JP2001348610A - Slag formation promoter - Google Patents
Slag formation promoterInfo
- Publication number
- JP2001348610A JP2001348610A JP2000170227A JP2000170227A JP2001348610A JP 2001348610 A JP2001348610 A JP 2001348610A JP 2000170227 A JP2000170227 A JP 2000170227A JP 2000170227 A JP2000170227 A JP 2000170227A JP 2001348610 A JP2001348610 A JP 2001348610A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- flux
- slag
- refining
- quicklime
- 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- Withdrawn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
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、転炉で鋼の脱燐精
錬を行う際に用いる、スラグの滓化を促進させるための
滓化促進剤に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slagging accelerator for promoting slagging of slag, which is used when dephosphorizing and refining steel in a converter.
【０００２】[0002]
【従来の技術】鉄鋼業においては、従来より転炉を用い
て溶銑の燐や炭素等の元素を除く、酸化精錬法を用いて
きた。この精錬法の利点は、数分という短時間で数百ト
ンの溶鋼を製造しうるという高生産性を有することであ
る。この高生産性精錬の特徴を活かして、近年、転炉の
中で脱燐と脱炭を分離する試みがなされている。この場
合には、まず脱燐反応に有利な１３５０℃程度の低温域
で脱燐を行い、しかる後に脱炭を実施している。この場
合の脱燐反応としては、ＣａＯを主成分とするスラグを
作り、溶鋼中の燐を酸化させて燐酸とした後にスラグに
吸収させる方法をとる。2. Description of the Related Art In the iron and steel industry, an oxidizing refining method has conventionally been used in which a converter is used to remove elements such as phosphorus and carbon in hot metal. The advantage of this refining method is that it has a high productivity of producing hundreds of tons of molten steel in a short time of several minutes. In recent years, attempts have been made to separate dephosphorization and decarburization in a converter utilizing the characteristics of this high-productivity refining. In this case, dephosphorization is first performed at a low temperature of about 1350 ° C., which is advantageous for the dephosphorization reaction, and then decarburization is performed. As the dephosphorization reaction in this case, a method is used in which slag containing CaO as a main component is produced, phosphorous in molten steel is oxidized to phosphoric acid, and then absorbed in the slag.
【０００３】しかし、転炉の吹錬初期は炉内温度が低い
ため、生石灰単体ではスラグに溶解しにくく、従来は蛍
石を添加して、蛍石中のフッ素の作用により生石灰を溶
解させて、溶融スラグを生成させていた。このようにフ
ッ素源を添加すると、排出されたスラグにもフッ素が含
まれ、スラグの再利用の形態によっては、フッ素が溶出
する可能性が有ることが知られている。[0003] However, since the temperature inside the furnace is low in the initial stage of blowing of the converter, it is difficult for the lime alone to dissolve in the slag. Conventionally, fluorite is added and the lime is dissolved by the action of fluorine in the fluorite. , Producing molten slag. It is known that when a fluorine source is added in this manner, the discharged slag also contains fluorine, and depending on the form of reuse of the slag, there is a possibility that fluorine is eluted.
【０００４】しかしながら、蛍石を使用しないで脱燐精
錬を行うと、スラグの融点が高くなってスラグが溶解せ
ず（すなわち滓化性が悪くなり）、脱燐反応速度を低下
させるとともに、脱燐反応に寄与するスラグの割合が小
さくなり、多量のスラグを用いなければ十分な脱燐率が
得られない。これにより、転炉の生産性が低下するとと
もに、スラグ排出量が増加する結果になっている。[0004] However, if dephosphorization refining is performed without using fluorite, the melting point of the slag increases and the slag does not dissolve (that is, the slagging property deteriorates), and the dephosphorization reaction rate is reduced and the dephosphorization reaction is performed. The proportion of slag contributing to the phosphorus reaction becomes small, and a sufficient dephosphorization rate cannot be obtained unless a large amount of slag is used. This results in reduced converter productivity and increased slag emissions.
【０００５】そのため、従来からフッ素源を用いずに、
転炉スラグの滓化性を高める手段が種々提案されてお
り、例えば特開平１１−７１６１１号公報には、「粉状
の水酸化カルシウム又は粉状の水酸化カルシウムと粉状
の生石灰との混合物からなる金属精錬用石灰系フラック
ス」が開示されている。このフラックスは、水酸化カル
シウムの熱分解で生成する高活性のＣａＯにより、その
滓化性を高めようとするものであるが、かかるフラック
スを用いても、転炉吹錬初期の低温域においては、十分
な滓化性を確保しうるとは云い難い。Therefore, conventionally, without using a fluorine source,
Various means for improving the slagging properties of converter slag have been proposed. For example, JP-A-11-71611 discloses "a powdered calcium hydroxide or a mixture of powdered calcium hydroxide and powdered quicklime. A lime-based flux for metal refining comprising: This flux is intended to enhance its slagging property by highly active CaO generated by thermal decomposition of calcium hydroxide. However, even with such a flux, in the low temperature range in the early stage of converter blowing, However, it is difficult to say that sufficient slagging property can be ensured.
【０００６】[0006]
【発明が解決しようとする課題】本発明の課題は、蛍石
を用いない転炉精錬において、スラグの溶解（滓化）性
を高めて、蛍石を使用した場合と同じ程度に脱燐反応を
促進させうる手段を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to improve the melting (slagification) of slag in converter refining without using fluorite, and to remove phosphorus to the same extent as when fluorite is used. Is to provide means that can promote
【０００７】[0007]
【課題を解決するための手段】転炉吹錬の初期には、ま
ずＳｉの酸化が起こり、同時に鉄が酸化されて酸化鉄が
生成し、Ｓｉの酸化がほぼ終了した時点から燐の酸化速
度が大きくなることが知られている。本発明者らが吹錬
初期のスラグの組成変化について検討した結果、吹錬開
始後２分程度でＳｉの酸化が完了し、ＳｉＯ2と酸化鉄
に富むスラグが形成されることを知見した。したがっ
て、脱燐反応を効率的に進行させるには、吹錬開始時に
添加されたＣａＯ源が、この２分間内にスラグ中に溶解
することが望ましい。In the early stage of converter blowing, oxidation of Si occurs first, and at the same time, iron is oxidized to form iron oxide. Is known to increase. The present inventors have studied the composition change of slag at the beginning of blowing, and found that oxidation of Si is completed in about 2 minutes after the start of blowing, and a slag rich in SiO 2 and iron oxide is formed. Therefore, in order for the dephosphorization reaction to proceed efficiently, it is desirable that the CaO source added at the start of blowing be dissolved in the slag within the two minutes.
【０００８】一方、本発明者らは、ＳｉＯ2と酸化鉄の
溶融物中への生石灰の溶解速度について、小規模実験で
検討した。その結果、溶融スラグが生石灰粒子中に浸透
して反応生成物をつくることにより生石灰の溶解が進行
すること、およびこの浸透深さが時間の関数であること
が見出された。したがって、生石灰粒子の微細化は、界
面積の増大効果と必要浸透深さを小さくする効果によ
り、きわめて顕著に生石灰粒子の溶解速度を増大させ
る。また、２分間以内に溶解させるためには、生石灰の
粒子径を５００μｍ以下にする必要があることが知見さ
れた。On the other hand, the present inventors studied the dissolution rate of quicklime in a melt of SiO 2 and iron oxide in a small-scale experiment. As a result, it was found that melting of the quicklime progressed by the molten slag penetrating into the quicklime particles to form a reaction product, and that the penetration depth was a function of time. Therefore, miniaturization of quicklime particles significantly increases the dissolution rate of quicklime particles due to the effect of increasing the interfacial area and the effect of reducing the required penetration depth. In addition, it has been found that it is necessary to reduce the particle size of quicklime to 500 μm or less in order to dissolve it within 2 minutes.
【０００９】次ぎに、粉体供給ランスのような設備を用
いずに、このような微粉を炉内に供給する方法について
検討した。袋詰めした微粉を炉内に投入する方法では、
大部分が集塵器に飛散ロスするため適切でない。また、
従来から粉状原料をペレット状に造粒して炉内に投入す
る方法も多用されているが、通常の造粒法では、浴表面
に堆積したペレットが分散することなく滞留し、１３５
０℃程度の温度では、逆に生石灰粒子が互いに焼結して
大きな塊となり、有効に溶融スラグと反応しないことが
判明した。Next, a method of supplying such fine powder into the furnace without using equipment such as a powder supply lance was studied. In the method of charging the bagged fine powder into the furnace,
Most of them are not appropriate because scattering loss occurs in the dust collector. Also,
Conventionally, a method of granulating a powdery raw material into pellets and charging the pellets into a furnace has been frequently used. However, in a usual granulation method, pellets deposited on a bath surface stay without being dispersed, and 135
At a temperature of about 0 ° C., it was found that, on the contrary, the quicklime particles sintered to each other to form large lumps and did not effectively react with the molten slag.
【００１０】そこで、本発明者らは、造粒用のバインダ
ーとして、高温で熱分解して急激なガス発生を伴う物質
を用いることを着想し、種々検討の結果、適量の澱粉を
バインダーとして用いることにより、生石灰粒子を速や
かにスラグ中に分散させうることを知見した。Therefore, the present inventors have conceived of using a substance which is thermally decomposed at a high temperature and rapidly generates gas as a binder for granulation, and as a result of various investigations, used an appropriate amount of starch as a binder. Thereby, it was found that quicklime particles can be rapidly dispersed in slag.
【００１１】本発明は上記の知見に基いてなされたもの
であって、本発明の要旨は、粒径５００μｍ以下の生石
灰粉を５０重量％以上含む精錬用フラックスに、該フラ
ックスに対する重量比で５〜２０％の澱粉を添加・混合
し、この混合物を５０ｍｍ以下のペレット状に成形した
ことを特徴とする滓化促進剤である。The present invention has been made based on the above findings. The gist of the present invention is to provide a refining flux containing 50% by weight or more of quicklime having a particle size of 500 μm or less in a weight ratio of 5% to the flux.滓 20% of starch is added and mixed, and this mixture is formed into a pellet of 50 mm or less.
【００１２】上記の精錬用フラックスは、そのうちの２
〜１０重量％がアルミナ粉であり、残部が実質的に粒径
５００μｍ以下の生石灰粉からなるものであってもよ
い。The above-mentioned refining flux has two of
10 to 10% by weight may be alumina powder, and the remainder may be composed of quicklime powder having a particle size of substantially 500 μm or less.
【００１３】また、上記の精錬用フラックスは、そのう
ちの１０〜５０重量％が酸化鉄粉であり、残部が実質的
に粒径５００μｍ以下の生石灰粉からなるものであって
もよい。[0013] The above-mentioned refining flux may be composed of 10-50% by weight of iron oxide powder and the rest substantially of quicklime powder having a particle size of 500 µm or less.
【００１４】さらに、上記の精錬用フラックスは、上記
諸成分に加えて、該フラックス全量に対するＮａ2Ｏ分
の重量比で０．５〜５％に相当するソーダ灰又はソーダ
ガラス粉末を含有するものであってもよい。Further, the refining flux contains soda ash or soda glass powder corresponding to 0.5 to 5% by weight of Na 2 O relative to the total amount of the flux, in addition to the above components. It may be.
【００１５】[0015]
【発明の実施の形態】本発明の滓化促進剤は、粒径５０
０μｍ以下の生石灰粉を５０重量％以上含む精錬用フラ
ックスに、該フラックスに対する重量比で５〜２０％の
澱粉を添加・混合し、この混合物を５０ｍｍ以下のペレ
ット状に成形してなるものである。BEST MODE FOR CARRYING OUT THE INVENTION The slagging accelerator of the present invention has a particle size of 50%.
A refining flux containing 50% by weight or more of quicklime powder having a particle size of 0 μm or less is mixed with a starch having a weight ratio of 5 to 20% with respect to the flux, and the mixture is formed into pellets having a size of 50 mm or less. .
【００１６】上記の精錬用フラックスは、粒径（粒子が
通過する篩の目開きで評価した粒径）が５００μｍ以下
の生石灰粉（以下、これを「生石灰細粉」という）を５
０重量％以上含むものであればよい。その全部が生石灰
細粉であってもよいが、一部（５０重量％以内で）フッ
素を含まない他の造滓成分粉末（例えばＡｌ2Ｏ3、Ｍｇ
Ｏ、ＳｉＯ2等のソース）、酸化鉄粉、生石灰粗粉等を
含むものであってもよい。生石灰細粉の粒径の上限を５
００μｍとする理由は、すでに述べたように、これを越
えると吹錬開始から２分間以内に生石灰の主要な部分を
スラグに溶解させるという目的が達せられないためてあ
る。The above-mentioned refining flux contains 5 g of quicklime powder (hereinafter referred to as "quicklime powder") having a particle size (particle size evaluated by the size of a sieve through which the particles pass) of 500 μm or less.
What is necessary is just to contain 0 weight% or more. The whole may be fine lime fine powder, but some (within 50% by weight) other slag-making component powders (for example, Al 2 O 3 , Mg
O, SiO 2, etc.), iron oxide powder, quicklime coarse powder, and the like. Upper limit of particle size of quicklime powder is 5
The reason why the thickness is set to 00 μm is that, as already described, if it exceeds this, the purpose of dissolving the main portion of quicklime in the slag within 2 minutes from the start of blowing cannot be achieved.
【００１７】本発明で澱粉を用いる理由は、これが造粒
時のバインダーとしての機能し、かつ炉内で急激なガス
発生により成形物を崩壊させる機能を有するためであ
る。したがって、本発明で用いる澱粉は上記の機能を有
するものであればよく、そのソースについて限定を要し
ないが、経済的理由から工業用澱粉を用いることが好ま
しい。澱粉は、工業的にはじゃがいも、さつまいも、ト
ウモロコシ等を原料として製造される。通常は、これら
の原料を磨砕して乳液と澱粉粕に分離し、乳液を澱粉分
離等の工程で濃縮した後、脱水・乾燥して乾澱粉が製造
される。本発明においては、上記の乾澱粉を用いても、
脱水・乾燥前の濃縮澱粉液も用いてもよく、或いはこれ
らを混合して用いてもよい。The reason why starch is used in the present invention is that it functions as a binder at the time of granulation and has a function of disintegrating a molded product by rapid gas generation in a furnace. Therefore, the starch used in the present invention may be any one having the above-mentioned functions, and the source thereof is not limited, but it is preferable to use industrial starch for economic reasons. Starch is industrially produced using potatoes, sweet potatoes, corn and the like as raw materials. Usually, these raw materials are ground to separate into emulsion and starch cake, and the emulsion is concentrated in a process such as starch separation, and then dried and dried to produce dry starch. In the present invention, even when using the above dry starch,
A concentrated starch solution before dehydration and drying may be used, or a mixture thereof may be used.
【００１８】澱粉の添加比（精錬用フラックスの乾重量
に対する澱粉の乾重量の比）を５〜２０％とする理由
は、これが５％未満ではペレットの形状を維持するため
のバインダーとしての機能が不十分となり、これが２０
％を越えると、澱粉中の水素に起因して溶鋼中の水素量
が増加するおそれがあるためである。The reason why the starch addition ratio (the ratio of the dry weight of starch to the dry weight of the refining flux) is 5 to 20% is that if it is less than 5%, the function as a binder for maintaining the shape of the pellets is lost. Insufficient, this is 20
%, The amount of hydrogen in the molten steel may increase due to the hydrogen in the starch.
【００１９】なお、実験室における検討では、芋類を原
料とする澱粉よりも、トウモロコシを原料とする澱粉
（コーンスターチ）を用いる方が、成形後の造粒物の強
度（常温での耐崩壊性）が若干優れているように見受け
られた。これは、微視的に見た澱粉粒子の形状が、芋類
の澱粉とコーンスターチで微妙に異なることによると考
えられる。In a laboratory study, it was found that using starch (corn starch) made of corn as a raw material rather than starch made of potatoes as a raw material has a higher strength (disintegration resistance at room temperature) after granulation. ) Seemed to be slightly better. This is thought to be due to the fact that the shape of the starch particles when viewed microscopically is slightly different between starch of potatoes and corn starch.
【００２０】粉状原料を粒状（顆粒を除く）又は塊状に
造粒した成形物は、ペレット、ブリケット、タブレット
等の語で呼称されるが、本発明における「ペレット状の
成形物」は、これらの全てを含む広義のものである。ま
た、粒状又は塊状に成形する手段は、転動造粒法と圧密
造粒法に大別され、後者はさらに、プレスやブリケット
マシン等による圧縮法とスクリュー等による押圧法に分
類されるが、本発明において粉状原料をペレット状に成
形する手段は、上記のいずれであってもよく、またこれ
らに限定されるものではない。A molded product obtained by granulating a powdery raw material into granules (excluding granules) or a lump is referred to as pellets, briquettes, tablets and the like. In a broad sense that includes all of Means for forming into granules or lump are broadly classified into rolling granulation and compaction granulation, and the latter is further classified into a compression method using a press or a briquette machine and a pressing method using a screw. In the present invention, the means for forming the powdery raw material into pellets may be any of the above, and is not limited thereto.
【００２１】また、本発明において、成形物の最大径を
５０ｍｍに限定する理由は、これを越えると成形物の強
度が不十分となって、ハンドリング時の粉の発生率が大
きくなるためである。なお、上記の手段で製造された成
形物は、未乾燥で使用してもよく、必要に応じて適度の
乾燥を加えてもよいが、過度に加熱して澱粉を熱分解さ
せることは避けなければならない。In the present invention, the reason why the maximum diameter of the molded product is limited to 50 mm is that if it exceeds this, the strength of the molded product becomes insufficient, and the generation rate of powder during handling increases. . The molded product produced by the above means may be used undried or may be appropriately dried if necessary.However, it is necessary to avoid excessive heating to thermally decompose the starch. Must.
【００２２】また、前記の精錬用フラックスは、２〜１
０重量％のアルミナ粉を含み、残部が実質的に生石灰細
粉からなるものであることが好ましい。アルミナ粉を添
加する理由は、ＣａＯ−ＳｉＯ2−ＦｅＯx系スラグにＡ
ｌ2Ｏ3を添加すると、より低融点化され、ＣａＯの溶解
に有利になるためである。アルミナ粉の含有量を２％以
上とする理由は、これ未満では上記の低融点化効果がほ
とんど期待できず、１０％を越えると、逆にスラグの粘
性が高くなって好ましくないためである。なお、上記の
アルミナ粉は、Ａｌ2Ｏ3を主成分とする粉末であればよ
く、そのソースは限定を要しない。またその粒度も、造
粒上支障のない程度の粒度（例えば１ｍｍ程度以下）で
あればよい。The refining flux is 2 to 1
It is preferable that the powder contains 0% by weight of alumina powder and the balance substantially consists of quicklime fine powder. The reason for adding alumina powder is that CaO—SiO 2 —FeO x based slag
This is because the addition of l 2 O 3 lowers the melting point, which is advantageous for dissolving CaO. The reason why the content of the alumina powder is set to 2% or more is that if the content is less than this, the above-mentioned effect of lowering the melting point can hardly be expected, and if it exceeds 10%, the viscosity of the slag is undesirably high. The above alumina powder may be any powder containing Al 2 O 3 as a main component, and its source is not limited. Also, the particle size may be any particle size that does not hinder granulation (for example, about 1 mm or less).
【００２３】また、前記の精錬用フラックスは、１０〜
５０重量％の酸化鉄粉を含み、残部が実質的に生石灰細
粉からなるものであることが好ましい。その理由は、成
形物を転炉内に投入した場合に、成形物を構成する酸化
鉄粉の周囲で、一部ＣａＯが溶解して、生石灰の滓化を
促進する効果が大きいためである。The refining flux is 10 to
It is preferred that the powder contains 50% by weight of iron oxide powder and the balance substantially consists of quicklime fine powder. The reason is that when the molded product is put into the converter, CaO partially dissolves around the iron oxide powder constituting the molded product, and has a large effect of accelerating the formation of quicklime.
【００２４】すなわち、ＣａＯ−酸化鉄の二元系状態図
に見られるように、１１３０℃以上で酸化鉄が１２％以
上になると、酸化鉄融液と固体ＣａＯが共存する状態に
なり、酸化鉄が７５％以上になると、酸化鉄とＣａＯが
共存する融液が生成する。したがって、炉内で成形物が
１３００℃近くまで加熱されると、酸化鉄粒子の周囲
に、ＦｅＯx−ＣａＯの融液が生成することになり、こ
れが生石灰の滓化の促進に寄与するためである。That is, as shown in the binary phase diagram of CaO-iron oxide, when the iron oxide becomes 12% or more at 1130 ° C. or more, the iron oxide melt and solid CaO coexist, and the iron oxide becomes coexistent. Is 75% or more, a melt in which iron oxide and CaO coexist is generated. Therefore, when the molded article is heated to about 1300 ° C. in the furnace, a melt of FeO x —CaO is generated around the iron oxide particles, which contributes to the promotion of slag formation of quicklime. is there.
【００２５】フラックス中の酸化鉄粉の含有量を１０〜
５０重量％とする理由は、１０％未満では、上記の効果
がほとんど期待できず、一方５０％を越えると、相対的
に生石灰細粉の含有量が少くなり、かつ酸化鉄の還元に
伴う吸熱量が大きくなって好ましくないためである。な
お、酸化鉄粉のソースはとくに限定を要せず、例えば、
粉鉱石、ミルスケール、転炉ダスト等のいずれであって
もよく、その粒度も造粒上支障のない程度であればよ
い。The content of iron oxide powder in the flux is 10 to
The reason for setting the content to 50% by weight is that if the content is less than 10%, the above effect can hardly be expected. On the other hand, if it exceeds 50%, the content of quicklime fine powder becomes relatively small and the absorption accompanying reduction of iron oxide is reduced. This is because the amount of heat is undesirably increased. The source of the iron oxide powder does not need to be particularly limited, for example,
Any of fine ore, mill scale, converter dust, and the like may be used, and the particle size may be an extent that does not cause a problem in granulation.
【００２６】さらに、上記の精錬用フラックスは、生石
灰細粉を主体とする場合や、これにアルミナ粉又は酸化
鉄粉を添加した場合のいずれにおいても、フラックス全
量に対するＮａ2Ｏ分の重量比で０．５〜５％に相当す
るソーダ灰又はソーダガラス粉末を含有することが好ま
しい。Further, the refining flux described above has a weight ratio of Na 2 O to the total amount of the flux in the case where the quick lime fine powder is mainly used or the case where alumina powder or iron oxide powder is added thereto. It preferably contains 0.5 to 5% of soda ash or soda glass powder.
【００２７】その理由は、Ｎａ2Ｏがスラグの融点を低
下させて、生石灰の滓化を促進すること、およびＮａ2
Ｏが酸化鉄の活量を大きくしてその反応性を増大させる
ため、滓化促進の効果を有することによる。実際に後記
実施例に示すように、２％程度のＮａ2Ｏの添加で、脱
燐速度が大幅に増大することが確められた。[0027] The reason is that the Na 2 O is to lower the melting point of the slag to facilitate slag formation of quicklime, and Na 2
O increases the activity of iron oxide to increase its reactivity, and therefore has the effect of promoting slagging. Actually, as shown in Examples described later, it was confirmed that the addition of about 2% of Na 2 O greatly increased the dephosphorization rate.
【００２８】Ｎａ2Ｏ分の重量比を０．５〜５％の範囲
内とする理由は、０．５％未満では、Ｎａ2Ｏによる上
記の効果がほとんどなく、５％をこえるとＮａ分の蒸発
が多くなり、それ以上脱燐促進の効果が得られず、かつ
作業環境上好ましくなくなるためである。The reason why the weight ratio of Na 2 O is set in the range of 0.5 to 5% is that if the content is less than 0.5%, the above-mentioned effect due to Na 2 O is scarce, and if it exceeds 5%, the content of Na This is because the evaporation of water increases, the effect of accelerating dephosphorization cannot be obtained any more, and it is not preferable in working environment.
【００２９】Ｎａ2Ｏのソースとしては、ソーダ灰、ソ
ーダガラス粉末又はこれらの混合物を用いる。ソーダ灰
は、脱硫等の精錬剤として用いられるものを使用すれば
良く、ソーダガラス粉末は、ソーダ（石灰）ガラスの製
品、半製品、カレット等を粉砕したものを用いればよ
い。なお、ソーダ灰（Ｎａ2Ｏ分５０〜６０％）を用い
る場合には、Ｎａ分が蒸発・飛散ロスし易いので、その
添加量をやや多目にし（ソーダ灰で２〜１０％程度）、
ソーダガラス粉末（Ｎａ2Ｏ分１０〜２０％）を用いる
場合は、その添加量をやや少な目に（ソーダガラス粉末
で５〜２０％程度）すればよい。As a source of Na 2 O, soda ash, soda glass powder or a mixture thereof is used. Soda ash may be used as a refining agent for desulfurization or the like, and soda glass powder may be obtained by pulverizing soda (lime) glass products, semi-finished products, cullet and the like. When soda ash (Na 2 O content: 50 to 60%) is used, the amount of addition is slightly increased (about 2 to 10% for soda ash) because the Na content is easily evaporated and scattered and lost.
When soda glass powder (Na 2 O content: 10 to 20%) is used, the amount of addition may be slightly smaller (about 5 to 20% for soda glass powder).
【００３０】[0030]
【実施例】商用の上底吹き転炉を用いて溶銑の脱燐処理
を行うに際して、本発明の滓化促進剤と従来の精錬剤と
で、脱燐挙動を比較した。EXAMPLES When dephosphorizing hot metal using a commercial top and bottom blown converter, the dephosphorization behavior of the slagging accelerator of the present invention and a conventional refining agent were compared.
【００３１】本発明の滓化促進剤の原料としては、Ｃａ
Ｏ９５％以上の生石灰細粉（製鋼用生石灰を粉砕して５
００μｍ以下に篩分したもの）、Ａｌ2Ｏ3９５％以上の
アルミナ粉（粒径１０００μｍ以下）、脱硫用ソーダ灰
（Ｎａ2ＣＯ3９８％以上）、ソーダガラスカレットを破
砕したソーダガラス粉末（粒径１０００μｍ以下）を用
いた。また、澱粉としては、トウモロコシを原料とする
工業用の乾燥澱粉（水分１５％以下）を用いた。表１
に、各実施例におけるフラックスの配合比と澱粉の添加
比を示す。本発明の滓化促進剤の成形方法は、上記の配
合原料をミキサーにて十分混合し、ブリケットマシンで
約２０×２０×２０ｍｍの大きさに成形し、これを未乾
燥で使用した。As a raw material of the slagging accelerator of the present invention, Ca
O95% or more quicklime fine powder (crushed quicklime for steel making 5
Sieved to 00 μm or less), alumina powder of 95% or more Al 2 O 3 (particle diameter of 1000 μm or less), soda ash for desulfurization (98% or more of Na 2 CO 3 ), soda glass powder obtained by crushing soda glass cullet ( Particle size of 1000 μm or less). In addition, as the starch, industrial dry starch (water content: 15% or less) using corn as a raw material was used. Table 1
Table 2 shows the mixing ratio of the flux and the addition ratio of the starch in each Example. In the molding method of the slag formation accelerator of the present invention, the above-mentioned raw materials were sufficiently mixed by a mixer, formed into a size of about 20 × 20 × 20 mm by a briquette machine, and used undried.
【００３２】[0032]
【表１】 [Table 1]
【００３３】一方比較例として、従来の塊状生石灰のみ
を用いた場合（比較例１）と、塊状生石灰に蛍石（生石
灰に対し、約３重量％）を添加した場合（比較例２）に
ついても、同様に脱燐挙動を調査した。On the other hand, as a comparative example, a case where only conventional lump lime is used (Comparative Example 1) and a case where fluorite (approximately 3% by weight based on quick lime) is added to lump quick lime (Comparative Example 2) Similarly, the dephosphorization behavior was investigated.
【００３４】実施例、比較例ともに使用した溶銑の組成
は、Ｃ：４．５％以上、Ｓi：０．３５〜０．４％、
Ｐ：０．１１〜０．１３％で、溶銑温度１３４０〜１３
７０℃であった。本発明の滓化促進剤、従来の精錬剤と
もに、送酸開始時に炉上バンカーから一括投入し、その
原単位は、１５〜１８ｋｇ／ｔｏｎであった。送酸開始
後の１０分間に、約２分間隔で溶鉄試料を採取し燐濃度
の推移を調査した（一部の実施例では、約７分後のデー
タのみ）。調査結果を図１に示す。The composition of the hot metal used in both the examples and the comparative examples was as follows: C: 4.5% or more, Si: 0.35 to 0.4%,
P: 0.11-0.13%, hot metal temperature 1340-13
70 ° C. Both the slag accelerating agent of the present invention and the conventional refining agent were charged all at once from the on-furnace bunker at the start of acid supply, and the basic unit was 15 to 18 kg / ton. Ten minutes after the start of the acid transfer, molten iron samples were collected at intervals of about 2 minutes and the transition of the phosphorus concentration was investigated (in some examples, only data after about 7 minutes). FIG. 1 shows the results of the investigation.
【００３５】図に見られるように、従来の精錬剤で蛍石
無添加の場合（比較例１）は、添加した場合（比較例
２）より脱燐速度が低下する。これに対して、本発明の
滓化促進剤として生石灰細粉のみを用いた場合（実施例
１）では、蛍石を用いなくても比較例２とほぼ同等の脱
燐速度が得られた。また、生石灰細粉にアルミナ粉（実
施例２）又は酸化鉄粉（実施例３）を添加した場合に
は、実施例１よりもやや脱燐速度が向上した。さらに、
アルミナ粉とソーダガラス粉末（実施例４）又は酸化鉄
粉とソーダ灰（実施例５）を添加した場合には、実施例
１よりもかなり大幅に脱燐速度が向上することが確めら
れた。As shown in the figure, when the conventional refining agent is used without fluorite (Comparative Example 1), the dephosphorization rate is lower than when it is added (Comparative Example 2). On the other hand, when only the quicklime powder was used as the slag accelerating agent of the present invention (Example 1), almost the same dephosphorization rate as that of Comparative Example 2 was obtained without using fluorite. Further, when the alumina powder (Example 2) or the iron oxide powder (Example 3) was added to the quicklime powder, the dephosphorization rate was slightly higher than that of Example 1. further,
When the alumina powder and the soda glass powder (Example 4) or the iron oxide powder and the soda ash (Example 5) were added, it was confirmed that the dephosphorization rate was considerably improved as compared with Example 1. .
【００３６】[0036]
【発明の効果】転炉の脱燐精錬時に本発明の滓化促進剤
を用いることにより、フッ素源を用いることなく、従来
の生石灰と蛍石を精錬剤とする場合と同等又はそれ以上
の速度で脱燐精錬を行うことができ、これにより、生産
性を抑制しないで環境に調和した溶鋼精錬を行うことが
可能になった。By using the slag accelerating agent of the present invention at the time of dephosphorization and refining in a converter, the speed is equal to or higher than that of the case where conventional quick lime and fluorite are used as the refining agent without using a fluorine source. This makes it possible to carry out dephosphorization smelting, thereby making it possible to perform smelting steel smelting in harmony with the environment without suppressing productivity.
【図１】本発明の滓化促進剤と従来の精錬剤で、転炉の
脱燐挙動を比較した結果の例を示す図である。FIG. 1 is a diagram showing an example of the result of comparing the dephosphorization behavior of a converter between a slagging accelerator of the present invention and a conventional refining agent.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 原島 和海 千葉県君津市君津１番地 新日本製鐵株式 会社君津製鐵所内 (72)発明者 矢野 峻 東京都中央区日本橋小舟町３番２号 吉澤 石灰工業株式会社内 (72)発明者 岡村 達也 東京都中央区日本橋小舟町３番２号 吉澤 石灰工業株式会社内 Ｆターム(参考） 4K002 AB04 AE01 AE10 4K013 BA03 CB09 CF01 EA01 EA02 EA03 EA05 EA29 FA05 4K014 AA03 AB01 AB02 AB03 AE01 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazumi Harashima 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Kimitsu Works (72) Inventor Shun Yano 3-2 Nihonbashi Kobunacho, Chuo-ku, Tokyo, Japan Yoshizawa Lime Industry Co., Ltd. (72) Inventor Tatsuya Okamura 3-2 Nihonbashi Kobunacho, Chuo-ku, Tokyo Yoshizawa Lime Industry Co., Ltd. F-term (reference) 4K002 AB04 AE01 AE10 4K013 BA03 CB09 CF01 EA01 EA02 EA03 EA05 EA29 FA05 4K014 AA03 AB01 AB02 AB03 AE01
Claims (4)
％以上含む精錬用フラックスに、該フラックスに対する
重量比で５〜２０％の澱粉を添加・混合し、この混合物
を５０ｍｍ以下のペレット状に成形したことを特徴とす
る滓化促進剤。1. A refining flux containing 50% by weight or more of quicklime powder having a particle size of 500 μm or less, and a starch having a weight ratio of 5 to 20% with respect to the flux is added and mixed, and the mixture is formed into pellets of 50 mm or less. A slagging accelerator characterized by being formed.
量％がアルミナ粉であり、残部が実質的に粒径５００μ
ｍ以下の生石灰粉からなることを特徴とする請求項１記
載の滓化促進剤。2. In the refining flux, 2 to 10% by weight is alumina powder, and the balance is substantially 500 μm in particle size.
2. The slag formation accelerator according to claim 1, wherein the slag formation accelerator is composed of m or less of quicklime powder.
重量％が酸化鉄粉であり、残部が実質的に粒径５００μ
ｍ以下の生石灰粉からなることを特徴とする請求項１記
載の滓化促進剤。3. The refining flux according to claim 1, wherein said flux is 10 to 50.
% By weight is iron oxide powder, and the balance is substantially 500 μm in particle size.
2. The slag formation accelerator according to claim 1, wherein the slag formation accelerator is composed of m or less of quicklime powder.
剤において、前記精錬用フラックスがさらに該フラック
ス全量に対するＮａ2Ｏ分の重量比で０．５〜５％に相
当するソーダ灰又はソーダガラス粉末を含有することを
特徴とする滓化促進剤。4. The slagging accelerator according to claim 1, wherein said refining flux further comprises 0.5 to 5% by weight of Na 2 O relative to the total amount of said flux. A slag accelerating agent containing ash or soda glass powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000170227A JP2001348610A (en) | 2000-06-07 | 2000-06-07 | Slag formation promoter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000170227A JP2001348610A (en) | 2000-06-07 | 2000-06-07 | Slag formation promoter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001348610A true JP2001348610A (en) | 2001-12-18 |
Family
ID=18672977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000170227A Withdrawn JP2001348610A (en) | 2000-06-07 | 2000-06-07 | Slag formation promoter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001348610A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100879352B1 (en) * | 2002-09-27 | 2009-01-19 | 주식회사 포스코 | Melting accelerating material of quicklime for reforming slag and the input method thereof |
| JP2010242148A (en) * | 2009-04-03 | 2010-10-28 | Nippon Steel Corp | Method of inhibiting slag adhesion to refining vessel refractory |
| KR101063329B1 (en) | 2009-04-02 | 2011-09-07 | 주식회사 포스코 | Steelmaking additives and preparation method thereof |
| JP2014077165A (en) * | 2012-10-10 | 2014-05-01 | Nippon Steel & Sumitomo Metal | Dephosphorization refining agent for molten iron |
| KR101471505B1 (en) * | 2013-03-20 | 2014-12-11 | 스톨베르그 앤드 삼일 주식회사 | Starch solution containing mold flux and the manufacturing method thereof |
| KR20180021167A (en) | 2016-01-05 | 2018-02-28 | 신닛테츠스미킨 카부시키카이샤 | Talline agent, scouring agent and talline method of molten iron |
| KR20210133016A (en) * | 2020-04-28 | 2021-11-05 | 한양대학교 에리카산학협력단 | Dephosphorization method of molten steel using fluorite replaced flux |
-
2000
- 2000-06-07 JP JP2000170227A patent/JP2001348610A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100879352B1 (en) * | 2002-09-27 | 2009-01-19 | 주식회사 포스코 | Melting accelerating material of quicklime for reforming slag and the input method thereof |
| KR101063329B1 (en) | 2009-04-02 | 2011-09-07 | 주식회사 포스코 | Steelmaking additives and preparation method thereof |
| JP2010242148A (en) * | 2009-04-03 | 2010-10-28 | Nippon Steel Corp | Method of inhibiting slag adhesion to refining vessel refractory |
| JP2014077165A (en) * | 2012-10-10 | 2014-05-01 | Nippon Steel & Sumitomo Metal | Dephosphorization refining agent for molten iron |
| KR101471505B1 (en) * | 2013-03-20 | 2014-12-11 | 스톨베르그 앤드 삼일 주식회사 | Starch solution containing mold flux and the manufacturing method thereof |
| KR20180021167A (en) | 2016-01-05 | 2018-02-28 | 신닛테츠스미킨 카부시키카이샤 | Talline agent, scouring agent and talline method of molten iron |
| KR20210133016A (en) * | 2020-04-28 | 2021-11-05 | 한양대학교 에리카산학협력단 | Dephosphorization method of molten steel using fluorite replaced flux |
| KR102428047B1 (en) * | 2020-04-28 | 2022-08-03 | 한양대학교 에리카산학협력단 | Dephosphorization method of molten steel using fluorite replaced flux |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106591575B (en) | Low energy consumption coal-pressing ball and preparation method thereof | |
| CN101717843B (en) | Method for utilizing sulfur-containing refining waste residue for refining slag | |
| CN1042651C (en) | Manufacture method of vanadic titanium type ultra-high basicity agglomerate | |
| CN101413042B (en) | Slag-forming constituent and preparation thereof | |
| JP2001348610A (en) | Slag formation promoter | |
| CN102586537A (en) | Vanadium extraction coolant and its preparation method | |
| CN101280351A (en) | Production method of vanadium slag | |
| CN102808081A (en) | Steelmaking slag former and preparation method thereof | |
| CN116042963A (en) | Method for preparing refining slag former from casting residues | |
| CN105039637A (en) | Magnesium-bearing cooling agent for extracting vanadium and preparation method of magnesium-bearing cooling agent | |
| US5002733A (en) | Silicon alloys containing calcium and method of making same | |
| CN114686643A (en) | Composite slagging heat-compensating agent for smelting converter with large scrap steel ratio and preparation and use methods thereof | |
| RU2352648C2 (en) | Charge for manufacturing of bricks for metallurgical production | |
| JPH09316512A (en) | Method for melting steel using iron oxide briquette as auxiliary raw material | |
| CN110951929B (en) | Method for reducing iron oxide in steel slag and producing high-activity steel slag | |
| CN102864270A (en) | Vanadium extraction cooling agent and preparation method thereof | |
| CN105039636A (en) | Calcium-bearing cooling agent for extracting vanadium and preparation method of calcium-bearing cooling agent | |
| RU2321647C1 (en) | Iron-containing waste material such as scale briquetting method for melting | |
| CN110042227A (en) | Sinter and preparation method thereof | |
| CN1093564C (en) | Technology for producing rare earth barium silicide alloy by carbon thermal reduction method | |
| JP2001348609A (en) | Foaming restraining agent | |
| JP2001303116A (en) | Desulfurizing agent for molten iron and its using method | |
| RU2201976C2 (en) | Charge for production of briquettes for melting ferroalloys | |
| JPH0583620B2 (en) | ||
| CN108220521A (en) | A kind of desiliconization of hot metal agent and its application method using iron red mud as matrix |
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: 20070807 |