Title

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

Abstract

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 (Us) 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 (D. < 20 cm2/s and D/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

TMS EPD Congress 1996 (1996: Feb. 4-9, Anaheim, CA)

Department(s)

Materials Science and Engineering

Comments

Sessions and symposia sponsored by the Extraction and Processing Division, General Pyrometallurgy Sessions

Keywords and Phrases

Countercurrent Processes; Flow Rate; Gas Injection; Heat Transfer; Laboratory Study; Mass Transfer; Mixing; Process Variables; Reaction Kinetics; Refining; Tracers; Metallurgy

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

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

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