JPH085698B2 - Method for manufacturing inorganic plate - Google Patents
Method for manufacturing inorganic plateInfo
- Publication number
- JPH085698B2 JPH085698B2 JP1789887A JP1789887A JPH085698B2 JP H085698 B2 JPH085698 B2 JP H085698B2 JP 1789887 A JP1789887 A JP 1789887A JP 1789887 A JP1789887 A JP 1789887A JP H085698 B2 JPH085698 B2 JP H085698B2
- Authority
- JP
- Japan
- Prior art keywords
- fluidized bed
- magnesium hydroxide
- ash
- inorganic plate
- combustion
- 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.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は無機質板の製造方法に関し、詳しくは流動
床燃焼炉で生じる燃焼灰を用いた無機質板の製造方法に
関する。TECHNICAL FIELD The present invention relates to a method for producing an inorganic plate, and more particularly to a method for producing an inorganic plate using combustion ash produced in a fluidized bed combustion furnace.
従来、微粉炭燃焼ボイラーの廃ガス中に含まれる灰の
微粉粒子であるフライアッシュをセメント代換物とし、
無機質板材を製造する手段が種々開示されている（例え
ば特公昭59−92956号公報、同59−92957号公報）。Conventionally, fly ash, which is fine powder particles of ash contained in the waste gas of a pulverized coal combustion boiler, is used as a cement substitute.
Various means for producing an inorganic plate material have been disclosed (for example, Japanese Patent Publication Nos. 59-92956 and 59-92957).
ところで、燃焼炉として、上述のような高温燃焼炉の
他に、流動床燃焼炉が知られている。By the way, as a combustion furnace, a fluidized bed combustion furnace is known in addition to the above-described high temperature combustion furnace.
この流動燃焼炉は、従来の微粉炭燃焼方式と異なり、
粉炭を石灰石やシリカ粒子などの流動媒体と共に流動状
態で燃焼させる方式で（1984年日本化学会「化学と工
業」第37巻12号参照）燃焼温度が750゜〜950℃と極端に
低いためNOxの発生量が著しく減少するばかりでなく石
灰石の添加によって同時脱硫できる長所を持ち、さら
に、燃焼の効率化、炉の小型化低品位炭の使用などの利
点が数多く、広範に普及しつつある。This fluid combustion furnace is different from the conventional pulverized coal combustion method.
A method of burning pulverized coal in a fluid state with a fluid medium such as limestone or silica particles (see Chemical Society of Japan, "Chemistry and Industry" Vol. 37, No. 12, 1984) NOx because the combustion temperature is extremely low from 750 ° to 950 ° C. It has the advantage of not only significantly reducing the amount of carbon dioxide generated, but also being able to simultaneously desulfurize it by adding limestone. Furthermore, it has many advantages such as efficient combustion, downsizing of the furnace and the use of low-grade coal.
しかし、上記流動床燃焼炉から排出される燃焼廃は、
従来のフライアッシュと表１に示すように主成分は、ほ
ぼ一致するもののフライアッシュに含まれたい成分又
は、少ない成分を比較的大量に含むため、従来のフライ
アッシュと同列視することは問題である。However, the combustion waste discharged from the fluidized bed combustion furnace is
As shown in Table 1 with the conventional fly ash, the main components are almost the same, but the components that the fly ash wants to contain or the components that do not contain relatively large amounts are included, so it is not a problem to compare them with the conventional fly ash. is there.
一方、流動床燃焼炉の普及と共に燃焼灰の廃棄量も増
加の一途をたどるため、その有効利用を早急に図る必要
が有る。On the other hand, with the spread of fluidized bed combustion furnaces, the amount of combustion ash discarded will continue to increase, so it is necessary to promptly make effective use of it.
〔発明が解決する問題点〕 この発明は上記問題点に鑑み、流動床燃焼炉より生じ
る燃焼灰の有効利用、とりわけ、無機質板材の製造原料
として有効利用出来る無機質板の製造方法を得ることを
目的としてなされたものである。 [Problems to be solved by the invention] In view of the above problems, the present invention aims to obtain an effective use of combustion ash generated from a fluidized bed combustion furnace, and particularly to obtain a method for producing an inorganic plate that can be effectively used as a raw material for producing an inorganic plate material. It was made as.
即ち、この発明の無機質板の製造方法は、セメント又
は消石灰の少なくとも何れかと流動床燃焼灰とから成る
水和反応材料に水酸化マグネシウムを２〜20重量％と、
パルプ、石綿、パーライト等の添加材をそれぞれ所定量
添加して成る組成物を水の存在下で板状に成形し養生硬
化することを特徴とするものである。That is, the method for producing an inorganic plate of the present invention, 2 to 20% by weight of magnesium hydroxide in a hydration reaction material consisting of at least one of cement or slaked lime and fluidized bed combustion ash,
The present invention is characterized in that a composition obtained by adding a predetermined amount of an additive such as pulp, asbestos, perlite or the like is molded into a plate shape in the presence of water and cured by curing.
この発明において、流動床燃焼灰とは既述のように流
動床燃焼炉より大量に排出される燃焼灰が使用される。In the present invention, as the fluidized bed combustion ash, as described above, the combustion ash discharged from the fluidized bed combustion furnace in a large amount is used.
また、この発明において使用する水酸化マグネシウム
には、マグネサイト鉱滓、炭酸マグネシウム化合物を10
00℃前後又は、それ以下の温度で焼成した、主成分がMg
Oから成るものを使用できる。このものは水と反応してM
g（OH）２の形態で硬化反応系に寄与する。Further, the magnesium hydroxide used in the present invention includes a magnesite slag and a magnesium carbonate compound.
The main component is Mg, which is baked at a temperature of around 00 ℃ or lower.
Those consisting of O can be used. This thing reacts with water and M
It contributes to the curing reaction system in the form of g (OH) 2 .
さらに、水酸化マグネシウムの代りにMg（OH）2/CaCO
3の重量比が7/3〜3/7の水酸化マグネシウム−炭酸カル
シウムの混合物を用いることも出来る。Furthermore, instead of magnesium hydroxide, Mg (OH) 2 / CaCO
It is also possible to use a mixture of magnesium hydroxide-calcium carbonate with a weight ratio of 3 of 7/3 to 3/7.
この水酸化マグネシウム−炭酸カルシウム化合物は、
海水から水酸化マグネシウムを製造する過程で、海水中
の炭酸イオンを石灰乳で不溶性の炭酸カルシウムにして
除去する時、過剰の石灰乳とMgCl2との反応によって得
られる。This magnesium hydroxide-calcium carbonate compound is
In the process of producing magnesium hydroxide from seawater, when carbonate ions in seawater are removed with lime milk to form insoluble calcium carbonate, it is obtained by the reaction between excess lime milk and MgCl 2 .
上記化合物は、水酸化マグネシウムの低コスト化を図
ることが出来、都合が良い。The above compound is convenient because it can reduce the cost of magnesium hydroxide.
なお、Mg（OH）2/CaCO3の重量比が3/7〜7/3とする理
由は3/7以下では後述のようにハイドロガーネットの生
成抑止効果が乏しく、かつCaCO3量増大による硬化体の
強度低下が顕著となり7/3以上では水酸化マグネシウム
の添加によりコストが著しく向上する反面、添加による
強化効果が得られないか、逆に低下する場合が有るから
である。The reason for setting the weight ratio of Mg (OH) 2 / CaCO 3 to 3/7 to 7/3 is that if it is 3/7 or less, the effect of suppressing the formation of hydrogarnet is poor as described below, and hardening due to an increase in the amount of CaCO 3 This is because the strength of the body is remarkably reduced, and when it is 7/3 or more, the cost is remarkably improved by the addition of magnesium hydroxide, but on the other hand, the strengthening effect due to the addition may not be obtained or may be reduced.
流動床燃焼炉よりの燃焼灰（以下流動床灰と言う）
は、Al2O3をフライアッシュと同様大量に含有しており
（20％前後）その余剰アルミナのため、流動床灰を多量
に使用した配合系を用い、成形後オートクレイブ養生を
行うとハイドロガーネットが生成すると考えられる。Combustion ash from a fluidized bed combustion furnace (hereinafter referred to as fluidized bed ash)
Contains a large amount of Al 2 O 3 like fly ash (around 20%), and due to the surplus alumina, a compounding system using a large amount of fluidized bed ash was used, and if autoclave curing was performed after molding, It is considered that garnet is generated.
このハイドロガーネットは粗大な低強度の結晶である
ため、上記硬化体の膨張破壊や硬化不良を招来し、強度
低下を余儀なくされる。Since this hydrogarnet is a coarse and low-strength crystal, it causes expansion failure and curing failure of the above-mentioned cured product, and the strength is inevitably reduced.
そこで、本発明において、上記配合系に水酸化マグネ
シウムを配合したところ、圧力10kg/cm2以上の高温高圧
水蒸気による水熱反応を生じさせた場合及び、これより
さらに低圧の水蒸気圧における蒸気養生でも著しく曲げ
強度の向上が図られることが判明した。Therefore, in the present invention, when magnesium hydroxide is blended in the above blending system, when a hydrothermal reaction is caused by high-temperature high-pressure steam having a pressure of 10 kg / cm 2 or more, and even in steam curing at a steam pressure of lower pressure than this. It was found that the bending strength was remarkably improved.
この強度発現の原因は定かではないが、Mg（OH）２が
ハイドロガーネット生成の抑止剤として作用しているも
のと考えられる。The cause of this strength development is not clear, but it is considered that Mg (OH) 2 acts as an inhibitor of hydrogarnet formation.
なお、上記水酸化マグネシウムの添加量は、組成物に
対し、２〜15重量％が好適であり、２重量％より少ない
と充分な強度向上が得られず、また15重量％より多い
と、かえって強度が低下する傾向が見られる。The amount of magnesium hydroxide added is preferably from 2 to 15% by weight based on the composition. If the amount is less than 2% by weight, sufficient strength cannot be obtained. The strength tends to decrease.
また、水酸化マグネシウムとしてMg（OH）2/CaCO3を
用いた場合は該化合物中のMg（OH）２の含量に着目し、
Mg（OH）2/CaCO3の添加量が２〜30重量％とされる。When Mg (OH) 2 / CaCO 3 is used as magnesium hydroxide, pay attention to the content of Mg (OH) 2 in the compound,
The amount of Mg (OH) 2 / CaCO 3 added is 2 to 30% by weight.
次にこの発明の実施例を説明する。 Next, an embodiment of the present invention will be described.
前述の表１に利召した化学組成の流動床灰を表２に示
す配合とし、水と混練した後厚さ5mm、長さ1m、幅45cm
の試験板を成形し、オートクレーブで養生後、これらの
曲げ強度（kg/cm2）、吸水率及び絶乾比重を測定したと
ころ、表２下欄に示す結果が得られた。The fluidized bed ash having the chemical composition used in Table 1 was blended as shown in Table 2, and after kneading with water, thickness 5 mm, length 1 m, width 45 cm.
The test plate of No. 2 was molded, and after curing in an autoclave, the bending strength (kg / cm 2 ), water absorption rate and absolute dry specific gravity thereof were measured, and the results shown in the lower column of Table 2 were obtained.
また、水酸化マグネシウムの添加量と曲げ強度との相
関をグラフで示すと第１図のようになり、水酸化マグネ
シウムの添加量を２〜15重量％とすることが好適である
ことが判明した。Further, the correlation between the added amount of magnesium hydroxide and the bending strength is shown in a graph as shown in FIG. 1, and it has been proved that the added amount of magnesium hydroxide is preferably 2 to 15% by weight. .
この発明は以上説明したように、フライアッシュに換
え流動床灰を用いても充分な強度を有する板材が製造可
能となり、流動床灰の有効利用が可能となるのである。As described above, according to the present invention, a plate material having sufficient strength can be produced even if fluidized bed ash is used instead of fly ash, and the fluidized bed ash can be effectively used.
第１図はこの発明の方法により得た無機質板材の強度試
験結果を示すグラフである。FIG. 1 is a graph showing the strength test results of the inorganic plate material obtained by the method of the present invention.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 22:06 Ａ 14:18 14:40 24:38） ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location C04B 22:06 A 14:18 14:40 24:38)
Claims (1)
流動床燃焼灰とから成る水和反応材料に水酸化マグネシ
ウムを２〜20重量％と、パルプ、石綿、パーライト等の
添加材をそれぞれ所定量添加して成る組成物を水の存在
下で板状に成形し養生硬化することを特徴とする無機質
板の製造方法。1. A hydration reaction material comprising at least one of cement and slaked lime and a fluidized bed combustion ash, to which 2 to 20% by weight of magnesium hydroxide and a predetermined amount of additives such as pulp, asbestos and perlite are added. A method for producing an inorganic plate, which comprises molding the composition formed into a plate shape in the presence of water and curing and curing the composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1789887A JPH085698B2 (en) | 1987-01-28 | 1987-01-28 | Method for manufacturing inorganic plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1789887A JPH085698B2 (en) | 1987-01-28 | 1987-01-28 | Method for manufacturing inorganic plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63185848A JPS63185848A (en) | 1988-08-01 |
| JPH085698B2 true JPH085698B2 (en) | 1996-01-24 |
Family
ID=11956552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1789887A Expired - Fee Related JPH085698B2 (en) | 1987-01-28 | 1987-01-28 | Method for manufacturing inorganic plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH085698B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2521562B2 (en) * | 1990-06-06 | 1996-08-07 | 株式会社クボタ | Method for manufacturing inorganic plate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6140620B2 (en) | 2014-01-28 | 2017-05-31 | 高橋金属株式会社 | Press machine |
-
1987
- 1987-01-28 JP JP1789887A patent/JPH085698B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6140620B2 (en) | 2014-01-28 | 2017-05-31 | 高橋金属株式会社 | Press machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63185848A (en) | 1988-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |