Thiourea leaching of gold from processed municipal solid waste incineration residues

• DOI: 10.1007/s10163-022-01476-9
• Publication Date: 2022-08-09T21:23:42Z
• Authors: Sergey M. Abramov; Jing He; Dominik Wimmer; E. Marie Muehe; Thomas Helle; Harald Thorwarth; Andreas Kappler
• Keywords: Gold extraction; Scrap

Abstract Incineration is one of the key technologies in disposal municipal waste, which produces solid waste incineration (MSWI) residues with high valuable metal contents. The recycling strategy for MSWI typically focused on recovery scrap metals yielding processed (PIR) as main byproduct. However, PIR still contains metals, particularly gold, cannot be extracted by conventional methods. Here, we evaluated feasibility using 0.5–2.0 mm grain size fraction containing 28.82 ± 1.62 mg/kg gold raw material a two-stage extraction process. In first stage alkalic fine-grained was acidified solution 20% (v/v) HCl-containing flue gas cleaning liquid that obtained plant itself product. second leached thiourea Fe 3+ an oxidant. Application thiourea-Fe leaching system resulted 16.4 1.56 from within 6 h incubation. Due to market prices, upscaling suggested technology can represent suitable and other residues.