JP2010150638A - Slag-adjusting agent - Google Patents
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- 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
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Abstract
Description
本発明は、スラグ調整剤に関する。 The present invention relates to a slag adjusting agent.
従来、転炉、取鍋の溶融金属容器の内張耐火物の溶損防止策として、スラグ中のＭｇＯ濃度を調整するために、ＭｇＯを含有するドロマイト、軽焼ドロマイトを投入することが知られている。また、これに代わる添加剤として、転炉解体時に発生するＭｇＯレンガ屑を投入することも知られている。
しかし、このＭｇＯレンガ屑の大きさを３０ｍｍ以上とすると、ＭｇＯレンガ屑が溶解せず、スラグ中のＭｇＯ濃度が上昇しないという問題がある。
Conventionally, in order to adjust the MgO concentration in the slag, it is known to introduce dolomite and light-burned dolomite containing MgO as a measure for preventing the melting of the refractory lining the molten metal container of the converter and ladle. ing. In addition, as an alternative additive, it is also known to throw in MgO brick waste generated during the dismantling of the converter.
However, when the size of the MgO brick waste is 30 mm or more, there is a problem that the MgO brick waste is not dissolved and the MgO concentration in the slag does not increase.
そこで、ＭｇＯレンガ屑を５ｍｍ以下に粉砕し、水等のバインダーを添加、混練してブリケット状に成形したスラグ調整剤が提案されている（例えば、特許文献１参照）。
一方、ディスクペレタイザーで製粒化され、気孔率が高く、かつＭｇＯ含有量の高いスラグ調整剤も提案されており、このスラグ調整剤は、スラグへの溶解速度も優れている（例えば、非特許文献１参照）。
Then, the slag regulator which grind | pulverized MgO brick waste to 5 mm or less, added binders, such as water, knead | mixed, and shape | molded in the briquette form is proposed (for example, refer patent document 1).
On the other hand, a slag adjuster that has been granulated with a disk pelletizer and has a high porosity and a high MgO content has also been proposed, and this slag adjuster has an excellent dissolution rate in slag (for example, non-patented). Reference 1).
しかしながら、前記特許文献１に記載の技術では、ブリケット形状が３０ｍｍ〜６０ｍｍであり、成形時の圧力を高くしてハンドリング時に壊れないようにしているため、スラグ中に投入しても溶解速度がまだ低く、スラグ調整剤を過剰に投入しなければ、スラグ濃度を十分に調整することができないという問題がある。
また、前記非特許文献１に記載の技術では、溶解速度は十分高いが、脆く壊れやすいため、ハンドリングしにくいという問題がある。
However, in the technique described in Patent Document 1, since the briquette shape is 30 mm to 60 mm and the pressure at the time of molding is increased so that it does not break during handling, the dissolution rate is still low even if it is put into the slag. There is a problem that the slag concentration cannot be sufficiently adjusted unless the slag adjusting agent is added excessively.
The technique described in Non-Patent Document 1 has a problem that it is difficult to handle because the dissolution rate is sufficiently high but it is brittle and fragile.
本発明の目的は、スラグ中での溶解速度が高く、かつハンドリング性の良好なスラグ調整剤を提供することにある。 An object of the present invention is to provide a slag adjusting agent having a high dissolution rate in slag and good handleability.
本発明は、以下の構成を要旨とするものである。
（１） 酸化物換算で２０質量％以上、９８質量％以下のＭｇＯを主成分とし、残部がＣａＯ、ＳｉＯ２、カルシウム炭酸化物、及びカルシウム水酸化物の少なくともいずれか一種以上、並びに不可避的不純物からなる原料に、
外掛けで０．１質量％以上、２．０質量％以下の発泡剤、及び、外掛けで０．０１質量％以上、０．２質量％以下の有機繊維の少なくともいずれか一方を添加し、
さらにバインダーを加えて混練、成形、及び乾燥してなることを特徴とするスラグ調整剤。
The gist of the present invention is as follows.
(1) 20% by mass or more and 98% by mass or less of MgO as a main component in terms of oxide, with the balance being at least one of CaO, SiO 2 , calcium carbonate, and calcium hydroxide, and inevitable impurities The raw material consisting of
At least one of 0.1% by mass or more and 2.0% by mass or less of a foaming agent by outer coating, and 0.01% by mass or more and 0.2% by mass or less of organic fiber by outer coating,
Further, a slag adjusting agent obtained by kneading, molding and drying by adding a binder.
（２） （１）のスラグ調整剤において、
前記原料は、軽焼マグネシア、生ドロマイト、軽焼ドロマイト、蛇紋岩、カンラン岩、水滑石、焼成ブルーサイト、重焼マグネシア、及び使用済みＭｇＯ含有レンガの少なくともいずれか一種以上を出発原料として得られることを特徴とするスラグ調整剤。
（３） （１）又は（２）のスラグ調整剤において、
前記バインダーは、水及び水溶性高分子材料を水に溶解した溶液、のいずれか一方であることを特徴とするスラグ調整剤。
（４） （１）乃至（３）のいずれかに記載のスラグ調整剤において、
球体換算で直径２０ｍｍ以上、５０ｍｍ以下の大きさを有することを特徴とするスラグ調整剤。
(2) In the slag adjusting agent of (1),
The raw material is obtained from at least one of light-burned magnesia, raw dolomite, light-burned dolomite, serpentinite, peridotite, water talc, fired brucite, heavy fired magnesia, and used MgO-containing brick as a starting material. A slag adjusting agent characterized by that.
(3) In the slag adjusting agent of (1) or (2),
The slag adjusting agent, wherein the binder is one of water and a solution obtained by dissolving a water-soluble polymer material in water.
(4) In the slag adjusting agent according to any one of (1) to (3),
A slag adjusting agent having a diameter of 20 mm or more and 50 mm or less in terms of a sphere.
本発明によれば、スラグ調整剤が、外掛けで０．１質量％以上、２．０質量％以下の発泡剤、及び、外掛けで０．０１質量％以上、０．２質量％以下の有機繊維の少なくともいずれか一方を含んで構成されることにより、高い圧力で成形して高強度のハンドリング性の良好なスラグ調整剤とすることが可能であり、かつスラグ投入時には発泡剤が発泡したり、有機繊維が溶けてスラグ調整剤の内部の気孔率が増加して、溶解速度の高いスラグ調整剤とすることができる。 According to the present invention, the slag adjusting agent is 0.1% by mass or more and 2.0% by mass or less of the foaming agent by the outer coating, and 0.01% by mass or more and 0.2% by mass or less by the outer coating. By comprising at least one of organic fibers, it is possible to form a slag conditioner with high strength and good handling properties by molding at high pressure, and the foaming agent foams when slag is added. Alternatively, the organic fiber melts and the porosity of the slag adjusting agent increases, so that the slag adjusting agent having a high dissolution rate can be obtained.
本発明のスラグ調整剤の混練、成形方法は、特に限定されるものではなく、前記原料に発泡剤、有機繊維を添加したものに、水を添加してミキサーで混練し、押出成型機で柱状に成形切断したり、ディスクペレタイザーやドラムミキサーで混練及び成形を同時に行って造粒したり、高圧ブリケッティング造粒方法により造粒してもよい。
また、乾燥方法も特に限定されるものではなく、ホットバス、自然乾燥等適宜選択することができる。
The method for kneading and molding the slag adjusting agent of the present invention is not particularly limited, and water is added to the above raw material added with a foaming agent and organic fiber, and the mixture is kneaded with a mixer, and columnar with an extruder. Or may be granulated by simultaneous kneading and molding with a disk pelletizer or drum mixer, or granulated by a high-pressure briquetting granulation method.
Also, the drying method is not particularly limited, and can be appropriately selected such as a hot bath or natural drying.
本発明のスラグ調整剤に使用する発泡剤としては、有機系発泡剤としては、アゾジカルボンアミド、Ｎ，Ｎ’−ジニトロソペンタメチレンテトラミン、ｐ−トルエンスルホニルヒドラジッド、４、４’−オキシビスベンゼンスルホニルヒドラジッド等がある。一方、無機系発泡剤としては、炭酸カルシウム、リン酸、重曹、炭酸アンモニウム、亜硝酸ソーダ等がある。
これらの発泡剤のうち、例えば、アゾジカルボンアミドは、ゴム、プラスチックに配合してスポンジ製品を製造するための発泡剤である。これらの発泡剤は、加熱されると発泡剤が分解し、炭酸ガス、窒素ガス、アンモニア等を発生し、スラグ調整剤の内部に気泡構造を形成させる作用がある。
前記発泡剤の添加量を０．１質量％以上、２．０質量％以下としたのは、０．１質量％未満では、発泡による気泡構造の形成が少なく、溶解速度向上に寄与しなくなるからであり、２．０質量％を超えると、成形体の強度が確保できず、ハンドリング性が低下するからである。
As the foaming agent used in the slag adjusting agent of the present invention, as the organic foaming agent, azodicarbonamide, N, N′-dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazide, 4,4′-oxybis Benzenesulfonyl hydrazide. On the other hand, examples of the inorganic foaming agent include calcium carbonate, phosphoric acid, sodium bicarbonate, ammonium carbonate, and sodium nitrite.
Among these foaming agents, for example, azodicarbonamide is a foaming agent for producing sponge products by blending with rubber and plastic. When these foaming agents are heated, the foaming agents are decomposed to generate carbon dioxide, nitrogen gas, ammonia, and the like, thereby forming an air bubble structure inside the slag adjusting agent.
The reason why the amount of the foaming agent added is 0.1% by mass or more and 2.0% by mass or less is that when the amount is less than 0.1% by mass, the formation of a cell structure due to foaming is small, and the dissolution rate is not improved. If the amount exceeds 2.0% by mass, the strength of the molded body cannot be ensured, and the handling property is deteriorated.
本発明のスラグ調整剤に使用する有機繊維としては、ビニロンファイバー、ポリプロピレンファイバー、塩化ビニルファイバー等の有機繊維の他、ポリエステル、ポリアミド、アクリル、セルロース、ナイロン、ポリビニル、ポリエチレン、ポリビニルアルコール等の材質の繊維がある。
これらの有機繊維がスラグ調整剤に含有されていると、スラグ調整剤をスラグ中に投入すると、加熱により有機繊維が液体となってスラグ調整剤から流れ出して空隙化し、スラグ調整剤の比表面積が大きくなってスラグ調整剤の溶解速度が向上する。
前記有機繊維の添加量を０．０１質量％以上、０．２質量％以下としたのは、０．０１質量％未満では、気孔を十分に形成できず溶解速度が向上しないからであり、０．２質量％を超えると、成形が困難となり、強度も低下するからである。
前記有機繊維の長さは、０．５ｍｍ以上、２０ｍｍ以下とするのが好ましい。０．５ｍｍ未満では、気候を形成する繊維としての効果が得られ難く、２０ｍｍを超えると強度が著しく低下する上、成形しにくくなる。
Organic fibers used in the slag adjusting agent of the present invention include organic fibers such as vinylon fiber, polypropylene fiber, and vinyl chloride fiber, as well as materials such as polyester, polyamide, acrylic, cellulose, nylon, polyvinyl, polyethylene, and polyvinyl alcohol. There are fibers.
When these organic fibers are contained in the slag adjusting agent, when the slag adjusting agent is put into the slag, the organic fiber becomes a liquid by heating and flows out of the slag adjusting agent to form voids, and the specific surface area of the slag adjusting agent is increased. It becomes larger and the dissolution rate of the slag adjusting agent is improved.
The reason why the amount of the organic fiber added is 0.01% by mass or more and 0.2% by mass or less is that when the amount is less than 0.01% by mass, pores cannot be sufficiently formed and the dissolution rate is not improved. This is because if it exceeds 2% by mass, molding becomes difficult and the strength also decreases.
The length of the organic fiber is preferably 0.5 mm or more and 20 mm or less. If it is less than 0.5 mm, it is difficult to obtain the effect as a fiber forming the climate, and if it exceeds 20 mm, the strength is remarkably lowered and molding becomes difficult.
本発明では、前記原料は、軽焼マグネシア、生ドロマイト、軽焼ドロマイト、蛇紋岩、カンラン岩、焼成ブルーサイト、重焼マグネシア、及び使用済みＭｇＯ含有レンガの少なくともいずれか一種以上を出発原料として得られるのが好ましい。
これらの出発原料をジョークラッシャ、インパクトクラッシャ等の粉砕機で粉砕し、粒径を５ｍｍ以下として、さらに場合によっては焼成したものを、スラグ調整剤の原料とすることができる。
In the present invention, the raw material is obtained from at least one of light-burned magnesia, raw dolomite, light-burned dolomite, serpentinite, peridotite, fired brucite, heavy fired magnesia, and used MgO-containing brick as a starting material. It is preferred that
These starting materials are pulverized by a pulverizer such as a jaw crusher or impact crusher, and the particle size is set to 5 mm or less.
本発明では、スラグ調整剤に使用するバインダーとしては、水及び水溶性高分子を水に溶解した溶液、のいずれか一方が好ましい。
水溶性高分子としては、例えば、メチルセルロース、カルボキシメチルセルロース、ポリビニルアルコール等がある。
このようなバインダーを用いることにより、粉状体からなる原料の成形性が向上する。
In this invention, as a binder used for a slag regulator, either one of water and the solution which melt | dissolved water-soluble polymer in water is preferable.
Examples of the water-soluble polymer include methyl cellulose, carboxymethyl cellulose, and polyvinyl alcohol.
By using such a binder, the moldability of the raw material consisting of a powdery body is improved.
本発明では、スラグ調整剤の大きさは、球体換算で直径２０ｍｍ以上、５０ｍｍ以下とするのが好ましい。
スラグ調整剤の形状は球状体である必要はなく、例えば、円柱状体、直方体、その他の多面体形状に成形してもよい。
球体換算で直径２０ｍｍ未満とするとハンドリング性が低下する。一方、直径５０ｍｍを超えるとスラグ中での溶解速度が低下する。
In the present invention, the size of the slag adjusting agent is preferably 20 mm or more and 50 mm or less in terms of a sphere.
The shape of the slag adjusting agent does not need to be a spherical body, and may be formed into, for example, a cylindrical body, a rectangular parallelepiped, or other polyhedral shapes.
When the diameter is less than 20 mm in terms of a sphere, handling properties are reduced. On the other hand, when the diameter exceeds 50 mm, the dissolution rate in the slag decreases.
本発明のスラグ調整剤は、次の用途に適用することができる。
（１） 製鋼用転炉で吹練前に生石灰、石灰石等と同時に投入する場合
従来、製鋼用転炉におけるスラグに投入するＭｇＯ源としては、生ドロマイト、軽焼ドロマイト、マグネサイト等のＭｇＯを含む鉱石の他、近年、マグネサイトの微粉を３０ｍｍ程度に造粒したマグネシアボールが世界的に使用されるようになってきたが、スラグ中での溶解速度が低く、スラグ中のＭｇＯ濃度を早期に上げることができなかった。
本発明のスラグ調整剤では、マグネサイトと同時に発泡剤、有機繊維を添加しているため、溶融スラグ中でスラグ調整剤の反応表面積が増大し、短時間で溶解反応が進行する。これにより、従来より短時間でスラグ中のＭｇＯ濃度を上昇させることができ、所定のＭｇＯ濃度に到達させることができるので、スラグ中へのスラグ調整剤の添加量を少なくすることができる。この結果、耐火物の溶損を防止でき、製鋼用転炉の寿命延長化を図ることができる。
The slag adjusting agent of the present invention can be applied to the following uses.
(1) When charging simultaneously with quicklime, limestone, etc. before blowing in a steelmaking converter Conventionally, MgO such as raw dolomite, light-burned dolomite, and magnesite is used as the MgO source to be input to the slag in the steelmaking converter. In recent years, magnesia balls that have been granulated to about 30 mm of magnesite fine powder have been used worldwide in addition to ores containing them. However, the dissolution rate in slag is low, and the MgO concentration in slag is increased early. Could not be raised.
In the slag adjusting agent of the present invention, since the foaming agent and the organic fiber are added simultaneously with magnesite, the reaction surface area of the slag adjusting agent increases in the molten slag, and the dissolution reaction proceeds in a short time. Thereby, since MgO density | concentration in slag can be raised in a shorter time than before, and it can be made to reach predetermined MgO density | concentration, the addition amount of the slag regulator to slag can be decreased. As a result, the refractory can be prevented from being melted, and the life of the steelmaking converter can be extended.
（２） 出鋼後、スラグコーティング前にスラグ改質剤として投入する場合
従来、スラグコーティング（スラグスラッシュコーティング、首振りコーティング等）前に投入するスラグ改質剤としては、石灰石や生ドロマイトを投入していた。
石灰石は、安価でスラグを冷却する能力があり、スラグを固化させて炉壁コーティングをさせることで炉体を保護することができるという効果がある。しかし、石灰石は、ＭｇＯを含んでいないので、スラグ中のＭｇＯ濃度を高くすることはできない。
生ドロマイトは、スラグを冷却する能力に加え、スラグ中のＭｇＯ濃度を高くすることができる。また、マグネサイトやブルーサイトを造粒したマグネシアボールはＭｇＯの濃度が高く、スラグ冷却能も有するが、ハンドリング性を考慮した高強度品は、径が生ドロマイトや石灰石に比較して大きく、溶融スラグ中での溶解速度に劣る。
本発明のスラグ調整剤は、従来のマグネシアボールと比較して、発泡剤等を含んでいるために崩壊、溶解し易く、これによりスラグへの未溶解のＭｇＯ量を減らすことができるため、ＭｇＯの濃度が高く、スラグ冷却能も有し、スラグ中での溶解速度も高いので、従来よりも最適なスラグ性状に短時間で到達させることができ、従来よりも少量の添加で所定のＭｇＯ濃度に到達させることができる。この結果、スラグコーティング性が向上し、製鋼用転炉の寿命延長化を図ることができる。
(2) In case of adding as slag modifier after steelmaking and before slag coating Conventionally, limestone and raw dolomite are used as slag modifiers before slag coating (slag slash coating, swing coating, etc.) Was.
Limestone is inexpensive and has the ability to cool the slag, and has the effect that the furnace body can be protected by solidifying the slag and coating the furnace wall. However, since limestone does not contain MgO, the MgO concentration in the slag cannot be increased.
Raw dolomite can increase the MgO concentration in the slag in addition to the ability to cool the slag. Also, magnesia balls granulated from magnesite and brucite have high MgO concentration and slag cooling ability, but high-strength products that are easy to handle are larger in diameter than raw dolomite and limestone and melt. Poor dissolution rate in slag.
Compared with the conventional magnesia ball, the slag adjusting agent of the present invention is easy to disintegrate and dissolve because it contains a foaming agent and the like, thereby reducing the amount of undissolved MgO in the slag. High concentration of slag, ability to cool slag, and high dissolution rate in slag, so it is possible to reach the optimal slag properties in a short time compared to the conventional method. Can be reached. As a result, the slag coating properties are improved, and the life of the steelmaking converter can be extended.
以下、本発明の実施例を説明する。尚、本発明は、以下の実施例に限定されるものではない。
（１） ［実施例１］〜［実施例４］
酸化物換算でＭｇＯが６０質量％〜９０質量％含まれる原料に、外掛けで０．０１質量％〜２質量％の有機繊維（（株）ユニチカプロテック坂越 タイプＳＭＲ）と、外掛けで１２質量％のカルボキシメチルセルロース（ＣＭＣ）とを加え、ディスクペレタイザーにより造粒を行った後、乾燥させてスラグ調整剤を得た。
（２） ［実施例５］〜［実施例８］
酸化物換算でＭｇＯが６０質量％〜９０質量％含まれる原料に、外掛けで０．５質量％〜２質量％の発泡剤（三協化成（株） セルマイクＡ）と、外掛けで１２質量％のＣＭＣとを加え、ディスクペレターザーにより造粒を行った後、乾燥させてスラグ調整剤を得た。
Examples of the present invention will be described below. The present invention is not limited to the following examples.
(1) [Example 1] to [Example 4]
In a raw material containing 60% to 90% by mass of MgO in terms of oxides, 0.01% to 2% by mass of organic fiber (Unitika Protech Sakagoe Type SMR Co., Ltd.) and 12 Mass% carboxymethylcellulose (CMC) was added, granulated with a disk pelletizer, and dried to obtain a slag adjuster.
(2) [Example 5] to [Example 8]
A raw material containing 60% to 90% by mass of MgO in terms of oxide, 0.5% to 2% by mass of foaming agent (Sankyo Kasei Co., Ltd. Cellmic A), and 12% of outer coating. % CMC and granulated with a disk pelletizer, and then dried to obtain a slag adjusting agent.
（３） ［実施例９］〜［実施例１２］
酸化物換算でＭｇＯが６０質量％〜９０質量％含まれる原料に、実施例１と同様の有機繊維を外掛けで０．０１質量％〜２質量％、実施例１と同様の発泡剤を外掛けで０．５質量％〜２質量％、及びＣＭＣを外掛けで１２質量％加え、ディスクペレタイザーにより造粒を行った後、乾燥させてスラグ調整剤を得た。
（４） ［比較例１］、［比較例２］
酸化物換算でＭｇＯが６０質量％〜９０質量％含まれる原料に、ＣＭＣを外掛けで１２質量％加え、ディスクペレタイザーにより造粒を行った後、乾燥させてスラグ調整剤を得た。
実施例１〜実施例１２、比較例１及び比較例２の組成を表１に示す。
(3) [Example 9] to [Example 12]
A raw material containing 60% by mass to 90% by mass of MgO in terms of oxide is coated with the same organic fiber as in Example 1, 0.01% by mass to 2% by mass, and the same foaming agent as in Example 1 is removed. 0.5% by mass to 2% by mass by hanging and 12% by mass of CMC by outer coating were added, granulated by a disk pelletizer, and dried to obtain a slag adjusting agent.
(4) [Comparative Example 1], [Comparative Example 2]
12% by mass of CMC was added to the raw material containing 60% by mass to 90% by mass of MgO in terms of oxide, granulated with a disk pelletizer, and then dried to obtain a slag adjusting agent.
Table 1 shows the compositions of Examples 1 to 12, Comparative Example 1 and Comparative Example 2.
（５） 評価方法
実施例１〜実施例１２、比較例１及び比較例２で得られたスラグ調整剤を、円筒状に切り出し、高周波誘導路でルツボ注に溶解させたスラグに一定時間浸漬させ、円筒状試料の質量変化を測定して、溶解速度を求めた。
また、見掛け気孔率は、常温、１０００℃、１５００℃の雰囲気にスラグ調整剤を一定時間曝露した後、それぞれの気孔率を測定した。
実施例１〜実施例１２、比較例１及び比較例２の溶解速度、見掛け気孔率の結果を表１に示す。
(5) Evaluation method The slag adjusting agent obtained in Examples 1 to 12, Comparative Example 1 and Comparative Example 2 was cut out into a cylindrical shape and immersed in a slag dissolved in a crucible pouring through a high-frequency induction path for a certain period of time. The change in mass of the cylindrical sample was measured to determine the dissolution rate.
The apparent porosity was measured by exposing each slag adjuster to an atmosphere at room temperature, 1000 ° C., and 1500 ° C. for a certain period of time, and then measuring each porosity.
Table 1 shows the dissolution rate and apparent porosity results of Examples 1 to 12, Comparative Example 1 and Comparative Example 2.
（６）評価結果
表１からわかるように、有機繊維及び発泡剤の少なくともいずれかを添加した実施例１〜実施例１２は、常温における見掛け気孔率は、比較例１及び比較例２とあまり差がなく、従来のものと同様に取り扱うことのできるハンドリング性を有することが確認された。一方、実施例１〜実施例１２は、１０００℃以上での見掛け気孔率が、同じＭｇＯ含有量の組成のスラグ調整剤で比較すると、比較例１及び比較例２よりも大きくなっており、１０００℃以上における表面積が大きくなり、スラグ中に浸漬し易い状態となっていることが確認された。
さらに、溶解速度も従来の比較例１及び比較例２よりも大きくなっており、スラグ中にあっては、短時間で溶解することが確認された。
特に、有機繊維及び発泡剤を添加した実施例９〜実施例１２では見掛け気孔率、溶解速度が比較例１及び比較例２よりも大幅に大きくなっており、スラグ中で非常に溶けやすくなっていることがわかる。
以上のことから、本発明のスラグ調整剤によれば、常温ではハンドリング性が良好であり、スラグ中に投入するとスラグ中での溶解速度が従来のものよりも高く、短時間で溶解することが確認された。
(6) Evaluation results As can be seen from Table 1, in Examples 1 to 12 to which at least one of organic fibers and a foaming agent was added, the apparent porosity at room temperature was much different from that in Comparative Examples 1 and 2. It was confirmed that it has a handling property that can be handled in the same way as the conventional one. On the other hand, in Examples 1 to 12, the apparent porosity at 1000 ° C. or higher is larger than that of Comparative Example 1 and Comparative Example 2 when compared with the slag adjusting agent having the same MgO content. It was confirmed that the surface area at a temperature of 0 ° C. or higher was increased, and it was easy to be immersed in the slag.
Furthermore, the dissolution rate was larger than that of the conventional Comparative Example 1 and Comparative Example 2, and it was confirmed that the slag was dissolved in a short time.
In particular, in Examples 9 to 12 to which organic fibers and a foaming agent were added, the apparent porosity and dissolution rate were significantly larger than those of Comparative Examples 1 and 2, and it was very easy to dissolve in slag. I understand that.
From the above, according to the slag adjusting agent of the present invention, the handleability is good at room temperature, and when it is put into the slag, the dissolution rate in the slag is higher than the conventional one, and it can be dissolved in a short time. confirmed.
Claims (4)
外掛けで０．１質量％以上、２．０質量％以下の発泡剤、及び、外掛けで０．０１質量％以上、０．２質量％以下の有機繊維の少なくともいずれか一方を添加し、
さらにバインダーを加えて混練、成形、及び乾燥してなることを特徴とするスラグ調整剤。 A raw material mainly composed of 20% by mass or more and 98% by mass or less of MgO in terms of oxide, with the balance being at least one of CaO, SiO 2 , calcium carbonate and calcium hydroxide, and inevitable impurities In addition,
At least one of 0.1% by mass or more and 2.0% by mass or less of a foaming agent by outer coating, and 0.01% by mass or more and 0.2% by mass or less of organic fiber by outer coating,
Further, a slag adjusting agent obtained by kneading, molding and drying by adding a binder.
前記原料は、軽焼マグネシア、生ドロマイト、軽焼ドロマイト、蛇紋岩、カンラン岩、水滑石、焼成ブルーサイト、重焼マグネシア、及び使用済みＭｇＯ含有レンガの少なくともいずれか一種以上を出発原料として得られることを特徴とするスラグ調整剤。 In the slag adjusting agent according to claim 1,
The raw material is obtained from at least one of light-burned magnesia, raw dolomite, light-burned dolomite, serpentinite, peridotite, water talc, fired brucite, heavy fired magnesia, and used MgO-containing brick as a starting material. A slag adjusting agent characterized by that.
前記バインダーは、水及び水溶性高分子材料を水に溶解した溶液、のいずれか一方であることを特徴とするスラグ調整剤。 In the slag adjusting agent according to claim 1 or 2,
The slag adjusting agent, wherein the binder is one of water and a solution obtained by dissolving a water-soluble polymer material in water.
球体換算で直径２０ｍｍ以上、５０ｍｍ以下の大きさを有することを特徴とするスラグ調整剤。 In the slag adjusting agent according to any one of claims 1 to 3,
A slag adjusting agent having a diameter of 20 mm or more and 50 mm or less in terms of a sphere.
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| JP2012158495A (en) * | 2011-02-01 | 2012-08-23 | Nippon Material Kk | Furnace wall protection material for steelmaking and method for manufacturing the same |
| CN113913583A (en) * | 2021-10-15 | 2022-01-11 | 张家港荣盛特钢有限公司 | Slag modification and slag splashing furnace protection method |
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