Journal
PARTICUOLOGY
Volume 19, Issue -, Pages 27-34Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.partic.2014.04.008
Keywords
Ultrafine Ni powder; Production; Fluidized bed reactor; Two-stage reduction
Funding
- National Special Project for Development of Major Scientific Equipment [2011YQ12003908]
- China National Funds for Distinguished Young Scientists [21325628]
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A novel two-stage reduction process for synthesis of ultrafine nickel powder with a high purity and low density in a fluidized bed reactor has been developed in this work. The raw ultrafine NiO particles are first pre-reduced using hydrogen at lower temperatures (340-400 degrees C), followed by further reduction at higher temperatures (500-600 degrees C). The self-agglomeration of Ni particles formed during low-temperature reduction decreases the sintering activity of the newly formed ultrafine Ni particles, leading to good fluidization quality, even for the subsequent high-temperature reduction process. The agglomerated Ni particles have a high Ni content (above 99 wt%), a low density (0.78 g/cm(3)) and a uniform particle size (approximately 100 mu m). A concept design for a novel two-stage fluidized bed reactor process used to produce high-purity Ni powder was also proposed. This approach may be extended to the synthesis of other ultrafine/nanosized metals or metal oxides through a fluidization method. (C) 2014 Published by Elsevier B.V. on behalf of Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences.
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