JP7180821B1 - 溶鋼の精錬方法 - Google Patents
溶鋼の精錬方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 256
- 239000010959 steel Substances 0.000 title claims abstract description 256
- 238000007670 refining Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 50
- 239000007789 gas Substances 0.000 claims abstract description 122
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 86
- 238000003756 stirring Methods 0.000 claims abstract description 64
- 238000009832 plasma treatment Methods 0.000 claims abstract description 44
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000007664 blowing Methods 0.000 claims abstract description 29
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 29
- 239000011593 sulfur Substances 0.000 claims abstract description 29
- 239000011261 inert gas Substances 0.000 claims abstract description 14
- 230000001678 irradiating effect Effects 0.000 claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 55
- 229910052760 oxygen Inorganic materials 0.000 claims description 39
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 38
- 239000001301 oxygen Substances 0.000 claims description 38
- 239000002893 slag Substances 0.000 claims description 31
- 229910052757 nitrogen Inorganic materials 0.000 claims description 26
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 17
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 17
- 235000013980 iron oxide Nutrition 0.000 claims description 15
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 claims description 13
- PPNAOCWZXJOHFK-UHFFFAOYSA-N manganese(2+);oxygen(2-) Chemical class [O-2].[Mn+2] PPNAOCWZXJOHFK-UHFFFAOYSA-N 0.000 claims description 13
- 238000011282 treatment Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 238000007667 floating Methods 0.000 claims description 9
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- 239000007924 injection Substances 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 abstract description 49
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- 239000012535 impurity Substances 0.000 abstract description 20
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 238000009628 steelmaking Methods 0.000 abstract description 5
- 238000006477 desulfuration reaction Methods 0.000 abstract description 4
- 230000023556 desulfurization Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 19
- 238000009849 vacuum degassing Methods 0.000 description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 230000004907 flux Effects 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 229910052782 aluminium Inorganic materials 0.000 description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 238000007654 immersion Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 125000004429 atom Chemical group 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007872 degassing Methods 0.000 description 3
- 238000006356 dehydrogenation reaction Methods 0.000 description 3
- 230000003009 desulfurizing effect Effects 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
xH+[N]=NHx ……(7)
yH+[S]=HyS ……(8)
ここで、[O]は溶鋼中の酸素、[N]は溶鋼中の窒素、[S]は溶鋼中の硫黄を表す。
前記ガス攪拌処理によって流動状態にある取鍋内溶鋼の表面に、当該取鍋内溶鋼の上方に設置されたプラズマ発生装置から、水素ガスまたは水素ガスを含む不活性ガスをプラズマガスとして下記の(1)式を満たす条件で照射するプラズマ処理を行ない、当該プラズマ処理によって溶鋼中に含まれる酸素、窒素、硫黄のうちから選ばれる1種または2種以上の元素の含有量を低減する、溶鋼の精錬方法。
ここで、GPはプラズマガスの流量(Nm3/min)、(H2)はプラズマガス中の水素ガス濃度(体積%)、Qは取鍋内溶鋼の溶鋼循環流量(ton/min)である。
ここで、Qは取鍋内溶鋼の溶鋼循環流量(ton/min)、Wmは取鍋内溶鋼の質量(ton)、tcは取鍋内溶鋼の溶鋼循環時間(min)、Dは取鍋内溶鋼浴の平均直径(m)、Hは取鍋内溶鋼浴の深さ(m)、εは攪拌動力(W/ton)、GBは取鍋内溶鋼への合計攪拌用ガス吹き込み流量(Nm3/min)、TLは取鍋内溶鋼の溶鋼温度(K)、P0はプラズマ照射領域の雰囲気圧力(torr)である。
ここで、rはプラズマ照射範囲半径(m)、gBは攪拌用ガスの吹き込み流量(Nm3/min/ガス吹き込み部1箇所)である。
xH+[N]=NHx ……(7)
yH+[S]=HyS ……(8)
(6)式、(7)式、(8)式において、[O]は溶鋼中の酸素、[N]は溶鋼中の窒素、[S]は溶鋼中の硫黄を表す。
(9)式において、Eは、プラズマ出力(kW)である。
本発明例においては、15分間の水素プラズマ処理を行うことにより、溶鋼中の酸素濃度、窒素濃度及び硫黄濃度は、同時に且つ速やかに30質量ppm以下まで低減した。プラズマ処理の開始前から終了後までのそれぞれの元素の除去率は、溶鋼中酸素が94%以上、溶鋼中窒素が33%以上、溶鋼中硫黄が20%以上であった。
2 取鍋
3 上蓋
4 黒煙電極
5 鉄皮
6 内張り耐火物
7 永久耐火物
8 底吹きプラグ
9 溶鋼
10 スラグ
11 プラズマトーチ
12 プラズマトーチ
13 攪拌用ガス気泡
Claims (14)
- 取鍋内に収容された溶鋼に攪拌用ガスを吹き込んで取鍋内の溶鋼を攪拌するガス攪拌処理を行う工程において、
前記ガス攪拌処理によって流動状態にある取鍋内溶鋼の表面に、当該取鍋内溶鋼の上方に設置されたプラズマ発生装置から、水素ガスまたは水素ガスを含む不活性ガスをプラズマガスとして下記の(1)式を満たす条件で照射するプラズマ処理を行ない、当該プラズマ処理によって溶鋼中に含まれる酸素、窒素、硫黄のうちから選ばれる1種または2種以上の元素の含有量を低減する、溶鋼の精錬方法。
プラズマガス中の水素ガス濃度(体積%)、Qは取鍋内溶鋼の溶鋼循
環流量(ton/min)である。 - 前記ガス攪拌処理は、前記取鍋の底部に1箇所または2箇所以上のガス吹き込み部を設置し、当該ガス吹き込み部から前記取鍋内溶鋼中に攪拌用ガスを吹き込むことで行われ、そのときの(4)式で算出される攪拌動力(ε)が、25W/ton以上である、請求項1または請求項2に記載の溶鋼の精錬方法。
- 前記取鍋内溶鋼にプラズマガスを照射する際の雰囲気圧力が150torr以下である、請求項1又は請求項2に記載の溶鋼の精錬方法。
- 前記取鍋内溶鋼にプラズマガスを照射する際の雰囲気圧力が150torr以下である、請求項3に記載の溶鋼の精錬方法。
- 前記取鍋内溶鋼にプラズマガスを照射する際の雰囲気圧力が150torr以下である、請求項4に記載の溶鋼の精錬方法。
- 取鍋内に収容した溶鋼の表面に浮遊するスラグは、鉄酸化物の濃度とマンガン酸化物の濃度との合計が5質量%以下である、請求項1又は請求項2に記載の溶鋼の精錬方法。
- 取鍋内に収容した溶鋼の表面に浮遊するスラグは、鉄酸化物の濃度とマンガン酸化物の濃度との合計が5質量%以下である、請求項3に記載の溶鋼の精錬方法。
- 取鍋内に収容した溶鋼の表面に浮遊するスラグは、鉄酸化物の濃度とマンガン酸化物の濃度との合計が5質量%以下である、請求項4に記載の溶鋼の精錬方法。
- 取鍋内に収容した溶鋼の表面に浮遊するスラグは、鉄酸化物の濃度とマンガン酸化物の濃度との合計が5質量%以下である、請求項5に記載の溶鋼の精錬方法。
- 取鍋内に収容した溶鋼の表面に浮遊するスラグは、鉄酸化物の濃度とマンガン酸化物の濃度との合計が5質量%以下である、請求項6に記載の溶鋼の精錬方法。
- 取鍋内に収容した溶鋼の表面に浮遊するスラグは、鉄酸化物の濃度とマンガン酸化物の濃度との合計が5質量%以下である、請求項7に記載の溶鋼の精錬方法。
- 前記プラズマ処理により、溶鋼に含まれる酸素、窒素、硫黄の3元素の含有量を同時に低減する、請求項1又は請求項2に記載の溶鋼の精錬方法。
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US (1) | US20240287633A1 (ja) |
EP (1) | EP4339302A4 (ja) |
JP (1) | JP7180821B1 (ja) |
KR (1) | KR20240008923A (ja) |
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Citations (1)
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JPS61149415A (ja) * | 1984-12-24 | 1986-07-08 | Sumitomo Metal Ind Ltd | 溶鉄からの脱銅・脱錫法 |
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JP4305792B2 (ja) * | 1999-03-25 | 2009-07-29 | ソニー株式会社 | 金属の精製方法及び精錬方法 |
CN100535153C (zh) * | 2006-11-24 | 2009-09-02 | 宝山钢铁股份有限公司 | 钢包精炼炉处理超纯铁素体不锈钢控制碳氮含量的方法 |
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JPS61149415A (ja) * | 1984-12-24 | 1986-07-08 | Sumitomo Metal Ind Ltd | 溶鉄からの脱銅・脱錫法 |
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AU2022297943A1 (en) | 2023-12-07 |
CN117500946A (zh) | 2024-02-02 |
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