JPH04193759A - Carbon-containing basic refractory - Google Patents
Carbon-containing basic refractoryInfo
- Publication number
- JPH04193759A JPH04193759A JP2323492A JP32349290A JPH04193759A JP H04193759 A JPH04193759 A JP H04193759A JP 2323492 A JP2323492 A JP 2323492A JP 32349290 A JP32349290 A JP 32349290A JP H04193759 A JPH04193759 A JP H04193759A
- Authority
- JP
- Japan
- Prior art keywords
- carbon
- refractory
- basic
- raw material
- containing basic
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 239000011822 basic refractory Substances 0.000 title claims abstract description 18
- 229910052799 carbon Inorganic materials 0.000 title claims description 40
- 239000000843 powder Substances 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims description 24
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 10
- 229910052796 boron Inorganic materials 0.000 claims description 4
- 239000011819 refractory material Substances 0.000 abstract description 14
- 230000003647 oxidation Effects 0.000 abstract description 12
- 238000007254 oxidation reaction Methods 0.000 abstract description 12
- 238000002156 mixing Methods 0.000 abstract description 6
- 229910002804 graphite Inorganic materials 0.000 abstract description 5
- 239000010439 graphite Substances 0.000 abstract description 5
- 239000003575 carbonaceous material Substances 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- 239000011134 resol-type phenolic resin Substances 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 18
- 239000000395 magnesium oxide Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000011449 brick Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 229910052810 boron oxide Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 238000004901 spalling Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910002090 carbon oxide Inorganic materials 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229920003987 resole Polymers 0.000 description 1
- 239000011269 tar Substances 0.000 description 1
- 239000011271 tar pitch Substances 0.000 description 1
- 230000004580 weight loss Effects 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、特に炭素含有塩基性耐火物に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to refractories, and particularly to carbon-containing basic refractories.
炭素原料を配合した炭素含有耐火物は耐スポーリング性
が向上するとともに、スラグや溶融金属に対する耐食性
も向上することなどから、近年幅広い用途に適用されて
いる。特に、有機結合剤を用いた炭素含有不焼成耐火物
は焼成を必要とせず省エネルギー化の要請にも適合して
いることから、種々の耐火材原料と組み合わせて各種実
炉に用いられている。Carbon-containing refractories blended with carbon raw materials have improved spalling resistance and corrosion resistance against slag and molten metal, so they have been applied to a wide range of applications in recent years. In particular, carbon-containing unfired refractories using organic binders do not require firing and meet the demand for energy conservation, so they are used in various actual furnaces in combination with various refractory raw materials.
上記不焼成耐火物のうち、例えば焼成マグネシアクリン
カ−あるいは電融マグネシア等の塩基性原料と、例えば
鱗状黒鉛等の炭素原料を配合したＭｇ０−Ｃ質れんがの
ような炭素含有塩基性耐火物は転炉、電気炉等に多く使
用され、飛躍的に炉寿命を延長させているが、かかるＭ
ｇ０−Ｃ質れんが等の炭素含有塩基性耐火物の組織間の
結合は、比較的結合力に乏しい炭素結合に依存している
ため、熱間強度が低く、強い酸化性雰囲気下においては
、急速に炭素原料が酸化され組織が脆弱化して溶損速度
が著しく増大するという欠点が指摘されている。Among the above-mentioned unfired refractories, carbon-containing basic refractories such as Mg0-C bricks, which are made by blending a basic raw material such as fired magnesia clinker or fused magnesia with a carbon raw material such as scaly graphite, are It is widely used in furnaces, electric furnaces, etc., and has dramatically extended the life of the furnace.
The bonds between structures in carbon-containing basic refractories such as g0-C bricks rely on carbon bonds that have relatively poor bonding strength, so their hot strength is low and they rapidly break down in a strong oxidizing atmosphere. It has been pointed out that the carbon raw material is oxidized, the structure becomes weaker, and the erosion rate increases significantly.
そこで、上記炭素成分の受ける酸化作用を抑制して、熱
間強度特性を改善するために炭素含有塩基性耐火物の原
料に、例えばＡＩ、ＳｉやＡ１−Ｓｉ合金等の易酸化性
金属を添加することが提案されている。Therefore, in order to suppress the oxidation effect of the above-mentioned carbon components and improve hot strength properties, easily oxidizable metals such as AI, Si, and A1-Si alloy are added to the raw materials of carbon-containing basic refractories. It is proposed to do so.
しかしながら、上記ＳｌやＡｊ！−８ｉ合金を添加した
炭素含有塩基性耐火物の耐酸化性や熱間強度特性は向上
する一方で耐スラグ性が低下する傾向があり、Ａβ単体
が添加される例が多い。However, the above Sl and Aj! Although the oxidation resistance and hot strength properties of carbon-containing basic refractories to which the -8i alloy is added tend to improve, the slag resistance tends to decrease, and Aβ alone is often added.
ところがＡβを添加した例えば不焼成ＭｇＯ−〇質れん
がのような炭素含有塩基性耐火物は１０００℃以上の熱
間における強度特性を著しく改善でき、かつ、酸化雰囲
気において優れた抵抗性を付与せしめることが可能であ
るが、結合剤として添加したフェノールレジンやタール
ピッチの分解温度である４００℃付近から、ＡＡによる
熱間強度の増大の効果が顕れる温度の１０００℃付近ま
での温度域で脆弱層が形成されるために該温度域での熱
間強度は低下し、さらに上記脆弱層を中心に亀裂が発生
して剥離が生じる、いわゆる構造スポーリングによる損
耗を引き起こす。However, carbon-containing basic refractories, such as unfired MgO bricks, to which Aβ is added can significantly improve strength properties at temperatures above 1000°C, and also provide excellent resistance in oxidizing atmospheres. However, in the temperature range from around 400°C, which is the decomposition temperature of the phenol resin and tar pitch added as a binder, to around 1000°C, the temperature at which the effect of increasing hot strength by AA becomes apparent, the brittle layer becomes Due to this formation, the hot strength in the temperature range decreases, and furthermore, cracks occur mainly in the fragile layer and peeling occurs, which causes wear due to so-called structural spalling.
本発明は上記従来の事情に鑑み提案されたものであり、
耐酸化性に優れ、安定した耐用性を発揮する炭素含有塩
基性耐火物を提供することを目的とする。The present invention has been proposed in view of the above-mentioned conventional circumstances,
The purpose of the present invention is to provide a carbon-containing basic refractory that has excellent oxidation resistance and exhibits stable durability.
上記の目的を達成するために本発明では以下の手段を採
用する。すなわち、炭素原料５〜３０重量％、塩基性原
料７０〜９５重量％からなる耐火材原料に対し、単体硼
素（Ｂ）粉末を外掛け０１１〜４重量％添加する構成と
した炭素含有塩基性耐火物である。In order to achieve the above object, the present invention employs the following means. That is, the carbon-containing basic refractory is constructed by adding 0.11 to 4% by weight of elemental boron (B) powder to a refractory raw material consisting of 5 to 30% by weight of a carbon raw material and 70 to 95% by weight of a basic raw material. It is a thing.
この発明の炭素含有塩基性耐火物において、硼素粉末は
耐火物の表面付近で酸化して酸化硼素となり、耐火材料
中の諸成分、例えばＭｇＯなどとともに、粘性の高い融
液を形成して該耐火物の表面を被覆し、含有される炭素
成分の酸化・消失を防止する。In the carbon-containing basic refractory of this invention, the boron powder oxidizes to boron oxide near the surface of the refractory, and together with various components in the refractory material, such as MgO, forms a highly viscous melt to form the refractory material. Coats the surface of objects to prevent oxidation and loss of carbon components contained in them.
また、硼素粉末はこの発明の炭素含有不焼成耐火物の成
形体（例えばれんが）が１２００℃以上に昇温されたと
きに、その内部で例えばマグネシアのような塩基性原料
と反応してマグネシウムと酸化硼素を生成し、このとき
生成したマグネシウムは容易に酸化作用を受けるので、
炭素成分の酸化・消失を防止する。Furthermore, when the carbon-containing unfired refractory compact (e.g. brick) of the present invention is heated to 1,200°C or higher, the boron powder reacts with a basic raw material such as magnesia to form magnesium. Boron oxide is produced, and the magnesium produced at this time is easily oxidized, so
Prevents oxidation and disappearance of carbon components.
更に、硼素粉末は高温において炭素とは反応しないが、
−酸化炭素と反応して酸化硼素と炭素を生成（すなわち
、−酸化炭素を炭素に還元）し、酸化によって減少した
炭素成分を補填するとともに、れんが組織を緻密化して
炭素含有耐火物の耐酸化性を向上させる。Additionally, boron powder does not react with carbon at high temperatures;
-Reacts with carbon oxide to produce boron oxide and carbon (i.e., reduces -carbon oxide to carbon), replenishes the carbon component decreased by oxidation, and densifies the brick structure to prevent oxidation of carbon-containing refractories. Improve your sexuality.
この発明の炭素含有塩基性耐火物に使用することができ
るＭｇ○質原料としては、焼結マグネシア、電融マグネ
シア、天然マグネシア等が使用できる。また、炭素質原
料としては例えば鱗状黒鉛を使用することができ、その
配合量は本発明が適用される炭素含有塩基性耐火物の用
途によって異なるが、耐火材料全量に対し５〜３０重量
％が好ましい。特に上記鱗状黒鉛を炭素質原料として添
加する場合、５重量％未滴の配合量では高い耐スポーリ
ング性等の炭素原料を配合することによって得られる効
果を充分発揮できず、また、３０重量％を超えると耐食
性が低下し好ましくない。Sintered magnesia, fused magnesia, natural magnesia, etc. can be used as the Mg○ raw material that can be used in the carbon-containing basic refractory of the present invention. In addition, as the carbonaceous raw material, for example, scaly graphite can be used, and its blending amount varies depending on the use of the carbon-containing basic refractory to which the present invention is applied, but it is 5 to 30% by weight based on the total amount of the refractory material. preferable. In particular, when adding the above scale graphite as a carbonaceous raw material, the effects obtained by blending the carbon raw material, such as high spalling resistance, cannot be sufficiently exhibited with a blending amount of 5% by weight, and 30% by weight. Exceeding this is not preferable because corrosion resistance decreases.
この発明の炭素含有塩基性耐火物に使用する硼素粉末の
粒径は、反応性、均一性、分散性など反応活性化の面か
ら２５０μｍ以下であることが好ましく、４４μｍ以下
であることがより好ましい。The particle size of the boron powder used in the carbon-containing basic refractory of this invention is preferably 250 μm or less, more preferably 44 μm or less, from the viewpoint of reaction activation such as reactivity, uniformity, and dispersibility. .
また、硼素粉末の添加量は黒鉛などの炭素原料とマグネ
シア質耐火材料とを配合した耐火材料に対して、外掛け
０．１〜４重量％の範囲にあることが好ましい。硼素粉
末の添加量が０．１重量％未満である場合には、炭素の
減少防止、結合の緻密化などに関して所期の効果が得ら
れず、また、４重量％を上回ると耐酸化性は得られるが
、酸化硼素が過剰に生成して耐食性が劣化するからであ
る。Further, the amount of boron powder added is preferably in the range of 0.1 to 4% by weight based on the refractory material prepared by blending a carbon raw material such as graphite with a magnesia refractory material. If the amount of boron powder added is less than 0.1% by weight, the desired effects such as prevention of carbon loss and densification of bonds will not be obtained, and if it exceeds 4% by weight, oxidation resistance will deteriorate. However, excessive boron oxide is produced and the corrosion resistance deteriorates.
なお、この発明を実施する上で発明の効果を損なわない
範囲でタール、ピッチ、フェノールレジンなどの残留炭
素量の多い有機結合剤その他の結合剤を添加することも
できる。In carrying out the present invention, organic binders with a large amount of residual carbon such as tar, pitch, phenol resin, and other binders may be added to the extent that the effects of the present invention are not impaired.
本発明では炭素含有塩基性耐火物の製造方法は特に限定
せず従来公知の方法で製造することができ、例えば上記
材料を配合した耐火物原料を混練した後加圧成形し、２
５〜２００℃程度で乾燥熱処理することにより得られる
。、
〔実施例〕
以下に実施例及び比較例を示し、本発明の特徴とすると
ころをより一層明確にする。In the present invention, the method for producing the carbon-containing basic refractory is not particularly limited and can be produced by a conventionally known method.
It is obtained by dry heat treatment at about 5 to 200°C. , [Example] Examples and comparative examples are shown below to further clarify the characteristics of the present invention.
第１表上欄に示す本発明品及び比較界の配合物にレゾー
ル型フェノールレジンを外掛け３重量％添加する。A total of 3% by weight of resol type phenol resin was added to the formulations of the present invention and comparative products shown in the upper column of Table 1.
上記配合を常温にて４０分間混練後、１０００ｋｇ ｆ
／ ｃｎｆの圧力で４０ｘ４０ｘ１６０ｍｍの形状に
加圧成形し、１８０度で１０時間熱処理して得られた不
焼成耐火物の品質特性を第１表下欄に併せて示す。After kneading the above formulation at room temperature for 40 minutes, 1000 kg f
/ cnf pressure into a shape of 40x40x160 mm and heat-treated at 180 degrees for 10 hours. The quality characteristics of the unfired refractory obtained are also shown in the lower column of Table 1.
第１表下欄からもわかるように、炭素質原料を含む耐火
材料に硼素を添加した本発明による炭素含有塩基性耐火
物は、比較例よりも重量減少率、脱炭層厚さとも少なく
、また溶損指数（比較例１の試料の断面において測定し
た溶損面積を１００として相対的な指数であられした）
も抑えることができ、耐酸化性、耐食性が向上したこと
を示している。As can be seen from the lower column of Table 1, the carbon-containing basic refractory according to the present invention, which is a refractory material containing a carbonaceous raw material added with boron, has a lower weight loss rate and a less decarburized layer thickness than the comparative example. Erosion index (relative index with the erosion area measured on the cross section of the sample of Comparative Example 1 as 100)
This shows that oxidation resistance and corrosion resistance have been improved.
尚、本発明は上記実施例に限定されるものではなく、種
々の塩基性原料との組合せにおいても同様の効果を発揮
することは明らかである。It should be noted that the present invention is not limited to the above embodiments, and it is clear that similar effects can be achieved in combination with various basic raw materials.
く以下余白〉
第 １ 表
〔発明の効果〕
以上のように本発明によれば、炭素原料５〜３０重量％
、塩基性原料７０〜９５重量％からなる耐火材原料に対
し、単体硼素（Ｂ）粉末を外掛け０．１〜４重量％添加
することによって、炭素原料の酸化・消失を防止するこ
とができるので、従来品よりも優れた耐用性を備える炭
素含有塩基性耐火物を得ることができ、炉寿命のさらな
る延長に寄与するものである。Table 1 [Effects of the invention] As described above, according to the present invention, carbon raw materials of 5 to 30% by weight
By adding 0.1 to 4% by weight of elemental boron (B) powder to the refractory raw material consisting of 70 to 95% by weight of the basic raw material, oxidation and disappearance of the carbon raw material can be prevented. Therefore, it is possible to obtain a carbon-containing basic refractory with superior durability than conventional products, contributing to further extension of furnace life.
Claims (1)
重量％からなる耐火材原料に対し、単体硼素（Ｂ）粉末
を外掛け０．１〜４重量％添加したことを特徴とする炭
素含有塩基性耐火物。[Scope of Claims] [1] Carbon raw material 5-30% by weight, basic raw material 70-95%
1. A carbon-containing basic refractory characterized in that 0.1 to 4% by weight of elemental boron (B) powder is added to the refractory raw material consisting of 0.1 to 4% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2323492A JPH04193759A (en) | 1990-11-26 | 1990-11-26 | Carbon-containing basic refractory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2323492A JPH04193759A (en) | 1990-11-26 | 1990-11-26 | Carbon-containing basic refractory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04193759A true JPH04193759A (en) | 1992-07-13 |
Family
ID=18155293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2323492A Pending JPH04193759A (en) | 1990-11-26 | 1990-11-26 | Carbon-containing basic refractory |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04193759A (en) |
-
1990
- 1990-11-26 JP JP2323492A patent/JPH04193759A/en active Pending
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