JP3434019B2 - How to Recycle Cement Flake Board Waste - Google Patents

How to Recycle Cement Flake Board Waste

Info

Publication number
JP3434019B2
JP3434019B2 JP12674794A JP12674794A JP3434019B2 JP 3434019 B2 JP3434019 B2 JP 3434019B2 JP 12674794 A JP12674794 A JP 12674794A JP 12674794 A JP12674794 A JP 12674794A JP 3434019 B2 JP3434019 B2 JP 3434019B2
Authority
JP
Japan
Prior art keywords
cement
heat treatment
cfb
waste
component
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
Application number
JP12674794A
Other languages
Japanese (ja)
Other versions
JPH07300354A (en
Inventor
隆吉 岡村
誠一 橋本
俊一郎 宇智田
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.)
Taiheiyo Cement Corp
Original Assignee
Taiheiyo Cement 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 Taiheiyo Cement Corp filed Critical Taiheiyo Cement Corp
Priority to JP12674794A priority Critical patent/JP3434019B2/en
Publication of JPH07300354A publication Critical patent/JPH07300354A/en
Application granted granted Critical
Publication of JP3434019B2 publication Critical patent/JP3434019B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
    • C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

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、セメントフレークボー
ドの製造に際して発生する不良品、みみ処理品、スラッ
ジ等のセメントフレークボードの廃材、建物の解体現場
から回収されたセメントフレークボードの廃材を加熱処
理して、水との反応により失われた水硬性を回復させる
セメントフレークボード廃材の再生方法に関するもので
ある。[Field of Industrial Application] The present invention heats defective cement flakes produced during the production of cement flakes, stain-treated products, scraps of cement flakes such as sludge, and scraps of cement flakes recovered from the site of demolition of buildings. The present invention relates to a method for reclaiming cement flake board waste material, which is treated to recover the hydraulic property lost by the reaction with water.

【０００２】[0002]

【従来の技術】従来、セメントフレークボード（ＣＦＢ
とも呼ぶ。）を製造する際に生じる不良品や不要部分と
して切断したみみ処理品等はそのまま廃棄物として処理
する場合がほとんどであり、スラッジも加圧や遠心等の
方法により脱水・固化した後、廃棄物として処理する場
合がほとんどである。現在、何らかの処理を施すことに
よって、これらの不良品、みみ処理品、スラッジ等のＣ
ＦＢの廃材を有効に再利用する方法は存在せず、極く稀
に、適当な粒度に調整しただけのＣＦＢ廃材をＣＦＢの
原料であるところのポルトランド系セメントに極めて小
量添加・混合し、ＣＦＢ製造に再利用しているだけであ
る。2. Description of the Related Art Conventionally, cement flake board (CFB)
Also called. ) .In most cases, defective products that have been generated during the manufacturing process and processed products that have been cut as unnecessary parts are directly treated as waste, and sludge is also dehydrated and solidified by methods such as pressurization and centrifugation, and then discarded. In most cases Currently, by performing some kind of treatment, these defective products, stain-treated products, C of sludge, etc.
There is no method to effectively reuse the waste material of FB, and very rarely, a very small amount of CFB waste material, which has been adjusted to an appropriate particle size, is added to and mixed with Portland cement, which is a raw material of CFB. , CFB production only.

【０００３】一般にポルトランド系セメントは、一旦水
と混練された後も、相当の割合で未反応の成分が残存し
ており、潜在的な水硬性を保持した状態にある。しか
し、未反応物の表面は水和生成物で密に覆われているた
め、そのままの状態では本来の水硬性を示さない。した
がって、ＣＦＢ廃材をそのままの状態で直接添加・混合
する上述のような方法は、製品の著しい品質劣化を招
き、有効な利用方法とは言えない。[0003] Generally, even after once kneaded with water, the Portland cement has a considerable proportion of unreacted components remaining, and is in a state of retaining latent hydraulic properties. However, since the surface of the unreacted material is densely covered with the hydration product, the original hydraulic property is not shown in the state as it is. Therefore, the above-mentioned method of directly adding and mixing the CFB waste material as it is causes significant deterioration of the quality of the product and cannot be said to be an effective use method.

【０００４】[0004]

【発明が解決しようとする課題】本発明は、上述したよ
うな点に鑑みなされたもので、セメントフレークボード
（ＣＦＢ）を製造する際に生じる不良品、みみ処理品、
スラッジ等のＣＦＢ廃材、さらには、建物の解体現場か
ら回収されたＣＦＢ廃材から再生セメントを作り、再び
ＣＦＢの原料のセメントに混合して利用しようとするも
のである。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is a defective product, a stain-treated product, which occurs when a cement flake board (CFB) is manufactured,
Recycled cement is made from CFB waste materials such as sludge and CFB waste materials collected from the site of dismantling a building, and is mixed with the cement used as the raw material of CFB to be used again.

【０００５】[0005]

【課題を解決するための手段】かかる実情において本発
明者らは、ＣＦＢ廃材の有効利用を可能にすべく鋭意検
討した結果、ＣＦＢ廃材を粉砕した後、３００℃〜９５
０℃の条件で加熱処理して、硬化セメント成分中の自由
水及び水和生成物中の結合水の脱水を行なうことによ
り、残存する未反応セメント成分の表面活性が大幅に増
大し、本来の水硬性が回復し、同時に木材成分も消失す
るため、製品の品質劣化を招くことなく、ＣＦＢの原料
のポルトランド系セメントに廃材からの再生セメントを
多量に添加・混合することが可能になることを見い出
し、本発明を完成するに到った。Under the circumstances, the inventors of the present invention have made earnest studies to enable effective use of CFB waste materials, and as a result, after crushing the CFB waste materials, 300 ° C. to 95 ° C.
By performing heat treatment at 0 ° C. to dehydrate the free water in the hardened cement component and the bound water in the hydrated product, the surface activity of the remaining unreacted cement component is significantly increased, and Since the hydraulic property is restored and the wood component is also lost at the same time, it becomes possible to add and mix a large amount of recycled cement from waste material to the Portland cement that is the raw material of CFB without degrading the quality of the product. The present invention has been completed and the present invention has been completed.

【０００６】本発明が対象とするセメントフレークボー
ド（ＣＦＢ）の廃材は、ＣＦＢを製造する際に生じる不
良品、みみ処理品、スラッジ等のＣＦＢ廃材、さらに
は、建物の解体現場から回収されたＣＦＢ廃材である。
ＣＦＢの廃材の成分としては、ＣＦＢの原料に由来する
ポルトランド系のセメント、すなわち、ポルトランドセ
メントや、これにフライアッシュ、スラグ、シリカフュ
ーム等のポゾラン物質を混合した種々のポルトランド系
の混合セメント等が水和硬化した硬化セメント成分と、
木材を解砕して繊維フレーク状とした木材成分とが主体
で、場合によっては、製造時に添加した少量の急結材、
凝結促進材、膨脹材、発泡材、凝結遅延剤、減水剤、収
縮低減剤、増粘剤等の無機混和材や有機混和剤が残存し
ていることもあり、さらには、細骨材を併用することも
あるので、細骨材も含まれていることもあるが、これら
の硬化セメント成分及び木材成分以外の成分が含まれて
いても構わない。The waste material of cement flake board (CFB), which is the object of the present invention, is a defective product generated during the production of CFB, a treated waste product, a waste material of CFB such as sludge, and further, it is recovered from the site of dismantling a building. It is a CFB waste material.
The components of CFB waste materials include Portland cement derived from CFB raw materials, that is, Portland cement, and various Portland mixed cements obtained by mixing poland materials such as fly ash, slag, and silica fume. And a hardened cement component that is hydrated and hardened,
Mainly composed of wood components that are crushed wood into fiber flakes, and in some cases, a small amount of quick-setting material added during production,
Inorganic admixtures such as setting accelerators, expanding agents, foaming agents, setting retarders, water-reducing agents, shrinkage-reducing agents, thickeners and organic admixtures may remain. Therefore, fine aggregate may be contained, but components other than the hardened cement component and the wood component may be contained.

【０００７】ＣＦＢ廃材は、製造時に発生したものの場
合、水分が多いため、乾燥した方が良く、その後、適度
な粉末度に調整してから、加熱処理を行うのが望ましい
が、乾燥の程度や粉末度は加熱処理に要する時間が変化
するだけで、得られる半水硬性材料の品質には影響しな
い。また、廃材に含まれる木材あるいは有機混和剤は、
加熱処理時の燃焼により失われるので、再生セメントの
品質への影響を残すことはない。とくに、４００℃弱の
温度で有機成分の大部分を占める木材を迅速に燃焼させ
ることができるため、４００℃以上の加熱処理温度が好
ましいが、時間をかければ、３００℃でも有機成分のほ
とんど消失させることができる。In the case of CFB waste generated during the production, since it has a large amount of water, it is better to dry it. It is desirable that the CFB waste is adjusted to an appropriate degree of fineness and then heat-treated. The fineness of the powder only changes the time required for the heat treatment and does not affect the quality of the obtained semi-hydraulic material. In addition, the wood or organic admixture contained in the waste wood is
Since it is lost by combustion during heat treatment, it does not affect the quality of the recycled cement. In particular, a heat treatment temperature of 400 ° C or higher is preferable because wood that occupies most of the organic components can be quickly burned at a temperature of less than 400 ° C, but if the time is long, most of the organic components disappear even at 300 ° C. Can be made.

【０００８】そして、木材の燃焼による発熱は、硬化セ
メント成分の加熱処理に利用することができ、たとえ
ば、一般的なセメント成分７５重量部、木材成分２５重
量部の廃材では、加熱処理にロータリーキルンを用いて
処理温度を７００℃とした場合、エネルギーロスを多め
に見積もったとしても、廃材中の木材成分の燃焼による
発熱だけで、７００℃の温度の維持が可能である。した
がって、粉砕したＣＦＢ廃材をロータリーキルンに導入
するとともに、廃材中の木材成分にバーナーで点火する
と、木材成分の燃焼熱を硬化セメント成分の脱水に利用
することができ、したがって、バーナーは、初期の予熱
時の温度上昇と、廃材の含水率の変動や冬季における放
熱量の変動等の異常時における加熱処理温度の維持とに
用いるだけで良い。The heat generated by the combustion of wood can be utilized for the heat treatment of the hardened cement component. For example, in the case of 75 parts by weight of a general cement component and 25 parts by weight of a wood component, a rotary kiln is used for the heat treatment. When the treatment temperature is 700 ° C., the temperature of 700 ° C. can be maintained only by the heat generated by the combustion of the wood component in the waste material, even if the energy loss is estimated to be large. Therefore, when the crushed CFB waste material is introduced into the rotary kiln and the wood component in the waste material is ignited by the burner, the heat of combustion of the wood component can be utilized for the dehydration of the hardened cement component, and therefore the burner can use the initial preheating. It is sufficient to use it only for the temperature rise at the time and for maintaining the heat treatment temperature at the time of abnormality such as fluctuation of water content of waste materials and fluctuation of heat radiation in winter.

【０００９】また、骨材のような無機物は篩い分けなど
により分離して、硬化セメント成分の比率を高めた上で
加熱処理することが望ましいが、この分離工程を省略し
た場合でも、無機系の非水硬性成分に起因する再生セメ
ントの水硬性の低下は、再利用時の添加量を低めに設定
することにより回避できる。そして、骨材を除く無機系
の混和材は残存していたとしても、もともとの使用量が
少ないため、再生セメントの水硬性に対する影響は極め
て少ない。In addition, it is desirable to separate inorganic substances such as aggregates by sieving, increase the ratio of hardened cement components, and heat-treat. The decrease in the hydraulic property of the recycled cement due to the non-hydraulic component can be avoided by setting the addition amount at the time of reuse to be low. Even if the inorganic admixture excluding the aggregate remains, the amount of the admixture originally used is small, and therefore the influence of the recycled cement on the hydraulic property is extremely small.

【００１０】加熱処理は高い温度で行うほど水硬性を速
やかにかつ大きく回復させる事ができる。特に９５０℃
以上の温度で処理すれば、水和生成物から新たに水硬性
物質が生成するため当然高い水硬性が得られる。しか
し、本発明の主な目的は、自由水及び水和生成物中の結
合水の除去と残存未反応水硬性物質の表面活性の回復を
行うことで、廃材が本来もっている水硬性を全て引き出
すことにあり、加熱温度は９５０℃以下、６００℃〜８
００℃程度で、硬化セメント成分の水硬性の回復が速や
かに行われ、再生セメントに十分な品質が得られる。そ
の主な理由は上述の水硬性材料の水和生成物のほとんど
がこれ以下の加熱処理で脱水することによる。主な水和
物について具体例を上げれば、珪酸カルシウム水和物、
カルシウムアルミネート水和物及びカルシウムサルホア
ルミネート水和物の結合水は３００℃でほぼ完全に脱水
し、水酸化カルシウムの結合水は４５０℃ないし５００
℃で脱水する。When the heat treatment is performed at a higher temperature, the hydraulic property can be recovered more quickly and largely. Especially 950 ° C
When the treatment is carried out at the above temperature, a new hydraulic substance is newly produced from the hydration product, so naturally high hydraulic property is obtained. However, the main purpose of the present invention is to remove the bound water in the free water and the hydrated product and to recover the surface activity of the remaining unreacted hydraulic material, so as to bring out all the hydraulic properties originally possessed by the waste material. In particular, the heating temperature is 950 ° C or lower, 600 ° C to 8 ° C.
At about 00 ° C., the hydraulic property of the hardened cement component is promptly recovered, and sufficient quality can be obtained for the recycled cement. The main reason for this is that most of the hydration products of the above hydraulic materials are dehydrated by heat treatment below this. Specific examples of main hydrates include calcium silicate hydrate,
The bound water of calcium aluminate hydrate and calcium sulfoaluminate hydrate is almost completely dehydrated at 300 ° C, and the bound water of calcium hydroxide is 450 ° C to 500 ° C.
Dehydrate at ℃.

【００１１】また、建物の解体現場から回収されたＣＦ
Ｂ廃材中の硬化セメント成分の水和物は炭酸化している
ことがあるが、これらの炭酸化物、特に炭酸カルシウム
の脱炭酸には９００℃ないし９５０℃の温度が必要であ
る。加熱処理による水硬性の回復の程度は、これらの各
種水和生成物及び炭酸化物の脱水及び脱炭酸の温度に対
応する。３００℃以下の加熱処理では、温度が低くなる
にしたがって脱水せずに残存する水和物が多くなるた
め、得られる水硬性は急激に低下する。CF recovered from the site of demolition of the building
Although the hydrate of the hardened cement component in the waste material B may be carbonated, a temperature of 900 ° C to 950 ° C is required for decarboxylation of these carbonates, especially calcium carbonate. The degree of hydraulic recovery by heat treatment corresponds to the dehydration and decarboxylation temperatures of these various hydration products and carbonates. In the heat treatment at 300 ° C. or lower, as the temperature becomes lower, the amount of hydrate remaining without dehydration increases, so that the obtained hydraulic property sharply decreases.

【００１２】一方、処理費用の面から考えると、加熱処
理温度は低いほど好ましい。９５０℃ないし１０００℃
を越えると、上述のように新たに水硬性物質が生成し始
めるため、固結物ないし焼結物が生じ、加熱処理後の粉
砕費用がかさむため好ましいとはいえない。On the other hand, from the viewpoint of treatment cost, the lower the heat treatment temperature, the better. 950 ° C to 1000 ° C
If it exceeds the above range, a new hydraulic substance starts to be generated as described above, so that a solidified substance or a sintered substance is generated, and the crushing cost after the heat treatment is increased, which is not preferable.

【００１３】したがって、加熱処理温度は、３００℃な
いし９５０℃であるが、処理時間の関係から、好ましく
は５００℃ないし９５０℃、さらに、製造時に発生した
ＣＦＢ廃材についてのみ考えると、処理時間とエネルギ
ーの関係から、６００℃ないし８００℃がより好まし
い。Therefore, the heat treatment temperature is 300 ° C. to 950 ° C., but it is preferably 500 ° C. to 950 ° C. from the relation of the treatment time. Further, considering only the CFB waste material generated at the time of production, the treatment time and energy. Therefore, 600 ° C. to 800 ° C. is more preferable.

【００１４】また、廃材の粉砕の程度は、加熱処理の温
度及び時間に影響を与えるほか、処理後の再生セメント
の品質にも影響するので、一般には細かい程良いが、本
発明の場合、固結物や焼結物を生成させないように加熱
処理を行うため、加熱処理した廃材は脆くなり、簡単に
粉砕（解砕）することができ、再生セメントとして他の
ＣＦＢ原料と混合・混練する際に、細かく解砕される。
したがって、加熱処理前の粒度は、加熱処理後に解砕を
行う場合には、数ｃｍ以下が好ましく、改めて解砕しな
いで、再使用する場合には、５ｍｍ以下に粉砕した状態
で加熱処理を行えば良い。Further, the degree of pulverization of the waste material affects not only the temperature and time of the heat treatment but also the quality of the recycled cement after the treatment, so finer particles are generally finer, but in the case of the present invention, the Since the heat treatment is performed to prevent the formation of sinter and sinter, the heat-treated waste material becomes brittle and can be easily crushed (crushed). When mixed with other CFB raw materials as recycled cement Then, it is finely crushed.
Therefore, the particle size before the heat treatment is preferably several cm or less when the crushing is performed after the heat treatment, and the crushed particles are crushed to 5 mm or less when reused without crushing again. I'm fine.

【００１５】そうして、このようにしてＣＦＢ廃材から
得られた再生セメントは、ＣＦＢ原料のポルトランド系
セメント１００重量部に対して７５重量部以下の割合で
添加・混合し、ＣＦＢの原料として使用することができ
る。再生セメントの混合量が７５重量部を越えると、製
品の強度等の品質は急激に低下するが、７５重量部以下
での品質低下は比較的小さい。製品の品質低下を避けな
がら廃材を有効活用するためには、再生セメントの混合
量を７５重量部以下とする必要があり、好ましくは５０
重量部以下とするのが良い。The regenerated cement thus obtained from the CFB waste material is added and mixed at a ratio of 75 parts by weight or less with respect to 100 parts by weight of Portland type cement which is a CFB raw material, and used as a raw material of CFB. Can be used. When the mixing amount of the recycled cement exceeds 75 parts by weight, the quality of the product such as strength sharply deteriorates, but the deterioration of the quality of 75 parts by weight or less is relatively small. In order to make effective use of waste materials while avoiding deterioration of product quality, the amount of recycled cement mixed must be 75 parts by weight or less, preferably 50 parts by weight.
It is preferable to use less than or equal to parts by weight.

【００１６】[0016]

【作用】本発明によれば、ＣＦＢ廃材から簡単に再生セ
メントを得ることができ、この再生セメントをＣＦＢ原
料のポルトランド系セメントに混合して使用することが
できる。According to the present invention, regenerated cement can be easily obtained from CFB waste materials, and this regenerated cement can be used by mixing it with Portland type cement as a CFB raw material.

【００１７】[0017]

【実施例】（１）再生セメントの製造 ＣＦＢの製造工程で発するみみ処理品及び不良品で、原
料配合の異なる次の２種の廃材、 Ａ：セメント７５重量部＋木材フレーク２５重量部の配
合で、１．５重量部の有機系減水剤：マイティを使用し
て製造した製品から発生したもの、 Ｂ：セメント７５重量部＋木材フレーク２５重量部の配
合で、１．５重量部の有機系減水剤・マイティと、３重
量部の無機系硬化促進材：塩化カルシウムを使用して製
造した製品から発生したもの、を用いて次のように再生
セメント製造した。[Examples] (1) Manufacture of recycled cement The following two types of waste materials with different raw material blends, which are stain treated products and defective products generated in the CFB manufacturing process, A: 75 parts by weight of cement + 25 parts by weight of wood flakes And 1.5 parts by weight of organic water reducing agent: generated from a product manufactured by using Mighty, B: 75 parts by weight of cement + 25 parts by weight of wood flakes, 1.5 parts by weight of organic type Regenerated cement was manufactured as follows using a water reducing agent, Mighty, and 3 parts by weight of an inorganic hardening accelerator: a product generated from a product manufactured using calcium chloride.

【００１８】２種の廃材を、それぞれ全量が２ｍｍの篩
を通過するように粉砕した後、所定の温度、１５０℃、
３００℃、７００℃、９００℃及び１３００℃で、２時
間加熱処理することにより再生セメントを製造した。な
お、９００℃以下で加熱した試料は、加熱処理後でも軽
く凝集しているだけであるため、そのまま次の品質評価
試験に用いたが、１３００℃で加熱した試料は加熱中に
部分的に溶融して塊状となるため、加熱処理後に再び全
量が２ｍｍの篩を通過するように粉砕して次の品質評価
試験に供した。The two kinds of waste materials were crushed so that each of them passed through a sieve of 2 mm in total amount, and then crushed at a predetermined temperature of 150 ° C.
Regenerated cement was produced by heat treatment at 300 ° C, 700 ° C, 900 ° C and 1300 ° C for 2 hours. The sample heated at 900 ° C or lower was used for the next quality evaluation test as it was because it was only lightly aggregated after the heat treatment. However, the sample heated at 1300 ° C was partially melted during heating. Since it became a lump, it was crushed again after the heat treatment so as to pass through a sieve of 2 mm in total, and subjected to the next quality evaluation test.

【００１９】（２）再生セメントの品質評価試験 加熱処理温度の異なる各再生セメントを、普通ポルトラ
ンドセメント（ＯＰＣ）１００重量部に対して所定の割
合、１０、３０、５０、７５及び１００重量部添加・混
合して、ＪＩＳモルタル強さ試験を行った。試験材令は
３、７及び２８日とした。また、これとあわせて、再生
セメント無添加（ＯＰＣ単味）と、加熱処理しない廃材
Ａ（未加熱処理品）を所定の割合添加・混合したものの
試験も行った。結果を表１及び表２に示す。 (2) Quality Evaluation Test of Regenerated Cement Each regenerated cement having a different heat treatment temperature is added in a predetermined ratio of 10, 30, 50, 75 and 100 parts by weight to 100 parts by weight of ordinary Portland cement (OPC).・ Mixed and subjected to JIS mortar strength test. The test material ages were 3, 7 and 28 days. Along with this, a test was also conducted in which recycled cement was not added (OPC alone) and waste material A that was not heat-treated (unheated product) was added and mixed at a predetermined ratio. The results are shown in Tables 1 and 2.

【００２０】[0020]

【表１】 [Table 1]

【００２１】[0021]

【表２】 [Table 2]

【００２２】１５０℃で加熱処理した廃材Ａを添加した
場合の強度は、未加熱処理の廃材Ａを同じ割合で添加し
た場合とほぼ同等であり、加熱処理の効果は認められな
い。一方、３００℃以上で加熱処理した本発明品の場合
は、添加量の増加に伴って強度は低下するものの、未加
熱処理のものを同じ割合で添加した場合に比べて明らか
に高い強度を示す。一般によく知られているように、セ
メント系の水和物のうち水酸化カルシウム以外のもの
は、ほぼ３００℃で完全に脱水が完成する。このことか
ら、３００℃未満で加熱処理の効果が認められないの
は、脱水せずに残存する水和物の量が多いために水硬性
を十分に回復できないためと考えられる。The strength when the waste material A heat-treated at 150 ° C. is added is almost the same as when the unheated waste material A is added at the same ratio, and the effect of the heat treatment is not recognized. On the other hand, in the case of the product of the present invention heat-treated at 300 ° C. or higher, the strength decreases as the addition amount increases, but the strength is clearly higher than that in the case where the unheated product is added at the same ratio. . As is generally well known, among the cement-based hydrates other than calcium hydroxide, complete dehydration is completed at about 300 ° C. From this, it is considered that the reason why the effect of the heat treatment is not observed at a temperature lower than 300 ° C. is that the hydraulic property cannot be sufficiently restored because the amount of the hydrate remaining without dehydration is large.

【００２３】また、再生セメントは加熱処理の温度が高
いほど高い水硬性を示し、これを混合使用したセメント
のＪＩＳモルタル圧縮強さは大きくなる。特に、加熱処
理温度を３００℃から７００℃に上げたときの圧縮強さ
の増大は大きい。加熱処理温度を１３００℃とすること
によって圧縮強さは更に増大するが、９００℃のものも
遜色のない圧縮強さを示している。３００℃の場合に比
べて７００℃のときの水硬性及び圧縮強さが著しく大き
いのは、水和物に覆われていた未水和物表面の水硬性を
回復する効果が温度上昇により大きくなると共に、廃材
に含有されたいた木材成分やその他の有機物が燃焼によ
り消失することが大きく影響している。Further, the higher the temperature of the heat treatment of the regenerated cement, the higher the hydraulic hardness, and the JIS mortar compressive strength of the cement mixed with the regenerated cement becomes higher. In particular, when the heat treatment temperature is increased from 300 ° C to 700 ° C, the compression strength is greatly increased. Although the compressive strength is further increased by setting the heat treatment temperature to 1300 ° C., the compressive strength of 900 ° C. is comparable to that. The hydraulic properties and compressive strength at 700 ° C are remarkably greater than those at 300 ° C because the effect of recovering the hydraulic properties of the surface of the unhydrated hydrate covered with hydrate becomes greater due to the temperature increase. At the same time, the fact that the wood components and other organic substances contained in the waste wood disappear due to combustion has a great influence.

【００２４】再生セメントを混合使用したセメントのモ
ルタル圧縮強さは、混合割合が多くなるほど低下する
が、再生セメントの混合割合が７５重量部以下であれ
ば、混合割合の増加に伴う圧縮強さの低下は比較的緩や
かである。加熱処理温度が高い場合でも、混合割合が７
５重量部を越えると強度は急激に低下する。再生セメン
トは、これを使用する製品の目的とする強度に合わせ
て、加熱処理の温度と混合使用の割合を適切に設定する
のが好ましい。ＣＦＢ廃材は、大量の有機物（木材）と
比較的小量の有機系及び無機系混和材を含有している
が、上述の結果から、これら非水硬性材料の混在が再生
セメントに対して何らの悪影響も及ぼさないことは明ら
かである。The mortar compressive strength of cement mixed with recycled cement decreases as the mixing ratio increases, but if the mixing ratio of recycled cement is 75 parts by weight or less, the compressive strength of the cement increases as the mixing ratio increases. The decline is relatively gradual. Even if the heat treatment temperature is high, the mixing ratio is 7
If the amount exceeds 5 parts by weight, the strength sharply decreases. It is preferable that the temperature of the heat treatment and the ratio of the mixed use of the recycled cement are appropriately set according to the intended strength of the product using the recycled cement. The CFB waste material contains a large amount of organic matter (wood) and a relatively small amount of organic and inorganic admixtures. From the above results, it can be seen that the mixture of these non-hydraulic materials has no effect on the recycled cement. It is clear that there is no adverse effect.

【００２５】[0025]

【発明の効果】上述したように、本発明によれば、硬化
セメント成分の脱水と木材成分の燃焼を行なうことによ
り、セメントフレークボード廃材から簡単に再生セメン
トを得ることができ、しかも、この再生セメントは、硬
化セメント成分の水硬性を回復させただけで、水硬性物
質を新たに生成させたものではないため、固結物ないし
焼結物が生じることがなく、したがって、加熱処理後の
粉砕費用がかさむことはなく、処理条件と使用条件をう
まく設定することにより、そのまま、この再生セメント
をＣＦＢ原料のポルトランド系セメントに混合して使用
することができる。As described above, according to the present invention, by dewatering the hardened cement component and burning the wood component, it is possible to easily obtain a recycled cement from the cement flake board waste material. Cement does not produce a solidified substance or a sintered product because it only recovers the hydraulic property of the hardened cement component and does not generate a new hydraulic substance. This regenerated cement can be used as it is by mixing it with Portland-based cement, which is a CFB raw material, by appropriately setting the processing condition and the use condition without causing an increase in cost.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−247757（ＪＰ，Ａ) 特開 平５−208854（ＪＰ，Ａ) 特開 平５−319876（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 7/24 C04B 18/16 B09B 3/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-247757 (JP, A) JP-A-5-208854 (JP, A) JP-A-5-319876 (JP, A) (58) Field (Int.Cl. 7 , DB name) C04B 7/24 C04B 18/16 B09B 3/00

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 セメントフレークボード廃材を粉砕した
後、加熱炉内において３００℃〜９５０℃の温度で加熱
処理し、硬化セメント成分の脱水と木材成分の燃焼を行
なうことを特徴とするセメントフレークボード廃材の再
生方法。1. A cement flake board characterized by crushing waste cement flake board and then heat-treating it in a heating furnace at a temperature of 300 ° C. to 950 ° C. to dehydrate the hardened cement component and burn the wood component. How to recycle scrap wood. 【請求項２】 粉砕したセメントフレークボード廃材の
加熱処理にあたり、バーナーにより廃材中の木材成分に
点火し、木材成分の燃焼熱を硬化セメント成分の脱水に
利用するとともに、バーナーを加熱処理温度の維持に用
いることを特徴とする請求項１に記載のセメントフレー
クボード廃材の再生方法。2. In the heat treatment of the crushed cement flake board waste material, the burner ignites the wood component in the waste material, the combustion heat of the wood component is utilized for dehydration of the hardened cement component, and the burner is maintained at the heat treatment temperature. The method for reclaiming waste cement flake board according to claim 1, which is used for. 【請求項３】 セメントフレークボード廃材を５ｍｍ以
下に粉砕することを特徴とする請求項１または２に記載
のセメントフレークボード廃材の再生方法。3. The method for reclaiming waste cement flake board according to claim 1, wherein the waste cement flake board is crushed to a size of 5 mm or less.
JP12674794A 1994-04-28 1994-04-28 How to Recycle Cement Flake Board Waste Expired - Fee Related JP3434019B2 (en)

Priority Applications (1)

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JP12674794A JP3434019B2 (en) 1994-04-28 1994-04-28 How to Recycle Cement Flake Board Waste

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Application Number Priority Date Filing Date Title
JP12674794A JP3434019B2 (en) 1994-04-28 1994-04-28 How to Recycle Cement Flake Board Waste

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JPH07300354A JPH07300354A (en) 1995-11-14
JP3434019B2 true JP3434019B2 (en) 2003-08-04

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003327457A (en) * 2001-11-05 2003-11-19 Sekisui Chem Co Ltd Substitution for portland cement, production method thereof, hard block cement board obtained by using the same and production method thereof
DE102006049836B4 (en) * 2006-10-23 2011-06-16 Hochschule Neubrandenburg Process for the preparation of a hydraulically hardening binder of calcium silicate hydrates or cement stone as binding phase and aggregate-containing construction residues and its use
CN113979654B (en) * 2021-10-21 2022-08-26 东南大学 Gelling cyclic regeneration material of waste cement-based material and preparation method thereof

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