JPH02275752A - Production mullite material - Google Patents
Production mullite materialInfo
- Publication number
- JPH02275752A JPH02275752A JP1091622A JP9162289A JPH02275752A JP H02275752 A JPH02275752 A JP H02275752A JP 1091622 A JP1091622 A JP 1091622A JP 9162289 A JP9162289 A JP 9162289A JP H02275752 A JPH02275752 A JP H02275752A
- Authority
- JP
- Japan
- Prior art keywords
- mullite
- alumina
- coal ash
- ash
- products
- 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
Links
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052863 mullite Inorganic materials 0.000 title claims abstract description 37
- 239000000463 material Substances 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000010883 coal ash Substances 0.000 claims abstract description 24
- 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 19
- 238000010304 firing Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000007493 shaping process Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 24
- 229910052742 iron Inorganic materials 0.000 abstract description 12
- 239000002956 ash Substances 0.000 abstract description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000919 ceramic Substances 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 238000005262 decarbonization Methods 0.000 abstract description 4
- 238000001354 calcination Methods 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 3
- 239000006148 magnetic separator Substances 0.000 abstract description 3
- 239000006260 foam Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 22
- 239000002994 raw material Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000000975 co-precipitation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
- 238000005118 spray pyrolysis Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241001532211 Cordyline fruticosa Species 0.000 description 1
- 235000009091 Cordyline terminalis Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- OKTJSMMVPCPJKN-YPZZEJLDSA-N carbon-10 atom Chemical compound [10C] OKTJSMMVPCPJKN-YPZZEJLDSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000005406 washing Methods 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）
本発明はセラミックス用ムライト系材料の製造方法に関
する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for producing a mullite-based material for ceramics.
（従来の技術）
各種の燃焼炉から排出される石炭灰は、現在その４０％
がセメント原料、ケイ酸カリ肥料、軽量骨材等に有効利
用されている。しかし残りは有効利用することなくただ
埋立地に廃棄されているのが実情である。しかし廃棄は
年々埋立地もなくなり、公害等が発生し社会問題となっ
ている。したかって石炭灰の有効利用率を高めることが
重要な課題になっている。(Conventional technology) Currently, 40% of coal ash is discharged from various combustion furnaces.
It is effectively used as a raw material for cement, potassium silicate fertilizer, lightweight aggregate, etc. However, the reality is that the remaining waste is simply disposed of in landfills without being put to effective use. However, as the number of landfill sites disappears year by year, waste disposal is becoming a social problem, causing pollution and other problems. Therefore, increasing the effective utilization rate of coal ash has become an important issue.
一方、ファインセラミックス原料として近年ムライトが
注目されて来ている。ムライトは高温圧縮強度、クリー
プ強度ともアルミナよりはるかに大きく、炭化ケイ素に
匹敵する材料であり酸化物系の高温構造材料として注目
されている。しかしムライトは、天然にはまれな鉱物で
ある。On the other hand, mullite has recently attracted attention as a raw material for fine ceramics. Mullite has much higher high-temperature compressive strength and creep strength than alumina, is comparable to silicon carbide, and is attracting attention as an oxide-based high-temperature structural material. However, mullite is a mineral that is rare in nature.
大エムライＩ・の合成法としてこれまで第１にゾル−ゲ
ル法、共沈法、加水分解法、熱分解法、噴霧熱分解法、
水熱合成法などが知られている。これらの方法で生成し
たムライトは、高純度であるか、非常に高価なムライト
材料となる。したかってファインセラミックス材料とし
て使われる。すなわち、エレクトロニクスセラミックス
材料及び高温構造材料として使われる。So far, the primary methods for synthesizing Daiemurai I have been the sol-gel method, coprecipitation method, hydrolysis method, pyrolysis method, spray pyrolysis method,
Hydrothermal synthesis methods are known. The mullite produced by these methods is either highly pure or becomes a very expensive mullite material. Therefore, it is used as a fine ceramic material. That is, it is used as an electronic ceramic material and a high-temperature structural material.
また第２に天然のカオリンとアルミナとの固体反応によ
るムライトが製造市販されている。この方法で生成した
ムライトは第１の方法で生成したムライトよりは不純物
（Ｆｅ２０ｊ、ＭｇＯ１ＣａＯ、アルカリ類等）か若干
含入するため、若干機能か劣る。したかって用途は高温
用磁気材料、高温用耐火物、及び硬質磁気材料として用
いられる。Secondly, mullite is manufactured and commercially available by solid reaction of natural kaolin and alumina. The mullite produced by this method contains some impurities (Fe20j, MgO1CaO, alkalis, etc.) than the mullite produced by the first method, and therefore is slightly inferior in functionality. Therefore, it is used as a high-temperature magnetic material, a high-temperature refractory, and a hard magnetic material.
（発明が解決しようとする課題）
しかしながら上記のゾル−ゲル法、共沈法、加水分解法
、熱分解法、噴霧熱分解法又は水熱合成法ては、■）出
発原料が高価である、２）合成法が複雑て手間かかかり
、また反応時間か長く生産性が悪い、等の問題かあり、
その結果これらの方法て生成したムライトは非常に高価
なものになっていた。またカオリンとアルミナとの固体
反応によるムライトは、反応性が悪いので高温（１８０
０〜１８５０℃）て焼成し製品化している。この方法も
高温焼成のため燃料費かかさみ高価なムライトとなって
いた。また、粘土鉱物原料中で最も高価な原料であるカ
オリンを使用するので第１の方法て生成されたムライト
よりは若干安いかそれでも現在１トンｌＯ万円以上で販
売されている。(Problems to be Solved by the Invention) However, the above-mentioned sol-gel method, coprecipitation method, hydrolysis method, pyrolysis method, spray pyrolysis method, or hydrothermal synthesis method has two problems: ■) The starting materials are expensive; 2) The synthesis method is complicated and time-consuming, and the reaction time is long and productivity is poor.
As a result, the mullite produced by these methods has become very expensive. In addition, mullite, which is produced by a solid reaction between kaolin and alumina, has poor reactivity, so high temperatures (180
0 to 1850°C) to produce products. This method also requires high-temperature firing, resulting in high fuel costs and expensive mullite. In addition, since kaolin, which is the most expensive raw material among clay mineral raw materials, is used, it is slightly cheaper than mullite produced by the first method, but it is currently sold for more than 1 ton, 10,000 yen.
（課題を解決するための手段）
本発明者らはこのような従来の人工ムライトの製造方法
、特に固体反応によるムライトの製造方法の欠点を克服
するため鋭意研究を重ねた結果、石炭灰は火力発Ｔｉ所
ボイラーの１５００〜１６００℃火炎中で生成され、鉱
物組成としては石英か主鉱物であるか、ボーｒラー高温
中に石炭灰中のシリカとアルミナ成分か反応し、若干の
ムライトが生成される。その含有♀−は数％である。ま
た石炭灰中には非晶質のシリカの存在が認められること
、したがって石炭灰にアルミナを加えて混合−焼成すれ
ば、非晶質のシリカとアルミナの固体反応による新たな
ムライト質の生成か可能であることを見出した。(Means for Solving the Problems) The present inventors have conducted intensive research to overcome the drawbacks of the conventional method for producing artificial mullite, especially the method for producing mullite by solid reaction. It is produced in the 1500-1600°C flame of a Ti plant boiler, and the mineral composition is either quartz or the main mineral, or the silica and alumina components in the coal ash react during the high temperature of the borer, producing some mullite. be done. The content of ♀- is several percent. In addition, the presence of amorphous silica is recognized in coal ash. Therefore, if alumina is added to coal ash and mixed and fired, a new mullite will be generated due to a solid reaction between amorphous silica and alumina. I found out that it is possible.
そして、この際石炭灰中に含まれるアルカリ金属又はア
ルカリ土類金属がムライト生成促進剤（焼結補助剤）と
して寄与することから、従来の焼成温度よりも３００〜
５００℃も低い温度（１３００〜１５００℃）でムライ
トを製造できることを見出し、これらの知見に基づいて
本発明を完成するに至った。At this time, the alkali metal or alkaline earth metal contained in the coal ash contributes as a mullite formation accelerator (sintering aid), so the firing temperature is 300 - 300 m
It was discovered that mullite can be produced at a temperature as low as 500°C (1300 to 1500°C), and the present invention was completed based on these findings.
すなわち本発明は、脱鉄及び脱炭素した石炭灰にアルミ
ナを加えこの混合物を生成、焼成することを特徴とする
ムライト系材料の製造方法を提供するものである。That is, the present invention provides a method for producing a mullite-based material, which is characterized by adding alumina to deironated and decarbonized coal ash to produce and sinter the mixture.
本発明に用いられる石炭灰は好ましくは、５ｉ０２ ５
５ｗｔ％以上、Ａ文２０３ ２０ｗｊ％以−１−を含有
するものである。これは前処理により、好ましくは鉄分
２ｗｔ％以下、炭素分０．５ｗｔ％以下とされる。The coal ash used in the present invention is preferably 5i02 5
It contains 5 wt% or more and A-text 203 20 wj% or more -1-. Preferably, the iron content is 2 wt% or less and the carbon content is 0.5 wt% or less by pretreatment.
本発明に使用する石炭灰は、所定量のＴｉＯ２、ＣａＯ
ｌＭｇＯ，に２０、Ｎａ２Ｏ等を含有していてもよい。The coal ash used in the present invention contains a predetermined amount of TiO2, CaO
1MgO, 20, Na2O, etc. may be contained.
本発明において前処理としては脱鉄、脱炭素。In the present invention, pretreatment includes deironization and decarbonization.
酸処理及び微粉砕等が挙げられる。脱鉄処理はまず磁選
機による脱鉄の後、必要に応じてさらに塩酸、硫酸等で
酸洗いして行う。脱炭素は石炭灰の残存炭素分（未然石
炭分）を減する目的で行い、脱鉄後８００〜９００″Ｃ
で仮焼し脱炭素灰にすることにより行われる。Examples include acid treatment and pulverization. The iron removal treatment is carried out by first removing iron using a magnetic separator, and then, if necessary, by pickling with hydrochloric acid, sulfuric acid, etc. Decarbonization is performed for the purpose of reducing the residual carbon content (unprocessed coal content) of coal ash.
This is done by calcining it into decarbonized ash.
以ｊ−のボｊ処理か不十分では後工程で形成される成形
体は焼成中に発泡性か生じる。また残存鉄分の為、有色
（赤褐色）を呈し、商品価値が劣るものしか得られない
。If the following treatment is insufficient, the molded product formed in the subsequent process will have foaming properties during firing. Also, due to the residual iron content, it is colored (reddish brown) and can only be obtained with inferior commercial value.
また本発明に使用するアルミナとしては水酸化アルミニ
ウム、γ型アルミナ又はα型アルミナ等を挙げることか
てきる。アルミナのその粒径は特に制限はないか経済性
から数ミクロンからｌ１０７ｔとするのか好ましい。こ
のアルミナの石炭灰への配合比は特に限定するものでは
ないが、ムライトの５ｉＯｚとＡ１２０：ｌの成分ｗｔ
％は、Ｓ ｉ ０２ ２８ 、２ｗＬ％、Ａ文、０．
７１．８ｗｔ％である。従って石炭灰中の５ｉｎ２の量
に対し、理論配合比にするのが最も好ましいか、アルミ
ナが高価な原料である故、経済性を考慮に入れ、２：１
〜１：１の範囲の配合比が好ましい。Further, examples of the alumina used in the present invention include aluminum hydroxide, γ-type alumina, α-type alumina, and the like. There is no particular restriction on the particle size of alumina, but it is preferably from several microns to 1107t from economical considerations. The blending ratio of this alumina to the coal ash is not particularly limited, but the composition wt of 5iOz of mullite and A120:l
% is S i 02 28 , 2wL%, A sentence, 0.
It is 71.8wt%. Therefore, for the amount of 5 in2 in coal ash, it is most preferable to use the theoretical mixing ratio, or since alumina is an expensive raw material, taking economic efficiency into consideration, it is 2:1.
A blending ratio in the range of 1:1 is preferred.
より好ましくは、１：１（炭種Ａの前処理灰の場合Ｓ
１０２ ３５ 、５ｗｔ％：ＡｌｔＯ：ｓ６４．６ｗｔ
％となる）かよい。こうして得られた混合物は微粉体は
ど反応性はよいか、経済性の点から数ミクロンから１０
ミクロン程度に微粉砕するのか好ましい。More preferably, 1:1 (S for pretreated ash of coal type A)
102 35, 5wt%: AltO:s64.6wt
%). The reactivity of the thus obtained mixture is determined from a few microns to 10 microns from an economic point of view.
It is preferable to grind it to a micron size.
この混合物微粉体の成形は形、大きさ等は制限はないが
成形に必要な圧力は５００〜１２００トン／ｃｍ”か好
ましく、より好ましくは１トン／ｃｒｎ’とする。成形
体の焼成は焼成時間８〜１５時間が好ましいか、より好
ましくは１０時間である。焼成温度は１３００〜１６０
０℃が好ましいか、より好ましい温度は１４００〜１５
００℃である。焼成保持時間は２〜５時間か好ましいか
通常２時間で十分である。焼成体冷却後は、粗砕あるい
は微粉砕にしてムライト系材料とする。The molding of this fine powder mixture is not limited to any shape or size, but the pressure required for molding is preferably 500 to 1,200 tons/cm', more preferably 1 ton/crn'. The time is preferably 8 to 15 hours, more preferably 10 hours.The firing temperature is 1300 to 160
Preferably 0°C, more preferably 1400-15
It is 00℃. The firing holding time is preferably 2 to 5 hours, and usually 2 hours is sufficient. After the fired body is cooled, it is crushed coarsely or finely to obtain a mullite-based material.
（実施例） 以下実施例に基づいて本発明をさらに詳細に説明する。(Example) The present invention will be explained in more detail below based on Examples.
実施例１
第１表に後述する実施例２に使用する石炭灰Ｂ種ととも
に本発明て使用する石炭灰Ａ種の組成を示す。この石炭
灰Ａ種を厳選機にかけ、磁力１万５千〜２万ガウスて脱
鉄した。次いで脱鉄法を電気炉を用い、温度８００℃、
保持時間２時間で脱炭素した。Example 1 Table 1 shows the composition of coal ash type A used in the present invention as well as coal ash type B used in Example 2, which will be described later. This type A coal ash was passed through a carefully selected machine to remove iron using a magnetic force of 15,000 to 20,000 Gauss. Next, the iron removal method was carried out using an electric furnace at a temperature of 800°C.
Decarbonization was achieved with a holding time of 2 hours.
脱炭素灰は微粉砕機で微粉末法にした（平均粒径７〜８
ミクロン）。次に脱鉄−説炭素一微粉砕した石炭灰１０
０ｇを用い、温水洗い（温水１文、温度８０°Ｃ″′ｃ
Ｗｌ拌しながら）さらに酸洗い（ｅ度２規定の塩酸ｌ２
中で、温度８０°Ｃ，時間２時間攪拌しながら洗浄）、
ろ過後、乾燥して＋ｆｉｊ処理は終了する。The decarbonized ash was made into a fine powder using a pulverizer (average particle size 7-8
micron). Next, iron removal theory: carbon 10 finely pulverized coal ash
Using 0g, wash with warm water (1 sentence of warm water, temperature 80°C'''c)
(while stirring) and pickling (with 2N hydrochloric acid l2
Washing at 80°C for 2 hours with stirring)
After filtration, the +fij treatment is completed by drying.
次に前処理灰５０ｇに水酸化アルミニウム、γ型アルミ
ナ又はα型アルミナ５０ｇを加えてよく混合し、水分１
０ｗｔ％を加えて、成形圧１トン／ｃｍ’の圧で直１１
１６ｍｍ、長さ１４〜１６ｍｍの円柱状の成形体を成形
した。この成形体を電気炉を用いて昇温速度１５０℃／
時間、焼成温度１５００℃、保持時間２時間て焼成しム
ライトを生成した。Next, add 50 g of aluminum hydroxide, γ-type alumina, or α-type alumina to 50 g of pretreated ash, mix well, and
Add 0 wt% and directly press 11 at a molding pressure of 1 ton/cm'.
A cylindrical molded body having a diameter of 16 mm and a length of 14 to 16 mm was molded. This molded body was heated at a heating rate of 150°C/
Mullite was produced by firing at a firing temperature of 1500° C. and a holding time of 2 hours.
上記方法により得られたムライトの性状を第２表に示す
。またそれぞれのＸ線回折図を第１図（ａ）、（ｂ）、
（ｃ）及び（ｄ）に示す。Table 2 shows the properties of the mullite obtained by the above method. In addition, the respective X-ray diffraction patterns are shown in Figure 1 (a), (b),
Shown in (c) and (d).
実施例２
第１表に示す石炭灰Ｂ種を磁選機にかけ実施例１と同様
に脱鉄、脱炭素し、微粉砕した。石炭灰Ｂ種は同表に示
すように元から鉄分か少ない灰であるので、石炭灰Ａ種
のように温水洗い、酸洗いはしなくてもよい。磁選脱鉄
−説炭素一徹粉砕１ノたＢ灰５０ｇにγ型アルミナ５０
ｇを加え、よく混合した後実施例１と同様に成形−焼成
し、ムライトを生成した。Example 2 Type B coal ash shown in Table 1 was subjected to a magnetic separator to remove iron, decarbonize, and pulverize in the same manner as in Example 1. As shown in the same table, type B coal ash is originally ash with low iron content, so unlike type A coal ash, it does not need to be washed with warm water or pickled. Magnetic Separation - De-ironization - Theory of carbon pulverization 50 g of B ash and 50 g of γ-type alumina
After mixing well, molding and firing were carried out in the same manner as in Example 1 to produce mullite.
Ｉ；記方法により得られたムライトの性状を前記実施例
１と同様に第２表に示す。また第１図（ｄ）にそのＸ線
回折図を示す。The properties of the mullite obtained by the method described above are shown in Table 2 as in Example 1 above. Moreover, the X-ray diffraction pattern is shown in FIG. 1(d).
第２表の本発明ムライトと市販品ムライｌ−（カオリン
−水酸化アルミニウム）の物性比較で示すように、はと
んど差がない。特に圧装引張り強度ては第２表て見られ
るように本発明品か市販品よりも優れている。As shown in Table 2, which compares the physical properties of the mullite of the present invention and the commercially available mullite (kaolin-aluminum hydroxide), there is almost no difference between them. In particular, as shown in Table 2, the compressed tensile strength is superior to the products of the present invention and commercially available products.
また第１図のＸ線回折図で示すように、ムライト結晶の
生成は市販品第１図（ｅ）（カオリン−水酸化アルミニ
ウム）と同格である。Furthermore, as shown in the X-ray diffraction diagram of FIG. 1, the formation of mullite crystals is on the same level as the commercial product shown in FIG. 1(e) (kaolin-aluminum hydroxide).
（発明の効果）
以上説明したように本発明方法によれば低コストでムラ
イト質セラミックス原料を製造することがてきる。すな
わち、従来の固体反応方法により得られた市販品ムライ
トよりも、石炭灰の磁選−仮焼一微粉砕一酸洗いの前処
理を含めても２０〜３０％は安く製造できる。また、鉄
分の少ない石炭灰を原料とした場合は酸洗いは必要とし
ないのでさらに安く、１／２程度で製造できる。従って
本発明は固体反応方法に比べて、非常に経済性に富む。(Effects of the Invention) As explained above, according to the method of the present invention, a mullite ceramic raw material can be produced at low cost. That is, it can be produced 20 to 30% cheaper than commercially available mullite obtained by conventional solid reaction methods, even including the pretreatment of magnetic separation, calcination, pulverization, and pickling of coal ash. In addition, if coal ash with a low iron content is used as a raw material, pickling is not necessary, so it is even cheaper and can be produced at about 1/2 the cost. Therefore, the present invention is much more economical than solid reaction methods.
さらに生成したムライトの性状も従来品と同等かもしく
はそれ以上である。Furthermore, the properties of the produced mullite are equal to or better than those of conventional products.
第１図（ａ）、（ｂ）、（ｃ）及び（ｄ）は第１表及び
第２表に示す実施例のムライト質セラミックス原料のＸ
線回折図、第１図（ｅ）は従来例のムライト質セラミッ
クス原料のＸ線回折図である。Figure 1 (a), (b), (c) and (d) show the X of the mullite ceramic raw materials of the examples shown in Tables 1 and 2
Figure 1(e) is an X-ray diffraction diagram of a conventional mullite ceramic raw material.
Claims (1)
合物を成形、焼成することを特徴とするムライト系材料
の製造方法。A method for producing a mullite-based material, which comprises adding alumina to deironated and decarbonized coal ash, shaping and firing the mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1091622A JPH0774096B2 (en) | 1989-04-11 | 1989-04-11 | Method for manufacturing mullite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1091622A JPH0774096B2 (en) | 1989-04-11 | 1989-04-11 | Method for manufacturing mullite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02275752A true JPH02275752A (en) | 1990-11-09 |
| JPH0774096B2 JPH0774096B2 (en) | 1995-08-09 |
Family
ID=14031666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1091622A Expired - Lifetime JPH0774096B2 (en) | 1989-04-11 | 1989-04-11 | Method for manufacturing mullite material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0774096B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007186910A (en) * | 2006-01-13 | 2007-07-26 | Japan Fine Ceramics Center | Ceramic sintered body, ballast, and ballast track bed |
| JP2020039994A (en) * | 2018-09-06 | 2020-03-19 | 昭和電工株式会社 | Method of processing incineration ash, and method of reusing the same |
| CN114907097A (en) * | 2022-02-28 | 2022-08-16 | 内蒙古佳汇新材料科技有限公司 | Method for producing mullite inert alumina ceramic ball |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5147009A (en) * | 1974-10-19 | 1976-04-22 | Kogyo Gijutsuin |
-
1989
- 1989-04-11 JP JP1091622A patent/JPH0774096B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5147009A (en) * | 1974-10-19 | 1976-04-22 | Kogyo Gijutsuin |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007186910A (en) * | 2006-01-13 | 2007-07-26 | Japan Fine Ceramics Center | Ceramic sintered body, ballast, and ballast track bed |
| JP2020039994A (en) * | 2018-09-06 | 2020-03-19 | 昭和電工株式会社 | Method of processing incineration ash, and method of reusing the same |
| CN114907097A (en) * | 2022-02-28 | 2022-08-16 | 内蒙古佳汇新材料科技有限公司 | Method for producing mullite inert alumina ceramic ball |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0774096B2 (en) | 1995-08-09 |
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