JPH0211712A - Pre-treating agent for dephosphorization in molten iron - Google Patents
Pre-treating agent for dephosphorization in molten ironInfo
- Publication number
- JPH0211712A JPH0211712A JP16309388A JP16309388A JPH0211712A JP H0211712 A JPH0211712 A JP H0211712A JP 16309388 A JP16309388 A JP 16309388A JP 16309388 A JP16309388 A JP 16309388A JP H0211712 A JPH0211712 A JP H0211712A
- Authority
- JP
- Japan
- Prior art keywords
- cao
- dephosphorizing
- dephosphorization
- molten iron
- sio2
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 20
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 238000002844 melting Methods 0.000 claims description 17
- 230000008018 melting Effects 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000000292 calcium oxide Substances 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 4
- 229910052681 coesite Inorganic materials 0.000 abstract description 4
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 4
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 4
- 229910052682 stishovite Inorganic materials 0.000 abstract description 4
- 229910052905 tridymite Inorganic materials 0.000 abstract description 4
- 238000007664 blowing Methods 0.000 abstract description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract description 3
- 239000010436 fluorite Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 235000017550 sodium carbonate Nutrition 0.000 abstract description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 230000036284 oxygen consumption Effects 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 18
- 235000012255 calcium oxide Nutrition 0.000 description 9
- 239000000523 sample Substances 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910005084 FexOy Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000012256 powdered iron Substances 0.000 description 1
- -1 powdered iron ore Chemical compound 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は溶銑脱りん用予備処理剤に係り、特に脱りん反
応効率のすぐれた予備処理剤に関し、製鋼の分野で利用
される。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pretreatment agent for dephosphorizing hot metal, and particularly to a pretreatment agent with excellent dephosphorization reaction efficiency, and is used in the field of steel manufacturing.
近時、転炉における負荷の軽減と送酸量の低減のため、
混銑車等において溶銑の脱珪、脱りん、脱硫の予備処理
が広く行われるようになった。Recently, in order to reduce the load on converters and reduce the amount of oxygen sent,
Preliminary treatments such as desiliconization, dephosphorization, and desulfurization of hot metal have become widely used in pig iron mixing cars and the like.
従来、溶銑の脱りん用予備処理剤としては、スケール、
粉鉄鉱石等の酸化鉄に生石灰、はたる石等を加へ、更に
必要により少量のソーダ灰系フラックスを加えた酸化鉄
主体の予備処理剤が使用されていた。Traditionally, scale,
A pretreatment agent consisting mainly of iron oxide was used, which was made by adding quicklime, gravel, etc. to iron oxide such as powdered iron ore, and if necessary, adding a small amount of soda ash type flux.
しかし、従来のこれらの脱りん用予備処理剤は、第１図
に示すＣａＯ−８ｉｎ２−Ｆｅ２０３の三元状態図から
明らかな如く酸化鉄Ｆｅ２Ｏ３そのものの融点が１５０
０℃近傍にあるため、酸化鉄に生石灰、はたる石等を添
加しても、通常の溶銑温度は１３００〜１４５０℃程度
であるので、酸化鉄の融点が高すぎて十分に滓化せず、
従って十分に脱りん反応が行われず脱りん反応効率が低
かった。However, as is clear from the ternary phase diagram of CaO-8in2-Fe203 shown in Figure 1, these conventional pretreatment agents for dephosphorization have a melting point of iron oxide Fe2O3 itself of 150.
Since the temperature is close to 0℃, even if quicklime, gravel, etc. are added to iron oxide, the normal hot metal temperature is about 1300 to 1450℃, so the melting point of iron oxide is too high and it does not slag sufficiently. ,
Therefore, the dephosphorization reaction was not carried out sufficiently and the dephosphorization reaction efficiency was low.
また、滓化を促進するため、大量のほたる石を使用する
必要があった。In addition, it was necessary to use large amounts of fluorite to promote slag formation.
本発明の目的は、上記従来技術の問題点を解決し、脱り
ん反応効率が高く、はたる石の添加を必要としない溶銑
脱りん用予備処理剤を提供するにある。An object of the present invention is to solve the problems of the prior art described above, to provide a pretreatment agent for hot metal dephosphorization that has high dephosphorization reaction efficiency and does not require the addition of flute.
〔問題点を解決するための手段および作用〕本発明の要
旨とするところは次の如くである。[Means and operations for solving the problems] The gist of the present invention is as follows.
すなわち、酸化鉄ＦｅｘＯｙにＣａＯおよび５ｉｎ２を
添加するに際し、
塩基度 ＣａＯ／５ｉｎ２≧２
全鉄分 Ｔ、Ｆｅ２５０重量％
なる条件を満足する混合組成物を溶解もしくは焼結する
ことにより融点を１４５０℃以下に低下せしめて成るこ
とを特徴とする溶銑腕りん用予備処理剤である。That is, when adding CaO and 5in2 to iron oxide FexOy, melting or sintering a mixed composition that satisfies the following conditions: basicity CaO/5in2≧2 total iron content T, Fe250% by weight, the melting point is lowered to 1450°C or less. This is a pretreatment agent for hot metal arm phosphorus, which is characterized by reducing the phosphorescence of hot metal.
本発明における条件の限定理由について説明する。まず
。塩基度を２以上に限定したのは次の理由による。第２
図に脱Ｓｉ外０２原単位と脱Ｐ量と塩基度ＣａＯ／Ｓｉ
Ｏ２の関係を示したが、塩基度が２．０未満では脱りん
効果が小さく、２．０以上の場合は脱りん効果が格段に
大となるので、本発明では塩基度を２以上に限定した。The reasons for limiting the conditions in the present invention will be explained. first. The basicity was limited to 2 or more for the following reason. Second
The figure shows the basic unit of 02 for Si removal, amount of P removal, and basicity CaO/Si.
The relationship between O2 was shown, but if the basicity is less than 2.0, the dephosphorization effect is small, and if it is 2.0 or more, the dephosphorization effect is much greater, so in the present invention, the basicity is limited to 2 or more. did.
次に、第３図に予備処理剤の融点と脱Ｓｌ外脱Ｐ反応率
との関係を示したが、同図において融点が１４５０℃以
下の場合に脱りん反応効率が高いので本発明においては
融点を１４５０℃以下に限定した。ここに「脱Ｓｉ外ｊ
とは「脱珪反応に作用した以外の、」との意である。Next, FIG. 3 shows the relationship between the melting point of the pretreatment agent and the reaction rate of dephosphorization and desilization. The melting point was limited to 1450°C or lower. Here's "De-Si"
means "other than that acting on the desiliconization reaction."
また、酸化鉄の混合量は、Ｔ、Ｆｅで５０％未満の場合
は脱りん剤として酸化機能に乏しく、使用量が増加しス
ラグ量も増加するので、本発明においては、鉄分の含有
量を５０％以上に限定した。In addition, if the mixed amount of iron oxide is less than 50% of T and Fe, it will have poor oxidizing function as a dephosphorizing agent, and the amount used will increase and the amount of slag will increase. Therefore, in the present invention, the iron content is Limited to 50% or more.
なお、第１図のＣａＯ−８ｘ Ｏ２Ｆ ｅ２０ ：＋の
三元状態図において、前記の本発明の要件を満足した範
囲を斜線で示した。また、ＣａＯ−３ｉ Ｏ２Ｆｅ、０
３の他に微量の数種の成分を含有した多成分系において
も本発明は適用することが可能である。In addition, in the ternary phase diagram of CaO-8x O2F e20 :+ in FIG. 1, the range that satisfies the requirements of the present invention is indicated by diagonal lines. Also, CaO-3i O2Fe, 0
The present invention can also be applied to a multi-component system containing trace amounts of several other components in addition to 3.
本発明においては酸化鉄に限定量のＣａＯおよびＳｉＯ
□を添加混合して溶解もしくは焼結するのであるが、溶
解、焼結の方法は特に限定するものではなく、２．３の
例を次に列記する。In the present invention, limited amounts of CaO and SiO are added to iron oxide.
□ is added and mixed and melted or sintered, but the method of melting and sintering is not particularly limited, and examples of 2.3 are listed below.
（Ａ） 第４図（Ａ）に示す如く酸化鉄とＣａＯおよ
びＳｉｏ２の混合組成物２を誘導加熱コイル４で加熱し
て溶解する。(A) As shown in FIG. 4(A), a mixed composition 2 of iron oxide, CaO, and Sio2 is heated and dissolved by an induction heating coil 4.
（Ｂ） 第４図（Ｂ）に示す如く、混合組成物２を容
器に収容した後、撹拌用ランス６で撹拌しながら、上部
からバーナー８で加熱して溶解する。(B) As shown in FIG. 4(B), after the mixed composition 2 is placed in a container, it is heated with a burner 8 from above and dissolved while being stirred with a stirring lance 6.
（Ｃ） 第４図（Ｃ）に示す如く、混合組成物２を吹
込み用ランス１０で容器に吹込みながら上部からバーナ
ー８で加熱し溶解する。(C) As shown in FIG. 4(C), the mixed composition 2 is blown into the container with a blowing lance 10 and heated from above with a burner 8 to dissolve it.
上記の如く、限定成分の混合組成物を溶解もしくは焼結
して製造された本発明の溶銑腕りん用予備処理剤は、融
点が低く容易に滓化し、すぐれた脱りん反応効率を示す
。As described above, the hot metal arm phosphor pretreatment agent of the present invention produced by melting or sintering the mixed composition of limited components has a low melting point, easily turns into slag, and exhibits excellent dephosphorization reaction efficiency.
第１表に本発明の条件を満足した供試材Ｎα１および２
の溶銑腕りん用予備処理剤の化学組成および融点を示し
た。なお、比較のために塩基度Ｃａ○／５ｉｎ２の点で
本発明の条件を満足しない供試材Ｎα３と、全鉄分子、
Ｆｅの点で本発明の条件を満足しない供試材Ｎα４の比
較例についても第１表に化学組成と融点を示した。Table 1 shows sample materials Nα1 and 2 that satisfied the conditions of the present invention.
The chemical composition and melting point of the pretreatment agent for hot metal phosphorus are shown. For comparison, sample material Nα3, which does not satisfy the conditions of the present invention in terms of basicity Ca○/5in2, and total iron molecules,
Table 1 also shows the chemical composition and melting point of a comparative example of sample material Nα4 which does not satisfy the conditions of the present invention in terms of Fe.
これらの予備処理剤を使用して、同一条件で溶銑の脱り
ん処理を行いその結果を比較した。すなわち、塩基度Ｃ
ａＯ／ＳｉＯ、≧２なる条件を満足しない供試材Ｎａ
３では融点が１４．５０−１５００ ’Ｃと高いために
脱りん反応効率が劣る。Using these pretreatment agents, hot metal was dephosphorized under the same conditions and the results were compared. That is, basicity C
Sample material Na that does not satisfy the condition aO/SiO, ≧2
No. 3 has a high melting point of 14.50-1500'C, so the dephosphorization reaction efficiency is poor.
また塩基度ＣａＯ／ＳｉＯ２≧２なる条件を満足するも
全鉄分子、Ｆｅ２５０％なる条件を満さない供試材Ｎα
４では、予備処理剤中の固体酸素が少なく、脱りんに必
要な酸素供給律速のため供試材Ｎａ １、Ｎｏ２に比し
て反応効率が低下した。かくの如く、本発明のすべての
要件を満足する場合に、脱りん効率が著しく高くなるこ
とが判明した。Also, the sample material Nα which satisfies the condition of basicity CaO/SiO2≧2 but does not satisfy the condition of total iron molecule and Fe250%
In sample No. 4, there was less solid oxygen in the pretreatment agent, and the rate of oxygen supply required for dephosphorization was limited, so the reaction efficiency was lower than that of sample materials Na 1 and No. 2. As described above, it has been found that when all the requirements of the present invention are satisfied, the dephosphorization efficiency is significantly increased.
本発明は上記実施例からも明らかな如く、酸化鉄に限定
量のＣａＯおよびＳｉＯ□を添加して溶解もしくは焼結
し、溶銑腕りん用予備処理剤の融点を下げることにより
、溶銑予備処理において脱りん反応効率を著しく高める
効果を挙げることができた。As is clear from the above examples, the present invention is effective in hot metal pretreatment by adding a limited amount of CaO and SiO□ to iron oxide and melting or sintering it to lower the melting point of the pretreatment agent for hot metal arm phosphor. It was possible to achieve the effect of significantly increasing the dephosphorization reaction efficiency.
第１図は本発明の組成範囲を示す
ＣａＯ−８ｉｎ□−Ｆｅ２０３の三元状態図、第２図は
脱Ｓｌ外０２原単位と脱Ｐ量と塩基度との関係を示す線
図、第３図は予備処理剤の融点と脱Ｓｊ外脱Ｐ反応効率
との関係を示す線図、第４図（Ａ）、（Ｂ）、（Ｃ）は
いずれも本発明の製造方法を示す装置の断面図で（Ａ）
は誘導加熱方式、（Ｂ）は撹拌方式、（Ｃ）は吹込み方
式である。Fig. 1 is a ternary phase diagram of CaO-8in□-Fe203 showing the composition range of the present invention, Fig. 2 is a diagram showing the relationship between 02 basic unit of removal of Sl, amount of P removal, and basicity, Fig. 3 The figure is a diagram showing the relationship between the melting point of the pretreatment agent and the Sj removal and P removal reaction efficiency. Figures 4 (A), (B), and (C) are all cross sections of the apparatus showing the manufacturing method of the present invention. In the diagram (A)
(B) is an induction heating method, (B) is a stirring method, and (C) is a blowing method.
Claims (1)
を添加するに際し、 塩基度 ＣａＯ／ＳｉＯ＿２≧２ 全鉄分 Ｔ、Ｆｅ≧５０重量％ なる条件を満足する混合組成物を溶解もしくは焼結する
ことにより融点を１４５０℃以下に低下せしめて成るこ
とを特徴とする溶銑脱りん用予備処理剤。(1) Iron oxide Fe_xO_y with CaO and SiO_2
When adding , the melting point is lowered to 1450°C or less by melting or sintering a mixed composition that satisfies the following conditions: basicity CaO/SiO_2≧2 total iron content T, Fe≧50% by weight Pretreatment agent for hot metal dephosphorization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16309388A JP2622584B2 (en) | 1988-06-30 | 1988-06-30 | Pretreatment agent for hot metal dephosphorization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16309388A JP2622584B2 (en) | 1988-06-30 | 1988-06-30 | Pretreatment agent for hot metal dephosphorization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0211712A true JPH0211712A (en) | 1990-01-16 |
| JP2622584B2 JP2622584B2 (en) | 1997-06-18 |
Family
ID=15767049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16309388A Expired - Lifetime JP2622584B2 (en) | 1988-06-30 | 1988-06-30 | Pretreatment agent for hot metal dephosphorization |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2622584B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010060907A (en) * | 1999-12-28 | 2001-07-07 | 이구택 | BOP Slag dephosphorization |
| JP2007092158A (en) * | 2005-09-30 | 2007-04-12 | Jfe Steel Kk | Dephosphorize-treatment method for molten iron |
| JP2009249644A (en) * | 2008-04-01 | 2009-10-29 | Kobe Steel Ltd | Method for charging pre-melt slag-formation promotive agent |
| JP2021046582A (en) * | 2019-09-19 | 2021-03-25 | Ｊｆｅスチール株式会社 | Dephosphorization treatment method for molten iron |
| JP2021046583A (en) * | 2019-09-19 | 2021-03-25 | Ｊｆｅスチール株式会社 | Pretreatment method for molten iron |
-
1988
- 1988-06-30 JP JP16309388A patent/JP2622584B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010060907A (en) * | 1999-12-28 | 2001-07-07 | 이구택 | BOP Slag dephosphorization |
| JP2007092158A (en) * | 2005-09-30 | 2007-04-12 | Jfe Steel Kk | Dephosphorize-treatment method for molten iron |
| JP2009249644A (en) * | 2008-04-01 | 2009-10-29 | Kobe Steel Ltd | Method for charging pre-melt slag-formation promotive agent |
| JP2021046582A (en) * | 2019-09-19 | 2021-03-25 | Ｊｆｅスチール株式会社 | Dephosphorization treatment method for molten iron |
| JP2021046583A (en) * | 2019-09-19 | 2021-03-25 | Ｊｆｅスチール株式会社 | Pretreatment method for molten iron |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2622584B2 (en) | 1997-06-18 |
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