Determination of Desulphurising Ability for Ca–CaF2 Flux Using Equilibration with Molten Silver at 1673 K in Closed Graphite Crucibles
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概要
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The present study aims to evaluate the desulphurising ability of Ca–CaF2 flux. Desulphurisation equilibrium between molten CaS–CaF2 flux and molten silver has been investigated using a crucible covered with a cap having a capillary. The relationship between calcium and sulphur concentrations in molten silver has been clarified for CaS saturated and unsaturated systems. Two thermodynamic properties have been determined, namely, the equilibrium constant for the dissolution reaction of CaS into molten silver and the activity coefficient product of calcium and sulphur in molten silver from the data for CaS saturated system, as follows:CaS(s) = Ca(mass% in Ag) + S(mass% in Ag)logK = –6.38log(fCafS) = –87.3(±12.3)√C (C < 0.032)C = [%Ca]/MCa + [%S]/MSThe activity coefficient of CaS in CaS–CaF2 flux has been obtained as a function of CaS mole fraction in flux from the data for CaS unsaturated system:logγCaS = 2.67(1–XCaS)2–1.26 (XCaS < 0.12)Combination of these thermodynamic data leads to the distribution ratio of sulphur between molten Ca–CaF2 flux and molten SUS316L stainless steel, 4.7×106 at 1673 K. This value is extremely higher than that in conventional refining, indicating that metallic calcium based fluxes have extraordinary desulphurising ability.
著者
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Kobayashi Yoshinao
Department Of Gastroenterology And Hepatology Division Of Clinical Medicine And Biomedical Science I
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Susa Masahiro
Department Of Metallurgical Engineering Tokyo Institute Of Technology
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Tanigawa Hiroya
Graduate Student, Tokyo Institute of Technology
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Susa Masahiro
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology
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