JPH07188728A - Desulfurizing agent for molten steel - Google Patents
Desulfurizing agent for molten steelInfo
- Publication number
- JPH07188728A JPH07188728A JP33591293A JP33591293A JPH07188728A JP H07188728 A JPH07188728 A JP H07188728A JP 33591293 A JP33591293 A JP 33591293A JP 33591293 A JP33591293 A JP 33591293A JP H07188728 A JPH07188728 A JP H07188728A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- desulfurizing agent
- cao
- steel
- desulfurizing
- 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.)
- Withdrawn
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶鋼の脱硫剤に関し、
特に溶鋼を２次精錬して低硫鋼を製造する際に用いる脱
硫剤に関する。TECHNICAL FIELD The present invention relates to a desulfurizing agent for molten steel,
In particular, it relates to a desulfurizing agent used when secondary refining molten steel to produce low-sulfur steel.
【０００２】[0002]
【従来の技術】一般に、耐ＨＩＣ鋼やホイールディスク
材用低硫鋼等を製造するには、溶銑段階での脱硫のみで
は、転炉スラグからの復硫や添加する合金鉄中に含まれ
ている硫黄分からの溶鋼［％Ｓ］の上昇があり、溶鋼の
目標［％Ｓ］スペックを満足することが不可能である。
そのため、転炉等からの出鋼後に溶鋼段階での脱硫が必
須となり、通常、ＬＦ（Ｌａｄｌｅ Ｆｕｒｎａｃｅ）
法、ＦＩ（Ｆｌｕｘ Ｉｎｊｅｃｔｉｏｎ）法、あるい
はＲＨ真空脱ガス法等の２次精錬を行い、その過程で脱
硫されている。2. Description of the Related Art Generally, in order to produce HIC-resistant steel, low-sulfur steel for wheel disc materials, etc., only desulfurization at the hot metal stage is involved in re-sulfurization from converter slag and added ferroalloys. There is an increase in molten steel [% S] from the sulfur content, and it is impossible to meet the target [% S] specifications for molten steel.
Therefore, desulfurization at the molten steel stage is essential after tapping from a converter, etc., and normally LF (Ladle Furnace) is required.
Method, FI (Flux Injection) method, RH vacuum degassing method, or other secondary refining is performed, and in the process, it is desulfurized.
【０００３】これら２次精錬技術のなかでも、プロセス
が単純、コストが比較的に少なくてすむとの理由で、Ｒ
Ｈ真空脱ガス時での脱硫（以下、ＲＨ脱硫法という）が
近年特に注目されている。このＲＨ脱硫法は、例えば特
開昭６３−１１４９１８号公報に開示されたように、Ｒ
Ｈ真空脱ガス装置内の鋼浴面上に、その側壁から傾斜し
たノズルを介して、蛍石含有率５〜２０重量％、生石灰
含有率８０〜９５重量％である生石灰−蛍石系脱硫黄剤
を所定量、不活性ガスをキャリアガスとして吹きつける
方法、特公平３−６１７２１号公報に開示されたよう
に、ＲＨ真空脱ガス装置の鋼浴中に直接ランスを装入し
て、ＣａＯ，ＣａＦ2 ，ＭｇＯと、その他不可避不純物
からなる脱硫剤を吹込む方法、あるいは単にホッパーか
ら脱硫剤を真空層内溶鋼に吹き付ける方法、最近ではＲ
Ｈ真空脱ガス装置の直上に上吹きランスを設けて、それ
を介して脱硫剤を鋼浴面に吹きつける方法などがある。
なお、これらの方法では、一般に脱硫剤の形状は、微粉
（１００メッシュアンダーなど）混合物やプリメルトし
た塊状粉体などが用いられる。Among these secondary refining techniques, R is used because of its simple process and relatively low cost.
In recent years, desulfurization during H-vacuum degassing (hereinafter referred to as RH desulfurization method) has attracted particular attention. This RH desulfurization method is disclosed in Japanese Patent Application Laid-Open No. 63-114918, for example.
H Quick lime-fluorite-based desulfurization with a fluorite content of 5 to 20 wt% and a quick lime content of 80 to 95 wt% on a steel bath surface in a vacuum degasser through a nozzle inclined from its side wall. As disclosed in Japanese Patent Publication No. 3-61721, a method of spraying a predetermined amount of an agent with an inert gas as a carrier gas, a lance is directly charged into a steel bath of an RH vacuum degassing apparatus, and CaO, A method of blowing a desulfurizing agent containing CaF 2 , MgO and other unavoidable impurities, or a method of simply blowing a desulfurizing agent from a hopper onto molten steel in a vacuum layer.
There is a method in which an upper blowing lance is provided directly above the H vacuum degassing apparatus, and the desulfurizing agent is blown onto the steel bath surface via the upper blowing lance.
In these methods, the desulfurizing agent is generally used in the form of a fine powder (100 mesh under, etc.) mixture or pre-melted lump powder.
【０００４】しかしながら、特開昭６３−１１４９１８
号公報や、特公平３−６１７２１号公報に記載の方法で
は、脱硫剤吹込用のノズルやランスを高温雰囲気にさら
したり、溶鋼内に浸漬させるために、それらノズルやラ
ンスのメンテナンスに、手間やコストが掛かり不利であ
る。また、ＲＨ真空脱ガス装置上のホッパから脱硫剤を
直接添加する方法では、方法そのものは容易であるが、
一般に脱硫剤として塊状物を用いるために反応性が悪
く、脱硫の効果はさほど期待できない。さらに、ＲＨ真
空脱ガス装置に上吹き用ランスを設け、それを介して脱
硫剤を鋼浴面に吹き付ける方法もあるが、その方法で脱
硫剤として粉体を用いた場合には、脱硫剤が真空排気系
に吸引されて脱硫剤の使用歩留りが低下し、かえって脱
硫が期待できないという問題もある。However, JP-A-63-114918
In the method described in Japanese Patent Publication No. 3-61721 or Japanese Patent Publication No. 3-61721, the nozzles and lances for blowing the desulfurizing agent are exposed to a high temperature atmosphere or immersed in the molten steel. It is costly and disadvantageous. Further, in the method of directly adding the desulfurizing agent from the hopper on the RH vacuum degassing apparatus, the method itself is easy,
Generally, since a lump is used as a desulfurizing agent, the reactivity is poor and the effect of desulfurization cannot be expected so much. Further, there is also a method in which an upper blowing lance is provided in the RH vacuum degassing apparatus and a desulfurizing agent is sprayed onto the steel bath surface through the lance, but when powder is used as the desulfurizing agent in this method, the desulfurizing agent is There is also a problem that the yield of use of the desulfurizing agent is reduced by being sucked into the vacuum exhaust system and conversely desulfurization cannot be expected.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、前記した問
題点を解決するため、真空脱ガス装置内で使用しても反
応性が大で、且つ使用歩留の高い溶鋼の脱硫剤を提供す
ることを目的としている。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a desulfurizing agent for molten steel which is highly reactive even when used in a vacuum degassing apparatus and has a high yield. The purpose is to do.
【０００６】[0006]
【課題を解決するための手段】発明者は、上記目的を達
成するために、実験、研究を繰り返し、脱硫剤をガス発
生物質を含むブリケット状のものを用いれば、ハンドリ
ングや鋼浴への装入が容易で、使用歩留が向上し、溶鋼
と接触した時には崩壊して微粉状態になり、反応性が高
くなることを確認した。本発明は、この確認事項を具現
化したもので、ＣａＯを主体とする粉状脱硫剤、金属炭
酸化物からなる粉状ガス発生物質及び脱酸力を有する金
属粉末の一定割合の均一混合物からなり、粒度が１ｍｍ
以上のブリケットであることを特徴とする溶鋼の脱硫剤
である。また、本発明は、脱酸力を有する金属粉末の配
合量を、金属炭酸化物からの発生酸素当量を酸化する量
としたことを特徴とする請求項１記載の溶鋼の脱硫剤で
あり、好ましい態様として、本発明は、金属炭酸化物が
ＣａＣＯ3 又は／及びＭｇＣＯ3 ，脱酸力を有する金属
がＡｌであることを特徴とする請求項２記載の溶鋼の脱
硫剤である。In order to achieve the above-mentioned object, the inventor has repeated experiments and studies, and if a desulfurizing agent in the form of a briquette containing a gas generating substance is used, the handling and the attachment to a steel bath are carried out. It was confirmed that it is easy to put in, the yield of use is improved, and when it comes into contact with molten steel, it collapses into a fine powder state and its reactivity becomes high. The present invention embodies these confirmation items, and comprises a powdery desulfurizing agent mainly composed of CaO, a powdery gas generating substance composed of a metal carbonate, and a uniform mixture of a metal powder having a deoxidizing power in a predetermined ratio. , Grain size is 1mm
It is a desulfurizing agent for molten steel, which is the above-mentioned briquette. Further, the present invention is the desulfurizing agent for molten steel according to claim 1, characterized in that the compounding amount of the metal powder having deoxidizing power is an amount that oxidizes the oxygen equivalent generated from the metal carbonate. As an aspect, the present invention is the desulfurizing agent for molten steel according to claim 2, wherein the metal carbonate is CaCO 3 or / and MgCO 3 , and the metal having a deoxidizing power is Al.
【０００７】この場合、ブリケットは、円板、球、長方
体、正方体等いかなる形状であっても良い。In this case, the briquette may have any shape such as a disc, a sphere, a rectangular parallelepiped or a rectangular parallelepiped.
【０００８】[0008]
【作用】本発明では、脱硫剤の主体を粉状ＣａＯ系脱硫
剤とし、それに粉状のＭｇＣＯ 3 、ＣａＣＯ3 等のガス
発生物質及び脱酸力を有する粉状の金属Ａｌ，Ｔｉを混
合してブリケット状に圧縮成形したので、鋼浴面へ投入
する程度では破壊しない強度になり、溶鋼での該脱硫剤
の使用歩留りは高くなる。また、本発明では、脱硫剤が
溶鋼中に侵入した際には、ＣａＣＯ3 、ＭｇＣＯ3 等の
ガス発生物質が分解し、ガスを発生するため、ブリケッ
トが分解して微粉となり、反応性が著しく向上するよう
になる。In the present invention, the main component of the desulfurizing agent is powdery CaO-based desulfurizing agent.
Agent and powdered MgCO 3 , CaCO3 Gas of etc.
Mixing the generated substance and powdery metal Al and Ti with deoxidizing power
Combined and compression molded into a briquette, put it on the steel bath surface
The strength of the steel will not be destroyed if it is
The use yield of is high. Further, in the present invention, the desulfurizing agent is
When invading molten steel, CaCO3 , MgCO3 Etc.
The gas generating substance decomposes and generates gas,
So that the resin decomposes into fine powder and the reactivity is significantly improved.
become.
【０００９】以下、本発明に係る脱硫剤にガス発生物質
及び脱酸力を有する金属の役割を説明する。ガス発生物
質としてＣａＣＯ3 ，ＭｇＣＯ3 を使用すると、これら
は溶鋼と接触して昇温し、（１）及び（２）式により分
解する。 ＣａＣＯ3 ＝ＣａＯ＋ＣＯ↑＋Ｏ…（１） ＭｇＣＯ3 ＝ＭｇＯ＋ＣＯ↑＋Ｏ…（２） ここで、反応生成物ＣａＯ，ＭｇＯは脱硫剤となり、Ｃ
Ｏガスは鋼浴の撹拌に寄与して脱硫反応を促進させる。
ところが、上記反応では酸素Ｏも発生し、それは、下記
（３）に示す脱硫反応で明らかなように、（３）式を左
向きに進行させるので、むしろ脱硫を妨げるものとなり
得る。The roles of the gas generating substance and the metal having a deoxidizing power in the desulfurizing agent according to the present invention will be described below. When CaCO 3 or MgCO 3 is used as the gas generating substance, these are brought into contact with the molten steel to raise the temperature and decompose by the equations (1) and (2). CaCO 3 = CaO + CO ↑ + O ... (1) MgCO 3 = MgO + CO ↑ + O ... (2) Here, the reaction products CaO and MgO serve as desulfurizing agents, and C
The O gas contributes to the stirring of the steel bath and accelerates the desulfurization reaction.
However, oxygen O is also generated in the above reaction, and as it is apparent in the desulfurization reaction shown in (3) below, the formula (3) proceeds to the left, which may rather hinder desulfurization.
【００１０】ＣａＯ＋Ｓ＝ＣａＳ＋Ｏ・・・（３） しかし、本発明では混合粉中に脱酸力のある金属として
Ａｌをも含ませてあるので、それが脱酸剤として働き
（（４）式）、上記脱硫阻害を防止する。 ２Ａｌ＋３Ｏ＝Ａｌ2 Ｏ3 …（４） つまり、以上のことをまとめると、（１）、（４）式よ
り（５）式が成り立ち、生成したＣａＯは脱硫反応に寄
与する。CaO + S = CaS + O (3) However, in the present invention, since the mixed powder also contains Al as a metal having a deoxidizing power, it functions as a deoxidizing agent (equation (4)). , Prevent the above desulfurization inhibition. 2Al + 3O = Al 2 O 3 (4) In other words, if the above is summarized, the formula (5) is established from the formulas (1) and (4), and the generated CaO contributes to the desulfurization reaction.
【００１１】 ３ＣａＣＯ3 ＋２Ａｌ＝３ＣａＯ＋Ａｌ2 Ｏ3 ＋３ＣＯ↑ …（５） また、同じく生成したＡｌ2 Ｏ3 は、ＣａＯと結合して
低融点化合物を作るためさらに脱硫効率を向上させるの
に役立つのである。なお、このとき脱粒剤中のＡｌ分は
（５）式からモル比でＡｌ／ＣａＣＯ3 ≧２／３が必要
となる（重量比でＡｌ／ＣａＣＯ3 ≧０．１８）。ま
た、本発明に係る脱硫剤の成形方法は、粉体を圧縮成形
（圧縮は人力、機械力、油圧等）する公知技術を利用す
れば良い。ブリケットの形状は特定しないが、大きさは
粒度で１ｍｍ以上とする。１ｍｍ以下であると、脱硫剤
は真空脱ガス装置から飛散し易く、それを防止するため
である。3CaCO 3 + 2Al = 3CaO + Al 2 O 3 + 3CO ↑ (5) Also, Al 2 O 3 produced in the same manner is combined with CaO to form a low melting point compound, which helps to further improve the desulfurization efficiency. . At this time, the Al content in the granulating agent needs to be Al / CaCO 3 ≧ 2/3 in terms of molar ratio from the formula (5) (Al / CaCO 3 ≧ 0.18 in weight ratio). The desulfurizing agent molding method according to the present invention may utilize a known technique of compression molding powder (compression is manual force, mechanical force, hydraulic pressure, etc.). The shape of the briquette is not specified, but the size is 1 mm or more in terms of grain size. When the thickness is 1 mm or less, the desulfurizing agent is easily scattered from the vacuum degassing device, and is for preventing it.
【００１２】[0012]
実施例１ 転炉にて脱炭精錬した溶鋼は、出鋼中に成分調整し、図
１に示すＲＨ真空脱ガス装置にて処理された。ＲＨ真空
脱ガス処理前の溶鋼組成は、［％Ｃ］＝０．０５〜０．
０８％、［％Ｓｉ］＝ｔｒａｃｅ〜０．３０％、［％Ｍ
ｎ］＝１．０〜１．５、［％Ａｌ］＝０．０３０〜０．
０６０％であり、溶鋼温度は１６００〜１６１０℃であ
った。また、脱硫前処理としてスラグ還元剤を取鍋中の
溶鋼に投入してスラグ改質を施してある。Example 1 Molten steel decarburized and refined in a converter was adjusted in composition during tapping, and treated by an RH vacuum degassing apparatus shown in FIG. The composition of the molten steel before the RH vacuum degassing treatment is [% C] = 0.05-0.
08%, [% Si] = trace˜0.30%, [% M
n] = 1.0-1.5, [% Al] = 0.030-0.
It was 060% and the molten steel temperature was 1600 to 1610 ° C. As a desulfurization pretreatment, a slag reducing agent is added to the molten steel in the ladle for slag modification.
【００１３】上記処理開始２分経過後から、図１のＡに
示す合金鉄添加装置を利用して本発明に係る脱硫剤を４
〜５分間投入した。その添加量は、８〜１０ｋｇ／ｔ−
ｓｔｅｅｌである。使用した脱硫剤の内容を表１の
（１）に示す。なお、ブリケットの見掛け密度は１．３
ｋｇ／ｍ3 であった。After the lapse of 2 minutes from the start of the above treatment, the desulfurization agent according to the present invention was added to
Put on for ~ 5 minutes. The addition amount is 8 to 10 kg / t-
It is steel. The contents of the desulfurizing agent used are shown in Table 1 (1). The apparent density of briquette is 1.3.
It was kg / m 3 .
【００１４】[0014]
【表１】 [Table 1]
【００１５】この処理での代表的な脱硫挙動を図２に、
また、図３には脱硫剤原単位と脱硫率の関係を示す。こ
こで、 脱硫剤（％）＝（処理前［％Ｓ］−処理後［％Ｓ］）／
処理前［％Ｓ］×１００ 図２から、本発明の脱硫剤は、処理開始時の溶鋼中［％
Ｓ］が３０ｐｐｍであれば、１５ｐｐｍまで脱硫が可能
で、十分に脱硫剤として利用できることが分かる。ま
た、従来の脱硫剤として単に塊状のものを投入したが、
その場合と比較した脱硫率は、図３でみると２倍程度向
上していた。 実施例２ 実施例１は、本発明に係る脱硫剤を鋼浴面に単なる投入
で行った例であるが、本発明はそれに限らず、ランスを
介して不活性ガスを用いて鋼浴に吹きつけても良い。図
１に示すＲＨ真空脱ガス装置を用い、上吹きした例を以
下に示す。A typical desulfurization behavior in this treatment is shown in FIG.
Further, FIG. 3 shows the relationship between the basic unit of desulfurizing agent and the desulfurization rate. Here, desulfurizing agent (%) = (before treatment [% S] -after treatment [% S]) /
Before treatment [% S] × 100 From FIG. 2, the desulfurizing agent of the present invention is [% S] in molten steel at the start of treatment.
If S] is 30 ppm, it can be desulfurized up to 15 ppm, and it can be seen that it can be sufficiently used as a desulfurizing agent. In addition, as a conventional desulfurizing agent, only a lumpy one was added,
The desulfurization rate compared with that case was improved by about two times as seen in FIG. Example 2 Example 1 is an example in which the desulfurizing agent according to the present invention was simply put on the steel bath surface, but the present invention is not limited thereto, and the steel bath is blown with an inert gas through a lance. You can put it on. An example of top blowing using the RH vacuum degassing apparatus shown in FIG. 1 is shown below.
【００１６】ＲＨ真空脱ガス処理前の溶鋼組成及びスラ
グ性状は実施例−１と同様である。上記ＲＨ処理開始か
ら３分経過後、図１に示すＢで上吹きランスから、表１
の（２）に示す脱硫剤を、０．３〜０．７ｋｇ／ｔ・ｍ
ｉｎの流量で１０〜１５分間真空層内溶鋼に吹き付け
た。なお、この際、キャリア・ガスはアルゴン・ガスを
使用した。The molten steel composition and slag properties before the RH vacuum degassing treatment are the same as in Example-1. After 3 minutes have passed from the start of the RH treatment, the upper blow lance indicated by B in FIG.
The desulfurizing agent shown in (2) of 0.3 to 0.7 kg / t · m
The molten steel in the vacuum layer was sprayed at a flow rate of in for 10 to 15 minutes. At this time, argon gas was used as the carrier gas.
【００１７】このときの代表的な脱硫挙動を図４に示
す。２０分間の脱ガス処理で、Ｓ＜１０ｐｐｍの低硫鋼
を得ることができた。なお、実施例では、２次精錬用装
置としてＲＨ真空脱ガス装置を用いたが、本発明はそれ
に限るものではなく、取鍋、ＶＯＤ真空脱ガス装置等に
も使用可能である。また、金属Ａｌを用いたが、Ａｌ灰
等、Ａｌ合金等でも構わない。A typical desulfurization behavior at this time is shown in FIG. After 20 minutes of degassing, low-sulfur steel with S <10 ppm could be obtained. Although the RH vacuum degassing device was used as the secondary refining device in the examples, the present invention is not limited to this, and can be used for a ladle, a VOD vacuum degassing device, and the like. Although metal Al is used, Al ash or the like, Al alloy or the like may be used.
【００１８】[0018]
【発明の効果】以上述べたように、本発明では、ＲＨ真
空脱ガス等の２次精錬で用いる脱硫剤を開発した。それ
は、ＣａＯ系脱硫剤中に粉状のガス発生物質と脱酸力の
ある金属を混合し、圧縮成形するようにしたので、鋼浴
へ添加する時の脱硫剤歩留りを向上させ、かつ反応性を
向上させることができた。また、ガス発生物質を用いる
ことにより溶鋼表面が撹拌されることから反応界面積を
増大させる効果や、ガス発生時の分解反応で反応界面の
温度が局所的に低下することから、鋼中の酸素活量が低
下し、さらに脱硫を促進するという効果も期待できる。As described above, the present invention has developed a desulfurizing agent used in secondary refining such as RH vacuum degassing. This is because the CaO-based desulfurizing agent is mixed with a powdery gas generating substance and a metal having a deoxidizing power and compression-molded. Therefore, the desulfurizing agent yield when added to a steel bath is improved, and the reactivity is improved. Was able to improve. In addition, since the molten steel surface is agitated by using the gas generating substance, the reaction interfacial area is increased, and the temperature of the reaction interface is locally reduced due to the decomposition reaction at the time of gas generation. It is expected that the activity will be reduced and that desulfurization will be promoted.
【図１】ＲＨ真空脱ガス装置を示す図である。FIG. 1 is a diagram showing an RH vacuum degassing apparatus.
【図２】本発明に係る脱硫剤の使用結果を示す図であ
る。FIG. 2 is a diagram showing a result of using the desulfurizing agent according to the present invention.
【図３】本発明に係る脱硫剤と従来のものとの脱硫率の
比較を示す図である。FIG. 3 is a diagram showing a comparison of desulfurization rates of a desulfurizing agent according to the present invention and a conventional one.
【図４】本発明に係る脱硫剤をガス吹きで使用した結果
を示す図である。FIG. 4 is a view showing a result of using the desulfurizing agent according to the present invention by gas blowing.
Ａ 合金鉄添加装置 Ｂ 上吹きランス １ 真空槽 ２ 粉体吹込装置 ３ 取鍋 ４ 溶鋼 ５ スラグ A Alloy iron adding device B Top blowing lance 1 Vacuum tank 2 Powder blowing device 3 Ladle 4 Molten steel 5 Slag
Claims (3)
酸化物からなる粉状ガス発生物質及び脱酸力を有する金
属粉末の一定割合の均一混合物からなり、粒度が１ｍｍ
以上のブリケットであることを特徴とする溶鋼の脱硫
剤。1. A powdery desulfurizing agent mainly composed of CaO, a powdery gas generating substance composed of a metal carbonate, and a metal powder having a deoxidizing power in a uniform mixture in a fixed ratio, and having a particle size of 1 mm.
A desulfurizing agent for molten steel, which is the above briquette.
状の金属炭酸化物からの発生酸素当量を酸化する量とし
たことを特徴とする請求項１記載の溶鋼の脱硫剤。2. The desulfurizing agent for molten steel according to claim 1, wherein the compounding amount of the metal powder having a deoxidizing power is an amount that oxidizes the oxygen equivalent generated from the powdery metal carbonate.
ｇＣＯ3 ，脱酸力を有する金属がＡｌであることを特徴
とする請求項２記載の溶鋼の脱硫剤。3. The metal carbonate is CaCO 3 or / and M
The desulfurizing agent for molten steel according to claim 2, wherein gCO 3 and the metal having a deoxidizing power are Al.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33591293A JPH07188728A (en) | 1993-12-28 | 1993-12-28 | Desulfurizing agent for molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33591293A JPH07188728A (en) | 1993-12-28 | 1993-12-28 | Desulfurizing agent for molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07188728A true JPH07188728A (en) | 1995-07-25 |
Family
ID=18293761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33591293A Withdrawn JPH07188728A (en) | 1993-12-28 | 1993-12-28 | Desulfurizing agent for molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07188728A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100491335B1 (en) * | 2003-03-03 | 2005-05-25 | (주)디엠 | Deoxidizer and desulfurizer for refining molten steel, with improved efficiency of deoxidation and desulfurization |
| JP2006052437A (en) * | 2004-08-11 | 2006-02-23 | Technic Sangyo Kk | Slag-making material for molten iron, and method for using the same |
| WO2013057262A3 (en) * | 2011-10-20 | 2013-08-15 | Almamet Gmbh | Desulfurization agent containing bitumen, method for the production thereof, and use thereof |
| RU2732027C1 (en) * | 2019-07-31 | 2020-09-10 | Общество с ограниченной ответственностью "ИЗОМЕТИКА" (ООО "ИЗОМЕТИКА") | Refining flux for out of furnace finishing of steel |
-
1993
- 1993-12-28 JP JP33591293A patent/JPH07188728A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100491335B1 (en) * | 2003-03-03 | 2005-05-25 | (주)디엠 | Deoxidizer and desulfurizer for refining molten steel, with improved efficiency of deoxidation and desulfurization |
| JP2006052437A (en) * | 2004-08-11 | 2006-02-23 | Technic Sangyo Kk | Slag-making material for molten iron, and method for using the same |
| JP4637528B2 (en) * | 2004-08-11 | 2011-02-23 | テクニクス産業株式会社 | Molten iron making material and method of using the same |
| WO2013057262A3 (en) * | 2011-10-20 | 2013-08-15 | Almamet Gmbh | Desulfurization agent containing bitumen, method for the production thereof, and use thereof |
| RU2610987C2 (en) * | 2011-10-20 | 2017-02-17 | Альмамет Гмбх | Bituminous desulfurizing agent |
| DE102011116501C5 (en) * | 2011-10-20 | 2018-05-24 | Almamet Gmbh | Bitumen-containing desulphurising agent |
| US10190183B2 (en) | 2011-10-20 | 2019-01-29 | Almamet Gmbh | Method for desulfurizing |
| RU2732027C1 (en) * | 2019-07-31 | 2020-09-10 | Общество с ограниченной ответственностью "ИЗОМЕТИКА" (ООО "ИЗОМЕТИКА") | Refining flux for out of furnace finishing of steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4139369A (en) | Desulphurization of an iron melt | |
| JP3687433B2 (en) | How to remove hot metal | |
| JP2010095786A (en) | Method for dephosphorizing molten iron | |
| JP2008266666A (en) | Method for dephosphorizing molten pig iron | |
| JPH07188728A (en) | Desulfurizing agent for molten steel | |
| JPH09157732A (en) | Method for desulfurizing and dehydrogenating molten steel with little erosion of refractory | |
| JP3525766B2 (en) | Hot metal dephosphorization method | |
| JP3978355B2 (en) | Hot metal desulfurization agent and desulfurization method | |
| JP2006283164A (en) | Method for desulfurize-treating chromium-contained molten iron | |
| JP3365129B2 (en) | Manufacturing method of low sulfur steel | |
| JP3297801B2 (en) | Hot metal removal method | |
| CA2136083A1 (en) | Improved method of desulfurization in vacuum processing of steel | |
| JP3769875B2 (en) | Desulfurization method and desulfurization agent for iron-based molten alloy | |
| CN1206373C (en) | Method and use of calcium nitrate for foaming of steel-making slags | |
| JP2000345224A (en) | Method for desulfurizing molten iron | |
| US3666445A (en) | Auxiliary composition for steel-making furnaces | |
| JP3728870B2 (en) | Desulfurization method and desulfurization agent for iron-based molten alloy | |
| JP4637528B2 (en) | Molten iron making material and method of using the same | |
| JP2000345226A (en) | Method for dephosphorizing molten iron | |
| JPH05140626A (en) | Method for pretreating molten iron | |
| JP3736229B2 (en) | Hot metal processing method | |
| JPH1036148A (en) | Treatment of molten iron dephosphorized slag and slag | |
| JP2757707B2 (en) | Hot metal dephosphorization slag treatment method | |
| JP2003328021A (en) | Method for manufacturing low-phosphorus molten pig iron | |
| KR101863916B1 (en) | Composition of Steelmaking Flux for Desulfurization and Deoxidation Using By-proudut of Magnesium Smelting Process and Waste By-product of Aluminum Smelting Process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010306 |