Abstract
Due to the wide applications, limited supply, and high demand, sustainable utilization of indium has become an important task. In this study, the recovery of indium from acidic extractant solutions of ITO scraps using aluminum (Al) powder was investigated. The cementation reaction of indium from HCl solution was completed within 10 min and it could be described by pseudo-first-order kinetic model. Effective recovery of indium (91.69%) at aluminum dose of 5 g/L and 25 °C was found in HCl solution. Recovery efficiency increased with aluminum dose. Results from cyclic voltammetry were used to provide information why cementation reactions did not work in H2SO4 or HNO3 solutions. Indium recovery by aluminum cementation could be an alternative process, which is simple and efficient. However, there are some drawbacks, e.g., cementation reaction was not specific as tin was recovered simultaneously with indium from solutions. Furthermore, removal and separation of indium deposit on aluminum surfaces could be another issue.
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