발간논문

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Vol.36, No.3, 448 ~ 454, 1998
Title
Thermodynamic behaviors of carbon dissolution in CaO-SiO2 based slags
송효석 , 김동식 , 이창희 , 민동준 H . S . Song , D . S . Kim , C . H . Rhee , D . J . Min
Abstract
The experiments have been carried out to understand the thermodynamic dissolving behaviors of carbon into slags at high temperature. Carbon is dissolved as carbide under highly reducing atmosphere in CaO-SiO₂ as well as CaO-SiO₂-CaF₂ slags. Carbide solubility in CaO-SiO₂-CaF₂ slag decreased with the oxygen potential with theoretical relationship of (-½), which implied a reaction mechanism of ion exchange between carbon and oxygen ion. The dependence of carbide solubility in slag on slag basicity, measured far various slag systems appeared to confirm this mechanism. This reaction mechanism is feasible if carbide dissolution proceeded by reaction between solid carbon and oxygen ion supplied from (CaO) in slag which would be influenced by slag components and temperature as shown in capacity concepts. Substitution of CaO by MgO decreased the solubility of carbide in CaO-SiO₂-MgO slag due to the relatively low electronegativity of (MgO).
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