Abstract
A study was made on the rate of nitrogen desorption from molten iron by Ar injection. Argon was injected into the melt through a submerged alumina nozzle of 0.1cm in ID. and 0.3cm in O.D. The immersion depth of the nozzle was 4.6-5.2cm. The gas flow rate was in the range of 74-96Ncm3/min. The oxygen content in the melt was varied as 0.004-0.066%. During the experiment, the bubble formation time was measured by a pressure pulse technique.The measured desorption rates are compared with those calculated by a mixed control model derived by considering that the mass transfers in both liquid and gas phases and the chemical reaction at the bubble-metal interface are the rate controlling steps. Nitrogen desorption during the bubble formation is taken into account in the model. From comparison between calculation and experiment, the chemical reaction rate constant is determined. It is shown that the chemical reaction rate constant decreases with increasing [%O]+[%S]/2. The rate constant obtained in the present study agrees with that obtained in the previous study on nitrogen absorption in molten iron. It is confirmed that both nitrogen absorption and desorption in molten iron could be explained by the mixed control model.
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