Modelling of fluid flow and kinetics in counter-current reactors for pyrometallurgical refining
“Results of physical modelling and kinetic (mass transfer) simulation of a counter-current reaction launder (CCRL) for metals refining are presented. Physical modelling was conducted in a 200 cm long (L) by 20 cm wide (W) channel, using tetrachlorethylene to model 'metal' and water to model 'slag'. A thermal tracer technique was used to measure the eddy thermal diffusivity ( αe) and the interphase heat transfer coefficient (hov). The heat and mass transfer analogy was then applied to determine the extent of longitudinal mixing (De/uL) and to estimate the rate of interphase mass transport (kov). Liquid 'metal' height (H1) was kept constant at 20 cm, while the liquid 'slag' height (Hu) was varied between 5 and 18 cm. Nitrogen was bottom injected at a rate per unit area of 7.5 cm/min, through up to 16 central bubblers placed along the length of the CCRL. Low extents of longitudinal mixing in the 'metal' of De/uL less than 0.1 were measured. Interphase mass transfer coefficients of the order of 0.004 cm/s were estimated from the measured interphase heat transfer coefficient (hov = 1.3 to 2.0 kW/mK). Interphase heat transport was found to be a strong function of the gas stirring energy input (∈), according to hov ∞∈ 0.63, provided H1/W and H1/Hu met, or exceeded unity.
Kinetic simulation was applied to prediction of the performance of a novel CCRL process for production of low carbon ferromanganese (LC FeMn). A dimensionless (NCCRL)s = (kAp/m)s of 1.8 in the slag was predicted to yield highly refined LC FeMn (0.70 % Si), at a 97 % silicon utilization efficiency, and with a 89 % recovery of manganese to the alloy. A transitory reaction, tanks-in-series kinetic model was used to investigate nitrogen absorption and desorption. Substitution of argon for nitrogen was predicted to reduce the liquid LC FeMn nitrogen content from 0.98 to 0.025 % N, but at an estimated additional operating cost of about $10 /t LC FeMn”--Abstract, page iv.
Robertson, D. G. C.
Watson, John L.
Morris, Arthur E., 1935-
O'Keefe, T. J. (Thomas J.)
Medrow, Robert A.
Materials Science and Engineering
Ph. D. in Metallurgical Engineering
University of Missouri--Rolla
Journal article titles appearing in thesis/dissertation
- Thermodynamic and Kinetic Simulation of a Novel Counter-Current Reaction Launder Process for the Production of Refined Low Carbon Ferromanganese
- Kinetic Simulation of the Control of the Nitrogen Content of Low Carbon Ferromanganese in a Novel Counter-Current Reaction Launder (CCRL) Process
- Modeling of a Counter-Current Reaction Launder (CCRL) Process for Metal Refining
- Physical Modeling of Three-Phase Mixing in a Counter-Current Reaction Launder (CCRL) Process for Metal Refining
xxii, 230 pages
Note about bibliography
Includes bibliographical references.
© 1994 Lloyd Robert Nelson, All rights reserved.
Dissertation - Restricted Access
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Link to Catalog Record
Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b2763060~S5
Nelson, Lloyd R., "Modelling of fluid flow and kinetics in counter-current reactors for pyrometallurgical refining" (1994). Doctoral Dissertations. 1078.
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Support of this research by the Department of the Interior's Mineral Institute Program administered by the U.S. Bureau of Mines through the Generic Mineral Technology Center for Pyrometallurgy under Grant number G1125229 2927 is gratefully acknowledged.