Investigations on Single Minerals and Synthetic Ash Components for the Enrichment of Copper from Waste Incineration Bottom Ashes by Flotation

Currently, MSWI (municipal solid waste incineration) ashes are predominantly landfilled, although they can have copper contents comparable to those of low-grade ores. Based on a previously published characterization MSWI-BA, this paper presents investigations the identification potential collectors for recovery from MSWI-BA by flotation. The studies were conducted with single minerals (mainly oxide and sulfide) synthetic slag components. Collector screening included thiourea-, thiophosphate-, thiocarbamate-based collectors. In addition commercial collector mixtures, pure ureas also examined. At least one representative each group was selected more in-depth studies: thiourea S-n-dodecyle-iso-thiourea hydrochloride, thiophosphate Danaflot 245, AERO 3473, MX-5160 as mixture thiocarbamate thiophosphates. Studies influence concentration pH carried out these. addition, contact angles various metal oxides matrix composition without treatment determined. Subsequently, flotation tests mixtures individual components (quartz, glass, cement, gypsum). proved be most suitable collector, alginic acid added depressant due lack selectivity towards gypsum.