CaS飽和CaO-SiO_2-CaSスラグの成分活量とCaOの標準生成自由エネルギー

概要

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In order to develop the analysis of various pyro-metallurgical processes, thermodynamic properties related to CaO, the most important component of slag or flux, at 1,773 K were determined by conducting the following experiments： (1) Equilibration of molten copper with solid SiO2 under controlled oxygen partial pressure. (2) Equilibration of molten copper with the CaO-SiO2-CaS slag saturated with CaS in a CaS crucible. From the results of the experiment (1), the Raoultian activity coefficient of silicon at infinite dilution in molten copper at 1,773 K, was determined as： log = -1.45 (±0.03). Based on the results of experiment (2) and the previously determined value of , the activities of SiO2 and CaO in the CaO-SiO2-CaS slag saturated with CaS at 1,773 K were calculated by application of the Gibbs-Duhem integration techniques. And then, the standard free energy of formation of CaO at 1,773 K were determined to be： Ca(g) + 1/�2 O2(g) = CaO(s)：ΔG / �kJ·mol-1 = -430 (±10).
社団法人資源・素材学会の論文
1999-04-25