<報文>落下型熱量計によるPb-S系融体の熱力学的研究

概要

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Thermodynamic data on the liquid Pb-S system are indispensable for establishing quantitative equilibrium models for direct smelting of PbS concentrates to Pb. A drop-calorimeter was used to measure the heat content of the Pb-S binary system in the composition range of sulfur , Ns=0 to 0.5 (PbS) and in the temperature range of 560 to 1500 K, and a heat content-temperature-composition ternary diagram was constructed. The method of quantitative thermal analysis was applied to calculate the thermodynamic quantities such as the activities of Pb and PbS, p_<S_2> and the heat and entropy of mixing in the liquid Pb-S binary system and the liquid Pb-PbS quasi-binary system. The obtained values for a_<Pb>, p_<S_2> and the heat of mixing are considerably different from the ones estimated by using a regular solution model. Based on the obtained thermodynamic data, a sulfur-oxygen potential diagram was constructed for the Pb-S-O system at 1473 K, and the equilibrium vapor pressures of different gas species which contain Pb were calculated in relation to the sulfur content.
東北大学の論文
1983-10-15