JPH046150A - Magnesia-chrome refractories - Google Patents
Magnesia-chrome refractoriesInfo
- Publication number
- JPH046150A JPH046150A JP2105765A JP10576590A JPH046150A JP H046150 A JPH046150 A JP H046150A JP 2105765 A JP2105765 A JP 2105765A JP 10576590 A JP10576590 A JP 10576590A JP H046150 A JPH046150 A JP H046150A
- Authority
- JP
- Japan
- Prior art keywords
- magnesia
- refractories
- alumina
- aggregate
- chrome
- 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
- 239000011819 refractory material Substances 0.000 title abstract description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 claims description 17
- 239000011651 chromium Substances 0.000 claims description 17
- 239000002994 raw material Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 18
- 238000004901 spalling Methods 0.000 abstract description 10
- 239000000395 magnesium oxide Substances 0.000 abstract description 9
- 238000010304 firing Methods 0.000 abstract description 4
- 229910052596 spinel Inorganic materials 0.000 abstract description 2
- 239000011029 spinel Substances 0.000 abstract description 2
- 239000007858 starting material Substances 0.000 abstract 3
- 238000005336 cracking Methods 0.000 abstract 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は耐火物に関し、特にマグネシア−クロム質耐火
物に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to refractories, and particularly to magnesia-chromium refractories.
マグネシア−クロム質耐火物は耐火度が高いのみならず
、塩基性スラグに対する耐食性に優れるという特長を有
し、従来から電気炉、・ＲＨｆｉガス炉等で使用されて
いる。また、セメントロータリーキルン用耐火物として
も広く使用されている。Magnesia-chromium refractories not only have high refractory properties but also have excellent corrosion resistance against basic slag, and have been used in electric furnaces, RHfi gas furnaces, and the like. It is also widely used as a refractory for cement rotary kilns.
マグネシア−クロム質耐火物の中で、マグネシアとクロ
ム鉱を予備反応させた、いわゆる電融マグネシアクロム
タリンカーや焼結マグネシアクロムタリンカーなどの原
料を使用し、ダイレクトボンドの発達したマグネシアク
ロムリボンドれんがは熱間強度が大きく緻密なれんが組
織を有するので、更に優れた成績を示すが、耐スポーリ
ング性に劣るため用途が制限されている。Among magnesia-chromium refractories, magnesia chrome ribbons are developed using raw materials such as so-called electrofused magnesia chrome tarinkar and sintered magnesia chromium talinker, which are made by pre-reacting magnesia and chromite, and have developed direct bonds. Bricks have a high hot strength and a dense brick structure, so they show even better results, but their use is limited because they have poor spalling resistance.
更に近年は、鋼の高級化志向が強く、・また、酸素ラン
スなどを設備した苛酷な条件下にあり、これに対応する
内張り材は更に耐用性の高いものが望まれている。Furthermore, in recent years, there has been a strong trend toward higher quality steel, and the harsh conditions of equipment such as oxygen lances have created a demand for lining materials with even higher durability.
一般に、耐火物の熱衝撃等による亀裂の発生を完全に防
止することは不可能であるが、耐火物の耐用性は亀裂が
発生するか否かより、発生した亀裂が更に発達して耐火
物を貫通し、割れにまで至るか否かに左右されると考え
られる。従って、亀裂を小さく分散させることができれ
ば、耐火物はかえって割れ難くなり、実質的に耐スポー
リング性は向上することとなる。Generally, it is impossible to completely prevent the occurrence of cracks in refractories due to thermal shock, etc., but the durability of refractories is determined by whether cracks occur or not. It is thought that it depends on whether or not the material penetrates through the surface and even cracks. Therefore, if the cracks can be made small and dispersed, the refractory will be less likely to crack, and the spalling resistance will be substantially improved.
この発明は上記の事情に鑑みて提案されたものであって
、耐スポーリング性に優れたマグネシアクロム質耐火物
を提供することを目的とする。This invention has been proposed in view of the above circumstances, and an object thereof is to provide a magnesia chromium refractory having excellent spalling resistance.
本発明は上記の目的を達成するために以下の手段を採用
している。すなわち、マグネシア−クロム質からなる骨
材に対し、粒径５１１以下のアルミナ系原料を外掛けで
０．５〜１０重景％重量したマグネシア−クロム質耐火
物である。The present invention employs the following means to achieve the above object. That is, it is a magnesia-chromium refractory made by adding 0.5 to 10 percent by weight of alumina-based raw material having a particle size of 511 or less to aggregate made of magnesia-chromium.
本発明はマグネシア−クロム質からなる骨材に対し、ア
ルミナ系原料を外掛け０．５〜１０重量％添加すること
により、マグネシア−クロム質耐火物の組織中でマイク
ロクラックを発生させ、耐スポーリング性を向上させて
いる。すなわち、焼成時にアルミナ系原料が骨材中のマ
グネシアと反応して、スピネル化するに伴い、体積膨張
を起こして、該耐火物のＭｉ繊織中マイクロクランクを
発生させる。このように予め耐火物中に導入したマイク
ロクラックが使用中に耐火物中に発生する亀裂の進展を
防止、あるいは、抑制することにより、耐スポーリング
性を向上させている。In the present invention, microcracks are generated in the structure of magnesia-chromium refractories by adding 0.5 to 10% by weight of alumina-based raw materials to aggregates made of magnesia-chromium. Improves polling performance. That is, during firing, the alumina-based raw material reacts with magnesia in the aggregate and turns into spinel, causing volumetric expansion and generating microcranks in the Mi fibers of the refractory. In this way, the microcracks introduced into the refractory in advance prevent or suppress the growth of cracks that occur in the refractory during use, thereby improving the spalling resistance.
アルミナ系原料の添加量が、上記骨材に対し、外掛けで
０．５重量％未満ではマイクロクラックの発生が充分で
はなく、上記目的を達成できない。If the amount of the alumina-based raw material added is less than 0.5% by weight based on the aggregate, the generation of microcracks will not be sufficient and the above objective will not be achieved.
同じく１０重量％を超える添加量では焼成時に発生する
マイクロクランクが大きくなりすぎて強度低下を招くと
ともに、耐スポーリング性向上の効果が低減されるので
好ましくない。Similarly, if the amount added exceeds 10% by weight, microcranks generated during firing become too large, leading to a decrease in strength, and the effect of improving spalling resistance is reduced, which is not preferable.
本発明に使用するアルミナ系原料の粒径は、通常０．１
〜５．Ｏ＋ｎ程度であるが、より好ましくは０．３５〜
ｌ、Ｑｍｍとすることで耐火物内での好適なマイクロク
ラックの発生を得ることができる。粒径が５ ｍ＋＋を
超えたアルミナ系原料では、得られる耐火物内の組織の
多孔質化が過度に進行して耐火性が低下する。The particle size of the alumina raw material used in the present invention is usually 0.1
~5. It is about O+n, but more preferably 0.35 to
1, Qmm, it is possible to obtain suitable generation of microcracks within the refractory. If the alumina-based raw material has a particle size exceeding 5 m++, the structure within the obtained refractory will become porous to an excessive extent, resulting in a decrease in fire resistance.
以下、本発明に関し、実施例をもとに更に、詳細に説明
する。Hereinafter, the present invention will be described in more detail based on examples.
焼結マグネシアクリンカ−（粒径５龍以下）と天然クロ
ム鉱（粒径５１以下）および酸化クロム（微粉）とを配
合した骨材に、粒径０．３５〜１゜０鶴のアルミナ系原
料を、第１表の実施例１〜３に示す割合で添加した後、
７６０ｋｇｆ／ｃｎｌの圧力で成形し、更に、この成形
体を１８００℃以上で焼成して得られたマグネシア−ク
ロム質耐火物の物性値を第１表に示す。また、比較例１
として、アルミナ系原料を添加していない従来のマグネ
シア−クロム質耐火物を上記実施例１〜３と同様の工程
で製造し、その物性値も併せて示す。An alumina-based raw material with a particle size of 0.35 to 1°0 is added to aggregate that is a mixture of sintered magnesia clinker (particle size 5 or less), natural chromite (particle size 51 or less), and chromium oxide (fine powder). were added in the proportions shown in Examples 1 to 3 in Table 1,
Table 1 shows the physical properties of the magnesia-chromium refractory obtained by molding at a pressure of 760 kgf/cnl and firing this molded body at 1800° C. or higher. Also, Comparative Example 1
A conventional magnesia-chromium refractory to which no alumina-based raw material was added was manufactured in the same process as in Examples 1 to 3 above, and its physical property values are also shown.
それぞれの物性値は以下のようにして調べた。The physical property values of each were investigated as follows.
気孔率（％）：ＪＩＳ Ｒ２２０５による。Porosity (%): According to JIS R2205.
嵩比重 ：ＪＩＳ Ｒ２２０５による。Bulk specific gravity: According to JIS R2205.
曲げ強さ（ｋｇｆ ／ｃｔＡ、 ａ ｔ １４００℃）
：ＪＩＳ Ｒ２２１３による。Bending strength (kgf/ctA, at 1400℃)
: According to JIS R2213.
溶損指数 ：高周波炉内張法により評価１６５０℃×
４時間、溶鋼による溶損量を比較例１を１００とする指
数で示す。Melting index: Evaluated by high frequency furnace lining method 1650℃×
The amount of erosion due to molten steel for 4 hours is expressed as an index, with Comparative Example 1 being 100.
耐スポーリング性：耐火物を１２００℃に保持した電気
炉に挿入し、１５分間加熱、１５分間空冷を行う試験を
１サイクルとして、耐火物の組織が剥落するまでのサイ
クル数を調べた。Spalling resistance: A refractory was inserted into an electric furnace maintained at 1200° C., and one cycle was a test in which the refractory was heated for 15 minutes and air cooled for 15 minutes, and the number of cycles until the structure of the refractory peeled off was investigated.
第１表に示すように、気孔率、嵩比重、■４゜０℃での
曲げ強さのいずれも、比較例１として示した従来のマグ
ネシア−クロム質耐火物と顕著な差異は認められない。As shown in Table 1, there is no noticeable difference in porosity, bulk specific gravity, and bending strength at 4° to 0°C compared to the conventional magnesia-chromium refractory shown as Comparative Example 1. .
また、実施例１．２においては溶損指数は比較例１より
も低い値を示した。Further, in Example 1.2, the erosion index showed a lower value than in Comparative Example 1.
更に、実施例１〜３では、上記耐スポーリング性に関す
る試験で本発明の実施例１〜３のいずれも、比較例１よ
りも耐久ポーリング性の大幅な向」二を示す結果が得ら
れた。Furthermore, in Examples 1 to 3, in the above-mentioned spalling resistance test, all of Examples 1 to 3 of the present invention showed a significant improvement in durable polling resistance compared to Comparative Example 1. .
尚、本発明は上記実施例に限られるものではなく、本発
明で開示した趣旨を逸脱しない範囲で種々の応用が可能
であることはいうまでもない。It goes without saying that the present invention is not limited to the above-mentioned embodiments, and that various applications can be made without departing from the spirit disclosed in the present invention.
〈以下余白〉
本発明による実施例と従来の耐火物との比較筒 １
表
〔発明の効果〕
以」二、説明したように、本発明によれば、マグネシア
−クロム質耐火物において、骨材にアルミナ系原料を添
加することによって、従来のマグネシア−クロム質耐火
物の特長を損なうことなく１、耐スポーリング性の著し
く向上したマグネシアクロム質耐火物を提供することが
できる。<Left below> Comparison of embodiments of the present invention and conventional refractories 1
Table [Effects of the Invention] As explained in Section 2, according to the present invention, in magnesia-chromium refractories, an alumina-based raw material is added to the aggregate, thereby improving the conventional magnesia-chromium refractories. 1. A magnesia chromium refractory with significantly improved spalling resistance can be provided without sacrificing its features.
Claims (1)
５ｍｍ以下のアルミナ系原料を外掛けで０．５〜１０重
量％添加することを特徴とするマグネシア−クロム質耐
火物。(1) A magnesia-chromium refractory characterized by adding 0.5 to 10% by weight of an alumina-based raw material having a particle size of 5 mm or less to an aggregate made of magnesia-chromium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2105765A JPH046150A (en) | 1990-04-20 | 1990-04-20 | Magnesia-chrome refractories |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2105765A JPH046150A (en) | 1990-04-20 | 1990-04-20 | Magnesia-chrome refractories |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH046150A true JPH046150A (en) | 1992-01-10 |
Family
ID=14416286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2105765A Pending JPH046150A (en) | 1990-04-20 | 1990-04-20 | Magnesia-chrome refractories |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH046150A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05314196A (en) * | 1992-05-06 | 1993-11-26 | Nippon Electron:Kk | Graphic processing system |
| KR100481882B1 (en) * | 1999-08-30 | 2005-04-11 | 주식회사 포스코 | MONOLITHIC REFRACTORIES UTILIZED SPENT Mg-Cr BRICK |
| KR100481883B1 (en) * | 1999-08-30 | 2005-04-11 | 주식회사 포스코 | PHOSPHATE COMBINED MONOLITHIC REFRACTORIES UTILIZED SPENT Mg-Cr BRICK |
| JP2010211829A (en) * | 2010-06-07 | 2010-09-24 | Canon Inc | Information processing device, information processing method, and computer-readable recording medium |
-
1990
- 1990-04-20 JP JP2105765A patent/JPH046150A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05314196A (en) * | 1992-05-06 | 1993-11-26 | Nippon Electron:Kk | Graphic processing system |
| KR100481882B1 (en) * | 1999-08-30 | 2005-04-11 | 주식회사 포스코 | MONOLITHIC REFRACTORIES UTILIZED SPENT Mg-Cr BRICK |
| KR100481883B1 (en) * | 1999-08-30 | 2005-04-11 | 주식회사 포스코 | PHOSPHATE COMBINED MONOLITHIC REFRACTORIES UTILIZED SPENT Mg-Cr BRICK |
| JP2010211829A (en) * | 2010-06-07 | 2010-09-24 | Canon Inc | Information processing device, information processing method, and computer-readable recording medium |
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