CaO-CaF_2-SiO_2 フラックスの炭酸ガス溶解度

概要

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The solubility of carbon dioxide has been measured by the thermogravimetric technique for CaO-CaF_2-SiO_2 molten fluxes at temperatures from 1200 to 1500℃. The values of carbonate capacity (C_C=wt%CO_3^<2->/P_<CO_2>) were calculated by the solubilities and the partial pressure of carbon dioxide. Carbonate capacities were compared with the sulfide capacities appearing in the literature. A linear relationship was obtained for C_<S^<2->> and C_C as log C_<S^<2->>=1.1log C_C-3.3 at 1200℃. With increasing CaF_2 from 29.0 to 88.2wt% at constant X_<CaO>/X_<SiO_2> of three at 1400℃, C_C increased from 0.53 to 0.89. The influence of the replacement of CaO by CaF_2 on C_C at various SiO_2 content has been investigated. With increasing CaF_2, C_C decreased for fluxes of X_<CaO>/X_<SiO_2> smaller than three, while it increased for fluxes with a ratio larger than three. Carbonate capacities of slags of X_<CaO>/X_<CaF_2>=1.56 decreased with increasing SiO_2 content from 8.3 to 25wt%. In fluxes of which the ratio was 0.68, C_C decreased with an increase of SiO_2 more than 5wt%. There was a maximum of C_C at 0.8wt%SiO_2 for the fluxes of a ratio of 0.14.
社団法人日本鉄鋼協会の論文
1991-02-01