| Title | Ultrasound-assisted leaching and supported liquid membrane extraction of waste liquid crystal displays for indium recovery |
|---|---|
| ID_Doc | 17420 |
| Authors | Huang, YF; Hsia, WN; Lo, SL |
| Title | Ultrasound-assisted leaching and supported liquid membrane extraction of waste liquid crystal displays for indium recovery |
| Year | 2023 |
| Published | |
| Abstract | Indium recovery from waste liquid crystal displays (LCDs) was carried out by using ultrasoundassisted leaching (UAL) and supported liquid membrane (SLM) extraction. The leaching efficiency and purity of indium were approximately 97% and 94%, respectively, when using 0.75 M of sulfuric acid and 300 W of ultrasound power level. The highest extraction efficiency of indium was approximately 82%, obtained by using 20 vol% of D2EHPA fraction, 2 M of HCl concentration in the stripping solution and pH 3 of feed solution. The permeability coefficient, initial flux and reaction rate constant substantially increased with increasing D2EHPA fraction and feed solution pH, but HCl concentration provided little effect. If there is a synergistic effect occurring between the feed solution pH and the D2EHPA fraction, the permeability coefficient will be as high as 5.5 & mu;m/s when using pH 3 of feed solution and 20 vol% of D2EHPA fraction. The overall recovery rate of indium can be close to 80%, and the indium purity of the final product solution can be almost 100%. If indium can be completely recovered in the extraction process, the final recovery rate of indium will be higher than 97%. Based on the findings of this study, indium can be efficiently recovered from waste LCDs by using the UAL and the SLM extraction methods. |
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