The Effect of High Gas Flowrates on the Performance of a Counter-Current Reaction Launder (CCRL) Process for Metal Refining


Experimental results of 3-phase mixing in a physical model of a CCRL for metals refining, at high levels of bottom gas injection (up to a superficial gas velocity (Ug) of 12.5 cm/min), are presented. A thermal tracer technique was used to elucidate both longitudinal mixing and interphase heat transfer. The results indicate that even under conditions of significant bottom gas injection, it should be possible to maintain acceptably low longitudinal mixing (De < 20 cm2/s and De/uL < 0.1) in the CCRL. Interphase mass-transfer coefficients of the order of 0.02 cm/s and higher, are predicted from the measured interphase heat transfer coefficients using the mass and heat transfer analogy. Adequate performance is likely to be possible for an industrial CCRL, based on extrapolation of these results to full-scale conditions.

Meeting Name

125th TMS Annual Meeting (1996: Feb. 4-8. Anaheim, CA)


Materials Science and Engineering

Keywords and Phrases

Countercurrent reaction launder process; Gas injection; Mass transfer coefficient; Thermal tracer technique; Three phase mixing; Flow of fluids; Heat transfer; Heat transfer coefficients; Mixing; Models; Thermal variables measurement; Metal refining

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Document Type

Article - Conference proceedings

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© 1996 The Minerals, Metals & Materials Society (TMS) , All rights reserved.

Publication Date

01 Feb 1996

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