JPH10251055A - Alumina-magnesia-carbon refractory material for heath of electric furnace - Google Patents
Alumina-magnesia-carbon refractory material for heath of electric furnaceInfo
- Publication number
- JPH10251055A JPH10251055A JP9076477A JP7647797A JPH10251055A JP H10251055 A JPH10251055 A JP H10251055A JP 9076477 A JP9076477 A JP 9076477A JP 7647797 A JP7647797 A JP 7647797A JP H10251055 A JPH10251055 A JP H10251055A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- magnesia
- carbon
- weight
- refractory material
- 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.)
- Pending
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
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、製鋼用電気炉の炉床に
使用される耐火物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory used for a hearth of an electric furnace for steelmaking.
【０００２】[0002]
【従来の技術】電気炉炉床にはマグネシア不定形耐火物
が一般的に使用されており、特に損傷の激しい場合はマ
グネシアーカーボン系れんがを使用して耐用の延長を図
っているが、更に耐用の向上が要求されている。2. Description of the Related Art Magnesia amorphous refractories are generally used for electric furnace hearths. Magnesia carbon-based bricks are used to extend the service life especially when damage is severe. There is a demand for improved durability.
【０００３】[0003]
【発明が解決しようとする課題】電気炉炉床に使用され
るれんがの稼動面側は溶鋼の流動による摩耗損傷と吹錬
中の酸素によるカーボンの酸化にさらされており、耐用
向上のためにはこれらに対して抵抗力の強い耐火物が必
要となる。The working surface of a brick used in an electric furnace hearth is subject to wear damage due to the flow of molten steel and oxidation of carbon due to oxygen during blowing. Requires a refractory with a high resistance to these.
【０００４】[0004]
【課題を解決するための手段】本発明は、アルミナ４５
〜９０重量％，マグネシア５〜３０重量％，カーボン５
〜２５重量％の範囲にあり、上記含有マグネシアは少な
くとも５重量％以上がペリクレースとして配合されたア
ルミナ−マグネシア−カーボンおよびアルミナ−スピネ
ル−マグネシア−カーボンれんがを電気炉炉床用れんが
として使用することにより、耐用の向上が図れることを
見いだした。SUMMARY OF THE INVENTION The present invention relates to an alumina 45.
~ 90% by weight, magnesia 5 ~ 30% by weight, carbon 5
The content of magnesia is in the range of ~ 25% by weight, and at least 5% by weight or more of alumina-magnesia-carbon and alumina-spinel-magnesia-carbon bricks blended as periclase are used as electric furnace hearth bricks. And improved durability.
【０００５】[0005]
【作用】本発明は、アルミナ質原料にマグネシア質原料
およびカーボンを添加した耐火物に関するものであり、
予熱昇温および使用中にアルミナ質原料とマグネシア質
原料が反応してスピネルの生成による体積膨張により気
孔が閉塞し、外部より耐火物内部への空気の流入を遮断
し、耐火物中の構成成分であるカーボンの酸化を防止す
る、同時に本耐火物は緻密化し溶鋼の流れによる摩耗を
防止する。The present invention relates to a refractory obtained by adding a magnesia material and carbon to an alumina material,
The alumina-based material and the magnesia-based material react during preheating and use, causing pores to close due to volume expansion due to spinel formation, blocking the flow of air from the outside into the refractory, and the constituents in the refractory. In addition, the refractory is prevented from being oxidized, and at the same time, the refractory is densified to prevent wear due to the flow of molten steel.
【０００６】またカーボン添加は、濡れ性の減少による
スラグの浸入・反応の減少および耐スポーリング性に優
れた特性により損耗を減少することが可能である。[0006] The addition of carbon can reduce slag intrusion and reaction due to a decrease in wettability, and reduce wear due to its excellent spalling resistance.
【０００７】[0007]
【発明の構成】本発明に用いられるアルミナ原料は電融
アルミナ，焼結アルミナ，ボーキサイトおよびその他の
アルミナ８０重量％以上含有するハイアルミナ原料の使
用が可能で、スピネル原料はアルミナ，マグネシアを各
々９０〜２０重量％，１０〜８０重量％含有し、そのア
ルミナとマグネシアの合計が８０重量％以上含有するア
ルミナリッチからマグネシアリッチの電融および焼結ク
リンカーの使用が可能であり、マグネシア原料としてマ
グネシア８０重量％以上含有する電融マグネシアや海水
および天然マグネシアクリンカーの使用が可能である。The alumina raw material used in the present invention can be fused alumina, sintered alumina, bauxite and other high alumina raw materials containing at least 80% by weight of alumina. Alumina-rich to magnesia-rich electrofused and sintered clinker containing up to 20% by weight, 10-80% by weight, and a total of alumina and magnesia of 80% by weight or more can be used. It is possible to use electrofused magnesia, seawater, and natural magnesia clinker containing at least 10% by weight.
【０００８】マグネシア成分のうち、ペリクレース結晶
分の配合量は５〜３０重量％とするのがよく、５重量％
未満では膨張が小さいため気孔の閉塞が不充分であり、
３０重量％より多いと膨張が大きくなりすぎ、組織劣化
を起こし耐摩耗性に劣る。[0008] In the magnesia component, the compounding amount of the periclase crystal is preferably 5 to 30% by weight, and 5% by weight.
If it is less than 10, the pores are not sufficiently closed due to small expansion,
If the content is more than 30% by weight, the swelling becomes too large, the structure is deteriorated, and the wear resistance is poor.
【０００９】カーボン原料としては天然黒鉛，人造黒鉛
のほか、電極屑，コークス，カーボンブラック等の使用
が可能である。As the carbon raw material, in addition to natural graphite and artificial graphite, electrode scrap, coke, carbon black and the like can be used.
【００１０】カーボン原料の配合量は５〜２５重量％と
するのがよく、５重量％以下ではスラグ浸透等により構
造スポーリングによる剥離損傷が大きくなり損耗も大き
くなる。またカーボンが２５重量％以上では構造スポー
リングに対しては良好であるが酸化に対する抵抗性が低
下し損耗が大きくなる。The compounding amount of the carbon raw material is preferably 5 to 25% by weight, and if it is less than 5% by weight, peeling damage due to structural spalling due to slag infiltration and the like becomes large and wear becomes large. If the content of carbon is 25% by weight or more, the structure is good for spalling, but the resistance to oxidation is reduced and the wear is increased.
【００１１】上記の原料を加えた配合に樹脂系結合剤を
添加して混練し、成形後熱処理をして不焼成れんがを得
る。樹脂系結合剤は熱処理によって硬化するものであれ
ば、よく、特に限定するものではないが、フェノール樹
脂などを使用するのが好ましい。[0011] A resin binder is added to the mixture containing the above-mentioned raw materials and kneaded. The resin-based binder is not particularly limited as long as it can be cured by heat treatment, but a phenol resin or the like is preferably used.
【００１２】なお酸化防止策として、アルミニウム粉
末，マグネシウム粉末，シリコン金属粉末またはそれら
の合金粉末より選ばれた１種または２種以上を組み合わ
せた添加量合計が０.５〜１０重量％となるようなもの
も本発明に含まれる。As an antioxidant measure, the total amount of one or a combination of two or more selected from aluminum powder, magnesium powder, silicon metal powder or an alloy powder thereof is 0.5 to 10% by weight. Are included in the present invention.
【００１３】[0013]
【実施例１】表１に示す配合物を混練した坏土をフリク
ションプレスにより成形し、２５０℃で１２時間の熱処
理を行なって不焼成れんがを得た。Example 1 A kneaded clay obtained by kneading the compounds shown in Table 1 was formed by a friction press, and heat-treated at 250 ° C. for 12 hours to obtain an unfired brick.
【００１４】損傷状況の評価は回転浸食試験法で行な
い、表２に示す組成のスラグを用いて１６００℃〜１６
５０℃の温度で１０時間浸食試験を実施し、溶損量を比
較した。The damage condition was evaluated by a rotary erosion test method, using a slag having a composition shown in Table 2 at 1600 ° C. to 16 ° C.
An erosion test was performed at a temperature of 50 ° C. for 10 hours, and the amount of erosion was compared.
【００１５】酸化試験は炭化珪素発熱体電気炉を用い、
大気雰囲気中で１４００℃で３時間加熱した後、炉外に
取り出して冷却、切断後酸化層の厚さを測定比較した。
なお浸食試験結果、酸化試験結果については表１の比較
例１２を１００とした指数によって表示した。The oxidation test uses a silicon carbide heating element electric furnace,
After heating at 1400 ° C. for 3 hours in an air atmosphere, it was taken out of the furnace, cooled, cut, and the thickness of the oxide layer was measured and compared.
The results of the erosion test and the results of the oxidation test are indicated by an index with Comparative Example 12 in Table 1 being 100.
【００１６】[0016]
【発明の効果】本発明品を電気炉炉床れんがとして使用
することにより、従来のマグネシア−カーボンれんがよ
り、約１.４倍の耐食性を示し耐用延長が期待できれん
が原単位の低下が図れる。By using the product of the present invention as an electric furnace hearth brick, the corrosion resistance is about 1.4 times higher than that of the conventional magnesia-carbon brick and the service life can be expected to be extended.
【表１】 [Table 1]
【表２】 [Table 2]
Claims (2)
として、アルミナ４５〜９０重量％，マグネシア５〜３
０重量％，カーボン５〜２５重量％を含有し、上記の含
有マグネシアは少なくとも５重量％以上がペリクレース
の形で配合されており、フェノール樹脂または他の有機
樹脂系バインダーおよびその組み合わせを使用してなる
ことを特徴とする不焼成アルミナ−マグネシア−カーボ
ンおよびアルミナ−スピネル−マグネシア−カーボンれ
んが。1. A refractory used in a hearth of an electric furnace for steelmaking, alumina is 45 to 90% by weight, magnesia 5 to 3%.
0% by weight, 5 to 25% by weight of carbon, and at least 5% by weight or more of the above-mentioned magnesia is blended in the form of periclase, using a phenolic resin or another organic resin-based binder and a combination thereof. Unfired alumina-magnesia-carbon and alumina-spinel-magnesia-carbon bricks, characterized in that:
対して、酸化防止剤としてアルミニウム粉末，マグネシ
ウム粉末，シリコン粉末，またはこれらの合金粉末より
選ばれた１種または２種以上を組み合わせた粉末を合計
で０.５〜１０重量％使用した電気炉炉床用れんが。2. One or two or more selected from aluminum powder, magnesium powder, silicon powder, or an alloy powder thereof are used as an antioxidant with respect to 100% by weight of the refractory material according to claim 1. Electric hearth bricks using a total of 0.5 to 10% by weight of powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9076477A JPH10251055A (en) | 1997-03-12 | 1997-03-12 | Alumina-magnesia-carbon refractory material for heath of electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9076477A JPH10251055A (en) | 1997-03-12 | 1997-03-12 | Alumina-magnesia-carbon refractory material for heath of electric furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10251055A true JPH10251055A (en) | 1998-09-22 |
Family
ID=13606281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9076477A Pending JPH10251055A (en) | 1997-03-12 | 1997-03-12 | Alumina-magnesia-carbon refractory material for heath of electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10251055A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012031026A (en) * | 2010-08-02 | 2012-02-16 | Shinagawa Refractories Co Ltd | Alumina-magnesia-based refractory brick and method for producing the same |
| KR101136855B1 (en) | 2009-11-03 | 2012-04-20 | 조선내화 주식회사 | Composition for closing of tapping hole of electric furnace |
| JP2013253736A (en) * | 2012-06-07 | 2013-12-19 | Shinagawa Refractories Co Ltd | Refractory for ferromanganese manufacturing furnace |
-
1997
- 1997-03-12 JP JP9076477A patent/JPH10251055A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101136855B1 (en) | 2009-11-03 | 2012-04-20 | 조선내화 주식회사 | Composition for closing of tapping hole of electric furnace |
| JP2012031026A (en) * | 2010-08-02 | 2012-02-16 | Shinagawa Refractories Co Ltd | Alumina-magnesia-based refractory brick and method for producing the same |
| JP2013253736A (en) * | 2012-06-07 | 2013-12-19 | Shinagawa Refractories Co Ltd | Refractory for ferromanganese manufacturing furnace |
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