Thiourea leaching of gold from processed municipal solid waste incineration residues

Abstract

Incineration is one of the key technologies in disposal of municipal waste, which produces municipal solid waste incineration (MSWI) residues with high valuable metal contents. The recycling strategy for the MSWI residues is typically focused on the recovery of scrap metals yielding processed municipal solid waste incineration residues (PIR) as the main byproduct. However, the PIR still contains valuable metals, particularly gold, which cannot be extracted by conventional methods. Here, we evaluated the feasibility of using the 0.5–2.0 mm grain size fraction of PIR containing 28.82 ± 1.62 mg/kg of gold as raw material for a two-stage extraction process. In the first stage the alkalic fine-grained PIR was acidified with a solution of 20% (v/v) of HCl-containing flue gas cleaning liquid that is obtained by the municipal waste incineration plant itself as a waste product. In the second stage we leached the acidified fine-grained PIR by thiourea with Fe3+ as an oxidant. Application of the thiourea-Fe3+ leaching system resulted in recovery of 16.4 ± 1.56 mg/kg of gold from the fine-grained PIR within 6 h of incubation. Due to high gold market prices, upscaling of the suggested technology can represent a suitable strategy for gold recovery from PIR and other MSWI residues.

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

“…The present study was optimized as per Jing-ying et al, which contained 40 mL of a mixture solution containing 24 g/L thiourea, 0.6% Fe 3+ , and 0.5 mol/L sulfuric acid for pH adjustment (pH = 2) for heating at 25 °C to extract Au, Ag, and Cu . Mild oxidants such as Fe 3+ and acidic medium (pH = 1–2) help in maintaining the stability of thiourea and improving the extraction efficiency of gold. ,,, The stirring speed was kept at 150 rpm to improve agitation and mass transfer . However, it was found that stirring speed played no major role in accelerating gold extraction using acid thiourea solution. , In the current leaching experiment, 1 g of the solid residue is taken from our previous study .…”

“…32,33,40,41 The stirring speed was kept at 150 rpm to improve agitation and mass transfer. 42 However, it was found that stirring speed played no major role in accelerating gold extraction using acid thiourea solution. 43,44 In the current leaching experiment, 1 g of the solid residue is taken from our previous study.…”