maintain high lithium selectivity in brines with sodium, calcium, or magnesium, but efficiency may decline slightly.
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Industrial simulation: Multi-cycle tests are recommended to evaluate stability, dissolution resistance, and mechanical strength.
6. Safety Considerations
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Conduct all testing in a well-ventilated laboratory.
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Wear protective gloves, goggles, and dust masks.
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Dispose of waste solutions according to local regulations.
Conclusion
By following these testing guidelines, researchers and engineers can achieve more reliable and reproducible results with G-200 and G-300 lithium adsorbents. These titanium-based ion exchangers offer excellent lithium selectivity, strong mechanical strength, and proven stability, making them ideal for direct lithium extraction projects.
For technical support or customized testing solutions, please contact Inter-China Chemical.