Estudio de la recuperación de indio a partir de pantallas de cristal líquido descartadas

Abstract

In the present study it is proposed to mitigate the environmental impact caused by electronic waste correspond to screens and monitors through the generation of a technological alternative that allow the valuation of discarded crystal screens based on the recovery of Indium. 96% Indium recoveries were obtained in a 4 hour leaching time with a solids content of 20%. The purification of indium was studied by extraction with the use of 2 extractants, diethyl hexyl phosphate (DEHPA) and tributyl phosphate (TBP) with 2 solvents (diesel and hexane), the ratio of the organic phase to the aqueous phase in the extraction and the extractant concentration. An 89% organic phase extraction of indium with a concentration of 0.025 M extractant (DEHPA) and diesel as diluent was obtained in a contact time of 10 minutes. For re-extraction, the relationship between the aqueous phase and the organic phase in addition to the concentration of sulfuric acid was tested. Re-extraction of indium was 95 % with a concentration of 8 M acid. An evaporation was carried out where the indium sulphate was obtained the product carried a calcination process where indium oxide was obtained.