マンガンによる脱硫生成物について : マンガンによる熔銑の脱硫に関する研究 III

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In a discussion of the foregoing work, the desulphurization product by manganese was assumed to be probably Mn-sulphide (Tetsu-to-Hagane Vol.43, 1957, pp.517∿535). However, it seemed doubtful in lower manganese range especially at higher temperature. This paper describes the experimental results of the relations between the composition of desulphurization product and the Mn-S equilibrium in C-saturated iron melts. The desulphurization product was a sulphide slag which was produced by mixing the liquid FeS and Fe-C-Mn melts at that temperature and brought into equilibrium with C-saturated iron melts. The results were as follows : 1) The main components of the slag were Mn, Fe and S, and the manganese content in the slag increased with the manganese in the metal and attained constant at above 3% Mn in the metal. 2) From the Norelco X ray analysis, it was assumed that the slags were solutions of FeS or Fe-FeS dissolved into MnS. 3) Considering the manganese in the slag was entirely combined with sulphur, the MnS pct in the slag was found to be constant above 3% Mn in the metal. This value was about 94%. MnS. 4) Regarding the slag as FeS-MnS solution and referring to the FeS-MnS diagram, the activity of MnS might be equal to concentration, which was expressed in terms of mol fraction N_<MnS>. The authors could write the equilibrium constant K=N_<MnS>/α_S・α_<Mn>=0.428 at 1500℃. From this value the apparent equilibrium constant K″=[Mn%]・[S%] in lower manganese range was discussed.
社団法人日本鉄鋼協会の論文
1959-01-01

マンガンによる脱硫生成物について : マンガンによる熔銑の脱硫に関する研究 III

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