Abstract
The large-scale mechanically agitated tank has been widely used in the decomposition process of sodium aluminate solution in the alumina industry. The mixing process in three types of seed precipitation tanks (Robin, Ekato, and improved Ekato) stirred with multiple impellers was compared by using computational fluid dynamics, respectively. The flow field, solid distribution, mixing time, and power consumption were numerically simulated by adopting a Eulerian granular multiphase model and a standard k-ε turbulence model. A steady multiple reference frame approach was used to represent impeller rotation. Compared with the Robin tank, the Ekato tank can generate an axial circulation loop, which is better for fluid mixing and solid suspension; meanwhile about half of the power can be saved. With future improvements in the Ekato tank, the fluid mixing and exchanging can be enhanced under the interaction of a lengthened Intermig impeller coupled with sloped baffles. With a little increase in power consumption, the maximum of the relative solid concentration difference in the whole tank can be maintained within 3%, which meets the design requirement.
Similar content being viewed by others
References
Q.P. Chen, H.J. Yan, S.G. Ge, and J.M. Zhou, Trans. Nonferrous Met. Soc. China 21, 1680 (2011).
Y.F. Ding, X.D. Su, D.Q. Hu, L. He, and F. Wang, Appl. Mech. Mater. 331, 16 (2013).
E.S. Szalai, P. Arratia, K. Johnson, and F.J. Muzzio, Chem. Eng. Sci. 59, 3793 (2004).
J. Aubin and C. Xuereb, Chem. Eng. Sci. 51, 2913 (2006).
G. Montante, Chem. Eng. Res. Des. 79, 1006 (2007).
T.A. Zhang, Y. Liu, S.C. Wang, H.L. Zhao, C. Zhang, Q.Y. Zhao, G.Z. Lv, and Z.H. Dou, Light Metals, ed. S.J. Lindsay (John Wiley & Sons Inc., New Jersey, 2011), pp. 145–150
Y. Liu, H.L. Zhao, T.A. Zhang, Q.Y. Zhao, S.C. Wang, S.Q. Gu, J.H. He, and C. Zhang, Light Metals, ed. C.E. Suarez (John Wiley & Sons Inc., New Jersey, 2012), pp. 113–117
ANSYS Inc., ANSYS FLUENT 12.0 Theory Guide, 2009, pp. 16-41.
B.E. Launder and D.B. Spalding, Lectures in Mathematical Models of Turbulence (London: Academic Press, 1972).
D. Gidaspow, R. Bezburuah, J. Ding, in Proceedings of the 7th Engineering Foundation Conference on Fluidization, eds. O.E. Potter, D.J. Nicklin (Engineering Foundation, New York, 1992), pp. 75–82.
J.V. Luo, R.I. Issa, and A.D. Gosman, IchemE. Symp. Ser. 136, 549 (1994).
X.G. Shan, G.Z. Yu, C. Yang, Z.S. Mao, and W.G. Zhang, Ind. Eng. Chem. Res. 47, 2926 (2008).
L.C. Wang, Y.F. Zhang, X.G. Li, and Y. Zhang, Chem. Eng. Sci. 65, 5559 (2010).
J. Min, Z.M. Gao, and L.T. Shi, Chin. J. Chem. Eng. 13, 583 (2005).
Y. Zhang, C.X. Han, D.L. Zhou, and S.Q. Feng, Non-ferrous Metall. Equip. 3, 8 (2003).
Acknowledgements
This research was supported by the National Natural Science Foundation of China (No. 50974035); National Natural Science Foundation of China (No. 51074047); High Technology Research and Development Program of China (2010AA03A405); and Innovation Team Project of the Provincial Science and Technology (LT2010034).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zhao, HL., Liu, Y., Zhang, TA. et al. Computational Fluid Dynamics (CFD) Simulations on Multiphase Flow in Mechanically Agitated Seed Precipitation Tank. JOM 66, 1218–1226 (2014). https://doi.org/10.1007/s11837-014-1012-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11837-014-1012-1