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Desiliconization, Desulfurization and [Mn] Increase of Hot Metal with CaO-MnO-CaF2 Flux

Masahito Hanao, Tohru Matsuo

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Abstract

Experiments were conducted on the hot metal treatment by adding CaO-MnO-CaF2 flux to 2kg carbon-saturated iron at 1350°C.(1) By adding CaO-MnO-CaF2 flux, desiliconization, desulfurization and [Mn] increase of carbon-saturated iron occurred simultaneously.(2) From the equilibrium oxygen partial pressure determined by [Si]-(SiO2) and that by [Mn] (MnO), the reaction: [Si]+2 (MnO)=2[Mn]+(SiO2) is considered to have almost reached equilibrium state.(3) By comparing Ls (=(%S)/[%S]) observed and that calculated using the numerical values of the sulfide capacity of CaO-SiO2-CaF2 slag and the equilibrium oxygen partial pressure, desulfurization is also considered to be in equilibrium state.

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Experiments were conducted on the hot metal treatment by adding CaO-MnO-CaF2 flux to 2kg carbon-saturated iron at 1350°C.(1) By adding CaO-MnO-CaF2 flux, desiliconization, desulfurization and [Mn] increase of carbon-saturated iron occurred simultaneously.(2) From the equilibrium oxygen partial pressure determined by [Si]-(SiO2) and that by [Mn] (MnO), the reaction: [Si]+2 (MnO)=2[Mn]+(SiO2) is considered to have almost reached equilibrium state.(3) By comparing Ls (=(%S)/[%S]) observed and that calculated using the numerical values of the sulfide capacity of CaO-SiO2-CaF2 slag and the equilibrium oxygen partial pressure, desulfurization is also considered to be in equilibrium state.

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Available abstract

Experiments were conducted on the hot metal treatment by adding CaO-MnO-CaF2 flux to 2kg carbon-saturated iron at 1350°C.(1) By adding CaO-MnO-CaF2 flux, desiliconization, desulfurization and [Mn] increase of carbon-saturated iron occurred simultaneously.(2) From the equilibrium oxygen partial pressure determined by [Si]-(SiO2) and that by [Mn] (MnO), the reaction: [Si]+2 (MnO)=2[Mn]+(SiO2) is considered to have almost reached equilibrium state.(3) By comparing Ls (=(%S)/[%S]) observed and that calculated using the numerical values of the sulfide capacity of CaO-SiO2-CaF2 slag and the equilibrium oxygen partial pressure, desulfurization is also considered to be in equilibrium state.

Key concepts: Flue-gas desulfurization, Partial pressure, Flux (metallurgy), Sulfide, Oxygen, Thermodynamic equilibrium, Metal, Slag (welding)

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