Properties and Kinetics of Selective Zinc Leaching with Choline Chloride and Urea

A choline chloride-urea (ChCl-urea) deep eutectic solvent (DES) was used to experimentally investigate the secondary recovery of zinc from zinc-bearing dust sludge via a leaching process. The effects varying liquid–solid ratio, temperature, stirring speed, and time on efficiency were determined, optimum values these parameters found be 15:1, 90 °C, 400 rpm, 600 min, respectively, at which 86.87% achieved. XRF EDS analyses confirmed that content in decreased noticeably after leaching, while those other elements did not, indicating selective efficient zinc. study kinetics showed reaction conforms nuclear shrinkage model without solid product layer formation, calculated apparent activation energy is 22.16 kJ/mol.