JPH06100357A - Magnesia spinel brick for cement rotary kiln - Google Patents
Magnesia spinel brick for cement rotary kilnInfo
- Publication number
- JPH06100357A JPH06100357A JP4273625A JP27362592A JPH06100357A JP H06100357 A JPH06100357 A JP H06100357A JP 4273625 A JP4273625 A JP 4273625A JP 27362592 A JP27362592 A JP 27362592A JP H06100357 A JPH06100357 A JP H06100357A
- Authority
- JP
- Japan
- Prior art keywords
- strength
- natural
- rotary kiln
- cement rotary
- ore
- 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
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
(57)【要約】
【目的】 従来の技術では解決されていないコーティン
グ特性を改善するのと同時に強度の向上及び熱伝導率の
低下を図ることにある。
【構成】 粒径１〜３mmの天然クロム鉱石を１〜１０重
量％含んだことを特徴としている。
【効果】 コーティング特性に優れ、天然クロム鉱石の
無添加品に比較し、強度も圧縮強度で５５０〜６００kg
/cm2程と高く、また熱伝導率も４．０〜４．２Kcal/mh
℃程と低く、大幅に改善された効果を発揮できる。(57) [Abstract] [Purpose] It is intended to improve coating properties, which have not been solved by conventional techniques, and at the same time, to improve strength and decrease thermal conductivity. [Structure] It is characterized by containing 1 to 10% by weight of natural chromium ore having a particle size of 1 to 3 mm. [Effect] Superior in coating properties, compared to non-added natural chrome ore, the strength is 550 to 600 kg in compressive strength.
/ cm 2 and high thermal conductivity of 4.0-4.2Kcal / mh
It is as low as ℃, and can show a significantly improved effect.
Description
【０００１】[0001]
【産業上の利用分野】本発明はセメントロータリーキル
ンの内張り用耐火れんが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 brick for lining a cement rotary kiln.
【０００２】[0002]
【従来の技術】セメントロータリーキルンには主にマグ
ネシアクロム質とマグネシアスピネル質が使用されてい
る。現在クロムの廃棄問題でマグネシアスピネル質が増
加しつつあるが根本的に以下の欠点を有している。2. Description of the Related Art Magnesia chrome and magnesia spinel are mainly used in cement rotary kilns. At present, the magnesia spinel quality is increasing due to the chromium disposal problem, but it has the following fundamental defects.
【０００３】(１)コーティング特性が劣る。 (２)強度が低い。 (３)アルカリ浸透が多い。 (４)熱伝導率が高い。(1) Coating properties are poor. (2) Low strength. (3) Alkali penetration is large. (4) High thermal conductivity.
【０００４】これらの中で、使用上最も大きな問題点は
コーティング特性が劣ることにある。コーティングは耐
火物を保護し直接反応を抑制するのみではなく、キルン
のシェル温度を下げ、変形も抑制する重要な特性であ
る。Of these, the biggest problem in use is that the coating properties are poor. The coating is an important property that not only protects the refractory and suppresses the direct reaction, but also lowers the shell temperature of the kiln and suppresses the deformation.
【０００５】この問題に対し、添加物，例えばＳｉＯ2
等によりクリンカーと反応させ適正な液相の生成を促す
方法、あるいは粒度配合により表面を凹凸化させ接触面
積を増加させる方法などが試みられてきたが、充分満足
できる結果は得られておらず、マグネシアクロム質から
完全に代替されていないのが実情である。To address this problem, additives such as SiO 2
A method of promoting the generation of an appropriate liquid phase by reacting with a clinker, etc., or a method of increasing the contact area by making the surface uneven by particle size blending has been tried, but satisfactory results have not been obtained, The reality is that it is not completely replaced by magnesia chrome.
【０００６】[0006]
【考案が解決しようとする課題】本考案は従来の技術で
は解決されていないコーティング特性を改善するのと同
時に強度の向上，熱伝導率の低下を図ることが望まれて
いる。SUMMARY OF THE INVENTION In the present invention, it is desired to improve the coating characteristics, which have not been solved by the conventional techniques, and at the same time, to improve the strength and decrease the thermal conductivity.
【０００７】[0007]
【課題を解決するための手段】本考案では、コーティン
グ特性を改善するために天然クロム鉱石粒を添加するこ
とにより組織面と化学組成面の両者よりアプローチし
た。In the present invention, an approach was taken from both the aspect of texture and the aspect of chemical composition by adding natural chromium ore grains to improve the coating characteristics.
【０００８】つまり組織面では、天然クロム鉱石は一般
にＣｒ2Ｏ3を３０〜５０％程度含有しており、その他Ｆ
ｅ2Ｏ3，Ａｌ2Ｏ3，ＳｉＯ2であるが焼成時に天然クロ
ム鉱石よりＣｒ2Ｏ3，Ｆｅ2Ｏ3等が拡散し自身は収縮し
れんが内においてその周辺に空間が生じることを利用し
た。(図１参照)従って天然クロム鉱石１の添加量あるい
は粒径により気孔２の形態は調整することができる。セ
メントクリンカーがれんが内のこの天然クロム鉱石の周
辺空間に侵入し固化しコーティングの核となるいわゆる
“アンカー効果”が得られるのである。次に化学組成面
であるがコーティングの基本的なメカニズムは報告され
ている。それは適正な液相が必要であり、カワその中で
高融点化し固相化，つまり結合化していくというのが一
般的である。天然クロム鉱石はＳｉＯ2を３％含有して
おりセメントクリンカーと接すると容易にモンチセライ
ト(ＣａＯ．ＭｇＯ．ＳｉＯ2)等の液相を生成する。そ
して更にＣａＯが供給されると高融点化し、コーティン
グに結びつく。更にＣｒ2Ｏ3組成とは高融点結合をする
のでマグネシアクロムれんがの有利性も応用することが
できる。That is, in terms of texture, natural chromium ore generally contains Cr 2 O 3 in an amount of about 30 to 50%, and other F
e 2 O 3, Al 2 O 3, is a SiO 2 and natural chromium ore than Cr 2 O 3, Fe 2 O 3 or the like is diffused during firing itself utilize the space generated on the periphery in the contracted within brick did. (See FIG. 1) Therefore, the morphology of the pores 2 can be adjusted by the addition amount or particle size of the natural chromium ore 1. The cement clinker penetrates into the surrounding space of this natural chrome ore in the brick and solidifies to form the core of the coating, the so-called "anchor effect". Next, regarding chemical composition, the basic mechanism of coating has been reported. It requires a proper liquid phase, and it is common for the river to have a high melting point and become a solid phase, that is, to bond. Natural chromium ore contains 3% of SiO 2 and easily forms a liquid phase such as monticerite (CaO.MgO.SiO 2 ) when contacted with cement clinker. When CaO is further supplied, it has a high melting point and leads to coating. Furthermore, since it forms a high melting point bond with the Cr 2 O 3 composition, the advantages of magnesia chromium brick can also be applied.
【０００９】更にＣｒ2Ｏ3組成はマグネシアスピネルれ
んがの大半を占めるＭｇＯ組成と結合しピクロクロマイ
トを生成するため強度が高くなるとともに、天然クロム
鉱の周辺に生成される空間が断熱性をもたらし熱伝導率
を低減する効果も同時に得られる。Further, the Cr 2 O 3 composition is combined with the MgO composition, which accounts for the majority of magnesia spinel bricks, to form picrochromite, so that the strength is increased, and the space formed around the natural chrome ore provides heat insulation. At the same time, the effect of reducing the thermal conductivity can be obtained.
【００１０】ただし、天然クロム鉱石の添加方法におい
て留意する点が３つ挙げられる。１つは過剰に添加しな
いこと、つまり気孔率の一方的な増加は強度の低下を招
く、そして１つは余り微粒で使用しないこと。つまり微
粒になる程骨材であるＭｇＯ組成と反応し易くなりＭｇ
Ｏ−ＳｉＯ2系の低融点化合物を生成し、強度の低下，
スポーリングの低下に致る。又アンカー効果を示すよう
な独立した気孔が形成されない。又逆に直径が余りにも
大きいと結合を阻害するため強度の大巾な低下を招く、
セメントロータリーキルンにおいてれんがの保有する強
度はクリンカーの摩耗，キルンのオーバリティへの抵抗
性を有するためには必要な物性である。最後に過剰の使
用はクロムフリー，ロークロムといった時流に反するこ
とになる。However, there are three points to be noted in the addition method of natural chromium ore. One is not to add excessively, that is, one-sided increase in porosity leads to a decrease in strength, and one is not used in a very fine grain. That is, the finer the particles, the easier it is to react with the MgO composition that is the aggregate,
A low melting point compound of O-SiO 2 system is generated, resulting in a decrease in strength,
Spoll drop. In addition, independent pores that show the anchor effect are not formed. On the other hand, if the diameter is too large, the binding will be hindered and the strength will be greatly reduced.
The strength possessed by bricks in cement rotary kilns is a necessary physical property in order to have resistance to wear of the clinker and the excess of the kiln. Finally, excessive use is against the trend of chrome-free and low chrome.
【００１１】以上を加味し、様々な試作．配合(表１を)
重ねた結果、添加する天然クロム鉱石としては直径が１
〜３mm。(図３)添加量は１〜１０重量％(図２)が適正で
あると判断された。１％以下では殆ど効果は認められな
い。In consideration of the above, various trial productions have been made. Formulation (see Table 1)
As a result of stacking, the natural chromium ore to be added has a diameter of 1
~ 3 mm. (FIG. 3) It was determined that the addition amount of 1 to 10% by weight (FIG. 2) was appropriate. Almost no effect is observed at 1% or less.
【００１２】[0012]
【実施例】次に本発明品及び比較例を表１に示す。又本
発明に使用した天然クロム鉱石の組成を表２に示す。EXAMPLES Table 1 shows the products of the present invention and comparative examples. The composition of the natural chromium ore used in the present invention is shown in Table 2.
【００１３】(製造方法)マグネシアクリンカー，マグス
ピネルクリンカーと天然クロム鉱石を重量配合し、バイ
ンダーを加え混練プレス成形し、トンネル窯で焼成し
た。(Production Method) Magnesia clinker, magspinel clinker and natural chrome ore were blended in a weight ratio, a binder was added, kneading and press molding were performed, and the mixture was baked in a tunnel kiln.
【００１４】本発明品１をセメントロータリーキルンの
焼成帯に施工した。The product 1 of the present invention was applied to the firing zone of a cement rotary kiln.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】[0017]
【発明の効果】本発明品はコーティング特性に優れ天然
クロム鉱石の無添加品に比較し強度も圧縮強度で５５０
〜６００Kg/cm2程と高く、又熱伝導率も４．０〜４．２
Kcal/mh℃程と低く、大巾に改善された効果を発揮でき
る。The product of the present invention has excellent coating properties and is 550 in compressive strength as compared with the additive-free product of natural chromium ore.
~ 600 Kg / cm 2 and high thermal conductivity of 4.0-4.2
It is as low as Kcal / mh ℃, and it can exert a greatly improved effect.
【図１】本発明の天然クロム鉱石の周辺気孔を示す説明
図である。FIG. 1 is an explanatory view showing peripheral pores of a natural chromium ore of the present invention.
【図２】天然クロム鉱石量と圧縮強度との関係を示す線
図である。FIG. 2 is a diagram showing the relationship between the amount of natural chromium ore and compressive strength.
【図３】天然クロム鉱石径と圧縮強度との関係を示す線
図である。FIG. 3 is a diagram showing the relationship between the diameter of natural chromium ore and the compressive strength.
１ 天然クロム鉱石 ２ 気孔 1 Natural chrome ore 2 Pore
Claims (1)
ことを特徴とするセメントロータリーキルン用マグネシ
アスピネル質れんがMagnesia spinel brick for cement rotary kiln, characterized by containing 1 to 10% by weight of natural chromium ore with a particle size of 1 to 3 mm
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4273625A JPH06100357A (en) | 1992-09-17 | 1992-09-17 | Magnesia spinel brick for cement rotary kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4273625A JPH06100357A (en) | 1992-09-17 | 1992-09-17 | Magnesia spinel brick for cement rotary kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06100357A true JPH06100357A (en) | 1994-04-12 |
Family
ID=17530322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4273625A Pending JPH06100357A (en) | 1992-09-17 | 1992-09-17 | Magnesia spinel brick for cement rotary kiln |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06100357A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8986598B2 (en) | 2012-03-30 | 2015-03-24 | Korea Institute Of Science And Technology | Alumina-coated spinel-silicon carbide refractory composition with high corrosion resistance to coal slag and method for manufacturing the same |
| JP2025040203A (en) * | 2023-09-11 | 2025-03-24 | 品川リフラクトリーズ株式会社 | Manufacturing method of magnesia-spinel bricks |
-
1992
- 1992-09-17 JP JP4273625A patent/JPH06100357A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8986598B2 (en) | 2012-03-30 | 2015-03-24 | Korea Institute Of Science And Technology | Alumina-coated spinel-silicon carbide refractory composition with high corrosion resistance to coal slag and method for manufacturing the same |
| JP2025040203A (en) * | 2023-09-11 | 2025-03-24 | 品川リフラクトリーズ株式会社 | Manufacturing method of magnesia-spinel bricks |
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