400t トーピードカーでのソーダ灰吹き込み脱りん処理中の諸現象(脱りん・脱硫 : ソーダ系スラグ)(<特集>溶銑処理の発展)

概要

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The new refining process which includes the desiliconization, dephosphorization and desulfurization was started at Kashima Steel Works in 1982. In this paper some phenomena during dephosphorization of hot metal by injection of soda ash in 400 t torpedo car are discussed. Followings are main results, (1) The phosphorus partition (P_2O_5)/[P] is larger than 1000 when the temperature is lower than 1250℃ and the basicity (Na_2O)/(SiO_2) is larger than 3. (2) The vaporization of Na injected increases rapidly when phosphorus content becomes lower than 0.040%. But this vaporization is suppressed by increasing of (SiO_2) content in slag and injection rate of soda ash and O_2 blowing onto hot metal. (3) It is effective for increasing of dephosphorization reaction and repressing of temperature drop of hot metal to blow oxygen onto hot metal during dephosphorization by soda ash. (4) The loss of phosphorus and sulfer into the gas phase is less than 5% respectively.
社団法人日本鉄鋼協会の論文
1983-11-01