酸化鉄含有スラグ-高炭素濃度溶鉄間反応におけるスラグの泡立ち現象

概要

論文の詳細を見る
Slag foaming was directly observed in a CaO-SiO_2-Al_2O_3-FeO slag and Fe-C alloy (C=4.5 mass%) system using a high temperature X-ray radiographic technique at 1773 K. The foaming behavior was characterized by measuring the index of foaming power <κ_1>, the foam life <τ>, the bubble diameter of CO gas <d_B>, the CO gas evolution rates during the observations and the wettability between the slag and metal. The results obtained in the present study were as follows : The index <κ_1> and the foam life <τ> were found to be almost constant during the observations, then the slag foaming behaviour in the system was described by Ito-Fruehan's equation. A small amount of sulphur addition to the system remarkably reduces the CO gas evolution rates. The sulphur addition increases bubble diameter <d_B>, which results in the reduction of <κ_1> and <τ>. Then the sulphur addition drastically reduces the slag foaming in this system. Therefore, the adjustment of sulfer concentration in the system is one of the most important points for controlling the slag foaming. Main cause for the increase in the bubble diameter <d_B> can be explained from the increase in the contact angle <θ> between slag and metal by the sulphur addition.
社団法人日本鉄鋼協会の論文
1992-11-01