JPH05229858A - Production of artificial lightweight aggregate - Google Patents
Production of artificial lightweight aggregateInfo
- Publication number
- JPH05229858A JPH05229858A JP3165792A JP3165792A JPH05229858A JP H05229858 A JPH05229858 A JP H05229858A JP 3165792 A JP3165792 A JP 3165792A JP 3165792 A JP3165792 A JP 3165792A JP H05229858 A JPH05229858 A JP H05229858A
- Authority
- JP
- Japan
- Prior art keywords
- coal ash
- clay
- lightweight aggregate
- artificial lightweight
- 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.)
- Pending
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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は石炭灰より軽量コンクリ
ートの骨材に適用される人工軽量骨材の製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an artificial lightweight aggregate applied to an aggregate of concrete which is lighter than coal ash.
【０００２】[0002]
【従来の技術】石炭焚ボイラから排出される石炭灰の有
効利用技術の一環として軽量コンクリートの骨材に適用
される人工軽量骨材の製造方法が提案されている。2. Description of the Related Art As a part of effective utilization technology of coal ash discharged from a coal-fired boiler, a method of manufacturing an artificial lightweight aggregate applied to aggregate of lightweight concrete has been proposed.
【０００３】石炭灰を利用した人工軽量骨材の製造方法
は石炭灰に粘土を添加した混合物に水を混合し、パン型
ペレタイザを用いて粒径５〜２０ｍｍの生ペレットを造
粒し、これを焼結して製品骨材を製造している。この
際、焼結製品の絶乾比重が重視されるため、石炭灰の粗
粉混入率を増加することにより焼結製品の空隙率を高く
して軽量化を計っている。例えば特開昭６２−２５６７
４６号公報によると、ブレーン比表面積が２０００〜３
８００ｃｍ2 ／ｇである粗粉が原料に占める重量比を６
０％以上としており、得られる焼結製品の絶乾比重は
１．２７〜１．４３であると報告されている。A method of manufacturing an artificial lightweight aggregate using coal ash is to mix water into a mixture of coal ash and clay, and to granulate raw pellets having a particle size of 5 to 20 mm using a pan-type pelletizer. Is sintered to produce a product aggregate. At this time, since the absolute dry specific gravity of the sintered product is emphasized, the porosity of the sintered product is increased by increasing the coarse powder mixing ratio of the coal ash to reduce the weight. For example, Japanese Patent Laid-Open No. 62-2567
According to Japanese Patent No. 46, the Blaine specific surface area is 2000 to 3
The weight ratio of the coarse powder of 800 cm 2 / g to the raw material is 6
The specific gravity of the obtained sintered product is reported to be 1.27 to 1.43.
【０００４】[0004]
【発明が解決しようとする課題】人工軽量骨材（粗骨
材）はＪＩＳ Ａ５００２に規定されており、軽量化の
指標となる絶乾比重はＭ種で１．０〜１．５に設定され
ている。現在、市販されている人工軽量骨材の主体は頁
岩を原料とするもので、その絶乾比重は１．２５〜１．
３５である。このため、石炭灰から製造する人工軽量骨
材は頁岩と同等の品質が要求され、とりわけ絶乾比重が
重視されている。The artificial lightweight aggregate (coarse aggregate) is specified in JIS A5002, and the absolute dry specific gravity, which is an index for weight reduction, is set to 1.0 to 1.5 for M type. ing. Currently, commercially available artificial lightweight aggregates are mainly made of shale and have an absolute dry specific gravity of 1.25 to 1.
35. Therefore, the artificial lightweight aggregate manufactured from coal ash is required to have the same quality as that of shale, and especially the absolute dry specific gravity is emphasized.
【０００５】頁岩を原料とする人工軽量骨材は外部から
加熱することにより頁岩内部の有機物が発泡する現象を
利用して製造される。これに対し、石炭灰を原料とする
場合は石炭灰自身の発泡はなく、未燃カーボン分の消失
と物理的な空隙により軽量化を図っている。従って従来
法により人工軽量骨材を製造しようとしても、絶乾比重
が１．４前後であって、頁岩と同等のものを得ることは
極めて困難である。The artificial lightweight aggregate made from shale is manufactured by utilizing the phenomenon that organic substances inside the shale foam when heated externally. On the other hand, when coal ash is used as the raw material, there is no foaming of the coal ash itself, and the unburned carbon content disappears and physical voids are used to reduce the weight. Therefore, even if an artificial lightweight aggregate is produced by the conventional method, it is extremely difficult to obtain the same as shale because the absolute dry specific gravity is about 1.4.
【０００６】本発明は上記事情に注目してなされたもの
で、石炭灰を原料とした場合にも、頁岩と同等の絶乾比
重をもった人工軽量骨材を製造する方法を提供しようと
するものである。The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for producing an artificial lightweight aggregate having an absolutely dry specific gravity equivalent to that of shale even when using coal ash as a raw material. It is a thing.
【０００７】[0007]
【課題を解決するための手段】本発明は （１）石炭灰に粘土を添加して造粒、焼結して人工軽量
骨材を製造するに際し、ブレーン比表面積１５００〜２
０００ｃｍ2 ／ｇの石炭灰に粘結材として粘土を添加し
て造粒してペレットを製造した後、該ペレット表面に粘
土粉及び／又は石炭灰粉を被覆し、しかる後焼結するこ
とを特徴とする人工軽量骨材の製造方法。MEANS FOR SOLVING THE PROBLEMS The present invention is as follows. (1) When a clay is added to coal ash to granulate and sinter to manufacture an artificial lightweight aggregate, a Blaine specific surface area of 1500 to 2
Clay was added to 000 cm 2 / g of coal ash as a binder to granulate it to produce pellets, and then the surface of the pellets was coated with clay powder and / or coal ash powder, and then sintered. A method for manufacturing a characteristic artificial lightweight aggregate.
【０００８】（２）粘結材として石炭灰に対し２〜１０
重量％の粘土を添加することを特徴とする上記（１）記
載の人工軽量骨材の製造方法。(2) 2 to 10 with respect to coal ash as a binder
The method for producing an artificial lightweight aggregate according to the above (1), characterized in that a clay% by weight is added.
【０００９】（３）ペレット表面に被覆する粘土粉の量
が、ペレットに対して３〜５重量％であることを特徴と
する上記（１）または（２）記載の人工軽量骨材の製造
方法。(3) The method for producing an artificial lightweight aggregate as described in (1) or (2) above, wherein the amount of the clay powder coated on the surface of the pellet is 3 to 5% by weight based on the pellet. ..
【００１０】（４）ペレット表面に被覆する石炭灰粉
が、ブレーン比表面積３５００〜５０００ｃｍ2 ／ｇで
あり、その量がペレットに対して５〜１０重量％である
ことを特徴とする上記（１）または（２）記載の人工軽
量骨材の製造方法。(4) The coal ash powder coated on the pellet surface has a Blaine specific surface area of 3500 to 5000 cm 2 / g, and the amount thereof is 5 to 10% by weight with respect to the pellet (1). ) Or (2), the method for producing the artificial lightweight aggregate.
【００１１】（５）ペレット表面に被覆する粘土粉と石
炭粉の混合粉量がペレットに対して３重量％以上である
ことを特徴とする上記（１）または（２）記載の人工軽
量骨材の製造方法。である。(5) The artificial lightweight aggregate described in (1) or (2) above, characterized in that the amount of the mixed powder of clay powder and coal powder coated on the pellet surface is 3% by weight or more based on the pellet. Manufacturing method. Is.
【００１２】[0012]
【作用】従来法では、ブレーン比表面積が４０００ｃｍ
2 ／ｇ前後の石炭灰に、粘結剤としての粘土を石炭灰に
対して２重量％添加し、これに注水しながら、造粒物を
造粒し、しかるのち、焼成雰囲気中のＯ2 濃度を制御し
て約１１００℃にて焼成して人工軽量骨材を製造してい
たが、得られる人工軽量骨材の絶乾比重は１．４前後で
あった。上記従来法との比較による本発明における作用
は次の通りである。In the conventional method, the Blaine specific surface area is 4000 cm.
The 2 / g before and after the coal ash, clay as binder was added 2% by weight with respect to coal ash, with water injection thereto to granulate the granules, after accordingly, O 2 in the sintering atmosphere Although the artificial lightweight aggregate was manufactured by controlling the concentration and firing at about 1100 ° C, the absolute dry specific gravity of the obtained artificial lightweight aggregate was about 1.4. The operation of the present invention by comparison with the above conventional method is as follows.
【００１３】本発明では石炭灰のブレーン比表面積は１
５００〜２０００ｃｍ2 ／ｇであり、従来の石炭灰粒度
に比べて、粗粉を主体とした粗い粒度構成としたもの
で、これにより生ペレットの空隙率を高くするものであ
る。（従来の石炭灰は逆に、細粉を主体としたものであ
るので、生ペレットの空隙率は低くなる。）In the present invention, the Blaine specific surface area of coal ash is 1
It is 500 to 2000 cm 2 / g, and has a coarse particle size structure mainly composed of coarse powder as compared with the conventional coal ash particle size, thereby increasing the porosity of the raw pellets. (Conversely, conventional coal ash is mainly composed of fine powder, so the porosity of raw pellets is low.)
【００１４】一方、本発明の石炭灰は粗い粒度構成のた
め、従来の粘土２重量％添加では造粒物の造粒性が著し
く低下する。この要因は造粒物の空隙率が高く、粒子間
の結合力が弱いためである。そのため、石炭灰の粒子間
結合力を高めるため、従来法に比較して粘土を増量する
必要がある。On the other hand, since the coal ash of the present invention has a coarse particle size composition, the addition of 2% by weight of the conventional clay significantly reduces the granulation property of the granulated product. This is because the granulated product has a high porosity and the bonding force between the particles is weak. Therefore, it is necessary to increase the amount of clay compared with the conventional method in order to increase the interparticle binding force of coal ash.
【００１５】また、生ペレットを焼成するに際しては大
気と隔絶した複数の燃焼域を有する焼成炉を使用して行
なうが、生ペレットの着火温度を１０００〜１２００℃
以内に制御することにより、絶乾比重を低い値にするこ
とが可能である。しかし、上記、焼成ペレットは石炭灰
の粗い粒子で構成されているため、焼成設備内でのコン
ベヤ輸送時に著しい粉化を生じ、生産歩留りを悪化さ
せ、そのために、生ペレット表面に粘土及び／又は石炭
灰粉を被覆するようにするものである。When firing the raw pellets, a firing furnace having a plurality of combustion zones isolated from the atmosphere is used. The firing temperature of the raw pellets is 1000 to 1200 ° C.
By controlling within the range, it is possible to make the absolute dry specific gravity to a low value. However, since the fired pellets are composed of coarse particles of coal ash, significant powdering occurs during conveyor transportation in the firing equipment, which deteriorates the production yield, and therefore clay and / or clay on the surface of the raw pellets. It is intended to coat coal ash powder.
【００１６】本発明において、石炭灰の粘結材として使
用される粘土は一般的に粘土と呼ばれるものであればよ
く、木節粘土、蛙目粘土、耐火粘土、ベントナイトなど
多くのものがあげられる。In the present invention, the clay used as a binder for coal ash may be any clay generally called clay, and many kinds such as kibushi clay, frog clay, refractory clay and bentonite can be mentioned. ..
【００１７】[0017]
【実施例】粘度構成の粗い分級、調整した石炭灰を用い
て、低比重軽量骨材を製造するために用いられる装置を
図１に示す。図１において、１、２は分級した石炭灰及
び粘土（木節粘土）を収容するホッパで、同ホッパ１、
２から石炭灰及び粘土が混練機３に供給され、水３′を
注水して混練された上、パン型造粒機４において造粒が
行なわれ生ペレットとなる。EXAMPLE FIG. 1 shows an apparatus used for producing a low specific gravity lightweight aggregate by using coarsely classified and adjusted coal ash having a viscous composition. In FIG. 1, 1 and 2 are hoppers for storing classified coal ash and clay (Kibushi clay).
Coal ash and clay are supplied from 2 to the kneading machine 3, water 3 ′ is poured and kneaded, and then granulated in the pan-type granulator 4 to obtain raw pellets.
【００１８】この生ペレットはベルトコンベヤ５にて輸
送され、生ペレット表面に石炭灰及び／又は粘土粉を収
容するホッパ７からこれらの細粉（平均粒径１１μｍ）
を被覆するためにパン型造粒機６に投入され、細粉で被
覆された生ペレットは生ペレット投入用ホッパ８に収容
される。８′は焼成製品（焼成ペレット）を収容した床
敷ペレット投入用ホッパで、同ホッパ８′と上記生ペレ
ット投入用ホッパ８からペレットが大気と隔絶された焼
成炉９に投入される。９′は焼成炉９のグレードであ
り、１１はグレード９′の下方に設けられた吸引ボック
ス１０からの吸引を行なうブロワである。１４は焼成炉
９で焼成されたペレットを製品回収ホッパ１５へ送るベ
ルトコンベヤである。上記ブロワ１１で吸引された焼成
炉９内の雰囲気は焼成炉９へ循環されるようになってい
る。また、１２は焼成炉９の着火装置、１３は焼成炉９
の仕切板である。The raw pellets are transported by a belt conveyor 5, and fine powder (average particle diameter 11 μm) of these is obtained from a hopper 7 containing coal ash and / or clay powder on the surface of the raw pellets.
The raw pellets, which are put into the pan-type granulator 6 to cover the raw material and are coated with fine powder, are stored in the raw pellet feeding hopper 8. Reference numeral 8'denotes a hopper for placing bedding on the floor which stores the baked products (baked pellets). The hopper 8'and the hopper 8 for charging the raw pellets feed the pellets into a baking furnace 9 isolated from the atmosphere. Reference numeral 9'denotes a grade of the firing furnace 9, and 11 denotes a blower for sucking from a suction box 10 provided below the grade 9 '. Reference numeral 14 is a belt conveyor for sending the pellets fired in the firing furnace 9 to the product recovery hopper 15. The atmosphere in the firing furnace 9 sucked by the blower 11 is circulated to the firing furnace 9. Further, 12 is an ignition device for the firing furnace 9, and 13 is the firing furnace 9.
It is a partition board.
【００１９】以下に上記装置を用いて、実証した焼成試
験結果を説明する。 （１）原料 本試験に用いた石炭灰及び粘土の化学組成及びブレーン
比表面積を表１に示す。The results of the verified firing test using the above apparatus will be described below. (1) Raw materials Table 1 shows the chemical composition and the Blaine specific surface area of the coal ash and clay used in this test.
【表１】 なお、造粒用の石炭灰（分級灰）には原石炭灰を１５０
０、１８００、２０００、２５００ｃｍ2 ／ｇに調整し
て使用した。[Table 1] In addition, as for the coal ash for granulation (classified ash), the raw coal ash is 150
It was adjusted to 0, 1800, 2000, 2500 cm 2 / g and used.
【００２０】（２）造粒試験結果 造粒法は直径１．５ｍの造粒機４を用いて、分級灰に粘
土を添加、混練し、注水しながら粒径５〜２０ｍｍの生
ペレットを造粒する。本試験では造粒不能の場合には粘
土添加量を増加させながら、造粒性を評価した。(2) Granulation test results In the granulation method, using a granulator 4 having a diameter of 1.5 m, clay was added to the classified ash, kneaded, and water was poured to prepare raw pellets having a particle size of 5 to 20 mm. Grain. In this test, when granulation was impossible, the granulation property was evaluated while increasing the amount of clay added.
【００２１】なお、上記の生ペレット表面には焼成ペレ
ットの粉化防止対策として粘土、細粉の単粉及び、粘土
と細粉の混合粉を被覆した。造粒性の評価結果を表２に
示す。なお、造粒性評価のうち、造粒性やゝ不良とは造
粒できるが軟質ペレットとなり、後工程にて粉化するも
の、造粒不良とは全く造粒できないものを示す。The surface of the raw pellets was coated with clay, a single fine powder, or a mixed powder of clay and fine powder as a measure for preventing pulverization of the fired pellets. Table 2 shows the evaluation results of the granulation property. In the evaluation of granulation property, the granulation property or poor quality indicates that granulation is possible but soft pellets are formed and powdered in a subsequent step, and the poor granulation property indicates that granulation is not possible at all.
【表２】 [Table 2]
【００２２】表２の結果より石炭灰のブレーン２０００
ｃｍ2 ／ｇ以上では粘土２重量％でも造粒性が良好であ
る。しかし、ブレーンが小さくなるに伴い、粒子間結合
力が弱くなるため、粘土を増量する必要がある。１８０
０ｃｍ2 ／ｇでは粘土３重量％以上、１５００ｃｍ2 ／
ｇでは１０重量％以上の粘土添加が必要となるが、製品
のコストアップになるため、１０重量％が適量となる。From the results shown in Table 2, coal ash brane 2000
When the content is cm 2 / g or more, the granulation property is good even with 2% by weight of clay. However, as the branes become smaller, the interparticle bonding force becomes weaker, so it is necessary to increase the amount of clay. 180
At 0 cm 2 / g, 3% by weight or more of clay is 1500 cm 2 /
With g, it is necessary to add 10% by weight or more of clay, but this increases the cost of the product, so 10% by weight is an appropriate amount.
【００２３】（３）焼成試験結果 本試験は図１の装置を用いて焼成し、実証した。本試験
に用いた石炭灰はブレーン２５００、２０００、１８０
０、１５００ｃｍ2 ／ｇを分級、調整したもの（生ペレ
ットは表２の配合のものを主に使用した）である。(3) Results of firing test This test was performed by firing using the apparatus shown in FIG. The coal ash used in this test was Blaine 2500, 2000, 180.
0, 1500 cm 2 / g was classified and adjusted (raw pellets having the composition shown in Table 2 were mainly used).
【００２４】石炭灰（分級灰）は石炭灰ホッパ１、粘土
は粘土ホッパ２、更に、石炭灰（細粉）は石炭灰ホッパ
７に投入する。分級灰、粘土の所定量を混合機３に供給
し、水３′を１５重量％注水しながら混練後、径１．５
ｍパン型造粒機４に供給し、粒径５〜２０ｍｍ（含水率
２０〜２５％）の生ペレットを造粒する。これらの生ペ
レットはベルトコンベヤ５で造粒部に送られ、次の径
１．０ｍパン型造粒機６にて、ホッパ７から供給される
石炭灰細粉及び／又は粘土粉により生ペレットの表面に
１〜１０重量％（但し、生ペレット重量％に対して）が
被覆され、次の生ペレット投入用ホッパ８に投入され
る。Coal ash (classified ash) is put into the coal ash hopper 1, clay is put into the clay hopper 2, and coal ash (fine powder) is put into the coal ash hopper 7. A predetermined amount of classified ash and clay is supplied to the mixer 3, and after kneading while pouring 15% by weight of water 3 ', the diameter is 1.5.
It is supplied to the m-bread type granulator 4 to granulate raw pellets having a particle size of 5 to 20 mm (water content 20 to 25%). These raw pellets are sent to the granulation unit by the belt conveyor 5, and the bread pelletizer 6 having the next diameter of 1.0 m produces the raw pellets by the fine coal ash powder and / or the clay powder supplied from the hopper 7. The surface is coated with 1 to 10% by weight (however, based on the weight of the raw pellets), and the raw pellets are fed to the next raw pellet feeding hopper 8.
【００２５】床敷ペレット投入用ホッパ８′から焼成ペ
レット、生ペレット投入用ホッパ８から生ペレットが、
大気と隔絶された焼成炉９に投入され、同焼成炉９にお
いて焼結させた。焼結に当ってはグレード９′上に床敷
ペレット投入用ホッパ８′から焼成ペレットを投入して
３０ｍｍ厚さで敷きつめて床敷とし、その上へ上記生ペ
レットを層高２５０ｍｍに積層した。The fired pellets are fed from the bedding hopper 8'for bedding on the floor and the raw pellets are fed from the hopper 8 for feeding the raw pellets.
It was placed in a firing furnace 9 isolated from the atmosphere and sintered in the same firing furnace 9. Upon sintering, fired pellets were placed on the grade 9'from the hopper 8'for placing bedding pellets and spread to a thickness of 30 mm to form a flooring, and the above-mentioned raw pellets were layered to a layer height of 250 mm.
【００２６】そして、グレード９′の下方の吸引ボック
ス１０から３０ｍｍＨ2 Ｏの圧力で吸引しつつ３００℃
の熱風で５分間乾燥した後、生ペレット表層を着火装置
１２（ＬＰＧバーナ）で着火させ、焼成炉９は焼成入口
ガス量１０００〜１４００Ｎｍ3 ／ｈ、焼成入口Ｏ2 濃
度１０〜１３％に制御して約３０〜４０分間焼結させ
た。なお、着火温度は１０００℃、１１００℃、１１５
０℃、１２００℃に変更した。得られた焼結製品（生ペ
レット性状は造粒のまゝである）の物性を表３に示す。Then, while suctioning at a pressure of 30 mmH 2 O from the suction box 10 below the grade 9'at 300 ° C.
After drying with hot air for 5 minutes, the raw pellet surface layer is ignited by an igniter 12 (LPG burner), and the firing furnace 9 controls the firing inlet gas amount to 1000 to 1400 Nm 3 / h and the firing inlet O 2 concentration to 10 to 13%. And sintered for about 30-40 minutes. The ignition temperature is 1000 ° C, 1100 ° C, 115
The temperature was changed to 0 ° C and 1200 ° C. Table 3 shows the physical properties of the obtained sintered product (the raw pellet property is granulated).
【表３】 [Table 3]
【００２７】表３の結果から、石炭灰のブレーンが小さ
くなるに伴い、絶乾比重も著しく小さくなり、かつ圧壊
強度も低下する。また着火温度の上昇に伴い、絶乾比
重、圧壊強度が上昇するが１２００℃以上ではペレット
同志の融着現象が生じ、１０００℃以下になると圧壊強
度が低下する。従って本試験に用いた石炭灰における適
正着火温度は、骨材物性から見て１，１５０℃と判断で
きる。From the results in Table 3, as the brane of coal ash becomes smaller, the absolute dry specific gravity also becomes remarkably smaller and the crushing strength also lowers. Further, as the ignition temperature rises, the absolute dry specific gravity and the crush strength increase, but at 1200 ° C. or higher, the pellet fusion phenomenon occurs, and at 1000 ° C. or lower, the crush strength decreases. Therefore, the proper ignition temperature of the coal ash used in this test can be judged to be 1,150 ° C. in view of the physical properties of the aggregate.
【００２８】ブレーン１８００ｃｍ2 ／ｇの石炭灰に粘
土３重量％添加した生ペレット表面に、石炭灰細粉及び
／又は粘土粉を被覆したものを、１１５０℃にて着火、
焼成した焼結製品の物性を表４に示す。[0028] Ignition was carried out at 1150 ° C by coating the surface of raw pellets obtained by adding 3% by weight of clay to 1800 cm 2 / g brane coal ash and coating fine coal ash powder and / or clay powder.
Table 4 shows the physical properties of the fired sintered product.
【表４】 [Table 4]
【００２９】表４の結果から生ペレット表面に粘土、細
粉の単粉、あるいは粘土と細粉の混合粉を被覆すると粉
化率が低減できることが分かる。粉化効果として粘土被
覆は１％では効果が少ない。３〜５％ではその効果もあ
るが、５％以上では効果が少なくコスト高となる。一
方、細粉被覆は被覆量の増加に伴い、著しい粉化防止効
果を発揮する。しかし、絶乾比重も徐々に増加するた
め、適正被覆量は５〜１０重量％である。また、粘土と
細粉の混合粉被覆も３重量％により粉化防止効果を充分
発揮することがわかる。この場合３重量％以下ならば、
生ペレットに対する被覆量が少なく粉化防止効果が少な
い。From the results shown in Table 4, it is understood that the pulverization rate can be reduced by coating the surface of the raw pellets with clay, a fine powder of fine powder, or a mixed powder of clay and fine powder. As for the powdering effect, the clay coating is less effective at 1%. If it is 3 to 5%, the effect is obtained, but if it is 5% or more, the effect is small and the cost becomes high. On the other hand, the fine powder coating exhibits a remarkable pulverization preventing effect as the coating amount increases. However, since the absolute dry specific gravity also gradually increases, the appropriate coating amount is 5 to 10% by weight. Further, it can be seen that the mixed powder coating of clay and fine powder also exerts a sufficient pulverization preventing effect by 3% by weight. In this case, if 3% by weight or less,
The amount of coating on raw pellets is small and the effect of preventing pulverization is small.
【００３０】上記、焼成試験結果から、分級、調整した
ブレーン１５００〜２０００ｃｍ2／ｇの石炭灰を用
い、かつ、造粒物表面に粘土、細粉の単粉、若しくは混
合粉を被覆したものを、大気と隔絶した焼成炉を用い
て、１０００〜１１５０℃にて着火、焼結させれば、本
発明の目的とする頁岩と同等の絶乾比重（１．２５〜
１．３５）が得られることを確認し、実用できることを
把握した。From the above-mentioned firing test results, it was determined that the classified and adjusted brane 1500 to 2000 cm 2 / g of coal ash was used, and the surface of the granulated product was coated with clay, fine powder single powder, or mixed powder. If a firing furnace isolated from the atmosphere is used to ignite and sinter at 1000 to 1150 ° C., an absolutely dry specific gravity (1.25 to 1.25) equivalent to that of the shale aimed at by the present invention is obtained.
It was confirmed that 1.35) was obtained, and it was understood that it could be put to practical use.
【００３１】[0031]
【発明の効果】ブレーン１５００〜２０００ｃｍ2 ／ｇ
の粗い石炭灰を使用するため生ペレットの造粒成形が困
難であった。本発明では石炭灰に粘土を２〜１０％添
加、混合することにより造粒成形を可能にした。しか
し、上記焼成ペレットは粉化率が大きく生産歩留りを悪
化させた。このため粉化防止策として、生ペレット表面
に粘土３〜５重量％、細粉を５〜１０重量％、もしくは
粘土、細粉の混合粉を３重量％以上被覆したものを焼成
すると粉化率が著しく低減し、生産歩留りも向上した。Effects of the invention Blaine 1500 to 2000 cm 2 / g
It was difficult to granulate green pellets because of the use of coarse coal ash. In the present invention, 2 to 10% of clay is added to and mixed with coal ash to enable granulation and molding. However, the above fired pellets had a large pulverization rate and deteriorated the production yield. Therefore, as a pulverization prevention measure, if the raw pellet surface is coated with 3 to 5% by weight of clay, 5 to 10% by weight of fine powder, or 3% by weight or more of a mixed powder of clay and fine powder is burned, the pulverization rate is increased. Was significantly reduced and the production yield was improved.
【００３２】また、上記生ペレットを大気と隔絶した焼
成炉を用いて、１０００〜１１５０℃にて着火すると、
焼結製品の絶乾比重は１．２０〜１．２５となり、頁岩
と同等のもの（１．２５〜１．３５）が得られることを
把握した。When the raw pellets are ignited at 1000 to 1150 ° C. in a firing furnace isolated from the atmosphere,
The absolute dry specific gravity of the sintered product was 1.20 to 1.25, and it was understood that a product equivalent to shale (1.25 to 1.35) was obtained.
【図１】本発明方法を実施するに適した焼成装置の一態
様の説明図。FIG. 1 is an explanatory view of an embodiment of a firing apparatus suitable for carrying out the method of the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤井 嘉則 広島県広島市中区小町４番33号 中国電力 株式会社内 (72)発明者 生田 耕治 広島県広島市中区小町４番33号 中国電力 株式会社内 (72)発明者 村上 英之 広島県広島市中区小町４番33号 中国電力 株式会社内 (72)発明者 世良 裕明 広島県広島市中区小町４番33号 中国電力 株式会社内 (72)発明者 貝 敏雄 広島県広島市西区観音新町四丁目６番22号 三菱重工業株式会社広島研究所内 (72)発明者 藤原 邦久 広島県広島市西区観音新町四丁目６番22号 三菱重工業株式会社広島研究所内 (72)発明者 蛇蝮 良峰 広島県広島市西区観音新町四丁目６番22号 三菱重工業株式会社広島研究所内 (72)発明者 田中 荘二 広島県広島市西区観音新町四丁目６番22号 三菱重工業株式会社広島製作所内 (72)発明者 世良 俊邦 東京都千代田区丸の内二丁目５番１号 三 菱重工業株式会社本社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Fujii 4-33 Komachi, Naka-ku, Hiroshima City, Hiroshima Prefecture Chugoku Electric Power Co., Inc. (72) Koji Ikuta 4-33 Komachi, Naka-ku, Hiroshima City, Hiroshima Prefecture (72) Inventor Hideyuki Murakami 4-33 Komachi, Naka-ku, Hiroshima City, Hiroshima Prefecture China Electric Power Co., Ltd. (72) Inventor Hiroaki Sera 4-33, Komachi, Naka City, Hiroshima City, Hiroshima Prefecture () 72) Inventor Toshio Kai 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Institute (72) Kunihisa Fujiwara 4-22 Kannon-shinmachi, Nishi-ku, Hiroshima City, Hiroshima Mitsubishi Heavy Industries, Ltd. Inside the Hiroshima Research Laboratory (72) Inventor Japou Ryoho 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries Ltd. Inside the Hiroshima Research Laboratory (72) Inventor Tanaka Two Hiroshima, Hiroshima Prefecture, Nishi-ku, Kan'onshin-cho, chome No. 6 No. 22 Mitsubishi Heavy Industries, Ltd. in Hiroshima Works (72) inventor Toshikuni Sera, Chiyoda-ku, Tokyo Marunouchi 2-chome fifth No. 1 Mitsubishi Heavy Industries Co., Ltd. in the head office
Claims (5)
人工軽量骨材を製造するに際し、ブレーン比表面積１５
００〜２０００ｃｍ2 ／ｇの石炭灰に粘結材として粘土
を添加して造粒してペレットを製造した後、該ペレット
表面に粘土粉及び／又は石炭灰粉を被覆し、しかる後焼
結することを特徴とする人工軽量骨材の製造方法。1. When producing artificial lightweight aggregate by adding clay to coal ash and granulating and sintering, a Blaine specific surface area of 15
Clay as a binder is added to the coal ash of 0 to 2000 cm 2 / g to granulate to produce pellets, and then the surface of the pellets is coated with clay powder and / or coal ash powder, and then sintered. A method of manufacturing an artificial lightweight aggregate characterized by the following.
％の粘土を添加することを特徴とする請求項１記載の人
工軽量骨材の製造方法。2. The method for producing an artificial lightweight aggregate according to claim 1, wherein 2 to 10% by weight of clay is added to the coal ash as a binder.
ペレットに対して３〜５重量％であることを特徴とする
請求項１または２記載の人工軽量骨材の製造方法。3. The amount of clay powder coated on the pellet surface is
The method for producing an artificial lightweight aggregate according to claim 1 or 2, wherein the content is 3 to 5% by weight based on the pellet.
レーン比表面積３５００〜５０００ｃｍ2 ／ｇであり、
その量がペレットに対して５〜１０重量％であることを
特徴とする請求項１または２記載の人工軽量骨材の製造
方法。4. The coal ash powder with which the pellet surface is coated has a Blaine specific surface area of 3500 to 5000 cm 2 / g,
The method for producing an artificial lightweight aggregate according to claim 1 or 2, wherein the amount is 5 to 10% by weight based on the pellet.
の混合粉量がペレットに対して３重量％以上であること
を特徴とする請求項１または２記載の人工軽量骨材の製
造方法。5. The method for producing an artificial lightweight aggregate according to claim 1, wherein the amount of the mixed powder of the clay powder and the coal powder with which the surface of the pellet is coated is 3% by weight or more based on the pellet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3165792A JPH05229858A (en) | 1992-02-19 | 1992-02-19 | Production of artificial lightweight aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3165792A JPH05229858A (en) | 1992-02-19 | 1992-02-19 | Production of artificial lightweight aggregate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05229858A true JPH05229858A (en) | 1993-09-07 |
Family
ID=12337222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3165792A Pending JPH05229858A (en) | 1992-02-19 | 1992-02-19 | Production of artificial lightweight aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05229858A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040008734A (en) * | 2002-07-19 | 2004-01-31 | 한갑수 | The manufacturing method of light weight material useing coal ash |
| JP2017065971A (en) * | 2015-09-30 | 2017-04-06 | 株式会社タイガーマシン製作所 | Method for producing lightweight aggregate |
-
1992
- 1992-02-19 JP JP3165792A patent/JPH05229858A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040008734A (en) * | 2002-07-19 | 2004-01-31 | 한갑수 | The manufacturing method of light weight material useing coal ash |
| JP2017065971A (en) * | 2015-09-30 | 2017-04-06 | 株式会社タイガーマシン製作所 | Method for producing lightweight aggregate |
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