CaO 坩堝による溶鉄と溶融鉄合金のカルシウム脱酸およびアルミニウム脱硫

概要

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Using a lime crucible and an induction furnace in vacuum as well as at pressure, a study was made to clarify the deoxidation and the desulphurization processes of liquid iron and iron-base alloys by iron clad calcium or aluminium alone. The experimental results are summarized as follows. (1) Calcium addition to liquid iron in a magnesia or alumina crucible greatly influenced the rate of deoxidation and the deoxidizing power owing to the reaction of the crucible material with calcium. (2) The CaO-FeO oxide which was formed for liquid iron in a lime crucible immediately after the calcium addition seemed to grow and to be separated from the melt with time. (3) At 1600℃ in 1 atm argon, the concentration of calcium dissolved in liquid iron was estimated to be 0.024wt pct. The equilibrium constants were calculated as follows. log K_<ca>=log a_<ca>・a_o=-8.23 and K′_<ca>=[%Ca]×[%O]=2.16×10^<-6>. (4) It is presumed that the aluminium desulphurization of liquid iron in a lime crucible is caused by the formation of highly basic reaction product layer such as 3CaO・Al_2O_3 on the surface of the crucible.
社団法人日本鉄鋼協会の論文
1975-07-01