Abstract
A constant volume technique was used to measure the rate of absorption of oxygen by liquid iron. The absorption process is found to proceed in two stages. When pure oxygen comes into contact with the surface of molten iron, an extremely rapid disappearance of oxygen from the gas phase accompanied by strong local super-heating of the melt at the gas/metal interface is observed. The rate of oxygen uptake during this stage is found to be dependent upon oxygen pressure and gas/metal interfacial area, but essentially independent of temperature, volume, and stirring conditions of the melt. The second phase commences after a few seconds with simultaneous cooling of the melt surface and the appearance at the gasmetal interface of a distinct third phase. The rate of absorption of oxygen during the second stage is markedly lower than the first stage. The presence of dissolved oxygen in the liquid iron has no influence on the absorption kinetics during either stage. A theoretical interpretation of the second stage is presented. A mechanism is proposed involving dissociative adsorption of oxygen molecules at the oxide/gas interface.
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Emi, T., Boorstein, W.M. & Pehlke, R.D. Absorption of gaseous oxygen by liquid iron. Metall Trans 5, 1959–1966 (1974). https://doi.org/10.1007/BF02644486
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DOI: https://doi.org/10.1007/BF02644486