JP2019116668A - 上底吹き転炉の操業方法 - Google Patents
上底吹き転炉の操業方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 32
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 82
- 238000007664 blowing Methods 0.000 claims description 78
- 239000007789 gas Substances 0.000 claims description 42
- 229910052742 iron Inorganic materials 0.000 claims description 41
- 239000002893 slag Substances 0.000 claims description 37
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- 235000011941 Tilia x europaea Nutrition 0.000 claims description 17
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- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
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- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 21
- 229910001882 dioxygen Inorganic materials 0.000 description 21
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 20
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 15
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Abstract
Description
前記転炉は、前記略円柱の下面と前記逆円錐台の上面との共通する炉内径D1(m)と、前記逆円錐台の下面である転炉の炉底径D2(m)との比D1/D2が1.5〜2.5の範囲である炉体形状の転炉とし、
該転炉による上底吹きの操業条件が、溶銑に供給される酸化性ガスの総流量QO2(Nm3/min/t)と、上吹きガス流量Qt(Nm3/min/t)と、底吹きガス流量Qb(Nm3/min/t)とが下記数式1の関係を満たすことを特徴とする上底吹き転炉の操業方法である。
(1)上吹きランスから酸化性ガスを吹き付けるとともに、炉底部に設けた底吹き羽口から撹拌用不活性ガスを吹き込むこと、
(2)上吹きランスから石灰系媒溶剤を吹き付けることにより、スラグ塩基度(mass%CaO/mass%SiO2)(以下、「mass%」は「%」として表記する)を2.4〜3.6に調整すること、
がより好ましい実施形態になりうるものと考えられる。
2 上吹きランス
3 転炉炉体
4 鉄皮
5 炉壁耐火物
6 出湯口
7 ガス導入管
8 底吹き羽口
9 溶鉄
10 スラグ
11 上吹き酸素ガス
12 底吹きガス気泡
13 石灰系媒溶剤
Claims (3)
- 静置直立した状態において略円柱および逆円錐台を組合せた炉体形状をもつ転炉を用いて、高炉から出銑した溶銑あるいは高炉から出銑した後に予め脱燐処理を施した溶銑を精錬する上底吹き転炉の操業方法であって、
前記転炉は、前記略円柱の下面と前記逆円錐台の上面との共通する炉内径D1(m)と、前記逆円錐台の下面である転炉の炉底径D2(m)との比D1/D2が1.5〜2.5の範囲である炉体形状の転炉とし、
該転炉による上底吹きの操業条件が、溶銑に供給される酸化性ガスの総流量QO2(Nm3/min/t)と、上吹きガス流量Qt(Nm3/min/t)と、底吹きガス流量Qb(Nm3/min/t)とが下記数式1の関係を満たすことを特徴とする上底吹き転炉の操業方法。
[式1]
- 上吹きランスから酸化性ガスを吹き付けるとともに、炉底部に設けた底吹き羽口から撹拌用不活性ガスを吹き込むことを特徴とする請求項1に記載の上底吹き転炉の操業方法。
- 上吹きランスから石灰系媒溶剤を吹き付けることにより、スラグ塩基度(%CaO/%SiO2)を2.4〜3.6に調整することを特徴とする請求項1または2に記載の上底吹き転炉の操業方法。
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