Abstract
Recently, optimum control of mixing in current refining processes accompanied by bottom gas injection has become increasingly important because the metallurgical reactions in the bath proceed at different rates and in different sites with a lapse of time. The intensity of mixing is commonly represented by the mixing time T m [1-8]. Measuring the mixing time in the bath of real metallurgical reactors is difficult. Therefore, it is usually predicted on the basis of water model experiments using electric conductivity sensor and dilute aqueous KCl solution as tracer. The mixing time is known to be influenced by operating variables, such as the bath diameter D, bath depth H L, the location of bottom nozzle, and gas flow rate Q g [8]. However, only Q g can be easily controlled during processing. Even the effect of the gas flow rate Q g on the mixing time is relatively weak.
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References
Nakanishi K, Fujii T, Szekely J (1975) Possible relation between energy dissipation and agitation in steel processing operations, Ironmak Steelmak 2:193–197
Nakanishi K, Saito K, Nozaki T, Kato Y, Suzuki K, Emi T (1982) Physical and metallurgical characteristics of combined blowing processes, Proc Steelmak Conf 65:101
Asai S, Okamoto T, He JC, Muchi I (1983) Mixing time of refining vessels stirred by gas injection. Trans Iron Steel Inst Jpn 23:43–50
Sinha UP, McNallan MJ (1985) Mixing in ladles by vertical injection of gas and gas-particle jets-a water model study. Metall Trans 16B:850–853
Stapurewicz T, Themelis NJ (1987) Mixing and mass transfer phenomena in bottom-injected gas-liquid reactors, Can Metall Quart 26:123–128
Krishnamurthy GG, Mehrotra SP, Ghosh A (1988) Experimental investigation of mixing phenomena in a gas stirred liquid bath. Metall Trans 19B:839–850
Mietz J, Oeters F (1989) Flow field and mixing with eccentric gas stirring. Steel Res 60: 387–394
Mazumdar D, Guthrie RIL (1995) The physical and mathematical modelling of gas stirred ladle systems. Iron Steel Inst Jpn Int 35:1–20
Iguchi M, Hosohara S, Kondoh T, Itoh Y, Morita Z (1994) Effects of the swirl motion of bubbling jet on the transport phenomena in a bottom blown bath. Iron Steel Inst Jpn Int 34: 330–337
Iguchi M, Kondoh T, Uemura T (1994) Simultaneous measurement of liquid and bubble velocities in a cylindrical bath subject to centric bottom gas injection. Int J Multiphase Flow 20:753–762
Iguchi M, Ilegbusi OJ, Ueda H, Kuranaga T, Morita Z (1996) Water model experiment on the liquid flow behavior in a bottom blown bath with top layer. Metall Mater Trans B 27:35–41
Iguchi M, Hosohara S, Koga T, Yamaguchi R, Morita Z (1993) The swirl motion of vertical bubbling jet in a cylindrical vessel. Iron Steel Inst Jpn Int 33:1037–1044
Iguchi M, Nakamura K, Tsujino R (1998) Mixing time and fluid flow phenomena in liquids of varying kinematic viscosities agitated by bottom gas injection. Metall Mater Trans B 29: 569–575
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Iguchi, M., Ilegbusi, O.J. (2011). Surface Flow Control. In: Modeling Multiphase Materials Processes. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-7479-2_7
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DOI: https://doi.org/10.1007/978-1-4419-7479-2_7
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