溶融錫一鉄合金の活量測定
錫製錬に関する基礎的研究 (第2報)
1969 年 85 巻 969 号 p. 39-42
詳細
1969 年 85 巻 969 号 p. 39-42
The distribution of tin between liquid lead and iron was studiedat temperatures from 1, 350°C to 1, 500°C. Molten Sn-Fe alloy containing more than 70 at % Fe equilibrates with molten Sn-Pb alloy of which activities can be derived from the results of the 1st report. Because the dissolution of iron can not be ignored in Sn-Pb layer rich in tin, activities were determined in homogeneous Sn-Pb-Fe alloy by transportation method; thus, the reliable values of activity of tin were derived for Sn-Fe alloy. Activities of tin and iron thus obtained exhibit considerable positive deviations from Raoult's law, and activity coefficients of tin and iron at the infinite dilute solutions, γnSn and γnFe, were determined to be 6.4 and 8.4, respectiyely. The actiyities obtained experimentally agree quitewell with those calculated based upon Lumsden's model using miscibility gap suggested by Hansen. The problems of slag loss and refining of metal in tin smelting were discussed using the obtained results.
