발간논문

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Vol.16, No.2, 80 ~ 90, 1978
Title
Reduction Kinetics of Synthetic Ilmenite by Graphite
강태욱Tai Ouk Kang, 윤종규Jong Kyu Yoon
Abstract
Reduction kinetics of mixtures of synthetic ilmenite(FeTiO₃) and graphite powder were investigated in the temperature range of 980℃ to 1100℃. Experiments were carried out with various graphite contents under N₂ and CO₂ atmosphere. DTA of the reaction were obtained simultanecusly with the measurement of the weight less. The unique initial rate of reduction of ilmenite was explained in terms of the solid-solid reduction between ilmenite-graphite and the later stage of the reduction was well applied to the Rao`s physicochemical model for reactions between solids through gaseous intermediates. The activation energy of reduction process being occurred mainly by gaseous intermediates was found to be 70.0±2 ㎉/㏖ and the temperature dependence of the specific rate constant, I₁, of Boudouard reaction which occurred simultaneously with the reduction of ilmenite was found to be given by I₁=0.640 exp(-12,360/RT) ㏖/atm-sec-gr. of graphite. Whereas, under atmosphere of CO₂ little reduction of ilmenite was found due to the infiltration of CO₂ into pellet from atmosphere.
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