鉄と鋼
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
ソーダ灰による溶銑処理における脱りん反応の解析
山田 健三碓井 務岩崎 克博小倉 英彦栗山 伸二山瀬 治
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ジャーナル オープンアクセス

1983 年 69 巻 15 号 p. 1841-1848

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抄録
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 1 600°C :
logK=(P2O5)/[P]2=1873/T[9.49+8.41log{(CaO)+2.32(Na2O)} - 4.78log(SiO2)] + 5logao+0.26[C] +
36 850/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.
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© 一般社団法人 日本鉄鋼協会

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