TY - JOUR A1 - Holm, Olaf A1 - Wollik, Elia A1 - Bley, Teresa Johanna T1 - Recovery of copper from small grain size fractions of municipal solid waste incineration bottom ash by means of density separation T2 - International Journal of Sustainable Engineering N2 - Small grain size fractions of municipal solid waste incineration (MSWI) bottom ash (BA) contain elemental and chemically bonded metals in appreciable amounts, especially copper. Investigations with a centrifugal concentrator were carried out using samples, which had been treated with different impact devices. Partly the impacts of single devices were visible in outlines, but mostly the surfaces of the metals were still covered with mineral residues. To generate copper rich fractions, parameters of the separation process should ensure mass yields <2%, best between 0.5 and 1%. The density of the concentrates is then generally >3.2 g/cm3. Best results were achieved with material from a special treatment train which is adapted to grain sizes <2 mm. Reliable copper contents between 20 and 40% (single runs >50%) could be realised. However, considering the required mass yields, referred to this subset only 150–170 g copper would be recovered from 1 Mg MSWI BA. Furthermore, this copper is only in parts present in elemental form. A dependable added value of such treatment step seems to be given only, if that enables a recycling of the mineral aggregates (tailings) in parallel to avoid landfill costs. PB - Taylor and Francis CY - London KW - Bottom ash KW - Density separation KW - Copper PY - 2018 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/46148 AN - OPUS4-46148 UR - https://www.tandfonline.com/doi/full/10.1080/19397038.2017.1355415 SN - 1939-7038 VL - 11 IS - 4 SP - 250 EP - 260 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany