JPH04254507A - Method for refining in converter - Google Patents
Method for refining in converterInfo
- Publication number
- JPH04254507A JPH04254507A JP1558791A JP1558791A JPH04254507A JP H04254507 A JPH04254507 A JP H04254507A JP 1558791 A JP1558791 A JP 1558791A JP 1558791 A JP1558791 A JP 1558791A JP H04254507 A JPH04254507 A JP H04254507A
- Authority
- JP
- Japan
- Prior art keywords
- manganese ore
- powder
- converter
- molten steel
- mixed
- 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
- 238000000034 method Methods 0.000 title claims description 19
- 238000007670 refining Methods 0.000 title claims description 6
- 239000011572 manganese Substances 0.000 claims abstract description 46
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011812 mixed powder Substances 0.000 claims abstract description 11
- 239000000292 calcium oxide Substances 0.000 claims abstract description 10
- 235000019738 Limestone Nutrition 0.000 claims abstract description 7
- 239000006028 limestone Substances 0.000 claims abstract description 7
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 3
- 239000001110 calcium chloride Substances 0.000 claims abstract description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 3
- 235000012255 calcium oxide Nutrition 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- NOTVAPJNGZMVSD-UHFFFAOYSA-N potassium monoxide Inorganic materials [K]O[K] NOTVAPJNGZMVSD-UHFFFAOYSA-N 0.000 claims description 3
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Inorganic materials [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 3
- 235000011148 calcium chloride Nutrition 0.000 claims description 2
- 229910011255 B2O3 Inorganic materials 0.000 claims 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims 1
- 238000007664 blowing Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 14
- 238000002156 mixing Methods 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 7
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical class [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract 1
- 235000011941 Tilia x europaea Nutrition 0.000 abstract 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 239000004571 lime Substances 0.000 abstract 1
- 239000000395 magnesium oxide Substances 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract 1
- 229910001948 sodium oxide Inorganic materials 0.000 abstract 1
- 238000002844 melting Methods 0.000 description 13
- 230000008018 melting Effects 0.000 description 13
- 239000002893 slag Substances 0.000 description 11
- 239000000654 additive Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000007654 immersion Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 101100083507 Caenorhabditis elegans acl-2 gene Proteins 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- MOWNZPNSYMGTMD-UHFFFAOYSA-N boron monoxide Inorganic materials O=[B] MOWNZPNSYMGTMD-UHFFFAOYSA-N 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、転炉の精錬方法に関し
、具体的には、例えば溶銑予備処理にて燐を除去した溶
銑を転炉内で脱炭精錬する際に、溶鋼中のＭｎ濃度を高
めるためのマンガン鉱石（本発明では、Ｍｎ含有率３０
％以上のマンガン鉱石及び鉄マンガン鉱石を言う）の添
加方法に関するものである。[Field of Industrial Application] The present invention relates to a refining method for a converter, and specifically, for example, when hot metal from which phosphorus has been removed in hot metal pretreatment is decarburized and refined in a converter, Mn in the molten steel is Manganese ore to increase the concentration (in the present invention, Mn content 30
% or more of manganese ore and ferromanganese ore).
【０００２】0002
【従来の技術】近年、溶銑予備処理技術の発展と共に、
転炉における吹錬はレススラグ吹錬が主流になっている
。この中で、溶鋼へのＭｎの添加方法は、従来行われて
いた吹錬終了後に高価なＦｅ−Ｍｎ系合金を使う方法に
代わって、レススラグ吹錬中に安価なマンガン鉱石を投
入して溶融還元を行う方法が一般的となってきた。しか
し、マンガン鉱石が高融点であるため、反応性を高める
ための方策が必要であり、その１つの例として特開平１
−１４２０１１号公報に見られるようなマンガン鉱石粉
を主成分とした小団塊を上方から投入する方法が提案さ
れている。[Prior Art] In recent years, with the development of hot metal pretreatment technology,
The mainstream of blowing in converters is non-slag blowing. Among these, the method of adding Mn to molten steel is to add inexpensive manganese ore to the molten steel during less slag blowing, instead of the conventional method of using an expensive Fe-Mn alloy after blowing. Reduction methods have become common. However, since manganese ore has a high melting point, it is necessary to take measures to increase the reactivity, and one example of this is
A method has been proposed in which small nodules mainly composed of manganese ore powder are introduced from above, as seen in Japanese Patent No. 142011.
【０００３】0003
【発明が解決しようとする課題】特開平１−１４２０１
１号公報で示されている方法は、マンガン鉱石粉を主成
分とした粉体を小団塊にする工程が増えること、またそ
れによるコストがかかることが問題であるのに加えて、
この方法では上方から投入することになるため溶鋼への
直接添加が出来ず、炉内のスラグ上に添加される形とな
りスラグへの溶解過程が必要となるだけ反応が遅れると
いう反応上の基本的な問題も含んでいる。そこで、マン
ガン鉱石粉体の事前処理工程を必要とせず、かつ溶鋼と
の直接反応が可能な方法が強く望まれていた。[Problem to be solved by the invention] JP-A-1-14201
The method shown in Publication No. 1 has the problem of increasing the step of turning the powder mainly composed of manganese ore powder into small agglomerates, and the resulting cost.
In this method, it is added from above, so it cannot be added directly to the molten steel, but it is added to the slag in the furnace, and the reaction is delayed by the process of melting into the slag. It also includes problems. Therefore, a method that does not require a pretreatment process of manganese ore powder and allows direct reaction with molten steel has been strongly desired.
【０００４】0004
【課題を解決するための手段】本発明の要旨とするとこ
ろは下記のとおりである。
（１） 溶銑を転炉で脱炭精錬を行う際、マンガン鉱
石の粉体と、生石灰または石灰石の粉体のいずれか１種
もしくは２種とを混合して、ＣａＯ（配合ＣａＯ分と鉱
石中ＣａＯ分の合計）とマンガン鉱石中のＭｎ−Ｏｘｉ
ｄｅ（ＭｎＯ換算）の重量比を０．２〜０．７にしたも
のを、溶鋼温度が１４５０℃以上となった段階で溶鋼内
に吹き込むことを特徴とする転炉の精錬方法。[Means for Solving the Problems] The gist of the present invention is as follows. (1) When hot metal is decarburized and refined in a converter, manganese ore powder is mixed with one or both of quicklime and limestone powder, and CaO (blended CaO content and ore content) is mixed. total CaO content) and Mn-Oxi in manganese ore
A converter refining method characterized in that de (in terms of MnO) is injected into molten steel at a weight ratio of 0.2 to 0.7 when the molten steel temperature reaches 1450°C or higher.
【０００５】（２） マンガン鉱石の粉体と生石灰ま
たは石灰石の粉体のいずれか１種もしくは２種との混合
粉体１００重量部に対して、Ｎａ２ Ｏ，ＮａＣｌ，Ｎ
ａＦ，Ｋ２ Ｏ，ＣａＦ２ ，ＣａＣｌ２ ，Ｂ２ Ｏ
３ のいずれか１種もしくは２種以上を、その合計で０
．３〜５．０重量％配合して吹き込むことを特徴とする
前項１記載の転炉の精錬方法。(2) Na2O, NaCl, N to 100 parts by weight of a mixed powder of manganese ore powder and one or two of quicklime or limestone powder.
aF, K2O, CaF2, CaCl2, B2O
3 Any one or two or more of the following, total of 0
．． The method for refining a converter according to item 1 above, characterized in that 3 to 5.0% by weight is mixed and blown into the converter.
【０００６】[0006]
【作用】次に、作用について述べる。本発明者らは、マ
ンガン鉱石の粉体をそのままで使用する方法として、溶
鋼に直接吹き込むことを考えた。すなわち、粉体のまま
では上方から投入しても排ガス系に吸引されて溶鋼への
添加が有効に行えないので、マンガン鉱石粉を浴内にイ
ンジェクションする方法を検討した。しかしながら、前
述したようにマンガン鉱石の融点は１５００℃以上の高
温であるため、そのままでは溶解が充分進まず反応は期
待出来ない。[Effect] Next, the effect will be described. The present inventors considered a method for using manganese ore powder as it is by directly blowing it into molten steel. That is, even if the manganese ore powder is injected from above, it will be sucked into the exhaust gas system and cannot be effectively added to the molten steel, so a method of injecting manganese ore powder into the bath was investigated. However, as mentioned above, the melting point of manganese ore is a high temperature of 1500° C. or higher, so if it is left as it is, the melting will not proceed sufficiently and no reaction can be expected.
【０００７】そこで、マンガン鉱石の融点を低下させる
ための添加剤が必要であるが、その際、融点が低下して
もＭｎＯが不活性化する（ＭｎＯの活量が低下する）等
の化学的特性を基本的に悪化させるものを添加したので
は逆効果となる。本発明者らは、これらの観点から種々
の酸化物を配合して実験を重ねた結果、ＣａＯ分を混合
すると、化学的特性を損なうことなく（むしろＭｎＯの
活量を増加する）融点を低下することが可能であること
を明らかにして、実際吹錬へ適用した結果、大きな還元
率向上効果が得られることを突き止めた。[0007] Therefore, additives are needed to lower the melting point of manganese ore, but in this case, chemical additives such as inactivation of MnO (lowering of MnO activity) even if the melting point is lowered are necessary. Adding something that basically deteriorates the properties will have the opposite effect. As a result of repeated experiments with blending various oxides from these viewpoints, the present inventors found that when CaO is mixed, the melting point is lowered without impairing the chemical properties (rather, it increases the activity of MnO). As a result of applying it to actual blowing, we found that a large reduction rate improvement effect could be obtained.
【０００８】図１は、マンガン鉱石粉にＣａＯ粉を配合
したときの融点の変化を測定した結果および各々の配合
条件でこれらの粉体を転炉内溶鋼に吹き込んだ場合のＭ
ｎ還元率を示した図であるが、図から明らかなようにＣ
ａＯとＭｎＯの重量比が０．２〜０．７の範囲で融点が
大幅に低下し、この範囲にＣａＯ分の配合を調整して転
炉内溶鋼にマンガン鉱石粉を吹き込んだ時はＭｎ還元率
が極めて高い値を示す。Figure 1 shows the results of measuring the change in melting point when CaO powder is blended with manganese ore powder, and the M when these powders are blown into molten steel in a converter under each blending condition.
This is a diagram showing the n reduction rate, and as is clear from the diagram, C
The melting point drops significantly when the weight ratio of aO and MnO is in the range of 0.2 to 0.7, and when the CaO content is adjusted to this range and manganese ore powder is injected into the molten steel in the converter, Mn reduction occurs. The ratio is extremely high.
【０００９】しかしながら、マンガン鉱石とＣａＯ分を
上記適正範囲に配合調整しても、図２に示すように、添
加時期を溶鋼温度が１４５０℃以上の吹錬後半に添加し
なければ、その効果は有効に発揮出来ない。これは、浴
内に添加されて直ちに溶解するためには、浴温が混合粉
体の融点より高くなければならないからである。もし、
融点以下の低温条件で吹き込んだ場合は、溶鋼内での直
接反応が期待出来ず、結局上方投入と同じように一旦ス
ラグに溶解した後に反応する形となる。However, even if the mixture of manganese ore and CaO content is adjusted to the above-mentioned appropriate range, the effect will be low unless it is added in the latter half of blowing when the molten steel temperature is 1450°C or higher, as shown in Figure 2. Unable to perform effectively. This is because the bath temperature must be higher than the melting point of the mixed powder in order for it to dissolve immediately after being added to the bath. if,
If it is blown into the molten steel at a low temperature below its melting point, a direct reaction within the molten steel cannot be expected, and as with upward injection, the reaction will occur after it has been dissolved into slag.
【００１０】また図３に示すように、粉体の配合条件と
添加時期を上記適正範囲に調整した上で、混合粉体にＮ
ａ２ Ｏ，ＮａＣｌ，ＮａＦ，Ｋ２Ｏ，ＣａＦ２ ，Ｃ
ａＣｌ２ ，Ｂ２ Ｏ３のいずれか１種または２種以上
の合計が０．３〜５．０重量％になるように配合するこ
とにより、還元促進効果が更に助長される。これは、こ
れら添加剤による混合粉体の融点の更なる低下をもたら
すためである。[0010] Furthermore, as shown in Fig. 3, after adjusting the blending conditions and addition timing of the powder to the above-mentioned appropriate range, N is added to the mixed powder.
a2 O, NaCl, NaF, K2O, CaF2, C
By blending one or more of aCl2 and B2 O3 in a total amount of 0.3 to 5.0% by weight, the reduction promoting effect is further promoted. This is because these additives further lower the melting point of the mixed powder.
【００１１】尚、配合するＣａＯ源としては、生石灰を
用いても石灰石を用いても同等の効果が得られるし、粉
体の溶鋼への吹き込み方法としては、上吹きランスを用
いたブラスティング法でもよいし、浸漬羽口からの底吹
き、横吹き、或いは浸漬ランスのインジェクションでも
かまわない。本発明によれば、従来の上方からスラグに
添加する方式で問題となっていたマンガン鉱石大量投入
時のスロッピングによる操業上の制約がないため、対象
とする溶銑はあらかじめ脱燐および／または脱硫、脱珪
等の予備処理をしたものに限らず（すなわち、スラグ量
の如何に関らず）全ての溶銑に適用できる。[0011] As for the CaO source to be mixed, the same effect can be obtained by using quicklime or limestone, and the method for blowing powder into molten steel is the blasting method using a top blowing lance. Alternatively, bottom blowing, side blowing from an immersion tuyere, or injection using an immersion lance may be used. According to the present invention, there is no operational restriction due to slopping when adding a large amount of manganese ore, which was a problem with the conventional method of adding manganese ore from above, so the target hot metal is dephosphorized and/or desulfurized in advance. This method can be applied to all types of hot metal, not only those that have undergone preliminary treatment such as desiliconization (that is, regardless of the amount of slag).
【００１２】本発明におけるマンガン還元の反応サイト
は浴内浮上中の粉体表面が主体であるが、一部はトップ
スラグにトラップされた後の反応も生じるため、本発明
においてもスラグ量が少ないほどスラグへのロスが減少
し、効果が増大することは言うまでもない。したがって
、予備処理を施した溶銑では特に顕著な効果が得られる
。[0012] The reaction site for manganese reduction in the present invention is mainly on the surface of the powder floating in the bath, but some reaction occurs after being trapped in the top slag, so the amount of slag is small in the present invention as well. It goes without saying that the more the slag loss is reduced, the more the effect is increased. Therefore, particularly remarkable effects can be obtained with pretreated hot metal.
【００１３】[0013]
【実施例】１．マンガン鉱石を含む添加物の配合条件（
表１〜表３に記載）
２．転炉吹錬における操業条件とＭｎ歩留（表１〜表３
に記載）
ただし、本実施例において溶銑は予備処理にて脱燐した
もので、転炉に装入した時点のスラグ量は各例２５〜２
９ｋｇ／Ｔ−Ｓｔｅｅｌ である。[Example] 1. Mixing conditions for additives containing manganese ore (
(described in Tables 1 to 3) 2. Operating conditions and Mn yield in converter blowing (Tables 1 to 3
However, in this example, the hot metal was dephosphorized in the preliminary treatment, and the amount of slag at the time of charging into the converter was 25 to 2 in each example.
9kg/T-Steel.
【００１４】また、粉状のマンガン鉱石と生石灰または
石灰石の混合粉体は、転炉底部の２重管羽口の外側から
Ｎ２ ガスをキャリヤーガスとして浴中に吹き込んだ。
この吹き込み中、２重管羽口の内部からの底吹き用酸素
ガスをＮ２ ガスに切り替えた。[0014] The mixed powder of powdered manganese ore and quicklime or limestone was blown into the bath from the outside of the double-tube tuyere at the bottom of the converter using N2 gas as a carrier gas. During this blowing, the bottom blowing oxygen gas from inside the double tube tuyere was switched to N2 gas.
【００１５】[0015]
【表１】[Table 1]
【００１６】[0016]
【表２】[Table 2]
【００１７】[0017]
【表３】[Table 3]
【００１８】[0018]
【発明の効果】本発明に従い、転炉でのレススラグ吹錬
時に高いＭｎ歩留を得るためのマンガン鉱石とＣａＯ分
および特殊添加剤の配合条件と添加時期を特定すること
により、前記課題の転炉における低Ｍｎ歩留を解消して
、従来のＦｅ−Ｍｎ系合金を使用する方法より格段に製
造コストを低減することができるので、本発明がこの種
の産業分野にもたらす効果は極めて大きい。Effects of the Invention According to the present invention, the above problem can be solved by specifying the mixing conditions and addition timing of manganese ore, CaO content, and special additives to obtain a high Mn yield during less slag blowing in a converter. Since the low Mn yield in the furnace can be solved and the manufacturing cost can be significantly reduced compared to the conventional method using Fe--Mn alloy, the present invention has an extremely large effect on this type of industrial field.
【図１】図１はマンガン鉱石とＣａＯの混合粉体の融点
に及ぼすＣａＯとマンガン鉱石中のＭｎＯの重量比の影
響と、これらの粉体を転炉内溶鋼に吹き込んだ時のＭｎ
歩留に及ぼすＣａＯとマンガン鉱石中のＭｎＯの重量比
の影響を同時に示したものである。[Figure 1] Figure 1 shows the influence of the weight ratio of CaO and MnO in the manganese ore on the melting point of mixed powder of manganese ore and CaO, and the influence of Mn when these powders are blown into molten steel in a converter.
This figure simultaneously shows the influence of the weight ratio of CaO and MnO in manganese ore on the yield.
【図２】図２はマンガン鉱石とＣａＯの混合粉体を吹き
込むときの溶鋼温度とＭｎ歩留の関係を示す図である。FIG. 2 is a diagram showing the relationship between molten steel temperature and Mn yield when a mixed powder of manganese ore and CaO is injected.
【図３】図３はマンガン鉱石とＣａＯの混合粉体への特
殊添加剤の配合効果を示す図である。FIG. 3 is a diagram showing the effect of adding special additives to a mixed powder of manganese ore and CaO.
Claims (2)
ガン鉱石の粉体と、生石灰または石灰石の粉体のいずれ
か１種もしくは２種とを混合して、ＣａＯ（配合ＣａＯ
分と鉱石中ＣａＯ分の合計）とマンガン鉱石中のＭｎ−
Ｏｘｉｄｅ（ＭｎＯ換算）の重量比を０．２〜０．７に
したものを、溶鋼温度が１４５０℃以上となった段階で
溶鋼内に吹き込むことを特徴とする転炉の精錬方法。Claim 1: When decarburizing hot metal in a converter, manganese ore powder and one or two of quicklime or limestone powder are mixed to form CaO (compounded CaO).
and the sum of the CaO content in the ore) and the Mn− in the manganese ore.
A converter refining method characterized by injecting oxide (in terms of MnO) at a weight ratio of 0.2 to 0.7 into molten steel when the molten steel temperature reaches 1450°C or higher.
灰石の粉体のいずれか１種もしくは２種との混合粉体１
００重量部に対して、Ｎａ２ Ｏ，ＮａＣｌ，ＮａＦ，
Ｋ２ Ｏ，ＣａＦ２ ，ＣａＣｌ２ ，Ｂ２ Ｏ３ の
いずれか１種もしくは２種以上を、その合計で０．３〜
５．０重量％配合して吹き込むことを特徴とする請求項
１記載の転炉の精錬方法。[Claim 2] Mixed powder 1 of manganese ore powder and either one or two of quicklime or limestone powder.
00 parts by weight, Na2O, NaCl, NaF,
Any one or two or more of K2O, CaF2, CaCl2, B2O3 in a total amount of 0.3~
2. The converter refining method according to claim 1, wherein 5.0% by weight is mixed and blown into the converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1558791A JP2899993B2 (en) | 1991-02-06 | 1991-02-06 | Converter refining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1558791A JP2899993B2 (en) | 1991-02-06 | 1991-02-06 | Converter refining method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04254507A true JPH04254507A (en) | 1992-09-09 |
| JP2899993B2 JP2899993B2 (en) | 1999-06-02 |
Family
ID=11892864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1558791A Expired - Fee Related JP2899993B2 (en) | 1991-02-06 | 1991-02-06 | Converter refining method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2899993B2 (en) |
-
1991
- 1991-02-06 JP JP1558791A patent/JP2899993B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2899993B2 (en) | 1999-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3239308A1 (en) | Method for reclaiming iron and phosphorus from steelmaking slag | |
| JP3503176B2 (en) | Hot metal dephosphorizer for injection | |
| JP4765374B2 (en) | Desulfurization treatment method for chromium-containing hot metal | |
| JP2958848B2 (en) | Hot metal dephosphorization method | |
| JP3733689B2 (en) | Hot metal desulfurization method | |
| JP2896839B2 (en) | Molten steel manufacturing method | |
| JP3525766B2 (en) | Hot metal dephosphorization method | |
| JPH04254507A (en) | Method for refining in converter | |
| JPH07278644A (en) | Dephosphorizing method of high chrome and high manganese molten alloy iron | |
| EP1457574A1 (en) | Method for pretreatment of molten iron and method for refining | |
| JP3653405B2 (en) | Dephosphorizing agent and dephosphorizing method excellent in hot metal dephosphorizing ability | |
| JP3239722B2 (en) | Hot metal pretreatment method | |
| JP3508550B2 (en) | Hot metal desulfurization method | |
| JP2587286B2 (en) | Steelmaking method | |
| JPH111714A (en) | Steelmaking method | |
| JP3345622B2 (en) | Hot metal pretreatment method | |
| JP2002275521A (en) | Method for dephosphorizing molten high carbon steel | |
| JPS6121285B2 (en) | ||
| JPS61201712A (en) | Pretreatment of molten pig iron | |
| JP2856106B2 (en) | Hot metal desulfurization method | |
| JP2004204307A (en) | Desulfurizing agent for molten steel | |
| JPH10158715A (en) | Method for reducing manganese ore in converter | |
| JP2002275520A (en) | Method for refining molten high carbon steel | |
| JPH10130711A (en) | Turn down operation with high mn yield in converter | |
| JP2002212615A (en) | Method for dephosphorizing molten iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990119 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080319 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090319 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090319 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100319 Year of fee payment: 11 |
|
| LAPS | Cancellation because of no payment of annual fees |