JP4838413B2 - How to treat gypsum board waste - Google Patents
How to treat gypsum board waste Download PDFInfo
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- JP4838413B2 JP4838413B2 JP2000276364A JP2000276364A JP4838413B2 JP 4838413 B2 JP4838413 B2 JP 4838413B2 JP 2000276364 A JP2000276364 A JP 2000276364A JP 2000276364 A JP2000276364 A JP 2000276364A JP 4838413 B2 JP4838413 B2 JP 4838413B2
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- gypsum
- gypsum board
- paper
- cement clinker
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- 229910052602 gypsum Inorganic materials 0.000 title claims description 82
- 239000010440 gypsum Substances 0.000 title claims description 82
- 239000002699 waste material Substances 0.000 title claims description 36
- 239000004568 cement Substances 0.000 claims description 43
- 238000010304 firing Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 25
- 239000000446 fuel Substances 0.000 claims description 19
- 239000000725 suspension Substances 0.000 claims description 17
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 13
- 238000003672 processing method Methods 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 239000011505 plaster Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 238000000354 decomposition reaction Methods 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000006477 desulfuration reaction Methods 0.000 description 7
- 230000023556 desulfurization Effects 0.000 description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 150000004683 dihydrates Chemical class 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 238000000634 powder X-ray diffraction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 235000015173 baked goods and baking mixes Nutrition 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、石膏ボード廃材の石膏部分から、リサイクル無水石膏を回収する方法および同時に発生する石膏ボード廃材の紙部分の処理方法に関するものである。
【０００２】
【従来の技術】
石膏ボードは、建築内装材として、着実にその使用量を伸ばし、年間の使用量は、約５００万ｔに達している。最近では、老朽化したビルや住宅の解体などにより、石膏ボード廃材が大量に排出され、今後排出量は、さらに増大することが予想される。
【０００３】
石膏ボード廃材は、石膏ボードおよびセメント原料への再利用が期待されているが、ボード表面をおおう質量比７〜１０%の紙の混入が問題となる。
この紙の混入を防ぐ手段として、石膏ボード廃材の紙と石膏を機械的に分離し、二水石膏を回収する方法および石膏ボード廃材を焼成して、無水石膏を回収する方法がある。
【０００４】
前者の方法で回収した二水石膏は、セメント用の二水石膏として使用した場合、セメントの強度低下および凝結時間が遅延し、単味使用は不可能である。一方、分離した紙の処分も問題となる。
後者は、通常の手段で焼成すると、石膏ボード廃材の紙部分の燃焼により、紙周辺の石膏が分解し、大量のＳＯｘ発生が問題となる。
【０００５】
【発明が解決しようとする課題】
石膏ボード廃材から無水石膏を回収するために、石膏ボード廃材に含まれる紙部分を除去する手段として、焼成による方法が考えられるが、紙部分の燃焼により、紙周辺の石膏が一時的に高温にさらされるため、石膏の分解が起こり、大量のＳＯｘが発生する。
したがって本発明の目的は、石膏ボード廃材を石膏部分と紙部分とに分離し、それぞれ別々に処理することにより、上記の課題を解決しつつ、無水石膏を回収する方法を提供することである。
【０００６】
【課題を解決するための手段】
上述した本発明の目的は、
（１）サスペンションプレヒータとロータリーキルンを備えるセメントクリンカ焼成装置とセメントクリンカ焼成を利用した石膏ボード廃材の処理方法であって、前記石膏ボード廃材を石膏部分と紙部分とに分離後、前記石膏部分は前記ロータリーキルンで６００〜９００℃で焼成することにより無水石膏として回収し、前記紙部分はセメントクリンカ焼成時にセメント原料と同時焼成して処理することを特徴とする石膏ボード廃材の処理方法、
（２）サスペンションプレヒータとロータリーキルンを備えるセメントクリンカ焼成装置とセメントクリンカ焼成を利用した石膏ボード廃材の処理方法であって、前記石膏ボード廃材を石膏部分と紙部分とに分離後、前記石膏部分は前記ロータリーキルンで６００〜９００℃で焼成することにより無水石膏として回収し、前記紙部分はセメントクリンカ焼成における補助燃料としてキルンバーナから主燃料とともに前記ロータリーキルン内に吹き込んで処理することを特徴とする石膏ボード廃材の処理方法、
を確立したことにより達成される。
【０００７】
【発明実施の形態】
石膏ボード廃材は、ロール型クラッシャー等でせん断力を加えることにより、容易に石膏部分と紙部分とに分離することができ、この石膏部分から無水石膏を回収するためには、石膏の形態，粒度および燃焼時間によって異なるが、３５０〜４００℃以上での加熱が必要となる。
一方、加熱による石膏の分解は、約９５０℃から起こることが知られており、無水石膏を回収するためには、ロータリーキルンの焼成温度を６００〜９００℃の範囲に維持する必要がある。
【０００８】
しかしながら、石膏ボード廃材を石膏部分と紙部分とに分離せずに焼成した場合、紙部分の燃焼時に周辺の石膏が、一時的に１０００℃以上の雰囲気にさらされるため、ロータリーキルンの焼成温度を６００〜９００℃の範囲に維持していても、石膏の分解およびそれに起因するＳＯxの発生を避けることはできない。
【０００９】
石膏ボード廃材の紙部分の処理方法としては、紙部分のみをサスペンションプレヒータまたはロータリーキルンで焼成する方法およびセメントクリンカ焼成時にサスペンションプレヒータまたはロータリーキルンより給養する方法が挙げられる。
【００１０】
石膏ボード廃材の紙部分は、それ自体がＳ分をＳＯ２換算で約２５００ｍｇ／ｋｇ含有しているために、燃焼に伴うＳＯｘの発生を避けることはできず、前者の処理方法（紙部分のみの焼成）では、ＳＯｘの規制値以内となるように、処理量の調整，Ｓ分の少ない燃料の使用，脱硫設備の設置等を検討する必要がある。
【００１１】
一方、後者の処理方法（セメント原料との同時焼成）では、脱硫設備を設置する必要はない。これは、セメント原料の約６５%がＣａＣＯ３であるために、サスペンションプレヒータ内が、脱硫率９５%以上の有効な脱硫設備としての作用を持つためである。
【００１２】
サスペンションプレヒータ内でセメント原料に取り込まれたＳＯｘは、ロータリーキルンにおいて、セメント原料と共に約１４５０℃で焼成され、セメントクリンカ中では、硫酸アルカリとして存在する。
セメント製造工程において、ポルトランドセメントは、セメントクリンカに凝結調整剤として、二水石膏をＳＯ３量で１．５〜２．５％添加後、粉砕することにより、製造されるが、ＳＯｘ吸着に伴うセメントクリンカ中の硫酸アルカリもポルトランドセメント中では二水石膏と同様の働きをすることが知られており、ポルトランドセメントの品質に悪影響を及ぼさないばかりではなく、二水石膏の使用量削減に寄与する。
【００１３】
また、石膏ボード廃材の紙部分は、約１７０００ｋＪ／ｋｇの発熱量を持つために、補助燃料として、充分使用可能である。
紙部分を補助燃料として使用する場合には、キルンバーナーから主燃料とともにキルン内に吹き込むことが好ましく、燃焼効率を上げるためには、紙部分を２０ｍｍ角程度に破砕することがより好ましい。
【００１４】
このように本発明における、石膏ボード廃材中の紙部分の処理方法は、紙が本来持つ発熱量を補助燃料として利用し、さらにセメントクリンカ焼成時に処理する方法では、燃焼により発生したＳＯｘを硫酸アルカリとして、セメントクリンカ中に取り込み、ポルトランドセメントの凝結調整剤として、再利用するものである。
【００１５】
本発明において、紙部分をセメントクリンカ焼成時に処理する方法では、石膏ボード廃材は解砕の際に、石膏部分と紙部分とを完全に分離する必要はなく、紙に多少の石膏が付着していても問題はない。
これは、紙部分に残存する石膏もロータリーキルン内でセメントクリンカ中に取り込まれ、ポルトランドセメントの凝結調整剤として再利用されるためである。
また、石膏の分解よって発生したＳＯｘは、サスペンションプレヒータ内のセメント原料によって脱硫されるので問題はない。
【００１６】
一方、紙部分のみを焼成処理する方法では、ＳＯｘ発生量抑制のため、石膏部分と紙部分をできるだけ分離することが好ましく、処理の際には、残存石膏部分の分解に起因するＳＯｘの発生を考慮して、ＳＯｘの規制値以内となるように、処理量の調整，Ｓ分の少ない燃料の使用，脱硫設備の設置等を検討する必要がある。
【００１７】
【実施例】
以下、実施例に基づいて本発明を説明する。
石膏ボード廃材（厚さ９〜１２ｍｍ、紙の割合は７ｗｔ％）をロール型クラッシャーで解砕後、目開き１００ｍｍの振動篩で篩い分けすることにより、石膏部分（篩下）と紙部分（篩上）とに分離した。
【００１８】
上記分離品を本発明の方法を用いて、石膏部分については、１５ｔ／hの割合でサスペンションプレヒータ上部から給養し、ロータリーキルンにて焼成を行い（実施例１，２および比較例１）、紙部分については、セメントクリンカ焼成時に２t／hの割合でサスペンションプレヒータ最下段から給養し、処理を行った。
（実施例３）
また、比較として、ロール型クラッシャーで解砕のみを行った石膏ボード廃材を本発明の方法を用いて、１５ｔ／hの割合でサスペンションプレヒータ上部から給養し、ロータリーキルンにて焼成を行った。（比較例２，３）
【００１９】
焼成時には、サスペンションプレヒータ排気風車出口の風管部分において、排ガス中のＳＯ２濃度を測定するとともに、実施例１，２および比較例１〜３においては、グレードクーラ出口にて、焼成品のサンプリングを行った。
また、上記焼成品については、１５０μmアンダーとなるまで粉砕し、粉末X線回折による石膏形態の確認、および「ＣＡＪＳ １−０１（セメント協会標準試験方法）」の規定にしたがって、遊離カルシウム量の測定を行った。
表１に焼成時のＳＯ２発生量および焼成品の遊離カルシウム量測定結果を示す。
【００２０】
なお、ＳＯ２発生量において、「測定値」とは、サスペンションプレヒータ排気風車出口の風管部分において、実測した値であり、「燃料」とは、燃料として使用した、重油中のＳ含有量（０．５％）と焼成時の燃料使用量および排ガス量から算出した、燃料に起因する理論上のＳＯ２発生量であり、「給養物」とは、「測定値」から「燃料」を差し引いた値、すなわち、給養物の燃焼に起因すると考えられるＳＯ２発生量である。
【００２１】
【表１】
実施例１，２および比較例１〜３の焼成品を粉末X線回折で確認したところ、比較例２以外は、全て無水石膏であり、比較例２については、その殆どが無水石膏であったが、極微量の半水石膏も含まれていた。
【００２３】
焼成品の遊離カルシウム量は、石膏の分解によって生成された酸化カルシウム量を示しており、石膏ボード廃材焼成中の石膏の分解に起因するＳＯｘ発生量を知る目安となる。
【００２４】
実施例１，２の焼成品の遊離カルシウム量は、０%であり、本発明による焼成方法および焼成温度では、石膏の分解がほとんど起こっていないことが判る。
しかし、本発明の温度範囲を外れている、比較例１および石膏部分と紙部分との分離を行っていない、比較例２，３では、石膏の分解が起こっており、石膏の分解による相当量のＳＯｘの発生が考えられる。
【００２５】
実施例１，２の焼成時に、サスペンションプレヒータ排気風車出口の風管部分において、測定した排ガス中のＳＯ２は、その全てが燃料に起因するものであり、焼成品の遊離カルシウム量測定結果と良く一致している。
また、本発明の温度範囲を外れている比較例１では、石膏の分解に伴うＳＯ２の発生が、比較例２，３では、石膏の分解および紙の燃焼に伴うＳＯ２の発生がみられる。
【００２６】
一方、紙部分をセメントクリンカ焼成時に、セメントクリンカ焼成用のサスペンションプレヒータの最下段部より給養する処理方法（実施例３）では、燃料および紙の燃焼に伴い発生するＳＯ２の大部分が、プレヒータ内でセメント原料中のＣａＣＯ３により、脱硫されていることが判る。
【００２７】
上記表１から、本発明における、石膏ボード廃材石膏部分の焼成方法（実施例１，２）は、石膏を分解させることなく、無水石膏を回収できることができ、焼成時に発生するＳＯｘは、燃料に起因するものだけであり、ＬＮＧのように、Ｓ分を含まない燃料を使用すれば、焼成中にＳＯｘの発生は無い。
【００２８】
また、紙部分をセメントクリンカ焼成時に処理する方法（実施例３）では、燃焼による処理の際、ＳＯｘの発生が免れない石膏ボード廃材の紙部分をセメントクリンカ焼成時に、セメントクリンカ焼成用のサスペンションプレヒータの最下段部から給養することにより、セメント原料が発生したＳＯｘの９５%以上を脱硫する。
【００２９】
したがって、本発明の石膏焼成方法は、ＳＯｘの発生を抑制しつつ、リサイクル無水石膏の回収が可能であり、脱硫設備を持たないセメント工場においては、紙部分の処理をセメントクリンカ焼成時に行うことにより、石膏ボード廃材の処理とリサイクル無水石膏の回収とを環境に負荷をかけること無く行えることは、明らかである。
【００３０】
【発明の効果】
本発明は、以上詳記したように、石膏ボード廃材を石膏部分と紙部分とに分離し、それぞれ別々に焼成および処理することにより、石膏ボード廃材の大量処理とセメント原料への再利用が可能となり、廃棄物処理に量的質的に多大に貢献をする点、および石膏の分解によるＳＯｘ発生の抑制が出来るため、環境低負荷型の焼成方法である点など、本発明の効果は極めて大きい。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for recovering recycled anhydrous gypsum from a gypsum part of gypsum board waste material and a method for treating a paper part of gypsum board waste material generated at the same time.
[0002]
[Prior art]
Gypsum board has steadily increased its usage as a building interior material, and the annual usage has reached about 5 million tons. Recently, due to the dismantling of aging buildings and houses, a large amount of gypsum board waste has been discharged, and the amount of discharge is expected to increase further in the future.
[0003]
Gypsum board waste material is expected to be reused for gypsum board and cement raw materials, but mixing of paper with a mass ratio of 7 to 10% covering the board surface becomes a problem.
As means for preventing the paper from being mixed, there are a method of mechanically separating gypsum board waste paper and gypsum to recover dihydrate gypsum and a method of baking gypsum board waste to recover anhydrous gypsum.
[0004]
When dihydrate gypsum recovered by the former method is used as dihydrate gypsum for cement, the strength reduction of the cement and the setting time are delayed, and simple use is impossible. On the other hand, disposal of the separated paper is also a problem.
When the latter is fired by ordinary means, the gypsum around the paper is decomposed due to the burning of the paper portion of the gypsum board waste material, and a large amount of SOx is generated.
[0005]
[Problems to be solved by the invention]
In order to recover anhydrous gypsum from gypsum board waste, firing can be considered as a means of removing the paper part contained in gypsum board waste, but the gypsum around the paper temporarily becomes hot due to the burning of the paper part. As a result, the gypsum is decomposed and a large amount of SOx is generated.
Accordingly, an object of the present invention is to provide a method for recovering anhydrous gypsum while solving the above-mentioned problems by separating the gypsum board waste material into a gypsum part and a paper part and treating them separately.
[0006]
[Means for Solving the Problems]
The object of the present invention described above is
(1) A processing method of plasterboard waste using cement clinker burning apparatus and the cement clinker burning comprising a suspension preheater and a rotary kiln, after separating the gypsum board wastes into a plaster part and the paper portion, said plaster part the and collected as a by Rina water gypsum to calcined at 600 to 900 ° C. in a rotary kiln, the paper portion processing method for gypsum board wastes, which comprises cement material fired simultaneously and processed at the time the cement clinker burning,
(2) A cement clinker firing apparatus including a suspension preheater and a rotary kiln and a method for treating gypsum board waste using cement clinker firing, wherein the gypsum part is separated into a gypsum part and a paper part, It is recovered as anhydrous gypsum by firing at 600 to 900 ° C. in a rotary kiln, and the paper part is treated by blowing into the rotary kiln together with main fuel from a kiln burner as an auxiliary fuel in cement clinker firing. Processing method,
This is achieved by establishing
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Gypsum board waste can be easily separated into gypsum and paper by applying shear force with a roll crusher, etc. In order to recover anhydrous gypsum from this gypsum, Depending on the combustion time, heating at 350 to 400 ° C. or higher is required.
On the other hand, it is known that decomposition of gypsum by heating occurs from about 950 ° C., and in order to recover anhydrous gypsum, it is necessary to maintain the firing temperature of the rotary kiln in the range of 600 to 900 ° C.
[0008]
However, when the gypsum board waste material is fired without being separated into a gypsum part and a paper part, the surrounding gypsum is temporarily exposed to an atmosphere of 1000 ° C. or higher when the paper part is burned, and therefore the firing temperature of the rotary kiln is set to 600. Even if it is maintained in the range of ˜900 ° C., decomposition of gypsum and generation of SOx resulting therefrom cannot be avoided.
[0009]
Examples of the method for treating the paper part of the gypsum board waste material include a method in which only the paper part is fired with a suspension preheater or a rotary kiln, and a method in which the paper is fed from the suspension preheater or the rotary kiln at the time of cement clinker firing.
[0010]
Since the paper part of the gypsum board waste material itself contains about 2500 mg / kg of S in terms of SO 2 , generation of SOx due to combustion cannot be avoided, and the former processing method (only the paper part) ), It is necessary to consider the adjustment of the processing amount, the use of fuel with a small amount of S, the installation of a desulfurization facility, etc. so as to be within the SOx regulation value.
[0011]
On the other hand, in the latter treatment method (simultaneous firing with cement raw material), it is not necessary to install a desulfurization facility. This is because approximately 65% of the cement raw material is CaCO 3 , so that the suspension preheater has an effect as an effective desulfurization facility having a desulfurization rate of 95% or more.
[0012]
The SOx taken into the cement raw material in the suspension preheater is fired at about 1450 ° C. together with the cement raw material in the rotary kiln and exists as an alkali sulfate in the cement clinker.
In the cement production process, Portland cement, a condensation modifier cement clinker, after adding 1.5 to 2.5% of gypsum with SO 3 content, by grinding, are produced, due to the SOx adsorption Alkaline sulfate in cement clinker is known to work in the same way as dihydrate gypsum in Portland cement, and not only does not adversely affect the quality of Portland cement, but also contributes to reducing the amount of dihydrate gypsum used. .
[0013]
Further, since the paper portion of the gypsum board waste material has a calorific value of about 17000 kJ / kg, it can be sufficiently used as an auxiliary fuel.
When using a paper part as auxiliary fuel, it is preferable to blow into the kiln together with the main fuel from the kiln burner, and in order to increase combustion efficiency, it is more preferable to crush the paper part to about 20 mm square.
[0014]
Thus, in the present invention, the method for treating the paper portion in the gypsum board waste material uses the calorific value inherent in the paper as an auxiliary fuel, and in the method of treating at the time of cement clinker firing, the SOx generated by combustion is alkali sulfate. Incorporated into a cement clinker and reused as a setting modifier for Portland cement.
[0015]
In the present invention, in the method of treating the paper part during cement clinker firing, it is not necessary to completely separate the gypsum board part from the paper part when the gypsum board waste material is crushed, and some gypsum adheres to the paper. There is no problem.
This is because gypsum remaining in the paper portion is also taken into the cement clinker in the rotary kiln and reused as a setting regulator for Portland cement.
Moreover, since SOx generated by the decomposition of gypsum is desulfurized by the cement raw material in the suspension preheater, there is no problem.
[0016]
On the other hand, in the method of firing only the paper part, it is preferable to separate the gypsum part and the paper part as much as possible in order to suppress the amount of SOx generated. In consideration of this, it is necessary to consider the adjustment of the processing amount, the use of fuel with a small amount of S, the installation of a desulfurization facility, etc. so that it is within the SOx regulation value.
[0017]
【Example】
Hereinafter, the present invention will be described based on examples.
The gypsum board waste (thickness 9-12mm, paper percentage is 7wt%) is crushed with a roll crusher and then sieved with a vibrating sieve with 100mm mesh opening, so that the gypsum part (under sieve) and paper part (sieving To the above).
[0018]
Using the method of the present invention, the separated product is fed from the top of the suspension preheater at a rate of 15 t / h and fired in a rotary kiln (Examples 1 and 2 and Comparative Example 1). As for, the cement clinker was fired at the rate of 2 t / h from the bottom of the suspension preheater and processed.
(Example 3)
As a comparison, the gypsum board waste material that was only crushed with a roll crusher was fed from the top of the suspension preheater at a rate of 15 t / h using the method of the present invention, and baked in a rotary kiln. (Comparative Examples 2 and 3)
[0019]
At the time of firing, the SO 2 concentration in the exhaust gas is measured at the wind tube portion at the exit of the suspension preheater exhaust wind turbine, and in Examples 1 and 2 and Comparative Examples 1 to 3, sampling of the fired product is performed at the grade cooler exit. went.
Moreover, about the said baked goods, it grind | pulverizes until it becomes under 150 micrometers, the confirmation of the gypsum form by powder X-ray diffraction, and the measurement of the amount of free calcium according to the prescription | regulation of "CAJS 1-01 (cement association standard test method)" Went.
Table 1 shows the amount of SO 2 generated during firing and the result of measuring the amount of free calcium in the fired product.
[0020]
In the SO 2 generation amount, the “measured value” is a value actually measured in the wind pipe portion at the exit of the suspension preheater exhaust wind turbine, and the “fuel” is the S content in heavy oil used as fuel ( 0.5%) and the theoretical amount of SO 2 generated from the fuel, calculated from the amount of fuel used during firing and the amount of exhaust gas. “Supplied food” is the “measured value” minus “fuel” Value, that is, the amount of SO 2 generated that is considered to be caused by combustion of the feed.
[0021]
[Table 1]
When the fired products of Examples 1 and 2 and Comparative Examples 1 to 3 were confirmed by powder X-ray diffraction, all except for Comparative Example 2 was anhydrous gypsum, and most of Comparative Example 2 was anhydrous gypsum. However, a trace amount of hemihydrate gypsum was also included.
[0023]
The amount of free calcium in the calcined product indicates the amount of calcium oxide produced by the decomposition of gypsum, and it is a standard for knowing the amount of SOx generated due to the decomposition of gypsum during gypsum board waste material firing.
[0024]
The amount of free calcium of the calcined products of Examples 1 and 2 is 0%, and it can be seen that the gypsum is hardly decomposed by the calcining method and calcining temperature according to the present invention.
However, in Comparative Example 1 and Comparative Examples 2 and 3 in which the gypsum part and the paper part are not separated, which is outside the temperature range of the present invention, the gypsum was decomposed and a considerable amount due to the decomposition of gypsum. The generation of SOx can be considered.
[0025]
At the time of firing in Examples 1 and 2, the SO 2 in the exhaust gas measured in the wind tube portion at the exit of the suspension preheater exhaust wind turbine is entirely attributable to the fuel, which is good with the result of measuring the amount of free calcium in the fired product. Match.
In Comparative Example 1 outside the temperature range of the present invention, SO 2 is generated due to decomposition of gypsum, and in Comparative Examples 2 and 3, SO 2 is generated due to decomposition of gypsum and paper combustion. .
[0026]
On the other hand, in the treatment method (Example 3) in which the paper portion is fed from the lowermost stage of the suspension preheater for cement clinker firing when the cement clinker is fired, most of the SO 2 generated by the combustion of the fuel and paper is preheater. It can be seen that desulfurization is caused by CaCO 3 in the cement raw material.
[0027]
From Table 1 above, the method for calcining gypsum board waste material gypsum part (Examples 1 and 2) in the present invention can recover anhydrous gypsum without decomposing gypsum, and SOx generated at the time of firing is used as fuel. This is only due to the fact that if a fuel that does not contain S, such as LNG, is used, SOx is not generated during firing.
[0028]
Further, in the method of treating the paper portion during cement clinker firing (Example 3), the suspension preheater for cement clinker firing is performed during the cement clinker firing of the paper portion of the gypsum board waste material in which generation of SOx is unavoidable during the treatment by combustion. By feeding from the lowermost stage, 95% or more of the SOx generated from the cement raw material is desulfurized.
[0029]
Therefore, the gypsum firing method of the present invention can recover recycled anhydrous gypsum while suppressing the generation of SOx, and in a cement factory without a desulfurization facility, the paper portion is processed at the time of cement clinker firing. It is clear that the treatment of gypsum board waste and the recovery of recycled anhydrous gypsum can be performed without placing an environmental burden.
[0030]
【The invention's effect】
As described in detail above, the present invention can separate a gypsum board waste material into a gypsum part and a paper part, and separately fire and process the gypsum board waste material, thereby enabling mass treatment of the gypsum board waste material and reuse it as a cement raw material. Thus, the effect of the present invention is extremely large, such as the fact that it contributes greatly to the waste treatment quantitatively and qualitatively, and the SOx generation due to the decomposition of gypsum can be suppressed. .
Claims (2)
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| JP2000276364A JP4838413B2 (en) | 2000-09-12 | 2000-09-12 | How to treat gypsum board waste |
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| JP2000276364A JP4838413B2 (en) | 2000-09-12 | 2000-09-12 | How to treat gypsum board waste |
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| FR3141937A1 (en) * | 2022-11-16 | 2024-05-17 | Holding Ritleng | Process for recovering plaster waste and installation for implementing such a process |
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| JP4573553B2 (en) * | 2004-03-29 | 2010-11-04 | 有限会社アドセラミックス研究所 | Gypsum production equipment |
| JP4620485B2 (en) * | 2005-02-17 | 2011-01-26 | 住友大阪セメント株式会社 | Anhydrous gypsum production method and production equipment |
| JP2006327859A (en) * | 2005-05-25 | 2006-12-07 | Fujitekku:Kk | Firing equipment |
| JP5230140B2 (en) * | 2007-08-09 | 2013-07-10 | 株式会社トクヤマ | Method for producing dihydrate gypsum |
| JP2009190920A (en) * | 2008-02-13 | 2009-08-27 | Technica:Kk | Apparatus for recycling gypsum and rotary kiln furnace |
| JP2010194452A (en) * | 2009-02-25 | 2010-09-09 | Babcock Hitachi Kk | Method of manufacturing catalyst for nitrogen oxide removal using waste gypsum board |
| JP6598373B2 (en) * | 2016-03-10 | 2019-10-30 | 太平洋セメント株式会社 | Waste gypsum board processing method and processing apparatus |
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| JP3221940B2 (en) * | 1992-11-12 | 2001-10-22 | 吉野石膏株式会社 | How to recover gypsum from gypsum board waste |
| JP3624031B2 (en) * | 1995-08-30 | 2005-02-23 | 太平洋セメント株式会社 | Composite disintegration processing method and disintegration processing apparatus |
| JPH1045442A (en) * | 1996-07-29 | 1998-02-17 | Chichibu Onoda Cement Corp | Cement composition and method for producing the same |
| JPH1045446A (en) * | 1996-07-29 | 1998-02-17 | Chichibu Onoda Cement Corp | Production of anhydrous gypsum ii and cement |
| JPH10230242A (en) * | 1996-12-19 | 1998-09-02 | Yoshino Sekko Kk | Gypsum board waste material treatment method and apparatus |
| JPH1119527A (en) * | 1997-07-03 | 1999-01-26 | Synx Kk | Crushing treatment device for waste material of gypsum plaster board |
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| FR3141937A1 (en) * | 2022-11-16 | 2024-05-17 | Holding Ritleng | Process for recovering plaster waste and installation for implementing such a process |
| WO2024105163A1 (en) * | 2022-11-16 | 2024-05-23 | Holding Ritleng | Method for recycling plaster waste and facility for implementing such a method |
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