Recovery of gold from waste electrical and electronic equipment (WEEE) using ammonium persulfate
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[1] Universidad de Antioquia
Universidad de Antioquia
Colombia
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- Localización: Waste management, ISSN-e 0956-053X, Vol. 57, 2016 (Ejemplar dedicado a: WEEE: Booming for Sustainable Recycling), págs. 113-120
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
This paper presents a novel methodology to recover gold from waste electrical and electronic equipment (WEEE) using ammonium persulfate ((NH4)2S2O8). Gold was recovered as a fine coating using substrate oxidation without shredding or grinding process. The WEEE sample was characterized giving values of Au: 1.05 g/kg, Fe: 86.00 g/kg, Ni: 73.64 g/kg, Cu: 26.65 g/kg. The effect of (NH4)2S2O8 concentration (0.22–1.10 M), oxygen (0.0–1.4 L/min) and L/S ratio (10–30 mL/g) on the main responses (substrate oxidation and Au recovery) was investigated implementing response surface methodology with numerical optimization. A quadratic model was developed and quantities greater than 98% of Au were recovered. The findings presented suggest that, optimized quantities of ammonium persulfate in aqueous highly oxygenated media could be used to extract superficial gold from WEEE.
