JP2622584B2 - Pretreatment agent for hot metal dephosphorization - Google Patents
Pretreatment agent for hot metal dephosphorizationInfo
- Publication number
- JP2622584B2 JP2622584B2 JP16309388A JP16309388A JP2622584B2 JP 2622584 B2 JP2622584 B2 JP 2622584B2 JP 16309388 A JP16309388 A JP 16309388A JP 16309388 A JP16309388 A JP 16309388A JP 2622584 B2 JP2622584 B2 JP 2622584B2
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- dephosphorization
- pretreatment agent
- sio
- cao
- 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.)
- Expired - Lifetime
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
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。The present invention relates to a pretreatment agent for hot metal dephosphorization, and more particularly to a pretreatment agent having excellent dephosphorization reaction efficiency, and is used in the field of steelmaking.
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。In recent years, in order to reduce the load on converters and the amount of acid supply, pretreatment of hot metal desiliconization, dephosphorization, and desulfurization of hot metal has become widespread.
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、ほたる石等へ加え、
更に必要により少量のソース灰系フラツクスを加えた酸
化鉄主体の予備処理剤が使用されていた。Conventionally, as a pretreatment agent for dephosphorization of hot metal, scale, iron oxide such as fine iron ore, in addition to quicklime, fluorite, etc.
Further, a pretreatment agent mainly composed of iron oxide to which a small amount of source ash-based flux is added as necessary has been used.
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−SiO2−Fe2O3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1500℃近傍にあるた
め、酸化鉄に生石灰、ほ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、従つて十分に脱りん反応が
行われず脱りん反応効率が低かつた。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つた。However, these conventional pretreatment agents for dephosphorization are the first
For obvious as iron oxide Fe 2 O 3 itself melting ternary phase diagram of CaO-SiO 2 -Fe 2 O 3 shown in the figure in the vicinity 1500 ° C., quicklime iron oxide, the addition of fluorite, etc. However, since the normal hot metal temperature is about 1300 to 1450 ° C., the melting point of iron oxide is too high to form slag sufficiently, so that the dephosphorization reaction is not sufficiently performed and the dephosphorization reaction efficiency is low. Also, a large amount of fluorite had to be used to promote slagification.
〔発明が解決しようとする問題点〕 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、ほ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。[Problems to be Solved by the Invention] An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a pretreatment agent for hot metal dephosphorization that has a high dephosphorization reaction efficiency and does not require the addition of fluorite. To be.
本発明の要旨とするところは次の如くである。すなわ
ち、酸化鉄FexOyにCaOおよびSiO2を添加するに際し、 塩基度 CaO/SiO2≧２ 全鉄粉 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である。The gist of the present invention is as follows. That is, when CaO and SiO 2 are added to the iron oxide FexOy, a basic composition of CaO / SiO 2 ≧ 2 total iron powder T, Fe ≧ 50% by weight is dissolved or sintered to obtain a melting point. Is reduced to 1450 ° C. or less.
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O2原単位と脱Ｐ量と塩基度CaO/SiO2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 described. First, the reason for limiting the basicity to 2 or more is as follows. Second showed de Si outer O 2 consumption rate and de P amount and basicity CaO / SiO 2 relation in the figure, small dephosphorization effect in basicity is less than 2.0, the dephosphorization effect in the case of 2.0 or more In the present invention, the basicity is limited to 2 or more, because it is extremely large.
次に、第３図に予備処理剤の融点と脱Si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」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 rate of P removal from the outside of Si. In the same figure, when the melting point is 1450 ° C. or less, the rate of dephosphorization is high. Melting point
Limited to 1450 ° C or less. Here, “outside of de-Si” means “other than the effect 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。Further, when the mixing amount of iron oxide is less than 50% by T.Fe, the oxidizing function is poor as a dephosphorizing agent, the amount used is increased, and the amount of slag is also increased.
Limited to 50% or more.
なお、第１図のCaO−SiO2−Fe2O3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−SiO2−Fe2O3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 the ternary phase diagram of CaO—SiO 2 —Fe 2 O 3 shown in FIG. 1, the range satisfying the requirements of the present invention is indicated by oblique lines. Further, the present invention can be applied to a multi-component system containing trace amounts of several components in addition to CaO—SiO 2 —Fe 2 O 3 .
本発明においては酸化鉄に限定量のCaOおよびSiO2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, a limited amount of CaO and SiO 2 is added to iron oxide and mixed and dissolved or sintered.
The method of sintering is not particularly limited, and a few examples are listed below.
（Ａ） 第４図（Ａ）に示す如く酸化鉄とCaOおよびSiO
2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), iron oxide and CaO and SiO
The mixed composition 2 of 2 heated by an induction heating coil 4 to dissolve.
（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、攪拌用ランス６で攪拌しながら、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 accommodated in a container, it is heated and melted from above by a burner 8 while being stirred by 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８で
加熱し溶解する。(C) As shown in FIG. 4 (C), the mixed composition 2 is heated and melted by the burner 8 from above while being blown into the container by the blowing lance 10.
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脱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 pretreatment agent for hot metal dephosphorization of the present invention manufactured by dissolving or sintering the mixed composition of the limited components,
It has a low melting point and easily slags, and exhibits excellent dephosphorization reaction efficiency.
第１表に本発明の条件を満足した供試材No.1および２
の溶銑脱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CaO/SiO2の点で本発明の
条件を満足しない供試材No.3と、全鉄分Ｔ、Feの点で本
発明の条件を満足しない供試材No.4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 that the test materials No. 1 and No. 2 satisfying the conditions of the present invention
The chemical composition and melting point of the pretreatment agent for hot metal dephosphorization were shown. For comparison, test material No. 3 which does not satisfy the conditions of the present invention in terms of basicity CaO / SiO 2 and test material No. 3 which does not satisfy the conditions of the present invention in terms of total iron T and Fe. Table 1 also shows the chemical composition and melting point of Comparative Example 4 as well.
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CaO/SiO2≧２なる条件を満足しない供試材No.3で
は融点が1450〜1500℃と高いために脱りん反応効率が劣
る。Using these pretreatment agents, dissolve under the same conditions. Iron was dephosphorized and the results were compared. That is,
Sample No. 3 which does not satisfy the condition of basicity CaO / SiO 2 ≧ 2 has a high melting point of 1450 to 1500 ° C., and thus has a low dephosphorization reaction efficiency.
また塩基度CaO/SiO2≧２なる条件を満足するも全鉄分
Ｔ、Fe≧50％なる条件を満さない供試材No.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No.1、No.2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。In the test material No. 4 which satisfies the condition of basicity CaO / SiO 2 ≧ 2 but does not satisfy the condition of total iron content T and Fe ≧ 50%, the solid oxygen in the pretreatment agent is small, and The reaction efficiency was lower than that of test materials No. 1 and No. 2 due to the required oxygen supply rate-limiting. Thus, 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SiO23を添加して溶解もしくは焼結し、
溶銑脱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。The present invention, as is evident from the above examples, added a limited amount of CaO and SiO 23 to iron oxide and dissolved or sintered,
By lowering the melting point of the pretreatment agent for hot metal dephosphorization, the dephosphorization reaction efficiency was significantly improved in the hot metal pretreatment.
第１図は本発明の組成範囲を示すCaO−SiO2−Fe2O3の三
元状態図、第２図は脱Si外O2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Si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）は攪拌方式、
（Ｃ）は吹込み方式である。FIG. 1 is a ternary phase diagram of CaO—SiO 2 —Fe 2 O 3 showing the composition range of the present invention, and FIG. 2 is a line showing the relationship between the basic unit of O 2, the amount of P removed, and the basicity. FIG. 3 is a diagram showing the relationship between the melting point of the pretreatment agent and the efficiency of the P-removal of the Si-removing agent.
(B) and (C) are cross-sectional views of an apparatus showing the production method of the present invention, wherein (A) is an induction heating method, (B) is a stirring method,
(C) is a blowing method.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山本 武美 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 (72)発明者 数土 文夫 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takemi Yamamoto 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. 1-chome (without address) Inside Kawasaki Steel Corporation Mizushima Works
Claims (1)
際し、 塩基度 CaO/SiO2≧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. A method for dissolving or sintering a mixed composition which satisfies the following conditions when adding CaO and SiO 2 to iron oxide FexOy: basicity: CaO / SiO 2 ≧ 2, total iron content T, Fe ≧ 50% by weight. A pretreatment agent for hot metal dephosphorization, characterized in that the melting point is lowered to 1450 ° C or less by heat treatment.
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 JPH0211712A (en) | 1990-01-16 |
| JP2622584B2 true 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) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010060907A (en) * | 1999-12-28 | 2001-07-07 | 이구택 | BOP Slag dephosphorization |
| JP4735169B2 (en) * | 2005-09-30 | 2011-07-27 | Ｊｆｅスチール株式会社 | Hot metal dephosphorization method |
| JP5334442B2 (en) * | 2008-04-01 | 2013-11-06 | 株式会社神戸製鋼所 | Method of charging premelt hatching accelerator |
| JP7107292B2 (en) * | 2019-09-19 | 2022-07-27 | Ｊｆｅスチール株式会社 | Hot metal dephosphorization treatment method |
| JP7095668B2 (en) * | 2019-09-19 | 2022-07-05 | Ｊｆｅスチール株式会社 | Pretreatment method for hot metal |
-
1988
- 1988-06-30 JP JP16309388A patent/JP2622584B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0211712A (en) | 1990-01-16 |
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