JP2008196026A - 溶銑の予備処理方法 - Google Patents
溶銑の予備処理方法 Download PDFInfo
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- JP2008196026A JP2008196026A JP2007033974A JP2007033974A JP2008196026A JP 2008196026 A JP2008196026 A JP 2008196026A JP 2007033974 A JP2007033974 A JP 2007033974A JP 2007033974 A JP2007033974 A JP 2007033974A JP 2008196026 A JP2008196026 A JP 2008196026A
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- Prior art keywords
- hot metal
- pig iron
- blowing
- gaseous oxygen
- molten pig
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000805 Pig iron Inorganic materials 0.000 title abstract 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 35
- 239000001301 oxygen Substances 0.000 claims abstract description 35
- 239000007800 oxidant agent Substances 0.000 claims abstract description 27
- 238000007664 blowing Methods 0.000 claims abstract description 22
- 239000007787 solid Substances 0.000 claims abstract description 18
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 15
- 239000004571 lime Substances 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims description 101
- 229910052751 metal Inorganic materials 0.000 claims description 101
- 238000012545 processing Methods 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000002203 pretreatment Methods 0.000 claims description 6
- 238000004898 kneading Methods 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 12
- 239000000292 calcium oxide Substances 0.000 abstract description 6
- 235000012255 calcium oxide Nutrition 0.000 abstract description 6
- 230000000717 retained effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000007796 conventional method Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 238000007670 refining Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000029142 excretion Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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)
Abstract
【解決手段】 処理容器に保持した溶銑中に、インジェクションランスを浸漬し、該ランスを介して酸化剤と石灰系造滓剤を、処理の開始当初より終了まで連続的に吹き込み、該溶銑から脱珪及び脱燐を行う溶銑の予備処理方法を改良した。改良後の方法は、処理開始当初は、気体酸素だけを吹き込み、溶銑のSi濃度が0.1質量%まで低下した後に、前記気体酸素に加え、固体酸化剤及び生石灰を吹き込むと同時に、前記処理容器の上方空間に別途設けた上吹きランスを介して、該溶銑の浴面上に気体酸素を吹き付けるものである。
【選択図】 図1
Description
図1によれば、気体酸素だけの吹込みで、溶銑のSi濃度は、0.1質量%まで低下すると上記脱珪効率が急激に低下してくる。そこで、発明者は、前記気体酸素だけを溶銑中に吹き込む期間を溶銑のSi濃度が0.1質量%までの期間と定めることにしたのである。なお、このような溶銑の脱珪効率が急激に低下してくる時期は、気体酸素を吹き込む対象となる溶銑の組成(特にSi濃度)や温度、気体酸素の吹き込み流量等の処理条件に依存して変化する。しかしながら、多くの実験結果に基づくと、実際に予備処理される条件下では、気体酸素だけを溶銑中に吹き込む期間を溶銑のSi濃度:0.1質量%として十分であることが確認できた。
2 溶銑
3 インジェクションランス
4 気体酸素
5 固体酸化剤
6 石灰系造滓剤
7 スラグ
8 上吹きランス
9 フリーボード
Claims (3)
- 処理容器に保持した溶銑中に、インジェクションランスを浸漬し、該インジェクションランスを介して酸化剤と石灰系造滓剤を吹き込み、該溶銑からの脱珪及び脱燐を行う溶銑の予備処理方法において、
処理開始当初は、石灰系造滓剤は吹き込まずに専ら酸化剤として気体酸素だけを吹き込み、溶銑のSi濃度が0.1質量%まで低下した後に、前記気体酸素に加え、固体酸化剤及び石灰系造滓剤を吹き込むと同時に、前記処理容器の上方空間に別途設けた上吹きランスを介して、該溶銑の浴面上に気体酸素を吹き付けることを特徴とする溶銑の予備処理方法。 - 前記処理容器を溶銑鍋又は混銑車とすることを特徴とする請求項1記載の溶銑の予備処理方法。
- 前記固体酸化剤を、焼結鉱、製鉄ダスト及び/又はミルスケールとすることを特徴とする請求項1又は2記載の溶銑の予備処理方法。
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JP2008196026A true JP2008196026A (ja) | 2008-08-28 |
JP4984946B2 JP4984946B2 (ja) | 2012-07-25 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013127089A (ja) * | 2011-12-17 | 2013-06-27 | Jfe Steel Corp | 溶銑予備処理方法 |
JP2013133484A (ja) * | 2011-12-26 | 2013-07-08 | Jfe Steel Corp | 転炉精錬方法 |
JP5790964B2 (ja) * | 2013-01-18 | 2015-10-07 | Jfeスチール株式会社 | 溶銑の予備処理方法 |
KR101608808B1 (ko) * | 2014-07-18 | 2016-04-05 | 주식회사 포스코 | 용선 탈린방법 |
KR20160067270A (ko) * | 2014-12-03 | 2016-06-14 | 주식회사 포스코 | 고효율 용선예비처리방법 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5378913A (en) * | 1976-12-24 | 1978-07-12 | Nippon Steel Corp | Refining method for steel for decreasing generating amount of slag |
JPS5497518A (en) * | 1978-01-18 | 1979-08-01 | Sumitomo Metal Ind Ltd | Dephosphorization of molten pig iron |
JPH055114A (ja) * | 1991-06-14 | 1993-01-14 | Kawasaki Steel Corp | 溶銑予備処理方法 |
JPH11323419A (ja) * | 1998-03-19 | 1999-11-26 | Nkk Corp | 溶銑精錬方法 |
JP2001329309A (ja) * | 2000-05-17 | 2001-11-27 | Kobe Steel Ltd | 溶銑脱りん処理法 |
JP2004190101A (ja) * | 2002-12-12 | 2004-07-08 | Nippon Steel Corp | 溶銑の予備処理方法 |
-
2007
- 2007-02-14 JP JP2007033974A patent/JP4984946B2/ja active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5378913A (en) * | 1976-12-24 | 1978-07-12 | Nippon Steel Corp | Refining method for steel for decreasing generating amount of slag |
JPS5497518A (en) * | 1978-01-18 | 1979-08-01 | Sumitomo Metal Ind Ltd | Dephosphorization of molten pig iron |
JPH055114A (ja) * | 1991-06-14 | 1993-01-14 | Kawasaki Steel Corp | 溶銑予備処理方法 |
JPH11323419A (ja) * | 1998-03-19 | 1999-11-26 | Nkk Corp | 溶銑精錬方法 |
JP2001329309A (ja) * | 2000-05-17 | 2001-11-27 | Kobe Steel Ltd | 溶銑脱りん処理法 |
JP2004190101A (ja) * | 2002-12-12 | 2004-07-08 | Nippon Steel Corp | 溶銑の予備処理方法 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013127089A (ja) * | 2011-12-17 | 2013-06-27 | Jfe Steel Corp | 溶銑予備処理方法 |
JP2013133484A (ja) * | 2011-12-26 | 2013-07-08 | Jfe Steel Corp | 転炉精錬方法 |
JP5790964B2 (ja) * | 2013-01-18 | 2015-10-07 | Jfeスチール株式会社 | 溶銑の予備処理方法 |
KR101608808B1 (ko) * | 2014-07-18 | 2016-04-05 | 주식회사 포스코 | 용선 탈린방법 |
KR20160067270A (ko) * | 2014-12-03 | 2016-06-14 | 주식회사 포스코 | 고효율 용선예비처리방법 |
KR101677341B1 (ko) * | 2014-12-03 | 2016-11-18 | 주식회사 포스코 | 고효율 용선예비처리방법 |
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