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...

Secondary zinc oxide (SZO), which comes from the industry, is an important secondary resource of and other valuable metals. In this study, production feasibility rationality a cleaner recovery process using SZO hydrometallurgical method were described. Zinc extraction promoted by addition ammonium bicarbonate to NH3–H2O system, maximum could be close 80% at optimum leaching conditions stirring ...

Waste fluorescent powder contains a large amount of rare earth elements, which have high value for recovery and utilization. In order to achieve the rapid efficient leaching elements in these waste phosphors, microwave-assisted Y Eu from phosphor with hydrochloric acid was studied. The maximum rates (99.84%) (89.82%) were obtained at 600 W microwave power, 60 min radiation time °C. kinetics sho...

High levels of potentially leachable toxic metals such as Pb, Cd, and Cr, in the ash residues require consideration of treatment technologies prior to disposal or utilization of the ashes in other applications. Extraction studies revealed information on the leaching characteristics of the ashes and on the ability of the extraction solutions to separate these metals from the ash matrix. The kine...

Principles for designing self-healing water-splitting catalysts are presented together with a formal kinetics model to account for the key chemical steps needed for self-healing. Self-healing may be realized if the catalysts are able to self-assemble at applied potentials less than that needed for catalyst turnover. Solution pH provides a convenient handle for controlling the potential of these...

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