Precious metal recovery

Diethyl carbonate (DEC) was evaluated as a green alternative to methyl isobutyl ketone (MIBK) and dibutyl carbitol (DBC) for the recovery of gold from copper-rich sources, such as anode slimes, by ...

Solvent extraction of gold(III) with diethyl carbonate

A review of biocyanidation as a sustainable route for gold recovery from primary and secondary low-grade resources

Aqueous Photocatalytic Recycling of Gold and Palladium from Waste Electronics and Catalysts

Abstract Gold is a scarce element in the Earth's crust but indispensable in modern electronic devices. New, sustainable methods of gold recycling are essential to meet the growing eco‐social demand of gold. Here, we describe a simple, inexpensive, and environmentally benign dissolution of gold under mild conditions. Gold dissolves quantitatively in ethanol using 2‐mercaptobenzimidazole as a ligand in the presence of a catalytic amount of iodine. Mechanistically, the dissolution of gold begins when I2 oxidizes Au0 and forms a [AuII2]− species, which undergoes subsequent ligand‐exchange reactions and forms a stable bis‐ligand AuI complex. H2O2 oxidizes free iodide and regenerated I2 returns back to the catalytic cycle. Addition of a reductant to the reaction mixture precipitates gold quantitatively and partially regenerates the ligand. We anticipate our work will open a new pathway to more sustainable metal recycling with the utilization of just catalytic amounts of reagents and green solvents.

https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/anie.202117587

Iodine‐Catalysed Dissolution of Elemental Gold in Ethanol

Gold leaching in iodine-iodide solution has been intensely researched in 1980s; while due to the high cost, it has not been applied in industry. Currently, as the drawbacks of other hydrometallurgi...

J Y Li

Papers

Recovery of gold in iodine-iodide system – a review