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- W2040349728 abstract "Abstract A new hydrometallurgical process was proposed for recovering high-purity ZnO nanoparticles and NiO strips from the spent Ni/ZnO catalyst. Extractions of zinc, nickel and iron achieved 98.3%, 95.1% and 72.2%, respectively, after leaching for 60 min at 45 °C with the liquor/solid ratio of 6 mL g − 1 and 15 wt.% HCl, and the leach solution contained 127.87 g L − 1 zinc, 3.23 g L − 1 nickel and 0.77 g L − 1 iron. Iron separation was achieved by adding KMnO 4 at an initial pH of 4.75. Taguchi method was successfully used to evaluate the zinc cementation method and the dimethylglyoxime (DMG) precipitation method for nickel removal with two L9 (3 4 ) orthogonal arrays. Among these experiments, the attention has been attracted to the DMG precipitation method since it can be performed at lower temperature (60°C), achieve lower Ni 2+ residual concentration (0.6 mg L − 1 ) and recover nickel as 99.04 wt.% NiO strips via one-step thermal decomposition. 99.70 wt.% ZnO nanoparticles were obtained by a thermal decomposition of the basic zinc carbonate which was precipitated by adding NH 4 HCO 3 to the purified solution. A complete hydrometallurgical process flowsheet was proposed." @default.
- W2040349728 created "2016-06-24" @default.
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- W2040349728 date "2012-06-01" @default.
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- W2040349728 title "A hydrometallurgical route to produce ZnO nanoparticles and NiO strips from the spent Ni/ZnO catalyst" @default.
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- W2040349728 doi "https://doi.org/10.1016/j.hydromet.2012.03.009" @default.
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