“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
© 1994 Lloyd Robert Nelson, All rights reserved.
Dissertation - Restricted Access
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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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