JP3663808B2 - Coal ash sand and method for producing the same - Google Patents
Coal ash sand and method for producing the same Download PDFInfo
- Publication number
- JP3663808B2 JP3663808B2 JP3363997A JP3363997A JP3663808B2 JP 3663808 B2 JP3663808 B2 JP 3663808B2 JP 3363997 A JP3363997 A JP 3363997A JP 3363997 A JP3363997 A JP 3363997A JP 3663808 B2 JP3663808 B2 JP 3663808B2
- Authority
- JP
- Japan
- Prior art keywords
- coal ash
- weight
- cement
- parts
- inorganic powder
- 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 - Lifetime
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Description
【０００１】
【発明の属する技術分野】
本発明は、土木材料、建築材料等として利用できる石炭灰砂及びその製造方法に関するものである。
【０００２】
【従来の技術】
従来、石炭火力発電所から大量に発生する石炭灰を有効利用するために、建築材料等として使用される砂を石炭灰を原料として人工的に製造する方法が提案されている。
例えば、特開昭６１−１５１０５２号公報には、石炭灰にセメント及び水を加え、高速混合造粒して石炭灰砂を製造する方法が開示されている。
同様に、特開昭６３−２０１０４５号公報には、フライアッシュとスラグ粉末にセメント及び水を加え、高速混合造粒して石炭灰砂を製造する方法が開示されている。
また、特開平３−２７５１３４号公報には、石炭灰にセメントと集塵ダスト及び水を加えて造粒して土木材料等とする方法が開示されている。
しかしながら、上記の方法で用いられる石炭灰、セメント、スラグ、集塵ダストの粉末度はほぼ同等であり、いずれも粒子径は数μｍ〜１０μｍ程度であることから、これらの粒子間を補完する微粒子群が少ないため、付着力が小さく、造粒しにくいという問題があり、しかも得られる砂の造粒強度が小さく、表面もざらざらしているという欠点があった。
【０００３】
【発明が解決しようとする課題】
本発明の目的は、石炭灰及びセメントの粒子間に平均粒子径が０．５μｍ以下である無機質微粒子を充填することにより、造粒粒子の強度が高く、かつ球状で良好な石炭灰砂を提供することにある。
【０００４】
【課題を解決するための手段】
本発明は、石炭灰、セメント及び平均粒子径が０．５μｍ以下である無機質微粒子から構成されてなることを特徴とする石炭灰砂に関するものである。
また、本発明は、石炭灰及びセメントに、ＢＥＴ比表面積が５ｍ2 ／ｇ以上である無機質粉体のスラリーを添加混合した後、高速攪拌造粒することを特徴とする石炭灰砂の製造方法に関するものである。
【０００５】
本発明の石炭灰砂は、石炭灰、セメント及び平均粒子径が０．５μｍ以下である無機質微粒子から構成されてなる。
各構成成分の割合は、６０〜９０重量部、好ましくは、６０〜８５重量部、セメント２〜２５重量部、好ましくは、５〜２０重量部、及び無機質微粒子５〜３５重量部、好ましくは、１０〜３０重量部であることが望ましい。
【０００６】
石炭灰が６０重量部よりも少ないと、石炭灰の有効利用量が減少するので好ましくない。また、９０重量部よりも多くなると、得られる石炭灰砂の強度が小さくなるため好ましくない。
セメントが２重量部よりも少ないと、得られる石炭灰砂の強度が小さくなるため好ましくない。また、２５重量部よりも多くなると、石炭灰砂の製造コストが高くなるので好ましくない。
【０００７】
無機質微粒子が５重量部よりも少ないと、石炭灰とセメントの粒子間の間隙を十分充填することができなくなるので好ましくない。また、３５重量部よりも多くなると石炭灰とセメントの粒子間の間隙からはみ出してかえって強度が低下する原因となるので好ましくない。
無機質微粒子の平均粒子径は０．５μｍ以下、好ましくは、０．１μｍ以下である。平均粒子径が０．５μｍよりも大きくなると、石炭灰及びセメントの粒子と同等の大きさとなり、これら粒子間の間隙を充填することができなくなるので好ましくない。
無機質微粒子としては、工場排水処理後の残さ、天然の粘土等が挙げられる。
【０００８】
本発明の石炭灰は、石炭灰及びセメントに、ＢＥＴ比表面積が５ｍ2 ／ｇ以上である無機質粉体のスラリーを添加混合した後、高速攪拌造粒することにより得られる。
各成分の配合割合は、石炭灰６０〜９０重量部、好ましくは、６０〜８５重量部、セメント２〜２５重量部、好ましくは、５〜２０重量部、及び無機質粉体５〜３５重量部、好ましくは、１０〜３０重量部であることが望ましい。
無機質粉体のＢＥＴ比表面積は、５ｍ2 ／ｇ以上、好ましくは、１０ｍ2 ／ｇ以上である。ＢＥＴ比表面積が５ｍ2 ／ｇよりも小さくなると、石炭灰及びセメントの粒子と同等の大きさとなり、これら粒子間の間隙を充填することができなくなるので好ましくない。
【０００９】
また、本発明においては、無機質粉体のスラリーは、０．１〜１ｍｍの範囲の二次粒子を含有することが望ましい。これらの二次粒子は、造粒核となって造粒を促進させることができる。
０．１〜１ｍｍの範囲の二次粒子の割合は、１〜１０重量％であることが好ましい。二次粒子の割合が、１重量％よりも少ないと、造粒を促進する効果がなく、また、１０重量％よりも多くなると、石炭灰とセメントの粒子間の間隙を充填する無機質微粒子群が少なくなるので好ましくない。
【００１０】
高速攪拌造粒するための造粒機としては、アイリッヒ型やヘンシェル型等のバッチ方式のものや、ブレンダー型やピン型等の連続方式のものが用いられる。
造粒に用いる石炭灰、セメント及び無機質粉体に加えられる水分量は、それら粉体の粉末度などにより異なるが、全粉体量１００重量部に対して２５〜４０重量部が好ましい。
【００１１】
【発明の効果】
本発明の石炭灰砂は、粒子径０．５μｍ以下の無機質微粒子が、石炭灰及びセメントの粒子間に充填にされているので、造粒粒子の強度が高く、かつ球状で良好である。
また、本発明によれば、石炭灰砂を製造するに際し、無機質粉体のスラリーに、０．１〜１ｍｍの範囲の二次粒子を含有させることにより、これらの二次粒子が造粒核となって造粒を促進させることができる。
【００１２】
【実施例】
以下に実施例及び比較例を示す。
実施例１〜５
表１に記載の無機質粉体をステンレスボール（容積５ｌ）に移し、これにスラリー濃度が約５０％になるように水を加えた。
このボールをセメントモルタルミキサー（丸車製，Ｃ１３８Ａ型）にセットして低速（回転運動１４０ｒｐｍ、遊星運動６２ｒｐｍ）で１分間混合した。これに残りの水を加えて、高速（回転運動２８５ｒｐｍ、遊星運動１２５ｒｐｍ）で３分間混合した。この際の無機質粉体の０．１〜１ｍｍの範囲の二次粒子の割合は５重量％であった。
得られた無機質粉体スラリーに表１に記載の石炭灰及びセメントを加え、低速で２分間混練した。なお、石炭灰として微粉炭灰フライアッシュ、セメントとして普通セメントを用いた。
次いで、高速で混練して造粒状態を観察しながら造粒を行った。
得られた造粒物をバットに移し、室内に所定日数放置した後、水中浸漬試験と木屋式硬度計による造粒物の圧潰強さ試験を行った。結果を表１に示す。
【００１３】
実施例６
表１に記載の無機質粉体をステンレスボール（容積５ｌ）に移し、これにスラリー濃度が約５０％になるように水を加えた。
このボールをセメントモルタルミキサー（丸車製，Ｃ１３８Ａ型）にセットして低速（回転運動１４０ｒｐｍ、遊星運動６２ｒｐｍ）で１分間混合した。これに残りの水を加えて、高速（回転運動２８５ｒｐｍ、遊星運動１２５ｒｐｍ）で５分間混合した。この際の無機質粉体の０．１〜１ｍｍの範囲の二次粒子の割合は１重量％未満であった。
次いで、実施例１〜５と同様にして造粒物を製造した。結果を表１に示す。
【００１４】
比較例１〜２
表１に記載の石炭灰及びセメントに水を加え、セメントモルタルミキサー（丸車製，Ｃ１３８Ａ型）にセットして低速で２分間混練した。
次いで、高速で混練して造粒状態を観察しながら造粒を行った。
得られた造粒物をバットに移し、室内に所定日数放置した後、水中浸漬試験と木屋式硬度計による造粒物の圧潰強さ試験を行った。結果を表１に示す。
【００１５】
【表１】
BACKGROUND OF THE INVENTION
The present invention relates to coal ash sand that can be used as civil engineering materials, building materials, and the like, and a method for producing the same.
[0002]
[Prior art]
Conventionally, in order to effectively use a large amount of coal ash generated from a coal-fired power plant, a method for artificially producing sand used as a building material or the like using coal ash as a raw material has been proposed.
For example, Japanese Patent Application Laid-Open No. 61-155102 discloses a method for producing coal ash sand by adding cement and water to coal ash and mixing and granulating at high speed.
Similarly, Japanese Patent Laid-Open No. 63-201045 discloses a method for producing coal ash sand by adding cement and water to fly ash and slag powder and mixing at high speed.
Japanese Patent Laid-Open No. 3-275134 discloses a method of adding a cement, dust collection dust and water to coal ash and granulating it into a civil engineering material or the like.
However, the fineness of coal ash, cement, slag, and dust collection dust used in the above method is almost the same, and the particle size is about several μm to 10 μm. Since there are few groups, there is a problem that adhesion is small and granulation is difficult, and the granulation strength of the resulting sand is small and the surface is rough.
[0003]
[Problems to be solved by the invention]
The object of the present invention is to provide fine coal ash sand having high strength of granulated particles and spherical shape by filling inorganic fine particles having an average particle size of 0.5 μm or less between coal ash and cement particles. There is to do.
[0004]
[Means for Solving the Problems]
The present invention relates to coal ash sand comprising coal ash, cement, and inorganic fine particles having an average particle diameter of 0.5 μm or less.
The present invention also relates to a method for producing coal ash sand, comprising adding and mixing a slurry of an inorganic powder having a BET specific surface area of 5 m 2 / g or more to coal ash and cement, followed by high-speed stirring granulation. It is about.
[0005]
The coal ash sand of the present invention is composed of coal ash, cement, and inorganic fine particles having an average particle size of 0.5 μm or less.
The proportion of each constituent component is 60 to 90 parts by weight, preferably 60 to 85 parts by weight, cement 2 to 25 parts by weight, preferably 5 to 20 parts by weight, and inorganic fine particles 5 to 35 parts by weight, The amount is desirably 10 to 30 parts by weight.
[0006]
If the amount of coal ash is less than 60 parts by weight, the effective utilization amount of coal ash decreases, which is not preferable. Moreover, since the intensity | strength of coal ash sand obtained will become small when it exceeds 90 weight part, it is unpreferable.
When the amount of cement is less than 2 parts by weight, the strength of the obtained coal ash sand is reduced, which is not preferable. On the other hand, if it exceeds 25 parts by weight, the production cost of coal ash sand becomes high, which is not preferable.
[0007]
If the amount of the inorganic fine particles is less than 5 parts by weight, it is not preferable because the gap between the coal ash and cement particles cannot be sufficiently filled. On the other hand, if it exceeds 35 parts by weight, it is not preferable because it protrudes from the gaps between the coal ash and cement particles and decreases the strength.
The average particle size of the inorganic fine particles is 0.5 μm or less, preferably 0.1 μm or less. When the average particle diameter is larger than 0.5 μm, it is not preferable because it becomes the same size as the coal ash and cement particles, and the gap between these particles cannot be filled.
Examples of the inorganic fine particles include residues after factory wastewater treatment, natural clay, and the like.
[0008]
The coal ash of the present invention is obtained by adding and mixing a slurry of an inorganic powder having a BET specific surface area of 5 m 2 / g or more to coal ash and cement, followed by high-speed stirring granulation.
The blending ratio of each component is 60 to 90 parts by weight of coal ash, preferably 60 to 85 parts by weight, 2 to 25 parts by weight of cement, preferably 5 to 20 parts by weight, and 5 to 35 parts by weight of inorganic powder. Preferably, it is 10 to 30 parts by weight.
The BET specific surface area of the inorganic powder is 5 m 2 / g or more, preferably 10 m 2 / g or more. If the BET specific surface area is smaller than 5 m 2 / g, it becomes the same size as the particles of coal ash and cement, and it is not preferable because the gap between these particles cannot be filled.
[0009]
In the present invention, the inorganic powder slurry preferably contains secondary particles in the range of 0.1 to 1 mm. These secondary particles can be granulated nuclei and promote granulation.
The proportion of secondary particles in the range of 0.1 to 1 mm is preferably 1 to 10% by weight. When the proportion of secondary particles is less than 1% by weight, there is no effect of promoting granulation, and when the proportion is more than 10% by weight, a group of inorganic fine particles filling the gaps between coal ash and cement particles. Since it decreases, it is not preferable.
[0010]
As a granulator for performing high-speed agitation granulation, a batch system such as an Eirich type or a Henschel type, or a continuous type such as a blender type or a pin type is used.
The amount of water added to the coal ash, cement and inorganic powder used for granulation varies depending on the fineness of the powder, but is preferably 25 to 40 parts by weight with respect to 100 parts by weight of the total powder.
[0011]
【The invention's effect】
In the coal ash sand of the present invention, inorganic fine particles having a particle diameter of 0.5 μm or less are filled between the coal ash and cement particles, so that the strength of the granulated particles is high and the shape is good in a spherical shape.
In addition, according to the present invention, when producing coal ash sand, the secondary particles in the range of 0.1 to 1 mm are contained in the inorganic powder slurry so that these secondary particles and the granulated nuclei are contained. It is possible to promote granulation.
[0012]
【Example】
Examples and comparative examples are shown below.
Examples 1-5
The inorganic powder described in Table 1 was transferred to a stainless ball (volume: 5 l), and water was added thereto so that the slurry concentration was about 50%.
This ball was set in a cement mortar mixer (manufactured by Maruka, C138A type) and mixed at a low speed (rotational motion: 140 rpm, planetary motion: 62 rpm) for 1 minute. The remaining water was added to this and mixed for 3 minutes at high speed (rotational motion 285 rpm, planetary motion 125 rpm). At this time, the proportion of secondary particles in the range of 0.1 to 1 mm of the inorganic powder was 5% by weight.
Coal ash and cement shown in Table 1 were added to the resulting inorganic powder slurry, and kneaded at low speed for 2 minutes. In addition, pulverized coal ash fly ash was used as the coal ash, and ordinary cement was used as the cement.
Next, granulation was performed while kneading at high speed and observing the granulated state.
The obtained granulated product was transferred to a vat and left in the room for a predetermined number of days, and then subjected to an underwater immersion test and a crushing strength test of the granulated product using a Kiyama hardness tester. The results are shown in Table 1.
[0013]
Example 6
The inorganic powder described in Table 1 was transferred to a stainless ball (volume: 5 l), and water was added thereto so that the slurry concentration was about 50%.
This ball was set in a cement mortar mixer (manufactured by Maruka, C138A type) and mixed at a low speed (rotational motion: 140 rpm, planetary motion: 62 rpm) for 1 minute. The remaining water was added to this and mixed for 5 minutes at high speed (rotational motion 285 rpm, planetary motion 125 rpm). In this case, the proportion of secondary particles in the range of 0.1 to 1 mm of the inorganic powder was less than 1% by weight.
Subsequently, the granulated material was manufactured like Example 1-5. The results are shown in Table 1.
[0014]
Comparative Examples 1-2
Water was added to the coal ash and cement shown in Table 1, and the mixture was set in a cement mortar mixer (manufactured by Maruka, C138A type) and kneaded at low speed for 2 minutes.
Next, granulation was performed while kneading at high speed and observing the granulated state.
The obtained granulated product was transferred to a vat and left in the room for a predetermined number of days, and then subjected to an underwater immersion test and a crushing strength test of the granulated product using a Kiyama hardness tester. The results are shown in Table 1.
[0015]
[Table 1]
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3363997A JP3663808B2 (en) | 1997-02-18 | 1997-02-18 | Coal ash sand and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3363997A JP3663808B2 (en) | 1997-02-18 | 1997-02-18 | Coal ash sand and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10226548A JPH10226548A (en) | 1998-08-25 |
| JP3663808B2 true JP3663808B2 (en) | 2005-06-22 |
Family
ID=12392031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3363997A Expired - Lifetime JP3663808B2 (en) | 1997-02-18 | 1997-02-18 | Coal ash sand and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3663808B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3683789B2 (en) * | 2000-08-21 | 2005-08-17 | 太平洋セメント株式会社 | Coal ash treatment and logistics combined system |
| JP4965065B2 (en) * | 2003-11-17 | 2012-07-04 | 四国電力株式会社 | Method for producing ground material and method for reusing ground material obtained thereby |
-
1997
- 1997-02-18 JP JP3363997A patent/JP3663808B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10226548A (en) | 1998-08-25 |
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