JP2001303116A - Desulfurizing agent for molten iron and its using method - Google Patents
Desulfurizing agent for molten iron and its using methodInfo
- Publication number
- JP2001303116A JP2001303116A JP2000126799A JP2000126799A JP2001303116A JP 2001303116 A JP2001303116 A JP 2001303116A JP 2000126799 A JP2000126799 A JP 2000126799A JP 2000126799 A JP2000126799 A JP 2000126799A JP 2001303116 A JP2001303116 A JP 2001303116A
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- desulfurizing agent
- iron
- desulfurizing
- 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.)
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、溶銑脱硫剤とその
使用方法に係わり、詳しくは、高炉等で溶製された溶銑
を転炉等で製鋼する前に行なう溶銑からの脱硫技術に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot metal desulfurizing agent and a method of using the same, and more particularly, to a desulfurization technique for hot metal produced in a blast furnace or the like before steelmaking in a converter or the like.
【０００２】[0002]
【従来の技術】一般に、高炉等の溶銑製造炉で製錬され
た溶銑は、まだ原料の鉱石類やコークスを起源とした硫
黄分を含んでいる。その濃度は、使用原料の種類や操業
方法によっても異なるが、通常０．０２０〜０．１００
質量％程度である。一方、鉄鋼材料としては、硫黄快削
鋼等の特別な鋼材を除き、硫黄の含有量は少ないほど良
いとされる。そのため、通常は、溶銑段階で脱硫処理が
行われ、さらに必要に応じて溶鋼段階でも脱硫処理が施
される。2. Description of the Related Art In general, hot metal smelted in a hot metal manufacturing furnace such as a blast furnace still contains a sulfur content originating from ores and coke as raw materials. The concentration varies depending on the type of raw material used and the operation method, but is usually 0.020 to 0.100.
% By mass. On the other hand, as a steel material, except for a special steel material such as sulfur free-cutting steel, the smaller the sulfur content, the better. Therefore, usually, desulfurization treatment is performed at the molten iron stage, and further desulfurization treatment is performed at the molten steel stage as needed.
【０００３】この溶銑の脱硫剤としては、現在のところ
以下に示すものが一般的である。すなわち、溶銑中硫黄
との親和性が強いＣａ、Ｍｇ、Ｎａ、Ｂａ等のアルカリ
金属、アルカリ土類金属やそれらの酸化物、炭酸化物、
炭化物であり、工業的には、生石灰、石灰石、ソーダ
灰、カルシウムカーバイド等の利用が多い。また、これ
らの脱硫剤は、単味で使用されるのではなく、蛍石（Ｃ
ａＦ2を主成分とする）、アルミナ（Ａｌ2Ｏ3）等の媒
溶剤や、酸素分圧を低下させる炭素含有物質や金属アル
ミニウム等と混合、使用されることも多い。At present, the following ones are generally used as desulfurizing agents for hot metal. That is, alkali metals such as Ca, Mg, Na, and Ba, which have a strong affinity for sulfur in hot metal, alkaline earth metals and oxides and carbonates thereof,
It is a carbide, and industrially, quick lime, limestone, soda ash, calcium carbide, and the like are often used. In addition, these desulfurizing agents are not used simply, but are used as fluorite (C
aF 2 as a main component), a solvent such as alumina (Al 2 O 3 ), a carbon-containing substance that lowers the oxygen partial pressure, metal aluminum, or the like, and is often used.
【０００４】ところで、このような脱硫剤を使用しての
溶銑の脱硫方法には、従来より多種の手法がとられてき
た。代表的な例をいくつか挙げると、まず、高炉から製
鋼工場へ溶銑を搬送するトピードカーや溶銑搬送鍋に保
持した溶銑に対し、耐火物で保護した鉄パイプを介し
て、粉粒状の上記脱硫剤や媒溶剤をキャリアガスを用い
て吹き込む方法がある。なお、この方法は、一般に「イ
ンジェクション法」と称されているが、脱硫剤と媒溶剤
とを予め混合し、同時に吹込んでも良い。また、他の手
法としては、上記した脱硫剤や媒溶剤等を反応容器内に
予め装入しておき、その上から溶銑を注入して脱硫剤と
溶銑との接触、混合を促進して脱硫反応を起こさせるも
のもある。この方法は、「置き注ぎ法」と呼ばれる。さ
らに、取鍋に保持した溶銑に耐火物製の撹拌子を浸漬
し、それを回転させて溶銑を撹拌し、その溶銑表面上に
上記脱硫剤や媒溶剤を添加して溶銑中に巻き込ませ、脱
硫反応を促進させる方法もある。この方法は、「インペ
ラー撹拌法」あるいは「ＫＲ法」と呼ばれている。以上
に述べた溶銑の脱硫剤と脱硫方法を採用すれば、溶銑中
の硫黄濃度を、０．００１〜０．０１５質量％程度まで
低下させることができると言われている。[0004] By the way, various methods have been conventionally used for desulfurizing hot metal using such a desulfurizing agent. Some typical examples are as follows: First, the powdered desulfurizing agent is passed through a topped car that transports hot metal from a blast furnace to a steelmaking plant or hot metal held in a hot metal transfer pan through an iron pipe protected by a refractory. Or a method of blowing a solvent medium using a carrier gas. This method is generally called an "injection method". However, a desulfurizing agent and a solvent may be mixed in advance and simultaneously blown. As another method, the above desulfurizing agent, medium solvent, etc. are charged in a reaction vessel in advance, and hot metal is poured from above to promote contact and mixing between the desulfurizing agent and the hot metal, thereby achieving desulfurization. Some will cause a reaction. This method is called a "place-and-pour method." Furthermore, a stirrer made of refractory is immersed in the hot metal held in the ladle, and the hot metal is stirred by rotating it, and the desulfurizing agent and the medium solvent are added to the hot metal surface and rolled into the hot metal, There is also a method of accelerating the desulfurization reaction. This method is called "impeller stirring method" or "KR method". It is said that if the desulfurizing agent and desulfurization method for hot metal described above are employed, the sulfur concentration in the hot metal can be reduced to about 0.001 to 0.015% by mass.
【０００５】加えて、ＣａＯ粉とＭｇ粉とを予め混合
し、前記「インジェクション法」により溶銑中に吹き込
んで脱硫を行う方法も、世界中で実用化されている。さ
らに加えて、特公昭５９−４２０４７号公報は、Ｍｇ酸
化物を含む金属Ｍｇに有機高分子物質を粘結剤として添
加してから球状あるいはブリケット状に加圧成形する製
錬用添加剤の製造方法を開示している。また、特公昭５
９−４２０６１号公報は、Ｍｇ酸化物を含む金属Ｍｇを
ブリケットに加圧成形してから、不活性雰囲気中で加熱
する製錬用添加剤の製造方法を、特公昭６０−９０８４
号公報は、超微粉金属Ｍｇと酸化Ｍｇを混合して球状の
成形体としてから溶銑に投入する溶銑脱硫方法を開示し
ている。さらに、特公昭６０−１００８４号公報は、個
々の長さが０．３２〜２２．９ｍｍ、幅が０．０４〜
２．４ｍｍ、厚さが０．００２５〜０．２５４ｍｍの鉄
スクラップ片を圧縮し、４．０〜６．３ｇ／ｃｃの嵩密
度、ほぼ２０〜５０％の気孔率を有する鉄系金属スクラ
ップの集合体を溶融金属Ｍｇに浸漬し、該集合体の網目
状の隙間に所定量の金属Ｍｇを含浸させた脱硫剤と、そ
れを用いた溶銑の脱硫方法を提案している。In addition, a method in which CaO powder and Mg powder are preliminarily mixed and then blown into hot metal by the above-mentioned "injection method" to perform desulfurization has been put to practical use all over the world. In addition, Japanese Patent Publication No. 59-42047 discloses a method for producing a smelting additive in which an organic polymer substance is added as a binder to metallic Mg containing Mg oxide and then pressed into spherical or briquette shapes. A method is disclosed. In addition, Tokubo Sho 5
Japanese Patent Publication No. 9-42061 discloses a method for producing a smelting additive in which metallic Mg containing Mg oxide is molded into briquettes under pressure and then heated in an inert atmosphere.
Japanese Patent Application Publication No. JP-A-2005-115122 discloses a hot metal desulfurization method in which ultrafine powdered metal Mg and Mg oxide are mixed to form a spherical compact and then charged into hot metal. Further, Japanese Patent Publication No. 60-10084 discloses that each length is 0.32 to 22.9 mm and the width is 0.04 to
2.4 mm, a thickness of 0.0025 to 0.254 mm of an iron scrap piece is compressed, and a ferrous metal scrap having a bulk density of 4.0 to 6.3 g / cc and a porosity of approximately 20 to 50%. A desulfurizing agent in which an aggregate is immersed in molten metal Mg and a predetermined amount of metal Mg is impregnated in a mesh-like gap of the aggregate, and a method for desulfurizing molten iron using the same are proposed.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記し
た多くの脱硫剤及び脱硫方法には、以下に述べるような
欠点があった。However, many of the above desulfurizing agents and desulfurizing methods have the following disadvantages.
【０００７】まず、ＣａＯをベースとする脱硫剤は、安
価であるため広く使用されるが、添加したＣａＯの内、
脱硫反応に使用される割合（脱硫効率）が数％程度しか
なく、多くのＣａＯは未反応のままである。したがっ
て、所望の溶銑中硫黄濃度まで脱硫するには、大量のＣ
ａＯを使用せざるを得ず、使用に際しては、溶銑の温度
降下が大きくなったり、発生する脱硫スラグ量も大量と
なる等の不利益がある。また、ソーダ灰は、強力な脱硫
剤であるので、特に低濃度までの脱硫を要求される場合
に使用されることが多いが、ＣａＯと比較して高価であ
り、発生するＮａ蒸気に起因した発煙、発塵が激しく、
耐火物の溶損が大きい等の問題がある。さらに、Ｍｇ粉
は、高価であるものの脱硫反応効率が高く、低い硫黄濃
度まで脱硫が可能である反面、酸素との反応性が高くて
爆発的な反応を引き起こすため、大気中での取り扱いに
制約がある。そのため、通常、多量のＣａＯ粉と混合し
て大気との接触を抑制する手段がとられ、反応性の低い
ＣａＯを必要以上に多量使用しているのが実情である。First, CaO-based desulfurizing agents are widely used because they are inexpensive.
The ratio (desulfurization efficiency) used in the desulfurization reaction is only about several percent, and most CaO remains unreacted. Therefore, in order to desulfurize to the desired sulfur concentration in the hot metal, a large amount of C
AO must be used, and when used, there are disadvantages such as a large drop in temperature of the hot metal and a large amount of generated desulfurization slag. Also, since soda ash is a powerful desulfurizing agent, it is often used especially when desulfurization to a low concentration is required, but it is more expensive than CaO and caused by the generated Na vapor. Smoke and dust are intense,
There are problems such as large melting loss of refractories. Furthermore, although Mg powder is expensive, it has a high desulfurization reaction efficiency and can desulfurize to a low sulfur concentration, but has a high reactivity with oxygen and causes an explosive reaction, which restricts handling in the atmosphere. There is. For this reason, measures are usually taken to suppress contact with the atmosphere by mixing with a large amount of CaO powder, and the fact is that CaO with low reactivity is used in an unnecessarily large amount.
【０００８】脱硫方法について述べれば、インジェクシ
ョン法は、粉状脱硫剤と溶銑との反応界面積を非常に大
きくとれるので、脱硫反応速度が大きくなり、有効な手
法である。しかし、一方では、耐火物で保護された吹き
込み用鉄パイプや吹き込み用ガスが多量に必要で経済性
に問題があるばかりでなく、激しいガス撹拌により溶銑
やスラグの飛散が大きくなり、操業が行ない難い等の欠
点もある。また、「置き注ぎ法」は、設備がほとんど不
要で簡便な方法であるが、従来より使用している脱硫剤
の見かけ比重が溶銑に比べて非常に小さいため、瞬時に
溶銑表面に浮き上がってしまい、溶銑との接触を保てな
いため反応効率が非常に低いという問題があった。この
点で、前記「インペラー撹拌法」あるいは「ＫＲ法」
は、溶銑表面上の脱硫剤を溶銑中に巻き込ませることが
できるので、上記「置き注ぎ法」と比べると反応効率は
大きい。しかしながら、やはり従来の脱硫剤を使用した
のでは、見かけ比重が小さいので、溶銑中への巻き込み
深さが浅く、未反応の脱硫剤が多いのが現状である。加
えて、溶銑中の硫黄との反応性が高い金属Ｍｇを添加し
て脱硫する方法は、前述のように、ＣａＯ粉との混合物
を吹込むようにしていたが、金属Ｍｇは、溶銑よりも沸
点が低くて溶銑と接触すると瞬時に沸騰して気体となる
ため、添如した金属Ｍｇの一部しか反応に寄与せず、Ｍ
ｇ自体が高価なこともあり、適用範囲が限られていた。
そのため、上記したように、金属Ｍｇと溶銑との接触を
向上させるため、酸化Ｍｇと混合してから成形体として
溶銑中に添加する試みが提案されたが、この成形体は、
嵩密度が非常に小さく、溶銑に添加しても表面上に浮い
てしまい溶銑との反応がほとんど期待できなかった。ま
た、鉄系スクラップを原料として嵩密度の比較的大きな
圧縮成形体を製造し、この圧縮成形体の網目状の隙間に
Ｍｇを含潰させたものを溶銑に添加して脱硫する方法
は、高価な金属Ｍｇを、それも溶融状態で準備する必要
があり、経済的でなかった。さらに、該圧縮成形体の網
目状隙間に金属Ｍｇを含浸させるには、成形時のバラツ
キで隙間の形態が不安定であるため、その含浸量を必要
範囲に調整するのが難しく、所定のＭｇ含有量を安定し
て得ることが困難であった。その上、金属Ｍｇを成形体
の表面側から含浸させるため、Ｍｇがこの成形体の表面
に近い部分に多く存在し、高温の溶銑中では、表面近く
の金属Ｍｇが瞬時に気体となって逸散するため、反応に
寄与するＭｇの割合が低いという問題があった。Describing the desulfurization method, the injection method is an effective method because the reaction interface area between the powdery desulfurizing agent and the hot metal can be made very large, and the desulfurization reaction rate increases. However, on the other hand, a large amount of blowing iron pipes and blowing gas protected by refractories are required, which is not only economically problematic, but also violent gas agitation causes large amounts of hot metal and slag to be scattered. There are also disadvantages such as difficulty. In addition, the `` pour-in method '' is a simple method that requires almost no equipment, but the apparent specific gravity of the desulfurizing agent that has been used in the past is very small compared to hot metal, so it instantly floats on the hot metal surface. However, there has been a problem that the reaction efficiency is extremely low because contact with hot metal cannot be maintained. In this regard, the "impeller stirring method" or "KR method"
Since the desulfurizing agent on the surface of the hot metal can be involved in the hot metal, the reaction efficiency is large as compared with the above “place-pour method”. However, if a conventional desulfurizing agent is used, the apparent specific gravity is small, so that the entrapment depth in the hot metal is shallow, and there are many unreacted desulfurizing agents at present. In addition, the method of desulfurizing by adding metal Mg having high reactivity with sulfur in hot metal, as described above, was to blow a mixture with CaO powder, but metal Mg has a lower boiling point than hot metal. When it comes into contact with hot metal, it instantaneously boils and becomes a gas, so that only a part of the added metallic Mg contributes to the reaction, and M
Since g itself was expensive, the applicable range was limited.
Therefore, as described above, in order to improve the contact between the metallic Mg and the hot metal, an attempt was made to mix it with Mg oxide and then add it as a compact into the hot metal, but this compact was
The bulk density was very small, and even when added to hot metal, it floated on the surface, and almost no reaction with hot metal could be expected. Further, a method of manufacturing a compression-molded body having a relatively large bulk density from iron-based scrap as a raw material and adding Mg-filled mesh-like gaps to the hot metal to desulfurize the compression-molded body is expensive. It was not economical to prepare a fresh metallic Mg, also in a molten state. Further, in order to impregnate the mesh-like gaps of the compression-molded body with metallic Mg, it is difficult to adjust the impregnation amount to a required range because the form of the gaps is unstable due to variations during molding. It was difficult to obtain a stable content. In addition, since the metallic Mg is impregnated from the surface side of the compact, a large amount of Mg is present in a portion near the surface of the compact, and in hot hot metal, the metallic Mg near the surface instantaneously becomes a gas and escapes. Therefore, there is a problem that the ratio of Mg contributing to the reaction is low.
【０００９】本発明は、かかる事情に鑑み、溶銑からの
脱硫が、従来より脱硫効率を高く、且つ安価に実施可能
な溶銑脱硫剤とその使用方法を提供することを目的とし
ている。[0009] In view of such circumstances, an object of the present invention is to provide a hot metal desulfurizing agent capable of performing desulfurization from hot metal with higher desulfurization efficiency and lower cost than before, and a method of using the same.
【００１０】[0010]
【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、従来の溶銑の脱硫剤及び脱硫方法を鋭意見
直した。そして、特に脱硫機能の高い金属Ｍｇの利用方
法に改良の余地があると結論し、その利用方法の改良に
鋭意努力を重ね、その成果を本発明に具現化した。Means for Solving the Problems In order to achieve the above object, the inventor has sharply reviewed the conventional hot metal desulfurizing agent and desulfurizing method. Then, they concluded that there is room for improvement in the use of metallic Mg, which has a particularly high desulfurization function, and worked diligently to improve the use of the metal, and realized the results in the present invention.
【００１１】すなわち、本発明は、粉粒状の金属Ｍｇも
しくはＭｇ合金と、粉粒状の金属鉄もしくは鉄合金とを
混合し、見かけ比重が３以上の塊状体に加圧成形したこ
とを特徴とする溶銑脱硫剤である。この場合、前記塊状
体は、ブリケット状、タブレット状、角状又はペレット
状であり、前記塊状体の空隙率は、１％〜３８％の範囲
にあることが好ましい。そして、前記金属鉄もしくは鉄
合金の一部又は全部を、製鉄ダストもしくは製鉄スラジ
としたり、あるいは、さらに、脱硫機能を有する物質及
び／又は脱硫時に形成するスラグの融点を低下させる物
質を混合させるのが良い。その脱硫機能を有する物質
は、ＣａＯ、Ｎａ2Ｏ、Ｎａ2ＣＯ3及びＣａＣ2から選ば
れた１種又は２種以上であったり、前記脱硫時に形成す
るスラグの融点を低下させる物質は、ＣａＦ2、Ｍｇ
Ｏ、Ａｌ2Ｏ3及びＳｉＯ2から選ばれた１種又は２種以
上であることが好ましい。That is, the present invention is characterized in that powdered metal Mg or Mg alloy and powdered metal iron or iron alloy are mixed and pressed into a bulk having an apparent specific gravity of 3 or more. It is a hot metal desulfurizing agent. In this case, the mass is preferably in the form of a briquette, tablet, square or pellet, and the porosity of the mass is preferably in the range of 1% to 38%. Then, a part or all of the metallic iron or iron alloy is made into iron-made dust or iron-made sludge, or further, a substance having a desulfurization function and / or a substance that lowers the melting point of slag formed at the time of desulfurization is mixed. Is good. The substance having the desulfurization function is one or more selected from CaO, Na 2 O, Na 2 CO 3 and CaC 2, and the substance which lowers the melting point of the slag formed at the time of desulfurization is CaF 2 , Mg
It is preferable to use one or more selected from O, Al 2 O 3 and SiO 2 .
【００１２】また、前記粉粒状には、片状、切り粉状も
含むことにしたり、前記金属ＭｇもしくはＭｇ合金を、
成形体の中心部分に多く、金属鉄もしくは鉄合金を、成
形体の表面部分に多く存在させるようにすると一層好ま
しい。さらに、金属Ｍｇとしての含有率が３〜７５質量
％の範囲にあると良い。Further, the powdery and granular forms include flakes and chips, and the metal Mg or Mg alloy is
It is more preferable that a large amount of metallic iron or iron alloy be present on the surface portion of the molded body, more in the central portion of the molded body. Further, the content as metal Mg is preferably in the range of 3 to 75% by mass.
【００１３】加えて、本発明は、容器内に保持した溶銑
の脱硫を行なうに際して、前記容器内に、上記した本発
明に係る脱硫剤を予め装入し、その上に溶銑を注入する
ことを特徴とする溶銑脱硫剤の使用方法である。さらに
加えて、本発明は、容器内に保持した溶銑の脱硫を行な
うに際して、前記容器に溶銑を注入すると同時に、上記
脱硫剤を添加したり、あるいは前記容器内の溶銑を機械
撹拌により回転させ、その溶銑表面上に上記の脱硫剤を
添加することを特徴とする溶銑脱硫剤の使用方法でもあ
る。その際、前記容器には、通常、取鍋又はトピードカ
ーが使用される。本発明によれば、Ｍｇを脱硫剤の主原
料に使用しても、大気との接触で直ちに燃焼してしまう
という問題点が解消され、溶銑の脱硫効率が従来より向
上する。また、何ら新しい装置を設けることなく、既存
の装置及び手法が利用できるので、安価な脱硫が実施で
きる。In addition, the present invention provides that when desulfurizing hot metal held in a container, the desulfurizing agent according to the present invention described above is previously charged into the container, and hot metal is injected onto the desulfurizing agent. This is a characteristic method of using a hot metal desulfurizing agent. In addition, the present invention, when performing desulfurization of the hot metal held in the container, simultaneously injecting the hot metal into the container, adding the desulfurizing agent, or rotating the hot metal in the container by mechanical stirring, A method of using a hot metal desulfurizing agent characterized by adding the above desulfurizing agent to the surface of the hot metal. At that time, a ladle or a topped car is usually used for the container. ADVANTAGE OF THE INVENTION According to this invention, even if it uses Mg as a main raw material of a desulfurizing agent, the problem that it burns immediately by contact with air | atmosphere is solved, and the desulfurization efficiency of hot metal improves conventionally. Further, since existing equipment and methods can be used without providing any new equipment, inexpensive desulfurization can be performed.
【００１４】[0014]
【発明の実施の形態】発明者は、従来技術を見直した際
に、溶銑中硫黄との反応性は非常に高いが、大気中での
取り扱いが危険であるＭｇに着眼した。その理由は、簡
便で、且つ特別な装置を必要としない適切な利用方法が
あれば、溶銑脱硫剤の主体として非常に有効なものにな
ると感じたからである。そこで、一番の問題点である大
気や溶銑とＭｇとの早期接触を遅らせる技術の開発に鋭
意努力し、Ｍｇの大部分を鉄や媒溶剤で囲むことに想到
した。つまり、塊状体に加圧成形して特公昭６０−１０
０８４号公報に記載された従来の脱硫剤より見掛け比重
を大きくすると共に、内部の空隙の減少を図ったのであ
る。これにより、溶銑中に確実に浸漬でき、簡便な「置
き注ぎ法」でも高い反応効率が得られ、また、「インペ
ラー撹拌法」、「ＫＲ法」では、従来のＣａＯベースの
脱硫剤より優れた脱硫特性が得られるようになる。以下
に、発明をなすに至った経緯も交え、本発明の実施の形
態を説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS When reviewing the prior art, the inventor focused on Mg, which has a very high reactivity with sulfur in hot metal, but is dangerous to handle in the atmosphere. The reason is that if there is a simple and appropriate utilization method that does not require a special device, it was felt that it would be very effective as a main component of the hot metal desulfurizing agent. Accordingly, the present inventors have made an intensive effort to develop a technology for delaying the early contact between the atmosphere and the hot metal and Mg, which is the most problematic problem, and came to the idea of enclosing most of Mg with iron or a solvent. In other words, press molding into a lump body
The apparent specific gravity was made larger than that of the conventional desulfurizing agent described in JP-A-0884, and the internal voids were reduced. Thereby, it can be reliably immersed in hot metal, and a high reaction efficiency can be obtained even by a simple “place-pour method”. In addition, “impeller stirring method” and “KR method” are superior to conventional CaO-based desulfurizing agents. Desulfurization characteristics can be obtained. Hereinafter, embodiments of the present invention will be described with reference to the circumstances that led to the invention.
【００１５】まず、本発明に係る溶銑脱硫剤に含ませる
金属Ｍｇは、純粋でなくても良く、多少の不純物や合金
成分を含んでいても実質的に金属Ｍｇが含有されていれ
ば良い。また、金属Ｍｇの一部が酸化してＭｇＯとなっ
ていても、その割合が低ければ特に問題はない。さら
に、従来のように、溶融状態のＭｇを準備して鉄系スク
ラップの圧縮成形体に含浸させるのではなく、常温の粉
粒状で単に金属鉄あるいは鉄合金を含む粉粒体と混合し
て成形するので、Ｍｇの含有量を必要な範囲に容易に調
整でき、かつ常温であるがため、安全に塊状体として加
圧成形することができる。加えて、成形時には、図３に
示すように、鉄に富む物質２を塊状体３の表面部分にな
るようにして、Ｍｇに富む物質１を中心部分に主として
存在させるようにすることもできる。このようにする
と、溶銑中において伝熱が該塊状体の表面から中心に向
かって起きるため、Ｍｇの昇温・沸騰が遅れ、Ｍｇと溶
銑との反応時間を長くすることができるからである。そ
の結果、高価なＭｇの気体としての逸散ロスを従来に比
べ格段と抑制することが可能となる。なお、高価なＭｇ
には、機械加工の工程で発生する切り屑やＭｇ合金製品
の成形時に発生する不要な端部等、一般に廃棄物として
取り扱われるものを有効に利用するのが好ましい。First, the metal Mg contained in the hot metal desulfurizing agent according to the present invention does not have to be pure, and it is sufficient that the metal Mg is substantially contained even if it contains some impurities or alloy components. Even if a part of the metallic Mg is oxidized to MgO, there is no particular problem as long as the ratio is low. Furthermore, instead of preparing Mg in a molten state and impregnating it into a compact of iron-based scrap as in the past, it is simply mixed with a powder containing iron or iron alloy in the form of powder at room temperature and formed. Therefore, the content of Mg can be easily adjusted to a required range, and since the temperature is room temperature, it is possible to safely perform pressure molding as a lump. In addition, at the time of molding, as shown in FIG. 3, the iron-rich substance 2 can be made to be on the surface of the lump 3 and the Mg-rich substance 1 can be mainly present in the central part. This is because heat transfer occurs from the surface of the massive body toward the center in the hot metal, so that the temperature rise and boiling of Mg are delayed, and the reaction time between Mg and the hot metal can be prolonged. As a result, the dissipation loss of expensive Mg as a gas can be significantly reduced as compared with the conventional case. In addition, expensive Mg
It is preferable to effectively use what is generally handled as waste, such as chips generated in a machining process and unnecessary edges generated during molding of a Mg alloy product.
【００１６】また、本発明に係る脱硫剤に含まれる金属
鉄には、安価なスクラップである銑鉄のダライ粉、鋼の
ダライ粉、切削屑、高炉スラグの粉砕・整粒工程で発生
する磁選粒鉄、製鉄所で発生、回収した金属鉄を含むダ
ストあるいはスラジ等が利用できる。The metallic iron contained in the desulfurizing agent according to the present invention includes magnetic iron granules generated in the pulverizing and sizing process of inexpensive scrap iron pig iron powder, steel iron powder, cutting chips and blast furnace slag. Dust or sludge containing metallic iron generated and collected at iron and steel works can be used.
【００１７】これらの金属Ｍｇ及び金属鉄の形状は、加
圧成形により塊状体とする都合上、粉粒状であることが
必要である。この場合、粉粒状には、片状、切り粉状も
含むものとする。金属ＭｇもしくはＭｇ合金と、金属鉄
もしくは合金鉄とを同時に混合した状態で加圧成形して
塊状体に出来る形状であれば良いからである。なお、塊
状体３としては、加圧成形の都合上、図２に示すような
ブリケット状、角状あるいはタブレット状である。しか
し、加圧力は小さくなるが、場合によっては、ペレット
状であっても良い。The shape of the metal Mg and the metal iron needs to be in the form of powder and granules, because they are formed into a lump by pressure molding. In this case, the powdery and granular forms include flakes and chips. This is because any shape may be used as long as the metal Mg or Mg alloy and the metal iron or the alloy iron are simultaneously mixed and pressure-formed to form a block. The mass 3 is in a briquette shape, a square shape or a tablet shape as shown in FIG. 2 for convenience of pressure molding. However, although the pressure is small, it may be in the form of pellets in some cases.
【００１８】次に、本発明に係る脱硫剤として特に重要
なことは、その見掛け比重が３以上に加圧成形されてい
ることである。これによって、塊状体の内部の空隙が従
来より減少し、Ｍｇと大気や溶銑との直接的に接触する
機会が減少し、早期燃焼による損失が抑制できるからで
ある。この場合、塊状体の空隙率としては、体積率で１
％〜３８％の範囲にあることが好ましい。３８％超えだ
と、大気や溶銑との直接接触するものが多くなり過ぎ、
１％未満のものは、加圧成形でも製作が困難だからであ
る。また、見掛け比重を上記範囲に限定したのは、３未
満では、溶銑の比重に比べて大幅に低いことから溶銑表
面上に浮かんでしまい、脱硫反応に寄与する機会が減少
するからである。Next, what is particularly important as the desulfurizing agent according to the present invention is that it is press-molded to have an apparent specific gravity of 3 or more. This is because the voids inside the mass are reduced as compared with the related art, the chance of direct contact between Mg and the atmosphere or hot metal is reduced, and the loss due to early combustion can be suppressed. In this case, the porosity of the lump is 1% by volume.
% Is preferably in the range of 38% to 38%. If it exceeds 38%, there is too much direct contact with the atmosphere and hot metal,
If the content is less than 1%, it is difficult to produce even by pressure molding. The reason why the apparent specific gravity is limited to the above range is that when the apparent specific gravity is less than 3, it floats on the surface of the hot metal because it is much lower than the specific gravity of the hot metal, and the opportunity to contribute to the desulfurization reaction decreases.
【００１９】また、本発明に係る脱硫剤には、金属Ｍｇ
及び金属鉄の他に、ＣａＯ、Ｎａ2Ｏ、Ｎａ2ＣＯ3、Ｃ
ａＣ2等の脱硫機能を有する物質やＣａＦ2、ＭｇＯ、Ａ
ｌ2Ｏ3、ＳｉＯ2等のスラグ融点を低下させる媒溶物質
を、以下に説明する理由で含ませることが推奨される。The desulfurizing agent according to the present invention includes a metal Mg.
And in addition to metallic iron, CaO, Na 2 O, Na 2 CO 3, C
substances having a desulfurization function such as aC 2 , CaF 2 , MgO, A
It is recommended that a solvent substance such as l 2 O 3 or SiO 2 that lowers the melting point of the slag be included for the following reasons.
【００２０】Ｍｇによる脱硫反応は、以下の化学式で表
せる。The desulfurization reaction by Mg can be represented by the following chemical formula.
【００２１】 Ｍｇ（ｇ）＋Ｓ＝ＭｇＳ（ｓ） …（１） 脱硫時の溶銑温度では、Ｍｇは気体であるのが安定であ
り、溶銑との接触後、瞬時に気体となり、溶銑中のＳと
反応してＭｇＳを生成する。この反応で生成したＭｇＳ
は、微細であり、溶銑中に懸濁して溶銑と分離し難いの
で、見掛け上溶銑脱硫が顕著でない場合がある。これを
回避するため、生成したＭｇＳを吸着し浮上分離させ易
くするために、ＣａＯ等の粉粒体をＭｇと同時に加圧成
形し、脱硫反応サイトに共存させるのが有効である。こ
のＭｇＳの吸着作用を有する物質としては、ＣａＯの
他、それ自身が脱硫機能を持つＮａ2ＣＯ3、ＣａＣ2等
が良い。さらに、脱硫後の溶銑上スラグの分離性を高め
るために、ＣａＦ2、ＭｇＯ、Ａｌ2Ｏ3、ＳｉＯ2等のス
ラグ融点を低下させる媒溶物質を含ませても良い。ただ
し、これらの物質が多過ぎると、スラグの脱硫能がかえ
って低下し、スラグから溶銑への復硫現象が現れるので
注意が必要である。なお、上記物質は、１種のみでも効
果があるが、適切なものを選んで２種以上使用しても良
い。Mg (g) + S = MgS (s) (1) At the hot metal temperature at the time of desulfurization, Mg is stable in the form of a gas. To produce MgS. MgS generated by this reaction
Is so fine that it is difficult to separate from the hot metal by suspending in the hot metal, so that apparent hot metal desulfurization may not be remarkable. In order to avoid this, it is effective to press-mold a powder such as CaO at the same time as Mg and coexist at the desulfurization reaction site in order to adsorb the generated MgS and facilitate the floating separation. As the substance having the action of adsorbing MgS, in addition to CaO, Na 2 CO 3 , CaC 2 or the like, which itself has a desulfurizing function, is preferable. Further, in order to enhance the separability of the slag on the hot metal after desulfurization, a medium-soluble substance such as CaF 2 , MgO, Al 2 O 3 or SiO 2 which lowers the melting point of the slag may be included. However, it should be noted that if the amount of these substances is too large, the desulfurization ability of the slag is rather reduced and a resulfurization phenomenon from the slag to the hot metal appears. In addition, although only one kind of the above substances is effective, two or more kinds of substances may be selected and used.
【００２２】さらに、本発明に係る脱硫剤においては、
金属Ｍｇの含有率は３〜７５質量％の範囲、より好まし
くは５〜５０質量％の範囲にあることが望ましい。３質
量％未満であると、Ｍｇによる脱硫効果が顕著ではない
のに加え、共存する金属鉄もしくは合金鉄が多量とな
り、溶銑の温度低下が無視できなくなる。この溶銑温度
の低下は、その後の精錬に支障を及ぼすので、出来るだ
け少ない方が望ましい。また、７５質量％を超えるＭｇ
の配合は、脱硫剤を溶銑中に添加した際に、気体Ｍｇの
発生が非常に激しくなって飛び去り、Ｍｇと溶銑中硫黄
との接触がかえって低下するので、総合的な脱硫効率を
低下させる。また、塊状体への成形時に、金属Ｍｇを多
量に配合することは、空気中の酸素と反応する確率が高
くなり、危険性が増すので、７５質量％以下に抑えるべ
きである。なお、図１に、脱硫剤を金属Ｍｇ原単位とし
て０．４〜０．６ｋｇ／ｔを使用した際の塊状体に含ま
れるＭｇの含有率と溶銑中硫黄の除去率を示すが、Ｍｇ
含有率が３〜７５質量％の範囲において溶銑の脱硫効率
が高いことが明らかである。Ｍｇ含有量が５〜５０質量
％とすれば８０％を超える脱硫効率が得られ、一層好ま
しい。Further, in the desulfurizing agent according to the present invention,
The content of metallic Mg is desirably in the range of 3 to 75% by mass, more preferably in the range of 5 to 50% by mass. If the amount is less than 3% by mass, the desulfurization effect of Mg is not remarkable, and the coexisting metal iron or alloy iron becomes large, and the temperature drop of the hot metal cannot be ignored. This lowering of the hot metal temperature hinders the subsequent refining, so it is desirable that the temperature is as small as possible. In addition, Mg exceeding 75% by mass
When the desulfurizing agent is added to the hot metal, the generation of gaseous Mg becomes so intense that it flies away, and the contact between Mg and sulfur in the hot metal decreases rather, thus lowering the overall desulfurization efficiency. . In addition, when a large amount of metallic Mg is added at the time of molding into a lump, the probability of reacting with oxygen in the air increases and the danger increases, so that it should be suppressed to 75% by mass or less. FIG. 1 shows the content of Mg contained in the lump and the removal rate of sulfur in the hot metal when 0.4 to 0.6 kg / t was used as a metallic Mg unit as a desulfurizing agent.
It is clear that the desulfurization efficiency of hot metal is high when the content is in the range of 3 to 75% by mass. If the Mg content is 5 to 50% by mass, desulfurization efficiency exceeding 80% can be obtained, which is more preferable.
【００２３】説明の最後になるが、本発明に係る脱硫剤
を溶銑と接触させて脱硫反応を起こさせるには、発明者
の試行によれば、公知の方法で十分である。例えば、脱
硫剤を取鍋もしくはトピードカー等の容器に予め装入し
ておき、この脱硫剤の上から溶銑を注入する方法で良
い。また、上記容器に溶銑を注入するのと同時に、本発
明に係る脱硫剤を添加する方法が簡便であり、特別な装
置を必要としないので、特に推奨できる。さらに、取鍋
のような容器内に溶銑を機械的に回転撹拌させる装置が
存在する場合には、その回転させた溶銑の表面上にこの
脱硫剤を添加すると良い。この脱硫剤の見掛け比重は３
〜７．５程度とあまり大きくはないが、溶銑に生じた渦
による下降流で脱硫剤が溶銑中に引き込まれ、Ｍｇと溶
銑との接触が長く保たれて反応効率が高まるからであ
る。At the end of the description, according to the inventor's trial, a known method is sufficient for bringing the desulfurizing agent according to the present invention into contact with hot metal to cause a desulfurization reaction. For example, a method in which a desulfurizing agent is previously charged in a container such as a ladle or a topped car and hot metal is poured over the desulfurizing agent may be used. In addition, the method of adding the desulfurizing agent according to the present invention at the same time as injecting the hot metal into the container is simple and does not require a special device, and thus can be particularly recommended. Further, when there is a device for mechanically rotating and stirring hot metal in a container such as a ladle, it is preferable to add the desulfurizing agent to the surface of the hot metal that has been rotated. The apparent specific gravity of this desulfurizing agent is 3
The desulfurization agent is drawn into the hot metal by the downward flow due to the vortex generated in the hot metal, which is not so large as about 7.5, but the reaction between Mg and the hot metal is maintained for a long time, thereby increasing the reaction efficiency.
【００２４】[0024]
【実施例】表１に、本発明に係る脱硫剤の配合例を示
す。それらは、あくまでも例であり、使用する物質の種
々の組合せで、非常に多くの配合を形成することが可能
である。要するに、金属Ｍｇを含む物質と金属鉄を含む
物質とを、一定の条件で配合し、塊状体に加圧成形すれ
ば良い。EXAMPLES Table 1 shows examples of the composition of the desulfurizing agent according to the present invention. They are merely examples, and it is possible to form numerous formulations with various combinations of the substances used. In short, a substance containing metallic Mg and a substance containing metallic iron may be blended under certain conditions, and then formed into a lump.
【００２５】[0025]
【表１】 [Table 1]
【００２６】ここでは、塊状体の形状に図２（ａ）のブ
リケット状に統一したが、その塊状体は、予め成形型を
製作し、表１に示した配合の粉粒体を充填してから呼称
１００〜２００トン（０．９８〜１．９６×１０6Ｎ）
の圧力を加えて製造した。その一個は、直径が８０ｍ
ｍ、高さが５０ｍｍである。勿論、一部に、図３に示し
た中心部分にＭｇに富む物質１を、表面に近い部分に鉄
に富む物質を配合して成形した塊状体も製造した。な
お、本発明に係る脱硫剤の効果を確認するため、比較例
として従来から存在する脱硫剤も準備した。Here, the shape of the lump was unified into a briquette shape as shown in FIG. 2 (a), but the lump was prepared by preparing a molding die in advance and filling the powder with the composition shown in Table 1. From 100 to 200 tons (0.98 to 1.96 × 10 6 N)
The pressure was applied. One of them is 80m in diameter
m, height is 50 mm. Of course, a lump formed by partially mixing the Mg-rich substance 1 in the center portion shown in FIG. 3 and the iron-rich substance in the portion near the surface was also manufactured. In order to confirm the effect of the desulfurizing agent according to the present invention, a conventionally existing desulfurizing agent was also prepared as a comparative example.
【００２７】次に、これらの脱硫剤を、取鍋に保持した
４トンの溶銑に、前記「置注法」、「インジェクション
法」あるいは「ＫＲ法」を採用して添加し、該溶銑の脱
硫処理が行なわれた。その際、溶銑は、同様な成分のも
のを、温度１３２０℃にほぼ揃えている。実施結果の一
例を、脱硫剤の嵩比重及び空隙率、処理前及び処理後の
硫黄濃度（単位：質量％、［％Ｓ］と記す）、処理前後
での［％Ｓ］＝０．００１当たりの処理コスト指数及び
脱硫率等で整理し、表２に示す。表２より、本発明に係
る脱硫剤は、従来のものに比べて脱硫率が高く、すべて
の場合で最終硫黄濃度が０．００３質量％以下となって
いた。なお、図１及び表２の脱硫率は、（処理後［％
Ｓ］−処理前［％Ｓ］）／処理前［％Ｓ］×１００とし
て計算したものである。Next, these desulfurizing agents are added to 4 tons of hot metal held in a ladle using the above-mentioned “place-injection method”, “injection method” or “KR method”, and the hot metal is desulfurized. Processing was performed. At that time, the hot metal has a similar composition, and the temperature is almost equal to 1320 ° C. Examples of the execution results are as follows: the bulk density and the porosity of the desulfurizing agent, the sulfur concentration before and after the treatment (unit: mass%, described as [% S]), and [% S] before and after the treatment per 0.001. Table 2 summarizes the treatment cost index and desulfurization rate. From Table 2, the desulfurizing agent according to the present invention had a higher desulfurization rate than the conventional desulfurizing agent, and the final sulfur concentration was 0.003% by mass or less in all cases. The desulfurization rate in FIG. 1 and Table 2 is (% after treatment [%
S] −Before treatment [% S]) / Before treatment [% S] × 100.
【００２８】[0028]
【表２】 [Table 2]
【００２９】また、この実施例で使用した金属Ｍｇは、
表２より明らかなように、従来利用価値が低く投棄され
ていた産業廃棄物に近いもので、金属鉄は、同様に電気
炉での低級鋼製造の原料になっていたダライ粉等の低品
位スクラップ、製鉄ダスト等を使用している。従って、
本発明に係る脱硫剤は従来品より安価に製造でき、脱硫
処理費用の大幅な低減が達成できた。また、Ｍｇの強力
な脱硫能力のおかげで脱硫剤の原単位が低減でき、発生
するスラグ量も顕著に低くなった。さらに、本発明で
は、耐火物で保護した鉄パイプを多量に用いたり、高価
なインジェクション装置を必要とせず、単に溶銑の注入
流に合わせて添加するか、機械撹拌している溶銑表面上
に添加するだけで良いので、設備投資面での効果も期待
できる。The metal Mg used in this embodiment is:
As is evident from Table 2, similar to industrial waste that was conventionally discarded with low utility value, metallic iron is also low-grade, such as Dalai powder, which was also used as a raw material for low-grade steel production in electric furnaces. Scrap, steelmaking dust, etc. are used. Therefore,
The desulfurizing agent according to the present invention can be manufactured at a lower cost than conventional products, and a large reduction in desulfurization treatment cost can be achieved. In addition, thanks to the strong desulfurization ability of Mg, the basic unit of the desulfurizing agent could be reduced, and the amount of generated slag was significantly reduced. Furthermore, in the present invention, a large amount of iron pipe protected by a refractory is not used, and an expensive injection device is not required, and it is simply added in accordance with the injection flow of hot metal, or added on the surface of hot metal with mechanical stirring. It can be expected to have an effect on capital investment.
【００３０】[0030]
【発明の効果】以上述べたように、本発明により、溶銑
からの脱硫が、従来より脱硫効率を高く、且つ安価に実
施可能になった。As described above, according to the present invention, desulfurization from hot metal can be performed with higher desulfurization efficiency and lower cost than before.
【図１】脱硫剤中の金属Ｍｇ含有量と溶銑の脱硫効率と
の関係を示す図である。FIG. 1 is a graph showing the relationship between the content of metallic Mg in a desulfurizing agent and the desulfurization efficiency of hot metal.
【図２】本発明に係る脱硫剤の１個の形状例を示す図で
あり、（ａ）及び（ｂ）はブリケット状、（ｃ）は角
状、（ｄ）はタブレット（錠剤）状、（ｅ）は球状のも
のである。FIG. 2 is a view showing one example of the shape of a desulfurizing agent according to the present invention, wherein (a) and (b) are briquettes, (c) is square, (d) is tablets (tablets), (E) is spherical.
【図３】塊状体の中心部分をＭｇに富む物質、表面部分
を金属鉄に富む物質で形成した本発明に係る脱硫材の一
例を示す図である。FIG. 3 is a view showing an example of a desulfurizing material according to the present invention in which a central portion of a lump is formed of a material rich in Mg and a surface portion is formed of a material rich in metallic iron.
１ 金属Ｍｇに富む物質 ２ 金属鉄に富む物質 ３ １個の塊状体（脱硫剤） 1 Substance rich in metallic Mg 2 Substance rich in metallic iron 3 One lump (desulfurizing agent)
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２１Ｃ 7/076 Ｃ２１Ｃ 7/076 Ａ (71)出願人 500196021 興和金属株式会社 尼崎市三反田町３丁目４番７号 (72)発明者 竹内 秀次 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社技術研究所内 (72)発明者 吉田 豊 西宮市西宮浜２丁目34番 株式会社吉田鐵 工所内 (72)発明者 岩見 暁 大阪市淀川区西中島７丁目１番26号 新大 阪地産ビル８階 日本マテリアル株式会社 内 (72)発明者 栂村 明紀 尼崎市三反田町３丁目４番７号 興和金属 株式会社内 Ｆターム(参考） 4K013 BA05 CA12 CB02 CB04 CB09 CC08 CF13 DA05 DA10 DA13 EA02 EA03 EA04 EA05 EA09 EA13 EA16 EA23 EA36 EA39 4K014 AA02 AB02 AB03 AB04 AB09 AB13 AB16 AB21 AB28 AC08 AC14 AC16 AD01 AD23 Continuation of the front page (51) Int.Cl. 7 Identification code FI Theme coat II (Reference) C21C 7/076 C21C 7/076 A (71) Applicant 500196021 Kowa Metal Co., Ltd. 3- 4-7 Mitandamachi, Amagasaki-shi ( 72) Inventor Shuji Takeuchi 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Pref. In the Technical Research Institute of Kawasaki Steel Co., Ltd. (72) Inventor Yutaka Yoshida 2-34 Nishimiyahama, Nishinomiya-shi In the Yoshida Iron Works Co., Ltd. (72) Inventor Akira Iwami 7-26 Nishinakajima, Yodogawa-ku, Osaka 8th floor of Shin-Osaka district building Nippon Material Co., Ltd. (72) Inventor Akiki Tsugamura 3-4-7 Mitandamachi, Amagasaki-shi Kowa Metal Co., Ltd. F Terms (reference) 4K013 BA05 CA12 CB02 CB04 CB09 CC08 CF13 DA05 DA10 DA13 EA02 EA03 EA04 EA05 EA09 EA13 EA16 EA23 EA36 EA39 4K014 AA02 AB02 AB03 AB04 AB09 AB13 AB16 AB21 AB28 AC08 AC14 AC16 AD01 AD23
Claims (6)
粉粒状の金属鉄もしくは鉄合金とを混合し、見かけ比重
が３以上の塊状体に加圧成形したことを特徴とする溶銑
脱硫剤。1. A powdered metal Mg or Mg alloy,
A hot metal desulfurizing agent characterized by being mixed with powdered metal iron or an iron alloy and pressure-formed into a block having an apparent specific gravity of 3 or more.
は脱硫時に形成するスラグの融点を低下させる物質を混
合させたことを特徴とする請求項１記載の溶銑脱硫剤。2. The hot metal desulfurizing agent according to claim 1, further comprising a substance having a desulfurizing function and / or a substance that lowers the melting point of slag formed during desulfurization.
体の中心部分に多く、金属鉄もしくは鉄合金を、成形体
の表面部分に多く存在させたことを特徴とする請求項１
又は２記載の溶銑脱硫剤。3. The molded product according to claim 1, wherein a large amount of said metal Mg or Mg alloy is present in a central portion of said compact and a large amount of metallic iron or iron alloy is present in a surface portion of said compact.
Or the hot metal desulfurizing agent according to 2.
際して、 前記容器内に、請求項１〜３のいずれかに記載の脱硫剤
を予め装入し、その上に溶銑を注入することを特徴とす
る溶銑脱硫剤の使用方法。4. When desulfurizing hot metal held in a container, the desulfurizing agent according to any one of claims 1 to 3 is charged into the container in advance, and hot metal is injected onto the desulfurizing agent. How to use hot metal desulfurizing agent.
際して、 前記容器に溶銑を注入すると同時に、請求項１〜３のい
ずれかに記載の脱硫剤を添加することを特徴とする溶銑
脱硫剤の使用方法。5. A desulfurizing agent for hot metal, wherein the desulfurizing agent according to claim 1 is simultaneously added to the hot metal in the container when desulfurizing the hot metal held in the container. How to use
際して、 前記容器内の溶銑を機械撹拌により回転させ、その溶銑
表面上に請求項１〜３のいずれかに記載の脱硫剤を添加
することを特徴とする溶銑脱硫剤の使用方法。6. When desulfurizing hot metal held in a container, the hot metal in the container is rotated by mechanical stirring, and the desulfurizing agent according to claim 1 is added to the surface of the hot metal. A method for using a hot metal desulfurizing agent, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000126799A JP2001303116A (en) | 2000-04-27 | 2000-04-27 | Desulfurizing agent for molten iron and its using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000126799A JP2001303116A (en) | 2000-04-27 | 2000-04-27 | Desulfurizing agent for molten iron and its using method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001303116A true JP2001303116A (en) | 2001-10-31 |
Family
ID=18636501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000126799A Withdrawn JP2001303116A (en) | 2000-04-27 | 2000-04-27 | Desulfurizing agent for molten iron and its using method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001303116A (en) |
Cited By (6)
| 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 |
| JP2007224349A (en) * | 2006-02-22 | 2007-09-06 | Aisin Seiki Co Ltd | Method for treating magnesium alloy cut waste |
| JP2008138253A (en) * | 2006-12-01 | 2008-06-19 | Nippon Steel Corp | Desulfurization refining agent for molten pig iron, and desulfurization method |
| KR101423593B1 (en) * | 2012-12-27 | 2014-07-25 | 주식회사 포스코 | Briquette-Type Desulfurizing Agent for Molten Iron |
| CN113350997A (en) * | 2021-06-08 | 2021-09-07 | 云南民族大学 | Method and system for wet removal of sulfur dioxide from blast furnace ironmaking dust |
| CN114182054A (en) * | 2021-12-09 | 2022-03-15 | 青阳县迎春炉料有限公司 | Blast furnace molten iron purifying agent and preparation process thereof |
-
2000
- 2000-04-27 JP JP2000126799A patent/JP2001303116A/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 |
| JP2007224349A (en) * | 2006-02-22 | 2007-09-06 | Aisin Seiki Co Ltd | Method for treating magnesium alloy cut waste |
| JP2008138253A (en) * | 2006-12-01 | 2008-06-19 | Nippon Steel Corp | Desulfurization refining agent for molten pig iron, and desulfurization method |
| KR101423593B1 (en) * | 2012-12-27 | 2014-07-25 | 주식회사 포스코 | Briquette-Type Desulfurizing Agent for Molten Iron |
| CN113350997A (en) * | 2021-06-08 | 2021-09-07 | 云南民族大学 | Method and system for wet removal of sulfur dioxide from blast furnace ironmaking dust |
| CN113350997B (en) * | 2021-06-08 | 2023-11-14 | 云南民族大学 | Method and system for removing sulfur dioxide from blast furnace ironmaking dust by wet method |
| CN114182054A (en) * | 2021-12-09 | 2022-03-15 | 青阳县迎春炉料有限公司 | Blast furnace molten iron purifying agent and preparation process thereof |
| CN114182054B (en) * | 2021-12-09 | 2023-02-03 | 青阳县迎春炉料有限公司 | Blast furnace molten iron purifying agent and preparation process thereof |
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