Recovery of valuable metals from WPCB fines by centrifugal gravity separation and froth flotation

This paper reports physical and physicochemical routes for the recycling of gold, silver, copper from waste printed circuit boards (WPCBs). The results optical micrographs indicated that metals matrix are substantially separated slot after comminution process. effects various operational factors, including gravitational force fluidization water, centrifugal separators on separation performance WPCB fines were experimentally studied. A heavy fraction assaying 363 g/t Au, 381 Ag, 40.1% Cu was obtained with recovery 95.6%, 81.7%, 96.0%, respectively, using Knelson concentrator. Different pH value pulp particle size, flotation WPCBs powder examined. production stable foams resulted natural hydrophobic response plastics a sunken product 472 537 52.7% successfully produced 93.4% 84.3% 95.8% at 50 methyl isobutyl carbinol (MIBC) as frother. In general, concentration valuable provided simple eco-friendly enrichment technique before final chemical