CaO-SiO_2 二元鉱滓の CaO の活量について : 熔鉱炉系鉱滓の石灰分活量 I

概要

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The e. m. f. measurement of double cells was applied in order to determine directly the activity of CaO in CaO-SiO_2 slags at 1, 600℃. The electrodes used in the cell were of two tungsten rods, which had been treated in a molten slag bath by passage of direct current as cathodes and confirmed to be capable of using for a calcium electrode by electrode potential measurement, spectroanalysis and X-ray diffraction. The e. m. f. of eight CaO-SiO_2 slags against a reference slag and the e. m. f. of one of them against the CaO-Al_2O_3 molten slag coexisting with solid lime were measured at 1, 600℃. From these observed values the activities of CaO at 1, 600℃ relative to solid lime were calculated. The activity of SiO_2 in the system was also found from that of CaO relative to solid silica by means of the Gibbs-Duhem relation. Even a small amount of the sulfur in slags lowered very rapidly the activity of CaO in them.
社団法人日本鉄鋼協会の論文
1961-12-01