JP6760237B2 - 溶銑の脱珪処理方法 - Google Patents
溶銑の脱珪処理方法 Download PDFInfo
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- JP6760237B2 JP6760237B2 JP2017185838A JP2017185838A JP6760237B2 JP 6760237 B2 JP6760237 B2 JP 6760237B2 JP 2017185838 A JP2017185838 A JP 2017185838A JP 2017185838 A JP2017185838 A JP 2017185838A JP 6760237 B2 JP6760237 B2 JP 6760237B2
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- 239000002184 metal Substances 0.000 title claims description 182
- 229910052751 metal Inorganic materials 0.000 title claims description 182
- 238000000034 method Methods 0.000 title claims description 38
- 239000007789 gas Substances 0.000 claims description 85
- 239000001301 oxygen Substances 0.000 claims description 80
- 229910052760 oxygen Inorganic materials 0.000 claims description 80
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 79
- 239000003795 chemical substances by application Substances 0.000 claims description 74
- 238000007670 refining Methods 0.000 claims description 73
- 239000002893 slag Substances 0.000 claims description 70
- 238000011282 treatment Methods 0.000 claims description 64
- 238000007654 immersion Methods 0.000 claims description 62
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 56
- 229910001882 dioxygen Inorganic materials 0.000 claims description 56
- 238000006243 chemical reaction Methods 0.000 claims description 44
- 239000000843 powder Substances 0.000 claims description 44
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 43
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 35
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 30
- 238000007664 blowing Methods 0.000 claims description 30
- 229910052710 silicon Inorganic materials 0.000 claims description 20
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 18
- 239000010703 silicon Substances 0.000 claims description 18
- 239000000377 silicon dioxide Substances 0.000 claims description 15
- 235000012239 silicon dioxide Nutrition 0.000 claims description 15
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 12
- 239000004215 Carbon black (E152) Substances 0.000 claims description 8
- 229930195733 hydrocarbon Natural products 0.000 claims description 8
- 150000002430 hydrocarbons Chemical class 0.000 claims description 8
- 238000005261 decarburization Methods 0.000 claims description 7
- 229910052681 coesite Inorganic materials 0.000 claims description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims description 6
- 229910052682 stishovite Inorganic materials 0.000 claims description 6
- 229910052905 tridymite Inorganic materials 0.000 claims description 6
- 239000011247 coating layer Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 54
- 239000000292 calcium oxide Substances 0.000 description 27
- 235000012255 calcium oxide Nutrition 0.000 description 27
- 230000001965 increasing effect Effects 0.000 description 19
- 239000002253 acid Substances 0.000 description 17
- 235000013980 iron oxide Nutrition 0.000 description 17
- 229910052742 iron Inorganic materials 0.000 description 14
- 239000002904 solvent Substances 0.000 description 11
- 230000007423 decrease Effects 0.000 description 10
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 8
- 238000007667 floating Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 229910052698 phosphorus Inorganic materials 0.000 description 7
- 239000011574 phosphorus Substances 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000007598 dipping method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000001294 propane Substances 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000030609 dephosphorylation Effects 0.000 description 1
- 238000006209 dephosphorylation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011823 monolithic refractory Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910001392 phosphorus oxide Inorganic materials 0.000 description 1
- LFGREXWGYUGZLY-UHFFFAOYSA-N phosphoryl Chemical class [P]=O LFGREXWGYUGZLY-UHFFFAOYSA-N 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
[1]耐火物被覆層を有する浸漬ランスを反応容器に収容された溶銑に略鉛直に浸漬し、前記浸漬ランスの側面に設けた多重管構造の吐出ノズルから、酸素含有ガス、粉状精錬剤、及び、前記酸素含有ガスの吐出ノズルを外周側から冷却するための炭化水素系ガスを前記溶銑に吹き込み、前記溶銑に含有される珪素を酸化して除去する溶銑の脱珪処理方法において、
前記粉状精錬剤が粉状の転炉脱炭スラグを含み、
前記酸素含有ガスに含まれる酸素ガスの溶銑1トンあたりの供給速度を0.05〜0.25Nm3/(min・t)とし、
前記粉状精錬剤の溶銑1トンあたりの吹き込み速度を0.20〜1.00kg/(min・t)とし、
前記粉状精錬剤に含まれるCaOの溶銑1トンあたりの供給速度A(kg/(min・t))と、下記の(1)式及び(2)式によって定義される、脱珪処理で生成する酸化物融体における二酸化珪素生成速度B(kg/(min・t))との比A/Bを0.70以上、1.10以下として、
前記酸素含有ガスとともに前記粉状精錬剤を前記溶銑に吹き込むことを特徴とする、溶銑の脱珪処理方法。
B=CSiO2×Rf+(Fo+Co×Rf×0.7)×2.68×ηo …(1)
ηo=0.85−0.65×e−Rf/6Fo …(2)
ここで、CSiO2は粉状精錬剤中のSiO2の含有質量比率(−)、Rfは溶銑1トンあたりの粉状精錬剤の供給速度(kg/(min・t))、Foは溶銑1トンあたりの酸素含有ガス中の酸素ガスの供給速度(Nm3/(min・t))、Coは粉状精錬剤中の酸化鉄に含まれる酸素の粉状精錬剤に対する質量比率(−)、ηoは推定脱珪酸素効率(−)である。
(1)溶銑中に吹き込む酸素ガスなどによる反応生成ガスの浮上領域が開口部の直下に位置すること。
(2)反応生成ガスの浮上領域が狭く、単位面積、単位時間あたりの通過ガス量が大きいこと。
(3)反応生成ガスの浮上過程で浮上領域が一体化して混銑車の長手方向に直交する方向の浴振動モードが顕著となること。
ηo=0.85−0.65×e−Rf/6Fo …(2)
ここで、CSiO2は粉状精錬剤中のSiO2の含有質量比率(−)、Rfは溶銑7の1トンあたりの粉状精錬剤の供給速度(kg/(min・t))、Foは溶銑7の1トンあたりの酸素含有ガス中の酸素ガスの供給速度(Nm3/(min・t))、Coは粉状精錬剤中の酸化鉄に含まれる酸素の粉状精錬剤に対する質量比率(−)、ηoは推定脱珪酸素効率(−)である。尚、通常の転炉脱炭スラグの場合、スラグ中のT.Feに占めるFe3+の質量比率は0.2程度であるので、Coはスラグ中のT.Feの質量比率の0.34倍(16×1.2/56≒0.34)として求めてもよい。T.Feとは、スラグ中の全ての鉄酸化物の鉄分の合計値である。
2 内管
3 外管
4 耐火物被覆層
5 吐出ノズル
6 混銑車
7 溶銑
8 合流部
9 粉状精錬剤供給配管
10 酸素含有ガス供給配管
11 炭化水素系ガス供給配管
12 開口部
Claims (1)
- 耐火物被覆層を有する浸漬ランスを反応容器に収容された溶銑に鉛直に浸漬し、前記浸漬ランスの側面に設けた多重管構造の吐出ノズルから、酸素含有ガス、粉状精錬剤、及び、前記酸素含有ガスの吐出ノズルを外周側から冷却するための炭化水素系ガスを前記溶銑に吹き込み、前記溶銑に含有される珪素を酸化して除去する溶銑の脱珪処理方法において、
前記粉状精錬剤が、CaO成分が30質量%以上で、且つ、酸化鉄は、FeO+Fe 2 O 3 の成分和が30質量%以下である成分の、粉状の転炉脱炭スラグを含み、
前記酸素含有ガスに含まれる酸素ガスの溶銑1トンあたりの供給速度を0.05〜0.25Nm3/(min・t)とし、
前記粉状精錬剤の溶銑1トンあたりの吹き込み速度を0.20〜1.00kg/(min・t)とし、
前記粉状精錬剤に含まれるCaOの溶銑1トンあたりの供給速度A(kg/(min・t))と、下記の(1)式及び(2)式によって定義される、脱珪処理で生成する酸化物融体における二酸化珪素生成速度B(kg/(min・t))との比A/Bを0.70以上、1.10以下として、
前記酸素含有ガスとともに前記粉状精錬剤を前記溶銑に吹き込むことを特徴とする、溶銑の脱珪処理方法。
B=CSiO2×Rf+(Fo+Co×Rf×0.7)×2.68×ηo …(1)
ηo=0.85−0.65×e−Rf/6Fo …(2)
ここで、CSiO2は粉状精錬剤中のSiO2の含有質量比率(−)、Rfは溶銑1トンあたりの粉状精錬剤の供給速度(kg/(min・t))、Foは溶銑1トンあたりの酸素含有ガス中の酸素ガスの供給速度(Nm3/(min・t))、Coは粉状精錬剤中の酸化鉄に含まれる酸素の粉状精錬剤に対する質量比率(−)、ηoは推定脱珪酸素効率(−)である。
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JPS5827322B2 (ja) * | 1979-12-24 | 1983-06-08 | 川崎製鉄株式会社 | 溶銑の製鋼予備処理方法 |
JP2013127089A (ja) * | 2011-12-17 | 2013-06-27 | Jfe Steel Corp | 溶銑予備処理方法 |
JP6897274B2 (ja) * | 2017-04-21 | 2021-06-30 | 日本製鉄株式会社 | 溶銑の予備処理方法 |
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