JPS63250411A - Dephosphorizing agent for molten pig iron - Google Patents
Dephosphorizing agent for molten pig ironInfo
- Publication number
- JPS63250411A JPS63250411A JP8282787A JP8282787A JPS63250411A JP S63250411 A JPS63250411 A JP S63250411A JP 8282787 A JP8282787 A JP 8282787A JP 8282787 A JP8282787 A JP 8282787A JP S63250411 A JPS63250411 A JP S63250411A
- Authority
- JP
- Japan
- Prior art keywords
- cao
- dephosphorizing agent
- caf2
- ratio
- hot metal
- 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
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 28
- 229910000805 Pig iron Inorganic materials 0.000 title abstract 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract 2
- 239000002184 metal Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- 239000011574 phosphorus Substances 0.000 claims 1
- 238000005261 decarburization Methods 0.000 abstract description 8
- 239000002893 slag Substances 0.000 abstract description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract description 6
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract description 6
- 238000002156 mixing Methods 0.000 abstract description 2
- 230000009257 reactivity Effects 0.000 abstract description 2
- 102100032986 CCR4-NOT transcription complex subunit 8 Human genes 0.000 abstract 1
- 101000942586 Homo sapiens CCR4-NOT transcription complex subunit 8 Proteins 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000005507 spraying 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」
本発明ば溶銑を転炉にて１１１課するに先立ち、溶銑の
段階で予め脱燐処理を行うための溶銑脱燐剤の組成に関
するものである。Detailed Description of the Invention "Field of Industrial Application" The present invention relates to the composition of a hot metal dephosphorizing agent for pre-dephosphorizing hot metal at the stage of hot metal prior to being subjected to 111 in a converter. be.
「従来の技術」
従来、転炉における脱燐負荷の大きい極低燐銅、高炭素
鋼等を精錬するに際しては、造滓剤の増量、ダブルスラ
グ法等が採用されていた。"Conventional Technology" Conventionally, when refining ultra-low phosphorous copper, high carbon steel, etc., which require a large dephosphorization load in a converter, increasing the amount of slag forming agent, double slug method, etc. have been adopted.
しかし、近年になって熱力学的に有利である溶銑段階で
の脱燐法、即ち溶銑予備処理方法が注目されてきている
。However, in recent years, attention has been paid to a thermodynamically advantageous dephosphorization method at the hot metal stage, that is, a hot metal pretreatment method.
乙の溶銑予備処理に用いる脱燐剤としては通常粉体のＣ
ａＯ、ＣａＦ、及び酸化鉄を主体とした石灰系のものが
用いられ、溶銑中にインジェクシヨンすることにより、
脱燐処理が行われている。Powdered C is usually used as a dephosphorizing agent for pre-treatment of hot metal.
A lime-based material mainly consisting of aO, CaF, and iron oxide is used, and by injecting it into hot metal,
Dephosphorization treatment is being carried out.
「発明が解決しようとする問題点」
前記の石灰系の脱燐剤を用いた場合は、生成するスラグ
の塩基性が低い欠点があることや、脱燐剤と溶銑界面の
酸素ポテンシャルによって脱燐反応が左右されることは
一般的に知られていた。``Problems to be Solved by the Invention'' When using the above-mentioned lime-based dephosphorizing agent, there are disadvantages in that the basicity of the slag produced is low, and the oxygen potential at the interface between the dephosphorizing agent and hot metal makes it difficult to dephosphorize. It was generally known that reactions were affected.
例えば、脱燐剤中の固体酸素量（酸化鉄）が少ないと脱
燐処理剤であるＣａＯ、ＣａＦｚの利用効率が低下し、
そのために多量のＣａＯ、Ｃａ−を添加しなければなら
ず、その結果スラグ量が増加する。For example, if the amount of solid oxygen (iron oxide) in the dephosphorizing agent is low, the utilization efficiency of the dephosphorizing agents CaO and CaFz will decrease,
Therefore, a large amount of CaO and Ca- must be added, and as a result, the amount of slag increases.
−力説燐剤中の固体酸素量が多いと個体酸素源分解によ
る溶銑温度低下が顕著になると共に脱炭量が増加し、次
工程である転炉精練における熱源不足を惹起するなどの
問題があった。- If the amount of solid oxygen in the phosphor is large, the temperature of the hot metal will drop significantly due to the decomposition of the solid oxygen source, and the amount of decarburization will increase, causing problems such as a lack of heat source in the next process, converter smelting. Ta.
こり為に適当な酸素ポテンシャルを有す脱燐剤を得るこ
とによって、これらの問題を解消しようとしていたが、
常時安定した効果的な脱燐剤を得ることは出来なかった
。Attempts have been made to solve these problems by obtaining a dephosphorizing agent with an appropriate oxygen potential.
It was not possible to obtain a consistently stable and effective dephosphorizing agent.
「問題点を解決するための手段」
発明者らは常に最小限のＣａＯ、Ｃａ−によって脱燐し
、且つ過度の脱炭が生じない脱燐剤を得るには単に酸素
ポテンシャル値を操作するだけではなく ＣａＯとＣａ
Ｆとの配合を成る比率の基で酸素ボテンシャルをも成る
範囲内に調整しな脱燐剤が最も有効であることを知見し
た。"Means for Solving the Problem" The inventors found that in order to obtain a dephosphorizing agent that always dephosphorsizes with a minimum amount of CaO and Ca- and does not cause excessive decarburization, the inventors simply manipulated the oxygen potential value. rather than CaO and Ca
It has been found that a dephosphorizing agent in which the ratio of blending with F is adjusted so that the oxygen potential is also within the range is most effective.
その要旨は、脱燐剤の組成として脱燐剤の重量当たり、
Ａ：固体酸素量（Ｎ ｍ″／ｋｇ）とＢ ： ＣａＯ
＋ＣａＦ２（ｋｇ ／ ｋｇ）との比、即ちＡ／Ｂが０
．１６〜０．１８の範囲で、且ツｃａＯ： ＣａＦ ＝
５＝ １〜３：１の条件を満たした脱燐剤である。The gist is that the composition of the dephosphorizing agent is:
A: Solid oxygen amount (N m″/kg) and B: CaO
+CaF2 (kg/kg) ratio, that is, A/B is 0
．． in the range of 16 to 0.18, and caO: CaF =
It is a dephosphorizing agent that satisfies the condition of 5=1 to 3:1.
「実施例」
本発明の実施を第１図に示す装置で第１表に示す条件を
設定して行った。"Example" The present invention was carried out using the apparatus shown in FIG. 1 under the conditions shown in Table 1.
脱燐剤の添加は、取鍋（１）中の溶銑（２）にインジェ
クション用ランス（３）を浸漬し、該ランスから粉体の
脱燐剤を窒素ガスを搬送ガスとして吹き込み、同時に復
燐防止用および気体脱燐剤として酸素吹き付は用ランス
（４）から溶銑面に酸素ガスガスを吹き付けた。To add the dephosphorizing agent, immerse the injection lance (3) into the hot metal (2) in the ladle (1), blow in the powdered dephosphorizing agent from the lance with nitrogen gas as a carrier gas, and at the same time add the dephosphorizing agent. Oxygen gas was sprayed onto the hot metal surface from a lance (4) for prevention and as a gaseous dephosphorizing agent.
第１表に示す試験条件の下で、脱燐剤組成比Ａ／Ｂを０
．１２〜０．２０にＣａＯとＣａＦとの比率を５：１〜
３；１の間で変化させて試験を行い、その脱Ｓｉ外Ｃａ
Ｏ＋ＣａＦ２原単位（ｋｇ／Ｔ）と脱炭（％）とについ
て第２図に示すような結果が得られた。Under the test conditions shown in Table 1, the dephosphorizing agent composition ratio A/B was 0.
．． The ratio of CaO and CaF is 5:1 to 12 to 0.20.
The test was carried out by varying the ratio between 3 and 1, and the Si-free Ca
The results shown in FIG. 2 were obtained regarding O+CaF2 basic unit (kg/T) and decarburization (%).
脱Ｓｉ外ＣａＯ＋ＣａＦ、原単位とは、 一般に溶銑脱
燐処理においては、脱Ｓｉ反応が脱燐反応に先行するの
で、全脱燐原単位から脱Ｓｉ反応時に消費される原単位
を差し引いた値、即ち脱Ｓｉ外で消費した脱燐剤原単位
のことをいう。 尚、脱Ｓｉ反応時に消費される脱燐原
単位は溶銑中のＳｉ濃度によって求められろ。The basic unit of CaO + CaF for removal of Si is generally the value obtained by subtracting the basic unit consumed during the Si removal reaction from the total dephosphorization basic unit, since the Si removal reaction precedes the dephosphorization reaction in the hot metal dephosphorization process. In other words, it refers to the basic unit of dephosphorizing agent consumed outside of removing Si. Incidentally, the dephosphorization unit consumed during the Si-removal reaction can be determined from the Si concentration in the hot metal.
次に本脱燐剤の効果にって第２図に基づき説明する。先
ず、脱Ｓｉ外ＣａＯ＋ ＣａＦｚ原単位はＡ／Ｂの比が
０．．１６乃至０．１８で低値を示し、それ以下でもそ
れ以上でも高い原単位を示した。一方、脱炭量について
も同様な傾向を示すが、０．１６以下ではその傾向；よ
顕著ではない。Next, the effect of this dephosphorizing agent will be explained based on FIG. 2. First, the basic unit of CaO+ CaFz outside of Si removal is when the ratio of A/B is 0. ．． A value between 16 and 0.18 showed a low value, and both below and above showed a high unit consumption. On the other hand, the amount of decarburization shows a similar tendency, but at 0.16 or less, the tendency is not so pronounced.
これらのことから、脱Ｓｉ外ＣａＯ＋ＣａＦ原単位と脱
炭量について低値を示したＡ／Ｂ比０．１６乃至０．１
８の範囲の脱燐剤組成が最も好ましいことがわかる。From these facts, the A/B ratio of 0.16 to 0.1 showed low values for the basic unit of CaO + CaF outside of Si removal and the amount of decarburization.
It can be seen that a dephosphorizing agent composition in the range of 8 is most preferred.
尚、ＣａとＣａＦとの比を５： １〜３： １に限定し
た理由は、第３図に示す３元系状態図における（％Ｓｉ
Ｏ□）＝２０の場合のスラグ融点を１４５０〜１７５０
０Ｃと下げることにより、脱燐剤の反応性を向上本せ、
かっ、除滓性を向上させろためである。The reason for limiting the ratio of Ca to CaF to 5:1 to 3:1 is because (%Si
When O□)=20, the slag melting point is 1450 to 1750.
By lowering the temperature to 0C, the reactivity of the dephosphorizing agent can be improved.
This is to improve sludge removal performance.
しかし、この３元系状態図は、純粋系であり、前記の様
な高融点温度を示すが、実際操業状態におけろスラグは
、複雑な混合形態であるために、その融点温度は１２０
０〜１３００°Ｃの低温を示す。However, although this ternary system phase diagram is a pure system and shows a high melting point temperature as mentioned above, in actual operating conditions, slag has a complex mixed form, so its melting point temperature is 120
Indicates a low temperature of 0 to 1300°C.
第１表
「発明の効果」
本発明により、最小限のＣａＯ、Ｃａ−によって脱燐が
可能になり、スラグ量の増加もなく、固体酸素の使用減
によって溶銑温度の低下や過剰に脱炭するという問題も
解消できるなど顕著な効果を挙げて゛いる。Table 1 "Effects of the Invention" The present invention makes it possible to dephosphorize with minimal CaO and Ca-, without increasing the amount of slag, and by reducing the use of solid oxygen, there is no need to lower the hot metal temperature or prevent excessive decarburization. It has had remarkable effects, such as being able to solve this problem.
第１図は本発明のために用いた装置の概略であり、第２
図は、脱Ｓｉ外ＣａＯ＋ＣａＦ原単位および脱炭量と脱
燐剤組成（Ａ／Ｂ）の関係図である。
第３図はＣａＦ −ｃａｏ −ＳｉＯ，３元系状態図で
ある。
１：取鍋 ２：溶銑
３：インジェクション用ランス
４：酸素吹き付は用ランスFIG. 1 is a schematic diagram of the apparatus used for the present invention, and FIG.
The figure is a diagram showing the relationship between the basic unit of CaO+CaF outside of Si removal, the amount of decarburization, and the composition of the dephosphorizing agent (A/B). FIG. 3 is a phase diagram of the ternary system CaF-cao-SiO. 1: Ladle 2: Hot metal 3: Lance for injection 4: Lance for oxygen spraying
Claims (1)
ていることを特徴とする溶銑脱燐剤。 Ａ／Ｂ＝０．１６〜０．１８ 但しＡ：固体酸素量（Ｎｍ＾３／ｋｇ） Ｂ：ＣａＯ＋ＣａＦ＿２（ｋｇ／ｋｇ） ＣａＯ：ＣａＦ＿２＝５：１〜３：１[Scope of Claims] A hot metal dephosphorizing agent characterized in that the composition of powder for dephosphorizing phosphorus in hot metal satisfies the following conditions. A/B=0.16-0.18 However, A: Solid oxygen amount (Nm^3/kg) B: CaO+CaF_2 (kg/kg) CaO:CaF_2=5:1-3:1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8282787A JPS63250411A (en) | 1987-04-06 | 1987-04-06 | Dephosphorizing agent for molten pig iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8282787A JPS63250411A (en) | 1987-04-06 | 1987-04-06 | Dephosphorizing agent for molten pig iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63250411A true JPS63250411A (en) | 1988-10-18 |
| JPH0557325B2 JPH0557325B2 (en) | 1993-08-23 |
Family
ID=13785230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8282787A Granted JPS63250411A (en) | 1987-04-06 | 1987-04-06 | Dephosphorizing agent for molten pig iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63250411A (en) |
-
1987
- 1987-04-06 JP JP8282787A patent/JPS63250411A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0557325B2 (en) | 1993-08-23 |
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