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Improvement of Impeler Blade Structure for Gas Injection Refining under Mechanical Stirring

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Abstract

The impeler blade structure for gas injection refining under mechanical stirring has been explored by water model experiments. A sloped swept-back blade impeler is proposed for the purpose. The central part of the impeler is diskG or plate-shaped, and the blades are fited to the side of the disk or plate. In addition, a disk is put on the top side of the impeler blades. The impeler can strengthen the radial and downward flow between the blades and weaken the swirl flow in the zone above the impeler. These efects on flow phenomena are favorable for disintegration and wide dispersion of bubbles which are injected from a nozzle atached to the center of the underside of the impeler. In addition, the sloped swept-back impeler requires less power consumption. The impeler shaft should be placed away from the vessel center so as to disperse the injected bubbles widely in the bath under mechanical stiring even with unidirectional impeler rotation and without instaling bafles. The number of gas holes in the nozzle and the direction of gas injection have a litle effect on the bubble disintegration and dispersion in the bath. Highly eficient gas injection refining can be established under the conditions of proper impeler size, larger nozzle immersion depth, larger eccentricity and rotation speed of the impeler. The sloped swept-back blade impeler can decrease the power consumption and yet improve the bubble disintegration and wide dispersion in the bath.

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Authors and Affiliations

  1. Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education, School of Materials and Metalurgy, Northeastern University, 110819, Shenyang, Liaoning, China

    Yan Liu (Associate Professor), Zi-mu Zhang, Jun Zhang, Pin Shao & Ting-an Zhang

  2. Nagoya University Nagoya, 464-8603, Aichi Prefecture, Japan

    Sano Masamichi

Authors
  1. Yan Liu
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  2. Zi-mu Zhang
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  3. Sano Masamichi
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  4. Jun Zhang
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  5. Pin Shao
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  6. Ting-an Zhang
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Corresponding author

Correspondence to Yan Liu.

Additional information

Foundation Item: Item Sponsored by National Natural Science Foundation of China (50974035, 51074047); National High Technology Research and Development Program (863 Program) of China (2010AA03A405, 2012AA062303); Innovation Team Project of Provincial Science and Technology of Liaoning Province of China (LT2010034)

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Liu, Y., Zhang, Zm., Masamichi, S. et al. Improvement of Impeler Blade Structure for Gas Injection Refining under Mechanical Stirring. J. Iron Steel Res. Int. 21, 135–143 (2014). https://doi.org/10.1016/S1006-706X(14)60022-4

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60022-4

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