1. Selective leaching of indium from spent LCD screens by siderophore desferrioxamine E.
- Author
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Zheng, Kun, Benedetti, Marc F., Jain, Rohan, Guy, Bradley M., Pollmann, Katrin, and van Hullebusch, Eric D.
- Subjects
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LEACHING , *DEFEROXAMINE , *CHELATING agents , *LIQUID crystal displays , *APPROPRIATE technology - Abstract
Given the criticality of indium (In) in high-tech applications, spent LCD screens can represent a viable secondary In resource. In this work, an innovative and alternative technology to selectively leach In from spent LCD screens using a microbial chelating agent, desferrioxamine E (DFOE), was developed. Indium was concentrated from spent LCD screens by implementing an adapted pre-treatment procedure, allowing the isolation of an indium-rich glassy fraction. During leaching, the competition between aluminum (Al) and In for complexation with DFOE leads to the precipitation of In(OH) 3 at low DFOE concentrations (12–240 µM). After adjusting the optimal conditions (fraction size: 0–36 μM, pH: 5.5, S/L ratio: 1 g/L, 25 °C), the In leaching yield reached 32%, ten times higher than Al over 90 days with 5 mM DFOE. Thus, achieving high In recovery is possible through i) prolonging leaching durations, ii) selective leaching, and iii) minimizing Al interference. This is the first attempt to selectively leach In using a selected siderophore from end-of-life products with high concentrations of non-targeted elements (i.e. Al, Si, and Ca). This study demonstrates the potential of generating indium-rich leachates, which can be subsequently processed through the GaLIophore technology for In refining. [Display omitted] • A novel bio-based indium leaching method is proposed. • Model elucidates indium leaching mechanism. • Improved n(DFOE)/n(In) ratio lessens aluminum competition in indium leaching. • Optimal conditions yield high indium leaching. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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