黒鉛共存下における溶融スラグ中チタンの熱力学

概要

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The equilibrium concentrations of Ti^<3+> and Ti^<4+> in the molten CaO-SiO_2-Al_2O_3-MgO system with TiC, C and atmospheric CO were determined in the temperature ranging from 1400° to 1550℃ in order to clarify the mechanism of the formation of titanium carbonitride at the hearth of a blast furnace. The γTiO_<1.5> and γTiO_2 values were calculated from the determined concentrations as well. The Ti^<4+> ion in slags is found to behave amphoterically with the critical CaO/SiO_2 equal to unity. The Ti^<3+> ion behaves basic except in highly basic slags such as in the CaO-Al_2O_3 system, where it turns out to behave acidic. It is indicated by the thermodynamic calculation including the data of the present work that the actual blast furnace slag contains titanium abundantly enough to form Ti(CN). In view of the sluggish formation of TiC from slags and graphite, the protective titanium bear on the hearth is likely to form on the reaction in which hot metals take part.
社団法人日本鉄鋼協会の論文
1981-10-01