石灰系フラックスと酸化鉄による低珪素溶銑のインジェクション脱りん(脱りん・脱硫 : 石灰系スラグ)(<特集>溶銑処理の発展)

概要

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Dephosphorization by injecting lime-based fluxes and iron oxides into hot metal has been investigated extensively including water model test. The followings have been obtained through thermodynamic, kinetic and fluid dynamic studies. (1) The dephosphorization behavior can be divided consistently in terms of consumption of dephosphorization reagent or oxygen supplied into three stages which are controlled by silicon content in metal, basicity of slag and so forth. The three stages are characterized as stagnant stage, proceeding stage and retarding stage in dephosphorization. (2) The equation of dephosphorization reaction between molten iron and slag at temperatures of 1200 to 1400℃ can be expressed by the conventional method available in LD process on the basis of stoichiometric reaction equation. (3) A dynamic model considering both transitory reaction and permanent reaction is proposed to explain the dephosphorization behavior to quite a good agreement with experimental data based on mass-balance during oxidizing process. This has made it clear that the three stages are controlled by rate-determining factors such as basicity, silicon content, consumption of oxygen and phosphorus distribution ratio between slag and metal.
社団法人日本鉄鋼協会の論文
1983-11-01