Physical Modeling of Three-phase Mixing in a Counter-current Reaction Launder(CCRL) Process for Metal Refining
Nelson, Lloyd R.
Experimental results of three-phase mixing in a physical model of a CCRL for metals refining are presented. The system was operated above a critical lower liquid height-to- width ratio (H,/W) of unity, with adequate bottom gas injection through a line of central, single tuyeres (Q,/A = 7.5 cm/min, or c = 17 W/m3) to sustain levels of interphase transport considered appropriate to an industrial pyrometallurgical refining operation. The application of a thermal tracer technique to elucidate both longitudinal mixing and interphase heat transfer is discussed. The results indicate that even under conditions of significant bottom gas injection, it should be possible to maintain acceptably low longitudinal mixing 1 (D, < 20 cm /s and D,/uL < 0.1) in the CCRL. Interphase mass transfer coefficients of the order of 0.004 cm/s are predicted from the measured interphase heat transfer coefficients (h = 1.3 to 2.0 kW/m2K), using the heat and mass transfer analogy. Adequate rates of rehning are predicted for an industrial CCRL operated under such conditions.
L. R. Nelson et al., "Physical Modeling of Three-phase Mixing in a Counter-current Reaction Launder(CCRL) Process for Metal Refining," EPD Congress 1995 Proceedings, The Minerals, Metals & Materials Society (TMS), Jan 1995.
EPD Congress 1995
Materials Science and Engineering
Article - Conference proceedings
© 1995 The Minerals, Metals & Materials Society (TMS) , All rights reserved.
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