JPH06211567A - Magnesia-spinel brick for cement rotary kiln - Google Patents

Magnesia-spinel brick for cement rotary kiln

Info

Publication number
JPH06211567A
JPH06211567A JP4336705A JP33670592A JPH06211567A JP H06211567 A JPH06211567 A JP H06211567A JP 4336705 A JP4336705 A JP 4336705A JP 33670592 A JP33670592 A JP 33670592A JP H06211567 A JPH06211567 A JP H06211567A
Authority
JP
Japan
Prior art keywords
magnesia
clinker
rotary kiln
spinel brick
cement rotary
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.)
Granted
Application number
JP4336705A
Other languages
Japanese (ja)
Other versions
JP2527118B2 (en
Inventor
Eiji Kawamoto
本 英 司 川
Takeshi Yoshida
田 毅 吉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TYK Corp
Original Assignee
TYK Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TYK Corp filed Critical TYK Corp
Priority to JP4336705A priority Critical patent/JP2527118B2/en
Publication of JPH06211567A publication Critical patent/JPH06211567A/en
Application granted granted Critical
Publication of JP2527118B2 publication Critical patent/JP2527118B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Landscapes

  • Compositions Of Oxide Ceramics (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

PURPOSE:To improve the cement coating characteristics of magnesia-spinel brick by adding electromelted or fired magnesia-chrome clinker. CONSTITUTION:Electromelted or fired magnesia-chrome clinker contg. 10-50% Cr2O3 and 50-80% MgO and having 1-3mm diameter is added by 5-30wt.%.

Description

【発明の詳細な説明】Detailed Description of the Invention

【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係るものであり、詳しくはセ
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 a lining of a cement rotary kiln, and more particularly to a magnesia spinel brick for a cement rotary kiln.

【０００２】[0002]

【従来の技術】セメントロータリーキルンの内張り用耐
火れんが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。そして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 as refractory bricks for lining cement rotary kilns. At present, the amount of magnesia spinel is increasing due to the chromium disposal problem, but it has the following fundamental defects.

【０００３】（１）セメントコーティング特性が劣る。 （２）熱間強度が低く、耐摩耗性に劣る。 （３）アルカリ浸透が多い。 （４）熱伝導率が高いためシェルの変形を招く。(1) Poor cement coating characteristics. (2) The hot strength is low and the wear resistance is poor. (3) Alkali penetration is large. (4) High thermal conductivity causes deformation of the shell.

【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。
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。Among 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 deformation.
To solve this problem, a method of reacting with a clinker with an additive such as SiO 2 to promote the formation of an appropriate liquid phase, or a method of increasing the contact area by making the surface uneven by mixing the particle size, etc., are sufficiently satisfactory. In reality, it is not completely replaced by magnesia chrome.

【０００５】[0005]

【発明が解決しようとする課題】本発明ではコーティン
グ特性を改善するため、電融又は焼成マグネシアクロム
クリンカーを添加することによりマグネシアスピネルれ
んがのセメントコーティング特性を改善することがねら
いである。SUMMARY OF THE INVENTION In order to improve the coating properties of the present invention, it is an object of the present invention to improve the cement coating properties of magnesia spinel bricks by adding electromelted or calcined magnesia chrome clinker.

【０００６】[0006]

【課題を解決するための手段】本発明ではマグネシア・
クロムクリンカーを骨材に配することにより従来のマグ
ネシアスピネルれんがのセメントコーティング特性を改
善することが可能となった。In the present invention, magnesia
By placing chrome clinker on the aggregate, it was possible to improve the cement coating properties of conventional magnesia spinel bricks.

【０００７】セメントクリンカーのコーティングメカニ
ズムは主成分であるＣａＯと適正な液相を生成し、か
つ、れんが接触面で飽和，固相化し、成長するというの
が基本であると考えられている。従来のマグネシアスピ
ネルれんがはマグネシアクリンカーとマグネシアスピネ
ルクリンカーの混合焼結体であり、セメントの主成分で
あるＣａＯとは安定な液相を生成しないことがコーティ
ング性に劣る要因であった。そこでマグネシアクロム質
れんがの特性を考慮し、マグネシアクロムクリンカーを
骨材に配することによりコーティング特性の改善を試み
た。マグネシアクロムクリンカーとは一般的にＭｇＯ５
０％以上，Ｃｒ2Ｏ3１０％以上を有しており、その他Ａ
ｌ2Ｏ3，Ｆｅ2Ｏ3，ＳｉＯ2を４０％以下は有してい
る。そのため粒径の細かい，つまりマトリックス部への
添加は主成分ＭｇＯとの反応のため低融点化及び製造面
での歩留低下を加味すれば技術的に困難である。従って
マグネシアスピネルれんがの物理特性を低下させること
なく、従来品のマグネシアクリンカー骨材に置換する形
で改善を試みた。そして種々の配合試験を実施した結果
５％未満では特性の変化は認められず、３０％以上の添
加は中・微粒への拡大を招き、特性の低下を招くことが
判った。[0007] It is considered that the coating mechanism of cement clinker is basically that it forms a proper liquid phase with CaO as the main component, and that the brick is saturated and solidified at the contact surface and grows. The conventional magnesia spinel brick is a mixed sintered body of magnesia clinker and magnesia spinel clinker, and the fact that CaO, which is the main component of cement, does not form a stable liquid phase was a factor of poor coating properties. Considering the properties of magnesia chrome bricks, we tried to improve the coating properties by placing magnesia chrome clinker on the aggregate. Magnesia chrome clinker is generally MgO5
0% or more, Cr 2 O 3 10% or more, other A
It has less than 40% of 1 2 O 3 , Fe 2 O 3 , and SiO 2 . For this reason, it is technically difficult to add fine particles, that is, to add to the matrix part in view of lowering the melting point and lowering the yield in terms of production due to the reaction with the main component MgO. Therefore, we tried to improve the magnesia spinel brick by replacing it with the conventional magnesia clinker aggregate without deteriorating the physical properties. As a result of conducting various compounding tests, it was found that when the content was less than 5%, the characteristics were not changed, and when the content was more than 30%, the characteristics were expanded to medium and fine particles and the characteristics were deteriorated.

【０００８】[0008]

【実施例】次に本発明品及び比較例の配合組成と特性を
表１に示す。本発明に使用したマグネシアクロムクリン
カーは、ＭｇＯ５９重量％，Ｃｒ2Ｏ3１７重量％の焼成
マグネシアクロムクリンカーを３−１ｍｍに整粒したも
のを使用した。EXAMPLES Next, Table 1 shows the composition and characteristics of the products of the present invention and comparative examples. The magnesia chrome clinker used in the present invention was obtained by sizing the burned magnesia chrome clinker containing 59% by weight of MgO and 17% by weight of Cr 2 O 3 to 3-1 mm.

【０００９】（製造方法）マグネシアクリンカー，マグ
ネシアスピネルクリンカーと焼成マグネシアクロムクリ
ンカーの３−１ｍｍ整粒品を重量配合し、バインダーを
加え混練，プレス成形し、トンネル窯にて焼成した。(Manufacturing method) Magnesia clinker, magnesia spinel clinker and calcined magnesia chrome clinker 3-1 mm sized product were blended by weight, added with a binder, kneaded, press-molded, and calcined in a tunnel kiln.

【００１０】[0010]

【表１】 [Table 1]

【００１１】本発明品はセメントコーティング特性に優
れ、更に熱間強度の向上にも大きな効果が現われた。コ
ーティング評価テストにおいて以下の結果を得た。The product of the present invention was excellent in cement coating properties, and exhibited a great effect in improving hot strength. The following results were obtained in the coating evaluation test.

【００１２】 （テスト条件） 回転ドラム法 従来品 試作品（実施例ＮＯ．３） コーティング厚み（ｍｍ） ２.０ ６．０(Test Conditions) Rotating Drum Method Conventional Product Prototype (Example No. 3) Coating Thickness (mm) 2.0 6.0

【００１３】本発明品は骨材の一部をマグネシアクリン
カーからマグネシアクロムクリンカーに置換することに
より大巾なコーティング特性の改善をラボテストにて得
られ、従来品に比較して３倍かつ熱間強度１．６倍の増
加を得ることができた。In the product of the present invention, a large improvement in coating characteristics was obtained in a lab test by substituting a part of the aggregate with a magnesia chrome clinker, and the hot strength was three times that of the conventional product. A 1.6-fold increase could be obtained.

Claims (1)

【特許請求の範囲】[Claims] Ｃｒ2Ｏ3を１０〜５０％，ＭｇＯを５０〜８０％含む電
融または焼結マグネシアクロムクリンカーの粒径１〜３
ｍｍを５〜３０重量％配する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。Particle size 1 to 3 of fused or sintered magnesia chrome clinker containing 10 to 50% of Cr 2 O 3 and 50 to 80% of MgO
A magnesia spinel brick for cement rotary kiln, which is characterized by arranging mm in an amount of 5 to 30% by weight.
JP4336705A 1992-11-24 1992-11-24 Cement rotary kiln magnesia spinel brick Expired - Lifetime JP2527118B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4336705A JP2527118B2 (en) 1992-11-24 1992-11-24 Cement rotary kiln magnesia spinel brick

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4336705A JP2527118B2 (en) 1992-11-24 1992-11-24 Cement rotary kiln magnesia spinel brick

Publications (2)

Publication Number Publication Date
JPH06211567A true JPH06211567A (en) 1994-08-02
JP2527118B2 JP2527118B2 (en) 1996-08-21

Family

ID=18301945

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4336705A Expired - Lifetime JP2527118B2 (en) 1992-11-24 1992-11-24 Cement rotary kiln magnesia spinel brick

Country Status (1)

Country Link
JP (1) JP2527118B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61201657A (en) * 1985-03-04 1986-09-06 宇部化学工業株式会社 High density sintered magnesia-chromium clinker and manufacture
JPH04310561A (en) * 1991-04-10 1992-11-02 Asahi Glass Co Ltd Magnesia spinel refractory

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61201657A (en) * 1985-03-04 1986-09-06 宇部化学工業株式会社 High density sintered magnesia-chromium clinker and manufacture
JPH04310561A (en) * 1991-04-10 1992-11-02 Asahi Glass Co Ltd Magnesia spinel refractory

Also Published As

Publication number Publication date
JP2527118B2 (en) 1996-08-21

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