JP6530300B2 - Method of treating board paper separated from waste gypsum board - Google Patents
Method of treating board paper separated from waste gypsum board Download PDFInfo
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- JP6530300B2 JP6530300B2 JP2015205996A JP2015205996A JP6530300B2 JP 6530300 B2 JP6530300 B2 JP 6530300B2 JP 2015205996 A JP2015205996 A JP 2015205996A JP 2015205996 A JP2015205996 A JP 2015205996A JP 6530300 B2 JP6530300 B2 JP 6530300B2
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Description
本発明は、廃石膏ボードから分離したボード紙を処理する方法に関する。詳しくは、廃石膏ボードを破砕して石膏芯材と分離したボード紙をセメントキルンに投入し、セメント製造用の原料として処理する方法に関する。 The present invention relates to a method of treating board paper separated from waste gypsum board. More specifically, the present invention relates to a method of processing waste as a raw material for cement production by putting waste gypsum board into a cement kiln by crushing crushed gypsum board and separating it from gypsum core material.
石膏ボードは、石膏芯材の両面を紙で張り合わせた複合材料であり、年間約４００万トン生産されている。それに対して、解体現場等で発生する廃石膏ボードは、年間約１００万トン排出され、その排出量は今後さらに増加することが予想されている。 Gypsum board is a composite material in which both sides of a plaster core material are laminated with paper, and about 4 million tons are produced annually. On the other hand, about 1 million tons of waste gypsum board generated at the dismantling site etc. is discharged annually, and it is expected that the discharge amount will further increase in the future.
このような廃石膏はリサイクルすることが望まれ、例えば、石膏芯材と紙を分離した後、石膏芯材を溶解させて再析出させるリサイクル技術が提案されている（例えば、特許文献１参照）。 Such waste gypsum is desired to be recycled, and for example, a recycling technology is proposed in which the gypsum core is dissolved and reprecipitated after separating the gypsum core and the paper (see, for example, Patent Document 1) .
また、石膏芯材と分離したボード紙は、廃石膏ボード全体の約１０質量％含まれ、該ボード紙の一部は、製紙会社にて、リサイクルされている。しかしながら、ボード紙には石膏が付着していることなどもあり、製紙会社のボード紙の受け入れ量には限界がある。 Also, the board paper separated from the gypsum core material is contained in about 10% by mass of the entire waste gypsum board, and a part of the board paper is recycled by a paper company. However, there is a limit to the amount of board paper accepted by a paper company, due to the adhesion of gypsum to board paper and the like.
従って、本発明の目的は、前記廃石膏ボードから分離されるボード紙を大量にリサイクルする方法を提案することにある。さらにボード紙には石膏が付着しているが、紙としてのリサイクルでは、この石膏が廃棄物となってしまうという問題も解決することを目的とする。 Therefore, an object of the present invention is to propose a method of recycling a large amount of board paper separated from the waste gypsum board. Furthermore, gypsum adheres to the board paper, but in recycling as paper, it aims to solve the problem that this gypsum becomes waste.
本発明者は、上記目的を達成すべく鋭意研究を重ねた。そして、セメント製造においては紙は熱源として、石膏は凝結遅延剤として利用可能なことに着目し本発明を完成した。
即ち本発明は、廃石膏ボードを石膏芯材とボード紙に分離した後、該ボード紙を窯前からセメントキルン内に投入する廃石膏ボード由来のボード紙の処理方法において、該ボード紙がキルン内の１１００℃の位置より川下側に落下するように調整して投入を行う前記方法である。
The present inventors have intensively studied to achieve the above object. Then, the present invention was completed focusing on that paper can be used as a heat source and gypsum can be used as a setting retarder in cement production .
That is, the present invention, after the gypsum board is separated into gypsum core material and the board paper, the method of processing board paper from waste gypsum board the board paper fed through pre-kiln in the cement kiln, the board paper kiln It is the said method adjusted so that it may fall downstream from the position of 1100 degreeC of the inside, and it is the said method input .
本発明によれば、今後大量に排出される可能性の高い廃石膏ボードから分離したボード紙を大量にリサイクル処理することが可能となり、その経済的効果および環境面における効果が極めて高い。また、セメント製造における廃棄物の有効利用にも寄する。 According to the present invention, it is possible to recycle a large amount of board paper separated from waste gypsum board which is likely to be discharged in large amounts in the future, and its economic and environmental effects are extremely high. It also contributes to the effective use of waste in cement production.
本発明において処理される紙は、石膏ボード廃材から分離されたボード紙である。石膏芯材とボード紙を分離する方法は特に限定されず、公知の方法を採用できる。例えば、石膏ボードを高速回転式衝撃破砕機、スクリューせん断式破砕機等を用いて、石膏芯材は粒径１５〜１００ｍｍ程度に、ボード原紙は５×１０−４〜０．０５ｍ２程度に予備破砕した後、ハンマーミル、ロールミル等を用いて、石膏芯材が、ボード紙から分離しやすい大きさになるまで破砕する。該石膏芯材の大きさは、例えば、２０ｍｍ以下、好ましくは１０ｍｍ以下の大きさまで破砕することが好ましい。そして、かかるボード紙は、振動式または回転式の篩により、石膏芯材と分離できる。かかる篩い目の大きさは、石膏芯材が通過でき、ボード紙が通過し得なない大きさを選択すればよい。 The paper treated in the present invention is board paper separated from gypsum board waste. The method for separating the gypsum core and the board is not particularly limited, and any known method can be employed. For example, using gypsum board as a high-speed rotary impact crusher, screw shear crusher, etc., the gypsum core material has a diameter of about 15 to 100 mm, and the base paper has a preliminary size of about 5 × 10 −4 to 0.05 m 2. After crushing, using a hammer mill, roll mill or the like, the gypsum core material is crushed until it is easily separated from the board paper. The size of the gypsum core is, for example, preferably crushed to a size of 20 mm or less, preferably 10 mm or less. Such board can then be separated from the gypsum core by means of a vibrating or rotating sieve. The size of the sieve may be selected so that the gypsum core can pass through and the board can not pass through.
上記方法で分離された紙は、特に更なる処理を施すことなく、セメントキルンに投入することができる。ここで用いられるセメントキルンは、周知のセメントキルンを用いることができ、ＳＰキルン、ＮＳＰキルン等が挙げられる。セメントキルンに投入することにより、ボード紙は燃焼し、セメントクリンカー焼成の際の熱源の一部として有効利用される。 The paper separated in the above manner can be introduced into the cement kiln without any further treatment. The cement kiln used here may be a known cement kiln, and examples include SP kiln, NSP kiln, and the like. By being put into the cement kiln, the board is burned and effectively used as part of a heat source during cement clinker firing.
本発明においては、上記ボード紙をセメントキルンに投入する際、窯前から投入することが重要である。なお窯前とは、セメントキルン内の物質の流れの川下側を指す。 In the present invention, when the board is put into a cement kiln, it is important to put the board from the front. In addition, weir refers to the downstream side of the material flow in the cement kiln.
周知の如く、セメントキルンで焼成・製造されたセメントクリンカーは、凝結遅延材として石膏が数％添加されてセメントとなる。本発明においては、上記石膏の一部をボード紙由来のものでまかなうものである。即ち、石膏ボードにおける石膏は数μｍ〜数十μｍの微少な針状石膏が複雑に絡み合ったものとなっている。従って、前記方法で石膏芯材と分離したボード紙には不可避的に少量の石膏が付着している。 As is well known, cement clinker fired and produced in a cement kiln is made into cement by adding a few percent of gypsum as a setting retarder. In the present invention, a part of the gypsum is covered with board paper. That is, the gypsum in the gypsum board is a complex entwined microneedle plaster of several μm to several tens of μm. Therefore, a small amount of gypsum inevitably adheres to the board paper separated from the gypsum core by the above method.
前記の通り、石膏が付着したボード紙はセメントキルン内に投入されることにより燃焼してしまうため、石膏分が残存するが、このボード紙の投入をプレヒーター、仮焼炉、窯尻ハウジングなどの窯尻側から行うとキルン内の移動に伴い最高で１４５０℃前後の高い温度にさらされるため、クリンカー原料中のアルカリ分と反応してアルカリ金属硫酸塩を生じ、石膏としての作用を奏さなくなるのみならず、出来上がったセメントがアルカリ−シリカ反応を起こす原因にもなりかねない。 As described above, since the gypsum-deposited board paper is burnt by being introduced into the cement kiln, the gypsum component remains, but the introduction of the board paper is made into a preheater, a calciner, a buttocks housing, etc. Because it is exposed to high temperature around 1450 ° C with the movement in the kiln when it is done from the side of the buttocks, it reacts with the alkali component in the clinker raw material to form an alkali metal sulfate and ceases to act as gypsum Not only that, the finished cement may also cause alkali-silica reaction.
それに対し、比較的キルン内温度の落ちている窯前から投入すれば、ボード紙に付着していた石膏は、石膏のまま（但し、二水石膏から無水石膏へは変換された状態で）製造されたクリンカー中に含まれることになり、その有用性が格段に高くなる。石膏をキルン内でアルカリ金属硫酸塩にしないためには、投入された石膏が、キルン内で１１００℃以下、好ましくは１０００℃以下、より好ましくは９００℃以下の位置より川下側に落下するように調整する。 On the other hand, if it is introduced from before the kiln where the temperature in the kiln is relatively low, the gypsum adhering to the board paper remains as gypsum (but in the state converted from dihydrate gypsum to anhydrous gypsum) It will be included in the clinker, and its usefulness will be much higher. In order to prevent the gypsum from becoming an alkali metal sulfate in the kiln, the introduced gypsum falls in the kiln downstream from the position of 1100 ° C. or less, preferably 1000 ° C. or less, more preferably 900 ° C. or less adjust.
本発明において、ボード紙のセメントキルン投入量は特に限定されるものではないが、一般的には、セメントキルンで製造されるクリンカー１トンに対して、１００ｋｇ以下が好ましい。 In the present invention, the amount of cement kiln input of the board is not particularly limited, but generally 100 kg or less is preferable to 1 ton of clinker produced in the cement kiln.
本発明において、セメントキルンで焼成・製造されたセメントクリンカーには上記の通り、ボード原紙に由来する石膏を含んでいるが、通常の凝結性能を有するセメントとするためには石膏分が足りない傾向があるため、さらに石膏（二水石膏や無水石膏）を添加する必要がある。セメントキルンで製造されたセメントクリンカーは、石膏を加える前、又は加えた後に、定法に従い粉砕され製品のセメントとできる。 In the present invention, as described above, the cement clinker fired and produced in a cement kiln contains gypsum derived from board base paper, but tends to be insufficient in gypsum content to obtain cement having normal setting performance. It is necessary to add gypsum (dihydrate gypsum and anhydrite) because of The cement clinker produced in the cement kiln can be ground according to a standard method to cement the product before or after adding gypsum.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000266328A (en) * | 1999-03-18 | 2000-09-29 | Taiheiyo Cement Corp | Method for incinerating paper contained in gypsum waste material |
| JP2003002705A (en) * | 2001-06-20 | 2003-01-08 | Mitsubishi Materials Corp | Waste gypsum material treatment method |
| JP4283701B2 (en) * | 2004-02-16 | 2009-06-24 | 三菱マテリアル株式会社 | Calcium sulfide manufacturing method, ground improvement material manufacturing method, and processing object processing method |
| JP2007216210A (en) * | 2005-10-12 | 2007-08-30 | Mitsubishi Materials Corp | Waste disposal method |
| JP4735438B2 (en) * | 2006-06-23 | 2011-07-27 | 宇部興産株式会社 | Anhydrous gypsum powder and method for producing the same |
| JP5183530B2 (en) * | 2009-03-10 | 2013-04-17 | 太平洋セメント株式会社 | Method for producing anhydrous gypsum powder |
| JP2011057465A (en) * | 2009-09-07 | 2011-03-24 | Taiheiyo Cement Corp | Quick lime production system and method of producing the same |
| JP2017057117A (en) * | 2015-09-17 | 2017-03-23 | 太平洋セメント株式会社 | Waste gypsum board processing method and processing apparatus |
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