JPH06142633A - Method for recovering plaster from waste material of plasterboard - Google Patents
Method for recovering plaster from waste material of plasterboardInfo
- Publication number
- JPH06142633A JPH06142633A JP4302299A JP30229992A JPH06142633A JP H06142633 A JPH06142633 A JP H06142633A JP 4302299 A JP4302299 A JP 4302299A JP 30229992 A JP30229992 A JP 30229992A JP H06142633 A JPH06142633 A JP H06142633A
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- gypsum board
- waste material
- plasterboard
- base paper
- 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.)
- Granted
Links
- 239000002699 waste material Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000011505 plaster Substances 0.000 title abstract description 5
- 229910052602 gypsum Inorganic materials 0.000 claims description 80
- 239000010440 gypsum Substances 0.000 claims description 80
- 239000010893 paper waste Substances 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 abstract description 20
- 238000010000 carbonizing Methods 0.000 abstract description 2
- 238000003672 processing method Methods 0.000 abstract description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 12
- 239000011162 core material Substances 0.000 description 6
- 238000012937 correction Methods 0.000 description 6
- 239000002440 industrial waste Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 150000004683 dihydrates Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、石膏ボードの廃材から
石膏を回収する方法、特に石膏ボードの廃材の処理に適
した方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering gypsum from a waste material of gypsum board, and more particularly to a method suitable for treating the waste material of gypsum board.
【０００２】[0002]
【従来の技術】近年、石膏ボードは防耐火性、遮音性等
を有し経済的であることから建築用資材として多用され
ている。このような石膏ボードは石膏を主体とする芯材
を石膏ボード用原紙で被覆した板状の構造となってお
り、製品厚さ１２mmの石膏ボードでは石膏量約９３重量
％（以下、％と略称する。）、原紙量約７％の割合で構
成されている。この石膏ボードは建築物のいたるところ
に使用されており、建築現場においては、使用部位の寸
法に合せて切断された残りの端材や塊状又は粉状の屑
（以下、廃材という）が発生している。その廃材の発生
量は使用量の約１０％強とも云われ、石膏ボードの年間
使用量が約５００万トンであることを考えると約５０万
トン前後の石膏ボードの廃材が産業廃棄物として発生し
ており、他の産業廃棄物同様埋め立て等により処分され
ている。一方、産業廃棄物の埋め立て等による処分は環
境上及びその他のことから社会的に問題化され、資源に
乏しい我が国では「再生資源の利用の促進に関する法律
（リサイクル法）」が平成３年４月に公布されて同年１
０月に施行されている。また、他の産業廃棄物の一部は
既に基本的に製造者負担とする法規制下にあり、有効に
再利用できる産業廃棄物の処理法の開発が進められてい
る。このような状況下で、建築現場等から生ずる石膏ボ
ードの廃材も例に漏れず、該廃材を産業廃棄物として処
分することがなく有効に利用できる処理方法の開発が切
望されている。2. Description of the Related Art In recent years, gypsum board has been widely used as a construction material because it is economical because it has fireproofness and sound insulation. Such a gypsum board has a plate-like structure in which a gypsum-based core material is coated with a gypsum board base paper, and a gypsum board with a product thickness of 12 mm has a gypsum amount of about 93% by weight (hereinafter, abbreviated as%). , And the amount of base paper is about 7%. This gypsum board is used everywhere in the building, and at the construction site, the remaining scraps and lumps or powdery scraps (hereinafter referred to as waste materials) cut according to the size of the used site are generated. ing. It is said that the amount of waste material generated is more than about 10% of the amount used, and considering that the annual amount of gypsum board used is about 5 million tons, about 500,000 tons of gypsum board waste materials are generated as industrial waste. It is disposed of by landfill, etc. like other industrial waste. On the other hand, disposal of industrial waste by landfill, etc. has become a social problem from the environmental and other viewpoints, and in Japan where resources are scarce, the "Act on Promotion of Utilization of Recycled Resources (Recycling Law)" was issued in April 1991. Was promulgated in 1
It came into effect in January. In addition, a part of other industrial waste is already under the legal regulation that the manufacturer basically bears it, and the development of a method for treating industrial waste that can be effectively reused is underway. Under such circumstances, waste materials of gypsum board generated from construction sites, etc. are not leaked as an example, and development of a treatment method that can be effectively used without disposing of the waste materials as industrial waste has been earnestly desired.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、建築現場そ
の他で発生する石膏ボードの廃材を有効に再利用できる
処理方法を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a processing method capable of effectively reusing the waste material of gypsum board generated at a construction site or the like.
【０００４】[0004]
【課題を解決するための手段】本発明は、石膏ボードの
廃材を高温に加熱して原紙を炭化させると、残った石膏
は石膏ボードの製造等に有効に使用できるとの知見に基
づいてなされたものである。すなわち、本発明は、石膏
ボード芯の少なくとも一部に石膏ボード用原紙が付着し
てなる石膏ボードの廃材を加熱して石膏ボード用原紙を
炭化させることを特徴とする石膏ボードの廃材から石膏
を回収する方法を提供する。本発明の方法を施す対象と
なる石膏ボードは、一般に、石膏芯の回りを石膏ボード
用原紙（以下、原紙という）で被覆した形態にあり、そ
の廃材の形状は板状、塊状または粉状である。特に、板
状や塊状の場合には、均一に加熱できる大きさにするた
めに加熱工程のまえに破砕工程を設けることができる。
そのときの破砕の度合いは、原紙の石膏芯との接着面に
石膏が付着又は一部密着した状態のままであってもよ
く、石膏芯が均一に加熱できる粒径であればよい。好ま
しくは１０mm以下である。この際、破砕品をふるいにか
け、ふるいを通過した石膏（二水石膏）粉を回収して原
料として利用し、ふるい上に残った石膏が付着した原紙
のみを、本発明の加熱工程に送ることができ、このよう
な工程を採用すると、石膏ボードの廃材の処理効率を大
幅に向上させることができる。そして、加熱工程後に回
収する加熱品は水和する焼石膏として石膏ボード等の原
材料として利用できる。尚、上記記載の破砕方法は、通
常の圧縮、衝撃、剪断、摩擦及び切断によるものでよ
く、特に限定されない。また、分離法は乾式であれば何
でもよく、例えば振動篩や回転篩が挙げられる。The present invention has been made based on the finding that when the waste material of gypsum board is heated to a high temperature to carbonize the base paper, the remaining gypsum can be effectively used for the production of gypsum board and the like. It is a thing. That is, the present invention, the gypsum from the waste material of the gypsum board characterized by heating the waste material of the gypsum board base material for gypsum board is attached to at least a part of the gypsum board core to carbonize the gypsum board raw paper. Provide a method of collection. The gypsum board to be subjected to the method of the present invention is generally in a form in which the gypsum core is covered with a gypsum board base paper (hereinafter referred to as a base paper), and the shape of the waste material is a plate shape, a lump shape, or a powder shape. is there. In particular, in the case of a plate shape or a lump shape, a crushing step can be provided before the heating step in order to make the size uniform.
The degree of crushing at that time may be such that the gypsum is still attached or partially adhered to the adhesive surface of the base paper with the gypsum core, as long as the gypsum core can be uniformly heated. It is preferably 10 mm or less. At this time, the crushed product is sifted, the gypsum (dihydrate gypsum) powder that has passed through the sieve is recovered and used as a raw material, and only the base paper with the gypsum remaining on the sieve is sent to the heating step of the present invention. By adopting such a process, the processing efficiency of the waste material of the gypsum board can be greatly improved. The heated product recovered after the heating step can be used as a raw material such as gypsum board as hydrated gypsum. The crushing method described above may be any of ordinary compression, impact, shearing, friction and cutting, and is not particularly limited. The separation method may be any dry method, and examples thereof include a vibrating screen and a rotary screen.
【０００５】本発明における加熱方法としては、直接加
熱や間接加熱法が挙げられるが、加熱温度としては原紙
を炭化させ得る温度であればよい。その温度は再利用の
用途によっても異なるが、得られる石膏を水和させて使
用する場合には、石膏ボードの廃材を２４０〜３６０℃
（好ましい温度範囲は２８０〜３２０℃）で加熱するの
がよい。尚、３６０℃を越えるとそのままでは水和しな
いII型無水石膏が多量に発生し用途先が限定されるので
好ましくない。尚、この温度範囲で廃材を加熱すると石
膏ボードを構成する原紙は炭化し、石膏（二水石膏）は
脱水し可溶性のIII 型無水石膏になる。この可溶性のII
I 型無水石膏には多少の水和しないII型無水石膏を含む
ことができる。上記加熱時間は任意とすることができる
が、0.５〜５時間、好ましくは１〜４時間とするのがよ
い。Examples of the heating method in the present invention include a direct heating method and an indirect heating method. The heating temperature may be any temperature at which the base paper can be carbonized. The temperature varies depending on the purpose of reuse, but when the obtained gypsum is hydrated and used, the waste material of the gypsum board is 240 to 360 ° C.
It is preferable to heat at (a preferable temperature range is 280 to 320 ° C.). If the temperature exceeds 360 ° C., a large amount of type II anhydrous gypsum that is not hydrated as it is is generated and the intended use is limited, which is not preferable. When the waste material is heated in this temperature range, the base paper constituting the gypsum board is carbonized and the gypsum (dihydrate gypsum) is dehydrated to become soluble type III anhydrous gypsum. This soluble II
Type I anhydrous gypsum can include some type II anhydrous gypsum that does not hydrate. The heating time may be arbitrary, but it is 0.5 to 5 hours, preferably 1 to 4 hours.
【０００６】また、得られる石膏を単に増量材として、
或はアルカリ剤の存在下で水和させて再利用する場合に
は、石膏ボードの廃材を３６０℃以上で、好ましくは３
６０〜６００℃で加熱して原紙を炭化させ脱水した石膏
の殆どがII型無水石膏とすることもできるし、原紙を燃
焼させて石膏をII型無水石膏とすることもできる。この
場合にも、加熱時間は任意とすることができるが、0.１
〜３時間、好ましくは0.５〜１時間とするのがよい。高
温加熱前の廃材の破砕が充分でなく塊状であると、原紙
の炭化後でもIII 型無水石膏が塊状のまま残ることがあ
るので容易に再利用できるように高温加熱後に粉砕工程
を設けることができる。この場合の粉砕も、上述した破
砕と同様の条件で行うことができる。本発明では、上記
方法により回収した石膏（III 型無水石膏）を単独で石
膏芯として使用することもでき、又、通常の焼石膏と混
合して使用することもできる。Further, the obtained gypsum is simply used as an extender,
Alternatively, when hydrated in the presence of an alkaline agent for reuse, the waste material of the gypsum board is kept at 360 ° C or higher, preferably 3
Most of the gypsum obtained by carbonizing and dehydrating the base paper by heating at 60 to 600 ° C can be used as type II anhydrous gypsum, or the base paper can be burned to form gypsum type II anhydrous gypsum. Also in this case, the heating time can be arbitrary, but 0.1
~ 3 hours, preferably 0.5 to 1 hour. If the waste material is not sufficiently crushed before heating at high temperature and is in a lump form, the type III anhydrous gypsum may remain in a lump even after carbonization of the base paper.Therefore, a crushing step should be provided after heating at a high temperature for easy reuse. it can. The crushing in this case can also be performed under the same conditions as the crushing described above. In the present invention, the gypsum (Type III anhydrous gypsum) recovered by the above method can be used alone as a gypsum core, or can be used as a mixture with ordinary calcined gypsum.
【０００７】[0007]
【発明の効果】本発明によれば、石膏ボードの廃材を高
温で加熱すると石膏ボード用原紙は炭化するので、残っ
た石膏の加熱品は水和硬化する焼石膏として広く利用で
き、多量の石膏ボードの廃材を有効に活用できる。次
に、本発明を実施例を用いて説明する。According to the present invention, when the waste material of the gypsum board is heated at a high temperature, the base paper for the gypsum board is carbonized. Therefore, the heated product of the remaining gypsum can be widely used as hydration-cured calcined gypsum and a large amount of gypsum. You can effectively use the waste materials of the board. Next, the present invention will be described using examples.
【０００８】[0008]
実施例１ 石膏ボードの廃材（厚さ１２mmの石膏ボードの端材、原
紙は全体の約７％）を破砕機により破砕し、９mm目篩を
パスした石膏ボードの破砕品を得た。この破砕品１０kg
（原紙の量約７００g ）を撹拌機付き間接伝熱竪釜石膏
加熱装置により加熱し原紙を炭化させた。このときの加
熱時間は１８０分で焼き上げ温度は３００℃であった。
この加熱品の石膏部分をＸ線回析で確認したところ、二
水石膏及びII型無水石膏はなく全てIII 型無水石膏であ
った。塊状のものも含め7.２kgの加熱品を得た。この加
熱品を２５mmφ鉄球４０kg入りのボールミル（容量２4
l、回転数６０rpm ）で１０分間粉砕した。この粉砕に
より塊状の加熱品はすべて粉末となった。次に、上記粉
末加熱品（以下、３００℃加熱品と称す）を通常の石膏
ボード用焼石膏に配合し作成した厚さ１２mmの石膏ボー
ドについて、ＪＩＳＡ−６９０１に基づき曲げ試験と剥
離試験を行った。表−１に結果を示す。Example 1 Gypsum board waste material (12 mm-thick gypsum board end material, about 7% of the total base paper) was crushed by a crusher to obtain a crushed gypsum board product that passed through a 9 mm sieve. This crushed product 10kg
(The amount of base paper was about 700 g) was heated by an indirect heat transfer vertical gypsum heating device equipped with a stirrer to carbonize the base paper. The heating time at this time was 180 minutes, and the baking temperature was 300 ° C.
When the gypsum portion of this heated product was confirmed by X-ray diffraction, it was found that there was no dihydrate gypsum and type II anhydrous gypsum, and all was type III anhydrous gypsum. 7.2 kg of heated products including lumpy ones were obtained. This heated product is a ball mill (capacity 24
Milling was carried out for 10 minutes at a rotation speed of 60 rpm. By this pulverization, all the lump-shaped heated products became powder. Next, a bending test and a peeling test were performed based on JISA-6901 for a 12 mm-thick gypsum board prepared by mixing the above-mentioned powder heated product (hereinafter referred to as 300 ° C. heated product) with ordinary gypsum board plaster. It was The results are shown in Table-1.
【０００９】[0009]
【表１】 表−１ ──────────────────────────────────── 焼石膏の配合比（重量部） 石膏ボード 曲げ破壊荷重 耐剥離性 通常の焼石膏 300℃加熱品 の比重 kgf ──────────────────────────────────── １００ ０ 0.７１ ６０ いずれも ────────────────────────────── 石膏と原 ９０ １０ 0.７２ ６１ 紙の剥離 ────────────────────────────── なし ８０ ２０ 0.７１ ６０ ──────────────────────────────────── ０ １００ 0.７２ ６０ ──────────────────────────────────── 本発明の方法により得られた３００℃加熱品を配合した
ものは、通常の焼石膏単独使用の場合と比べて、曲げ破
壊荷重及び耐剥離性は何ら劣るものでなかった。尚、こ
の時の焼石膏の混水量及び凝結時間にも変化は見られな
かった。[Table 1] Table-1 ──────────────────────────────────── Mixing ratio of calcined gypsum (weight Part) Gypsum board Bending fracture load Delamination resistance Specific gravity of normal calcined gypsum 300 ℃ heated product kgf ─────────────────────────────── ─────── 100 0 0.71 60 All ────────────────────────────── Plaster and raw 90 10 0.72 61 Peeling of paper ────────────────────────────── None 80 20 0.71 60 ─────── ────────────────────────────── 0 100 0.72 60 ─────────────── ────────────────────── 300 ℃ heating obtained by the method of the present invention Those formulated with, as compared with the case of ordinary calcined gypsum used alone, bending fracture load and peel resistance was not in any way inferior. No change was observed in the amount of water mixed with calcined gypsum and the setting time.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年１２月１６日[Submission date] December 16, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００８[Correction target item name] 0008
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００８】[0008]
【実施例】 実施例１ 石膏ボードの廃材（厚さ１２ｍｍの石膏ボードの端材、
原紙は全体の約７％）を破砕機により破砕し、９ｍｍ目
篩をパスした石膏ボードの破砕品を得た。この破砕品１
０ｋｇ（原紙の量約７００ｇ）を撹拌機付き間接伝熱竪
釜石膏加熱装置により加熱し原紙を炭化させた。このと
きの加熱時間は１８０分で焼き上げ温度は３００℃であ
った。この加熱品の石膏部分をＸ線回折で確認したとこ
ろ、二水石膏及びＩＩ型無水石膏はなく全てＩＩＩ型無
水石膏であった。塊状のものも含め７．２ｋｇの加熱品
を得た。この加熱品を２５ｍｍφ鉄球４０ｋｇ入りのボ
ールミル（容量２４ｌ、回転数６０ｒｐｍ）で１０分間
粉砕した。この粉砕により塊状の加熱品はすべて粉末と
なった。次に、上記粉末加熱品（以下、３００℃加熱品
と称す）を通常の石膏ボード用焼石膏に配合し作成した
厚さ１２ｍｍの石膏ボードについて、ＪＩＳＡ−６９０
１に基づき曲げ試験と剥離試験を行った。表−１に結果
を示す。Example 1 Waste material of gypsum board (millwood 12 mm thick end material,
The base paper was crushed by about 7% of the total with a crusher to obtain a crushed gypsum board that passed through a 9 mm sieve. This crushed product 1
0 kg (amount of base paper of about 700 g) was heated by an indirect heat transfer kiln gypsum heating device equipped with a stirrer to carbonize the base paper. The heating time at this time was 180 minutes, and the baking temperature was 300 ° C. Gypsum portion of the heating product was confirmed by X-ray diffraction, were all type III anhydrous gypsum rather gypsum and type II anhydrous gypsum. 7.2 kg of heated products including lumps were obtained. This heated product was pulverized for 10 minutes by a ball mill (capacity 24 l, rotation speed 60 rpm) containing 25 mmφ iron ball 40 kg. By this pulverization, all the lump-shaped heated products became powder. Next, a 12 mm-thick gypsum board prepared by blending the above-described powder-heated product (hereinafter referred to as 300 ° C.-heated product) with ordinary plasterboard plaster for gypsum board was tested according to JISA-690
Bending test and peeling test were performed based on 1. The results are shown in Table-1.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００９[Correction target item name] 0009
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００９】[0009]
【表１】 本発明の方法により得られた３００℃加熱品を配合した
ものは、通常の焼石膏単独使用の場合と比べて、曲げ破
壊荷重及び耐剥離性は何ら劣るものでなかった。尚、こ
の時の焼石膏の混水量及び凝結時間にも変化は見られな
かった。[Table 1] The blended product heated at 300 ° C. obtained by the method of the present invention was not inferior in bending fracture load and peeling resistance to the case of using ordinary calcined gypsum alone. No change was observed in the amount of water mixed with calcined gypsum and the setting time.
Claims (1)
ード用原紙が付着してなる石膏ボードの廃材を加熱して
石膏ボード用原紙を炭化させることを特徴とする石膏ボ
ード廃材から石膏を回収する方法。1. A gypsum is recovered from a gypsum board waste material, characterized in that the gypsum board waste paper having the gypsum board base paper attached to at least a part of the gypsum board core is heated to carbonize the gypsum board waste paper. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30229992A JP3221940B2 (en) | 1992-11-12 | 1992-11-12 | How to recover gypsum from gypsum board waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30229992A JP3221940B2 (en) | 1992-11-12 | 1992-11-12 | How to recover gypsum from gypsum board waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06142633A true JPH06142633A (en) | 1994-05-24 |
| JP3221940B2 JP3221940B2 (en) | 2001-10-22 |
Family
ID=17907308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30229992A Expired - Lifetime JP3221940B2 (en) | 1992-11-12 | 1992-11-12 | How to recover gypsum from gypsum board waste |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3221940B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002068740A (en) * | 2000-09-01 | 2002-03-08 | Taiheiyo Cement Corp | Method for manufacturing anhydrous gypsum for cement composition from gypsum waste material |
| JP2002086098A (en) * | 2000-09-12 | 2002-03-26 | Daiichi Cement Co Ltd | Method for firing waste plasterboard |
| JP2002087816A (en) * | 2000-09-12 | 2002-03-27 | Daiichi Cement Co Ltd | Firing/treatment process of gypsum plaster board waste material |
| JP2005281052A (en) * | 2004-03-29 | 2005-10-13 | Ado Ceramics Kenkyusho:Kk | Method and apparatus for manufacturing gypsum |
| JP2005336005A (en) * | 2004-05-26 | 2005-12-08 | Mitsubishi Materials Corp | Method for producing cement composition |
| JP2006327859A (en) * | 2005-05-25 | 2006-12-07 | Fujitekku:Kk | Firing apparatus |
| JP2007132552A (en) * | 2005-11-08 | 2007-05-31 | Kyudenko Corp | Heating device for waste gypsum |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020000138A (en) | 1998-11-25 | 2002-01-04 | 추후제출 | Dual-head phosphor screen scanner |
| JP5230140B2 (en) * | 2007-08-09 | 2013-07-10 | 株式会社トクヤマ | Method for producing dihydrate gypsum |
-
1992
- 1992-11-12 JP JP30229992A patent/JP3221940B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002068740A (en) * | 2000-09-01 | 2002-03-08 | Taiheiyo Cement Corp | Method for manufacturing anhydrous gypsum for cement composition from gypsum waste material |
| JP2002086098A (en) * | 2000-09-12 | 2002-03-26 | Daiichi Cement Co Ltd | Method for firing waste plasterboard |
| JP2002087816A (en) * | 2000-09-12 | 2002-03-27 | Daiichi Cement Co Ltd | Firing/treatment process of gypsum plaster board waste material |
| JP4543403B2 (en) * | 2000-09-12 | 2010-09-15 | 株式会社デイ・シイ | Method for firing gypsum board waste |
| JP2005281052A (en) * | 2004-03-29 | 2005-10-13 | Ado Ceramics Kenkyusho:Kk | Method and apparatus for manufacturing gypsum |
| 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 |
| JP2005336005A (en) * | 2004-05-26 | 2005-12-08 | Mitsubishi Materials Corp | Method for producing cement composition |
| JP2006327859A (en) * | 2005-05-25 | 2006-12-07 | Fujitekku:Kk | Firing apparatus |
| JP2007132552A (en) * | 2005-11-08 | 2007-05-31 | Kyudenko Corp | Heating device for waste gypsum |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3221940B2 (en) | 2001-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104692756A (en) | Process for producing calcined gypsum and gypsum board | |
| JP4515865B2 (en) | Treatment method for inorganic waste | |
| JPH06142633A (en) | Method for recovering plaster from waste material of plasterboard | |
| CN104108892B (en) | A kind of method of producing light partition board with industrial slags and construction refuse regenerated utilization | |
| JP2001510428A (en) | Improve or improve the production of rock wool | |
| JP4371801B2 (en) | Method for producing α-type hemihydrate gypsum from gypsum board waste and method for collecting base paper for gypsum board | |
| JP6084431B2 (en) | Water curable cured body | |
| JPH06142638A (en) | Method for recovering base paper for plasterboard and plaster from waste material of plasterboard | |
| JP3889115B2 (en) | How to use gypsum board waste | |
| JP2000271561A (en) | Method for separating asbestos from waste of asbestos- containing fiber reinforced cement panel, method for detoxifying separated asbestos, method for producing fiber reinforced cement panel reutilizing detoxified asbestos and fiber reinforced cement panel | |
| JP4651978B2 (en) | Recycling method of composite waste of gypsum board and rock wool sound absorbing board and gypsum board containing rock wool | |
| JP2001146420A (en) | Anhydrous gypsum compounds produced from gypsum waste material and method for producing the same | |
| JPS63500237A (en) | Method for converting organic and inorganic wastes into solid inert water-insoluble substances | |
| JP4418244B2 (en) | Method for producing powdered solidified material | |
| JP2004137139A (en) | Treatment method of rendering asbestos cement slate non-asbestine | |
| JP4014400B2 (en) | Soil treatment material composition and method for producing the same | |
| JPH1045442A (en) | Cement composition and its production | |
| JPH1045446A (en) | Production of anhydrous gypsum ii and cement | |
| JP2578259B2 (en) | Manufacturing method of hard wood chip cement board | |
| CN105060755A (en) | High performance concrete composite mineral additive prepared from construction wastes and preparation method thereof | |
| JP3434019B2 (en) | How to Recycle Cement Flake Board Waste | |
| JP2006043672A (en) | Treating method of asbestos containing inorganic waste | |
| JP3602588B2 (en) | Concrete waste treatment method | |
| US20120180598A1 (en) | Process using fly ash to create chunks of raw material for iron or steel mill activities. | |
| JPH11228199A (en) | Artificial lightweight aggregate and its pruduction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080817 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090817 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110817 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120817 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130817 Year of fee payment: 12 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130817 Year of fee payment: 12 |