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| KINETICS OF THE REACTIONS BETWEEN LIQUID SLAGS AND CARBON-SATURATED IRON |
| WANG WEI-YUAN(Institute of Metallurgy; Academia Sinica) |
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Cite this article:
WANG WEI-YUAN(Institute of Metallurgy; Academia Sinica). KINETICS OF THE REACTIONS BETWEEN LIQUID SLAGS AND CARBON-SATURATED IRON. Acta Metall Sin, 1964, 7(4): 376-382.
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Abstract An investigation of the kinetics of the reactions between liquid slags and carbonsaturated iron including the reduction of FeO, MnO, CrO and V_2O_3 by carbon and the desulphurization of iron leads to the conclusion that the chemical reactions come to equilibrium rapidly at the slag-metal interface, while the controlling step is convective diffusion. It has been found that the reactions are of the first order when the melt is kept in a rotational motion, caused by the use of a rotating crucible or stirrer, and are of second order when the melt is kept in a stationary crucible and stirred by CO gas bubbles only. The thickness of the diffusion boundary layer δ, obtained from a treatment of Chipman's desulphurization data and Philbrook's data on the reduction of FeO, which correspond to the two fore-mentioned cases respectively, has been found to be inversely propertional to ω~(1/2), the square root of the angular velocity, and C_(FeO), the concentration of FeO in the slag phase.The present problem has been treated on the basis of the principle of convective diffusion across a solid-liquid interface according to Levich. It has been found that our findings can be satisfactorily explained by an application of this principle. An exceptional case is the reduction of SiO_2 from slags, which is probably controlled by interfacial chemical reaction.
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Received: 18 April 1964
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