JPH08319152A - Alumina-magnesia-carbon regenerated refractory brick - Google Patents
Alumina-magnesia-carbon regenerated refractory brickInfo
- Publication number
- JPH08319152A JPH08319152A JP7150983A JP15098395A JPH08319152A JP H08319152 A JPH08319152 A JP H08319152A JP 7150983 A JP7150983 A JP 7150983A JP 15098395 A JP15098395 A JP 15098395A JP H08319152 A JPH08319152 A JP H08319152A
- Authority
- JP
- Japan
- Prior art keywords
- brick
- bricks
- mgo
- waste
- refractory
- 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
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明はAl2O3−MgO−C
系耐火レンガに関し、詳しくは使用済みの耐火レンガを
再生利用して成るAl2O3−MgO−C系再生耐火レン
ガに関する。This invention relates to Al 2 O 3 --MgO--C.
More specifically, the present invention relates to Al 2 O 3 —MgO—C-based recycled refractory bricks made by recycling used refractory bricks.
【0002】[0002]
【従来の技術及び発明が解決しようとする課題】製鋼工
場においては電炉,AOD炉,取鍋などの内張耐火材と
してMgO−C系耐火レンガ,MgO系耐火レンガ,M
gO−Cr2O3系耐火レンガ,Al2O3−MgO−C系
耐火レンガなど各種の耐火レンガが使用されている。2. Description of the Related Art In steelmaking factories, MgO-C type refractory bricks, MgO type refractory bricks, M, etc. are used as lining refractory materials for electric furnaces, AOD furnaces, ladles, etc.
gO-Cr 2 O 3 refractory bricks, various refractory bricks such as Al 2 O 3 -MgO-C based refractory bricks are used.
【0003】これらの耐火レンガは一定期間使用した後
に新品の耐火レンガと取り替えられ、その際に多量の使
用済み耐火レンガ(廃レンガ)が発生する。その発生量
は毎年多量(例えば1万トン)に及ぶ。これら発生した
使用済みの廃レンガの多くは、従来、工場の処分場に埋
設処分しているのが実情であるが、その処分場への埋設
処分にも限りがあり、一方でこれを公共投棄場に投棄処
分すれば投棄費用が嵩む問題がある。また公共投棄場に
投棄するにしても、その公共投棄場自体にも限りがある
問題がある。After these refractory bricks are used for a certain period of time, they are replaced with new refractory bricks, and a large amount of used refractory bricks (waste bricks) is generated at that time. The amount generated is large (for example, 10,000 tons) every year. Most of the used waste bricks that have been generated have been disposed of by burying them in the factory's disposal site, but there is a limit to the disposal in the disposal site. There is a problem that the disposal cost will increase if it is disposed of in the field. Moreover, even if dumping into a public dump, there is a problem that the public dump itself is limited.
【0004】そこで製鋼工場から出た廃レンガを再利用
することができればコストの面で、また資源の有効活用
の面で望ましい。とりわけ廃レンガを本来の用途である
耐火レンガとして再生利用することができれば、耐火レ
ンガの価格が高いことからより望ましいものである。Therefore, it is desirable in terms of cost and effective utilization of resources if the waste bricks from the steelmaking plant can be reused. In particular, it is more desirable if the waste bricks can be recycled as the refractory bricks, which is the original purpose, because the price of the refractory bricks is high.
【0005】[0005]
【課題を解決するための手段】本発明は上記耐火レンガ
のうち取鍋から発生する使用済み耐火レンガに着目し、
その有効利用を図ることを目的としてなされたものであ
る。而して本願の発明は、取鍋の内張耐火レンガとして
使用済みのAl2O3−MgO−C系廃レンガにおける稼
動面側の変質層を除去処理した残存部を粉砕し、該廃レ
ンガ粉砕物をAl2O3−MgO−C系新品用レンガ原料
に対して、混合材全体に占める比率が30%以下となる
比率で混合し、成形して成るAl2O3−MgO−C系再
生耐火レンガを要旨とする(請求項1)。The present invention focuses on used refractory bricks generated from a ladle among the refractory bricks,
It was made for the purpose of effective use. Thus, the invention of the present application is to grind the remaining part of the Al 2 O 3 —MgO—C type waste brick used as the lining refractory brick of the ladle to remove the deteriorated layer on the operating surface side, and crush the waste brick. the pulverized product against Al 2 O 3 -MgO-C type new bricks material, the ratio of total mixed material is mixed in a ratio equal to or less than 30%, formed by molding Al 2 O 3 -MgO-C type Reclaimed refractory bricks are the gist (Claim 1).
【0006】本願の別の発明の再生耐火レンガは、請求
項1において、前記使用済みの廃レンガにおける含C%
が原レンガにおけるC%よりも2%以上低くなった部分
を前記変質層として除去し、残りの部分を再生耐火レン
ガ用として利用したことを特徴とする(請求項2)。According to another aspect of the present invention, there is provided a recycled refractory brick in which the C content in the used waste brick is C%.
Is removed by 2% or more lower than C% in the original brick as the altered layer, and the remaining portion is used for recycled refractory bricks (claim 2).
【0007】本願の更に別の発明の再生耐火レンガは、
請求項1又は2において、前記使用済み廃レンガが前記
取鍋のスラグライン以外の部分に用いられたものであ
り、且つ前記再生耐火レンガが該取鍋のスラグライン以
外の部分の内張用のものであることを特徴とする(請求
項3)。The recycled refractory brick of still another invention of the present application is
In Claim 1 or 2, the said used waste brick is what was used for parts other than the slag line of the said ladle, and the said recycled refractory brick is for lining the part other than the slag line of this ladle. It is a thing (Claim 3).
【0008】[0008]
【作用及び発明の効果】上記のように本発明は、取鍋か
ら発生する使用済み耐火レンガを再生利用するものであ
る。この取鍋から発生する使用済み耐火レンガには付着
スラグ等の不純物が付着しており、また湯と接する稼動
面側は熱等によって変質した状態となっている。従って
使用済みの廃レンガはそのままでは耐火材用の原料とし
ては用い得ないものである。As described above, the present invention recycles used refractory bricks generated from a ladle. Impurities such as adhered slag are attached to the used refractory bricks generated from this ladle, and the operating surface side in contact with the hot water is in a state of being deteriorated by heat or the like. Therefore, used waste bricks cannot be used as they are as raw materials for refractory materials.
【0009】しかしながら本発明者が稼動面側の変質層
を除去した残存部分の成分を調べたところ、若干のスラ
グ成分、具体的にはSiO2,Fe2O3,CaO等の成
分の増加は認められるものの、全体としてみれば使用前
の原レンガ、つまり新品レンガの成分と大差のないもの
であり、そこでその残存部分を用いれば、またその使用
量(添加量)を制限するならば、これを再生耐火レンガ
用として活用可能であることが考えられた。However, when the present inventor investigated the components of the remaining portion after the deteriorated layer on the operating surface side was removed, it was found that the amount of some slag components, specifically, SiO 2 , Fe 2 O 3 , CaO, etc., increased. Although it is recognized, as a whole, it is not much different from the composition of the original brick before use, that is, the new brick, and if the remaining part is used there and if the usage amount (addition amount) is limited, this It was thought that it could be utilized for recycled refractory bricks.
【0010】そしてこの着眼の下に使用済み廃レンガの
粉砕物と新品用レンガ原料とを混合及び成形して再生耐
火レンガを作製し、その際に使用済み廃レンガの粉砕物
の混合量を種々変化させて、得られた再生耐火レンガの
特性を調べたところ、使用済み廃レンガの粉砕物の混合
量を30%以下に抑えるならば、実際に耐火レンガとし
て十分使用可能な高品位の耐火レンガの得られることが
判明した。Under this focus, a crushed product of used waste bricks and a raw material for new bricks are mixed and molded to produce a recycled refractory brick, and at this time, the mixed amount of the crushed product of used waste bricks is varied. When the characteristics of the obtained recycled refractory bricks were investigated by changing it, high-grade refractory bricks that could actually be used as refractory bricks were actually used if the mixture amount of crushed waste bricks was reduced to 30% or less. It turned out to be obtained.
【0011】かかる本発明によれば、限りある資源を有
効活用することができるとともに、処分場ないし投棄場
への処分,投棄量を少なくして処分,投棄に要する費用
を節減でき、また加えて高価な耐火レンガに要する費用
を節減することができる。尚、本発明において使用済み
廃レンガ粉砕物のより望ましい添加量の範囲は20%以
下である。According to the present invention, it is possible to effectively use limited resources, and to reduce the cost required for disposal and disposal by reducing the amount of disposal at the disposal site or disposal site and the amount of disposal. The cost required for expensive refractory bricks can be saved. In the present invention, the more preferable range of addition amount of the used waste brick crushed product is 20% or less.
【0012】請求項2の発明は、使用済み廃レンガにお
ける含C%が原レンガよりも2%以上低くなった部分を
変質層として除去し、残りの部分を再生耐火レンガ用と
して利用するもので、本発明によれば、使用済み廃レン
ガ粉砕物の添加によって再生耐火レンガの品位が大きく
低下するのを防止でき、再生耐火レンガの耐食性を高く
維持することができる。According to the second aspect of the present invention, a portion of the used waste brick having a C content lower than that of the original brick by 2% or more is removed as an altered layer, and the remaining portion is used for recycled refractory brick. According to the present invention, it is possible to prevent the quality of recycled fire-resistant bricks from being significantly deteriorated by the addition of the used waste brick crushed product, and it is possible to maintain high corrosion resistance of the recycled fire-resistant bricks.
【0013】上記請求項1,請求項2の再生耐火レンガ
は、取鍋用の耐火レンガとして十分に使用が可能であ
る。取鍋用の耐火レンガの使用条件は非常に過酷であ
り、不純物含量が多いと耐食性が大幅に低下する。しか
るに使用済み廃レンガの使用量を30%以下に抑えた上
記請求項1,請求項2の再生耐火レンガの場合、取鍋用
の耐火レンガとして、より具体的にはスラグライン以外
の部分の内張耐火レンガとして十分に使用が可能であ
る。換言すれば請求項1,請求項2の再生耐火レンガ
は、使用条件が過酷で高品位が求められる取鍋用の耐火
レンガとして用いた場合に効果の高いものである。The recycled refractory bricks of claims 1 and 2 can be sufficiently used as a refractory brick for a ladle. The use conditions of refractory bricks for ladle are very severe, and if the content of impurities is high, the corrosion resistance is significantly reduced. Therefore, in the case of the recycled refractory bricks of claims 1 and 2 in which the amount of used waste bricks is suppressed to 30% or less, as the refractory brick for ladle, more specifically, in the portion other than the slag line It can be fully used as a fireproof brick. In other words, the recycled refractory bricks of claims 1 and 2 are highly effective when used as a refractory brick for a ladle that is used under severe conditions and requires high quality.
【0014】[0014]
【実施例】次に本発明の実施例を以下に詳述する。取鍋
のスラグライン以外の部分から発生した使用済みAl2
O3−MgO−C系耐火レンガ(回収廃レンガ)から稼
動面側に付着したスラグ及び変質層を除去し、残存部分
の化学成分を分析した。その結果を、使用されていない
状態の原レンガのそれと比較して表1に示した。EXAMPLES Examples of the present invention will be described in detail below. Used Al 2 generated from parts other than slag line of ladle
O 3 to remove slag and deteriorated layer adhering to the working surface from -MgO-C refractory bricks (recovered waste bricks), and analyzed chemical composition of the remaining portion. The results are shown in Table 1 in comparison with that of the raw brick in the unused state.
【0015】[0015]
【表1】 [Table 1]
【0016】表1に示しているように回収廃レンガの化
学組成は、原レンガに比べてスラグ成分であるSi
O2,Fe2O3,CaOの若干の増加は認められるもの
の全体として原レンガに近いものである。尚、ここでは
稼動面側の含C%が原レンガに比べて2%以上低くなっ
ている部分を変質層として除去した。但し取鍋用の耐火
レンガとしては含C%が10%のものと8%のもの及び
5%のものの3種が用いられており、上記表1の回収廃
レンガにおけるC量はそれら3種の回収廃レンガをミッ
クスした状態での含C%である。As shown in Table 1, the chemical composition of the recovered waste brick is Si, which is a slag component compared to the original brick.
Although a slight increase in O 2 , Fe 2 O 3 , and CaO is recognized, it is close to that of the original brick as a whole. In addition, here, the portion where the C content on the operating surface side was lower than the original brick by 2% or more was removed as an altered layer. However, as refractory bricks for ladle, three kinds of C% content of 10%, 8% content and 5% content are used, and the amount of C in the recovered waste bricks in the above Table 1 is three kinds. It is the C content in the state where the collected waste bricks are mixed.
【0017】前述したように、回収廃レンガの不純物の
含有量が増加すれば耐食性、つまり耐久寿命は急激に低
下する。そこで回収廃レンガの粉砕物の可能な添加量を
調べるべく、新品用レンガ原料に対する混合比率を種々
変化させて、その耐食性を評価した。結果が図1に示し
てある。ここで耐食性は溶損指数として表してある。As described above, if the content of impurities in the recovered waste bricks increases, the corrosion resistance, that is, the durable life, decreases sharply. Therefore, in order to investigate the possible addition amount of crushed waste bricks, the corrosion resistance was evaluated by changing the mixing ratio with respect to the new brick raw material. The results are shown in Figure 1. Here, the corrosion resistance is represented as a melt loss index.
【0018】図1の結果から、回収廃レンガ粉砕物の添
加量を30%より多くすると急激に耐食性が低下するこ
と、換言すれば添加量を30%以下に抑えるならば耐食
性は良好に維持されることが分かる。またこの図1か
ら、回収廃レンガ粉砕物の添加量としては20%以下が
より望ましいことが分かる。尚、図1において溶損指数
は、原レンガの溶損の程度を100としたときの相対的
な数値で表したものである。From the results shown in FIG. 1, if the amount of the recovered crushed waste bricks added exceeds 30%, the corrosion resistance is sharply reduced. In other words, if the amount added is kept below 30%, good corrosion resistance is maintained. I understand that. Further, it can be seen from FIG. 1 that the amount of the recovered waste brick pulverized material added is preferably 20% or less. In addition, in FIG. 1, the melting loss index is represented by a relative numerical value when the degree of melting loss of the original brick is 100.
【0019】次に、図2は回収廃レンガ粉砕物の混合比
率と残存膨張率との関係を求めてこれを図示したもので
ある。ここで残存膨張率とは、耐火レンガを所定高温度
まで加熱した後冷却し、残留した膨張量(歪量)を百分
率で表したものである。この残存膨張率は次のような意
味を有している。耐火レンガを取鍋の内張りとして用い
たとき、加熱冷却に伴う残存膨張率が小さいと目地との
間にクラックを生じてしまう。従って残存膨張率はある
程度以上あることが望ましい。Next, FIG. 2 illustrates the relationship between the mixing ratio of the recovered waste brick crushed product and the residual expansion ratio and illustrates this. Here, the residual expansion rate is a value in which the refractory brick is heated to a predetermined high temperature and then cooled, and the residual expansion amount (strain amount) is expressed in percentage. This residual expansion coefficient has the following meaning. When a refractory brick is used as a lining for a ladle, if the residual expansion rate due to heating and cooling is small, cracks will occur between the joint and the joint. Therefore, it is desirable that the residual expansion coefficient is above a certain level.
【0020】そこでこれを調べるべく、回収廃レンガ粉
砕物の混合比率と残存膨張率との関係を求めたところ、
混合比率が30%以下であれば残存膨張率はそれほど低
下せず、30%を超えたところから残存膨張率が大きく
低下することが判明した。Then, in order to investigate this, when the relationship between the mixing ratio of the recovered waste brick crushed product and the residual expansion rate was obtained,
It was found that when the mixing ratio was 30% or less, the residual expansion coefficient did not decrease so much, and when the mixing ratio exceeded 30%, the residual expansion coefficient decreased significantly.
【0021】従ってこの残存膨張率の点からも、回収廃
レンガ粉砕物の混合比率としては30%以下が望ましい
ことが分かる。ここで回収廃レンガ粉砕物の混合比率が
増加するにつれて残存膨張率が低下するのは、回収廃レ
ンガ粉砕物が既に熱履歴を受けたものであり、熱による
変化を終了しているためと推定される。Therefore, also from the viewpoint of the residual expansion coefficient, it is understood that the mixing ratio of the recovered waste brick crushed product is preferably 30% or less. It is estimated that the residual expansion rate decreases as the mixing ratio of the collected waste brick crushed product increases because the recovered waste brick crushed product has already undergone thermal history and the change due to heat has ended. To be done.
【0022】以上の結果に基づいて再生耐火レンガの実
炉テストを行ったところ、回収廃レンガ粉砕物の混合比
率を30%以下に抑えたものについては、メタルライ
ン,フリーボード何れの個所に用いた場合にも十分実用
に耐え得ることを確認した。When an actual furnace test of recycled refractory bricks was carried out based on the above results, those with a mixing ratio of recovered waste bricks crushed to 30% or less were used for both metal lines and freeboards. It was confirmed that the device could withstand practical use even when there was a problem.
【0023】以上本発明の実施例を詳述したがこれはあ
くまで一例示であり、本発明はその主旨を逸脱しない範
囲において種々変更を加えた態様で実施可能である。Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be implemented in variously modified modes without departing from the spirit of the invention.
【図1】本発明の実施例において得られた廃レンガ混合
比率と溶損指数との関係を表わした図である。FIG. 1 is a diagram showing a relationship between a waste brick mixing ratio and a melt loss index obtained in an example of the present invention.
【図2】同じく本発明の実施例において得られた廃レン
ガ混入比率と残存膨張率との関係を表わした図である。FIG. 2 is a diagram showing a relationship between a waste brick mixing ratio and a residual expansion ratio, which are also obtained in the example of the present invention.
Claims (3)
Al2O3−MgO−C系廃レンガにおける稼動面側の変
質層を除去処理した残存部を粉砕し、該廃レンガ粉砕物
をAl2O3−MgO−C系新品用レンガ原料に対して、
混合材全体に占める比率が30%以下となる比率で混合
し、成形して成るAl2O3−MgO−C系再生耐火レン
ガ。1. A crushed residual brick of an Al 2 O 3 —MgO—C waste brick used as a lining refractory brick of a ladle, from which a residual layer after removal of an altered layer on the working surface side is pulverized, against al 2 O 3 -MgO-C type new brick material,
An Al 2 O 3 —MgO—C-based recycled refractory brick obtained by mixing and molding the mixture at a ratio of 30% or less in the whole mixed material.
ンガにおける含C%が原レンガにおけるC%よりも2%
以上低くなった部分を前記変質層として除去し、残りの
部分を再生耐火レンガ用として利用したことを特徴とす
るAl2O3−MgO−C系再生耐火レンガ。2. The C content in the used waste brick according to claim 1, which is 2% more than the C% in the original brick.
The Al 2 O 3 —MgO—C-based regenerated refractory brick, wherein the lowered portion is removed as the altered layer and the remaining portion is used for regenerated refractory brick.
廃レンガが前記取鍋のスラグライン以外の部分に用いら
れたものであり、且つ前記再生耐火レンガが該取鍋のス
ラグライン以外の部分の内張用のものであることを特徴
とするAl2O3−MgO−C系再生耐火レンガ。3. The used waste brick according to claim 1 or 2, wherein the used waste brick is used in a portion other than the slag line of the ladle, and the recycled refractory brick is a portion other than the slag line of the ladle. Al 2 O 3 —MgO—C-based regenerated refractory brick, which is used as a lining material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7150983A JPH08319152A (en) | 1995-05-24 | 1995-05-24 | Alumina-magnesia-carbon regenerated refractory brick |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7150983A JPH08319152A (en) | 1995-05-24 | 1995-05-24 | Alumina-magnesia-carbon regenerated refractory brick |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08319152A true JPH08319152A (en) | 1996-12-03 |
Family
ID=15508728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7150983A Pending JPH08319152A (en) | 1995-05-24 | 1995-05-24 | Alumina-magnesia-carbon regenerated refractory brick |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08319152A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20000042062A (en) * | 1998-12-24 | 2000-07-15 | 황석동 | Refractory for a collective cavity of an electric furnace |
CN102617167A (en) * | 2012-03-31 | 2012-08-01 | 通化市五一环保科技股份有限公司 | Regeneration refractory castable taking used unshaped refractories as main materials |
JP2013249245A (en) * | 2012-05-31 | 2013-12-12 | Yotai Refractories Co Ltd | Method for recycling used carbon-containing unfired brick |
CN107673744A (en) * | 2017-10-11 | 2018-02-09 | 马鞍山豹龙新型建材有限公司 | A kind of production method of silicon oxynitride and the composite modified aluminium-magnesia carbon brick of andalusite |
-
1995
- 1995-05-24 JP JP7150983A patent/JPH08319152A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20000042062A (en) * | 1998-12-24 | 2000-07-15 | 황석동 | Refractory for a collective cavity of an electric furnace |
CN102617167A (en) * | 2012-03-31 | 2012-08-01 | 通化市五一环保科技股份有限公司 | Regeneration refractory castable taking used unshaped refractories as main materials |
JP2013249245A (en) * | 2012-05-31 | 2013-12-12 | Yotai Refractories Co Ltd | Method for recycling used carbon-containing unfired brick |
CN107673744A (en) * | 2017-10-11 | 2018-02-09 | 马鞍山豹龙新型建材有限公司 | A kind of production method of silicon oxynitride and the composite modified aluminium-magnesia carbon brick of andalusite |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN100584799C (en) | Low-cost fire-resistant pouring material and method for making same | |
JP4351490B2 (en) | Method for modifying steelmaking slag and modified steelmaking slag | |
JP4077774B2 (en) | Reusing used refractories | |
CN102603324A (en) | Main channel material produced by adopting waste blast furnace main channel materials and machining process thereof | |
JPH08319152A (en) | Alumina-magnesia-carbon regenerated refractory brick | |
JP5347317B2 (en) | How to reuse used tundish refractories | |
JP2003212667A (en) | Process for recycling used refractory | |
JPH08319154A (en) | Magnesia-carbon regenerated refractory brick | |
JP5769170B2 (en) | How to extend the life of converter refractories | |
JP4427370B2 (en) | Method for reforming slag of chromium ore smelting reduction furnace | |
JP4065097B2 (en) | Converter steelmaking | |
JP7131534B2 (en) | Aggregate manufacturing method, coarse aggregate and fine aggregate | |
CN100494119C (en) | Alumina-silicon carbide-carbon refractory material preparation method | |
JP3644330B2 (en) | Treatment method for reducing slag | |
US5772931A (en) | Slag coating process | |
Bennett et al. | Industrial Applications for Spent Refractory Materials | |
JP2013147414A (en) | Method for recycling carbon-containing neutral/acid refractory and method of manufacturing | |
JPH06271352A (en) | Fireproofing material compounded with steelmaking slag aggregate | |
KR100901989B1 (en) | Method of increasing dressing metal from steelmaking slag | |
JP7095674B2 (en) | How to make concrete | |
JP2004307287A (en) | Regenerated carbon-containing brick, and method of manufacturing the same | |
JPH06102561B2 (en) | Hydraulic composite roadbed material | |
CN1978369B (en) | Method for producing mineral admixture for high-strength high-performance concrete | |
JP6538522B2 (en) | Reuse method of tundish refractories for continuous casting | |
TW202405194A (en) | Fine slag made by refractory material and method of making the same |