ソーダ灰による溶銑処理における脱りん反応の解析(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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A new process for the hot metal dephosphorization is examined. It is done in the 200 t hot metal ladle, soda ash being top charged, oxygen gas being top blown and nitrogen gas being injected through a submerged lance. Dephosphorization reaction is analyzed in terms of its reaction equilibrium and stirring intensity or energy involved. Equation for the dephosphorization equilibrium is established by the extrapolation of the laboratory data at 1600℃ : log(K=(P_2O_5)/[P]^2=1873/T[9.49+8.41log{(CaO)+2.32(Na_2O)}-4.78log(SiO_2)]+5logα_o+0.26[C]+36850/T-25.32 This equation is found to well describe the hot metal dephosphorization all through the treatment. Thus, the reaction is found to proceed very close to the equilibrium. The effect of the oxygen blow and the stirring upon the dephosphorization is clearly demonstrated. The optimum stirring energy is found to exist for the maximum dephosphorization attainment : between 0.6 to 1.5 MJ/t.
社団法人日本鉄鋼協会の論文
1983-11-01