|About this Abstract
||Part C-1: Hydrometallurgy 2018
||The Potential of Deep Eutectic Solvent Ionic Liquids for Processing Chalcophile Critical Elements
||Gawen R. T. Jenkin, Hugh Graham, Daniel J. Smith, Andrew P. Abbott, David A. Holwell, Evangelia Zygouri, Robert C. Harris
|On-Site Speaker (Planned)
||Gawen R. T. Jenkin
Gold and copper concentrates often contain high enrichments of scarce or critical elements such as Te, Bi and Sb, but there are few financial incentives for recovery these elements as by-products. Deep eutectic solvents (DES) may provide novel processing opportunities – these are a form of ionic liquid that are mixtures of salts such as choline chloride with hydrogen-bond donors such as urea. DESs are environmentally benign, yet chemically stable and, furthermore, the components are already produced in large quantities at low cost.
We have demonstrated that gold is rapidly dissolved in DES by iodine oxidation, whereas many base metal sulfides are unreactive or react only slowly. However, many trace minerals that host the majority of Te, Bi and Sb in a concentrate, such as tellurides, or Bi- or Sb-bearing sulfosalts, are rapidly dissolved at similar rates to gold, suggesting routes to recovering gold and critical elements.
||Planned: At-meeting proceedings