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Research on the preparation of Ni/Al2O3 powder by fluidized crystallization granulation–hydrogen reduction |
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| Authors: | Xin Wang Lintao Gui Haitao Yang Chaoquan Hu Xiaohua Yu Hongtao Li |
| Affiliation: | 1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, China;2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, China;3. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China;4. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China Nanjing IPE Institute of Green Manufacturing Industry, Nanjing, China |
| Abstract: | This paper proposes a new process route for the preparation of Ni/Al2O3 composite powder through fluidized crystallization granulation–hydrogen reduction and investigates the effects of process feasibility, nickel concentration, nucleation method, and hydrogen reduction on Ni/Al2O3-coated powder. The decrease in nickel concentration, heterogeneous nucleation, and natural air-drying properties of precursor particles was beneficial to the formation of a complete and uniform cladding layer, and the increase in hydraulic retention time could improve the thickness of the cladding layer. The optimum process involves a nickel concentration of 50 mg/L; hydraulic residence time of 75 h to ensure heterogeneous nucleation; two-step hydrogen reduction of precursor particles to obtain a complete and uniform Ni/Al2O3 cladding layer; and a powder surface nickel content of 59.5%. |
| Keywords: | composite powder fluidization hydrogen reduction liquid–solid-fluidized bed Ni/Al2O3-coated powder |