JP2001122645A - Production process of regenerated hemihydrate gypsum and production process of soil solidification agent - Google Patents
Production process of regenerated hemihydrate gypsum and production process of soil solidification agentInfo
- Publication number
- JP2001122645A JP2001122645A JP30600999A JP30600999A JP2001122645A JP 2001122645 A JP2001122645 A JP 2001122645A JP 30600999 A JP30600999 A JP 30600999A JP 30600999 A JP30600999 A JP 30600999A JP 2001122645 A JP2001122645 A JP 2001122645A
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- production process
- hemihydrate gypsum
- waste
- regenerated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 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 title claims abstract description 28
- 239000002689 soil Substances 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000007711 solidification Methods 0.000 title abstract description 4
- 230000008023 solidification Effects 0.000 title abstract description 4
- 239000003795 chemical substances by application Substances 0.000 title abstract 2
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 44
- 239000010440 gypsum Substances 0.000 claims abstract description 43
- 239000002699 waste material Substances 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 8
- 238000000465 moulding Methods 0.000 description 8
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 7
- 230000036571 hydration Effects 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000011507 gypsum plaster Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000282376 Panthera tigris Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、再生半水石膏の製
造方法及び土壌固化材の製造方法に関し、詳しくは、石
膏成型体廃材の有効利用を図ることができる再生半水石
膏の製造方法及び土壌固化材の製造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 producing recycled hemihydrate gypsum and a method for producing a solidified soil material, and more particularly, to a method for producing recycled hemihydrate gypsum that can effectively utilize waste gypsum moldings. The present invention relates to a method for producing a soil hardening material.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】廃石膏
ボード等の石膏成型体廃材は、建物建設・解体等によっ
て、多量に排出されており、従来は埋め立て等により廃
棄処理されていた。ところで、廃棄物処理法の改正によ
り、石膏成型体廃材は、安定型処分場での処理を行うこ
とができず、管理型処理場での処理が必要とされたた
め、埋め立てを行う場所が枯渇し、更に、近年、環境保
全の観点から資源の有効リサイクルの重要性が叫ばれる
ようになったため、石膏成型体廃材の有効利用が望まれ
ている。2. Description of the Related Art A large amount of waste gypsum molded material such as waste gypsum board is discharged due to building construction and demolition, and has conventionally been disposed of by landfilling. By the way, due to the revision of the Waste Disposal and Public Cleansing Law, gypsum molded waste could not be treated at a stable disposal site, and it had to be treated at a managed disposal site. Furthermore, in recent years, the importance of effective recycling of resources has come to be emphasized from the viewpoint of environmental conservation. Therefore, effective use of waste gypsum molded products has been desired.
【０００３】一方、この種の石膏成型体廃材の有効利用
を図る方法としては、特開平１０−３６１４９号公報所
載の方法が知られている。即ち、廃石膏ボードを６００
〜１１００℃に加熱して、廃石膏ボードに含まれる有機
分を完全に取り除き、セメント組成物配合に適した石膏
を製造する方法である。On the other hand, a method disclosed in Japanese Patent Application Laid-Open No. Hei 10-36149 is known as a method for effectively utilizing this type of waste gypsum molded material. That is, waste gypsum board is 600
This is a method of heating to １1100 ° C. to completely remove the organic components contained in the waste gypsum board and produce a gypsum suitable for blending the cement composition.
【０００４】しかしながら、上記石膏の製造方法では、
実施するための設備が大きくなると共に、加熱に要する
熱エネルギーが非常に大きくなる等、コスト上の問題が
有る。しかも、得られた石膏はII型無水石膏であり、水
和速度が著しく遅いため、セメントの水和調整として使
用することは可能であるが、その粉末のみでは、速硬性
を要する土壌固化材などへの適用は困難である。However, in the above method for producing gypsum,
There is a problem in terms of cost, such as an increase in the size of the equipment for performing the operation and an extremely large amount of heat energy required for heating. Moreover, the obtained gypsum is a type II anhydrous gypsum, and its hydration rate is extremely slow, so it is possible to use it for adjusting the hydration of cement. Application to is difficult.
【０００５】即ち、上記従来の方法では、石膏成型体廃
材の有効利用を図ることができるもののコスト上問題が
あり、しかも、その方法によって得られた石膏は、土壌
固化材への適用が困難であった。[0005] That is, in the above-mentioned conventional method, although the waste gypsum molding can be effectively used, there is a problem in cost, and the gypsum obtained by the method is difficult to apply to the soil solidifying material. there were.
【０００６】一方、固化材を使用して土壌を固化する場
合、固化した土壌ができる限り中性域（例えば、ｐＨ６
〜８）に保て、土壌のｐＨ値に影響を与えること等の殆
どないものが周辺環境の保全上望ましいことである。[0006] On the other hand, when the soil is solidified by using a solidifying material, the solidified soil is as neutral as possible (for example, pH 6).
~ 8), which hardly affects the pH value of the soil, is desirable for preservation of the surrounding environment.
【０００７】そこで、本発明は、上記従来の問題点に鑑
みなされたもので、コスト上安価で且つ石膏成型体廃材
の有効利用を図ることができ、しかも、土壌固化材への
適用も可能な石膏を製造することを第１の課題とする。
また、コスト上安価で且つ石膏成型体廃材の有効利用を
図ることができ、しかも、周辺環境の保全に好適な土壌
固化材を製造することを第２の課題とする。In view of the above, the present invention has been made in view of the above-mentioned conventional problems, and is inexpensive in terms of cost, can effectively utilize waste gypsum moldings, and can be applied to soil solidification materials. The first problem is to produce gypsum.
A second object is to produce a soil solidifying material which is inexpensive and can effectively use waste gypsum molded products, and is suitable for preservation of the surrounding environment.
【０００８】[0008]
【課題を解決するための手段】上記第１の課題を解決す
べく、本発明は、石膏成型体廃材を、大気圧中又は加圧
下で、６０℃〜２３０℃に加熱することを特徴とする再
生半水石膏の製造方法にかかる。また、上記第２の課題
を解決すべく、本発明は、石膏成型体廃材を、大気圧中
又は加圧下で、６０℃〜２３０℃に加熱して再生半水石
膏とし、該再生半水石膏を原料に用いることを特徴とす
る土壌固化材の製造方法にかかる。In order to solve the above first problem, the present invention is characterized in that waste gypsum moldings are heated to 60 ° C. to 230 ° C. under atmospheric pressure or under pressure. A method for producing recycled hemihydrate gypsum. Further, in order to solve the second problem, the present invention provides a method for regenerating hemihydrate gypsum by heating a gypsum molded waste at 60 ° C. to 230 ° C. under atmospheric pressure or under pressure. The present invention relates to a method for producing a soil solidifying material, characterized by using lime as a raw material.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態につい
て、説明する。本発明における石膏成型体廃材として
は、石膏を含有する成型体であれば特に限定されず、例
えば、廃石膏ボード、廃石膏ブロック、型どり用廃石膏
型、鋳込み成型用廃石膏型等を例示できる。これらは、
できるだけプラスチック、木片などの異物の混入が少な
いものが好ましい。回収されてくる廃石膏ボード等に含
まれるプラスチックは、熱可塑性のものが多く、これら
をそのまま加熱すると、溶解して大きな塊状物を形成す
るため、その取扱いが困難になるからであり、場合によ
っては、プラスチックが燃焼して、悪臭や有害ガスを発
生することも有るからである。Embodiments of the present invention will be described below. The gypsum molded body waste material in the present invention is not particularly limited as long as it is a molded body containing gypsum, and examples thereof include waste gypsum board, waste gypsum block, waste gypsum mold for molding, waste gypsum mold for cast molding, and the like. . They are,
It is preferable to use as little foreign matter as possible, such as plastic and wood chips. Most of the plastics contained in the waste gypsum board and the like that are collected are thermoplastic, and if these are heated as they are, they will dissolve and form large lumps, making it difficult to handle them. This is because plastics may burn and generate odors and harmful gases.
【００１０】また、これらの石膏成型体廃材は、通常、
粉砕されて使用される。粉砕された後の形状は、特に限
定されるものではないが、加熱によってバランス良く半
水化させるため、揃っている方が好ましい。更に、大き
さは、径が１０ｍｍ以下とされてなるものがよい。[0010] These waste gypsum moldings are usually
Used to be crushed. The shape after pulverization is not particularly limited, but it is preferable that the shapes are uniform in order to make the water hemihydrate in a well-balanced manner by heating. Further, the size is preferably one having a diameter of 10 mm or less.
【００１１】異物が紙などである場合は、取り除けるも
ので有れば取り除く方が良い。但し、取り除かなくと
も、特に問題はない。If the foreign matter is paper or the like, it is better to remove it if it can be removed. However, there is no particular problem even if it is not removed.
【００１２】加熱する温度は、６０℃〜２３０℃である
ことを要する。２３０℃より高ければ、生成物は、II型
無水石膏を多く含むことになり、半水石膏を効率良く得
ることができないからである。しかも、II型無水石膏を
多く含む生成物を土壌固化材に適用すると、水和速度が
極端に遅い土壌固化材となり、しかも、固化された土壌
は、所望の強度を得ることが困難となるからである。ま
た、６０℃より低ければ、半水石膏となるまでに極端に
時間がかかることとなるからである。加熱時間も、加熱
温度、使用する石膏成型体廃材の形状、粉砕の程度、含
水率などにより、適宜調整すればよい。[0012] The heating temperature must be 60 ° C to 230 ° C. If the temperature is higher than 230 ° C., the product will contain a large amount of type II anhydrous gypsum, so that hemihydrate gypsum cannot be obtained efficiently. Moreover, when a product containing a large amount of type II anhydrous gypsum is applied to the soil solidifying material, the hydration rate becomes extremely slow, and the solidified soil becomes difficult to obtain a desired strength. It is. On the other hand, if the temperature is lower than 60 ° C., it takes an extremely long time to obtain hemihydrate gypsum. The heating time may also be appropriately adjusted depending on the heating temperature, the shape of the waste gypsum molding used, the degree of pulverization, the water content, and the like.
【００１３】加熱の際、石膏成形体廃材の一部が、III
型無水石膏に転化する場合があるが、III 型無水石膏
は、空気中の水分を強力に吸着し、自然と半水石膏に戻
るため問題となることはない。[0013] During the heating, part of the waste gypsum compact is converted to III
Although it may be converted to anhydrous gypsum, type III anhydrous gypsum strongly absorbs moisture in the air and naturally returns to hemihydrate gypsum, so there is no problem.
【００１４】加圧は、通常圧力容器内で行われ、好まし
くは、１０気圧以下、より好ましくは、３〜１０気圧と
する。３〜１０気圧の範囲で行えば、β型半水石膏に比
べて、少ない水量で同程度の流動性を得ることができる
α型半水石膏、即ち、水和後に硬化した際の強度が高い
α型半水石膏を得ることができる。The pressurization is usually performed in a pressure vessel, preferably 10 atm or less, more preferably 3 to 10 atm. If performed in the range of 3 to 10 atm, compared to β-type hemihydrate gypsum, α-type hemihydrate gypsum that can obtain the same fluidity with a small amount of water, that is, high strength when hardened after hydration α-type hemihydrate gypsum can be obtained.
【００１５】本発明によって製造された再生半水石膏
は、水和によって硬化させる場合、硬化速度を調整する
ため、タンパク質などの凝結調整剤を添加してもよい。
また、前記再生半水石膏は、土壌固化材の原料として好
適であるが、その用途は限定されず、従来一般に半水石
膏が使用されている各種の用途に適用ことができる。例
えば、浚渫土は、水分が非常に多く流動性があり、運搬
する場合に取扱いが困難となるため、一時的に固化すべ
く、浚渫土に添加しても良い。When the regenerated hemihydrate gypsum produced according to the present invention is cured by hydration, a setting regulator such as protein may be added in order to adjust the curing speed.
Further, the regenerated hemihydrate gypsum is suitable as a raw material of a soil solidifying material, but its use is not limited, and can be applied to various uses in which hemihydrate gypsum is generally used conventionally. For example, dredged soil has a very large amount of water and has fluidity, which makes it difficult to handle when transported. Therefore, the dredged soil may be added to the dredged soil to be temporarily solidified.
【００１６】[0016]
【実施例】以下、本発明の実施例について説明する。実施例 先ず、市販の石膏ボード（商品名「タイガーボード」、
吉野石膏社製）をジョークラッシャーで、直径２ｍｍ程
度に粗粉砕した後、粗さが１０ｍｍのふるいを使用し
て、石膏ボードに含まれる紙を大まかに取り除き、実施
例の廃石膏ボードとした。Embodiments of the present invention will be described below. Example First, a commercially available gypsum board (trade name “Tiger Board”,
(Yoshino Gypsum Co., Ltd.) was roughly pulverized with a jaw crusher to a diameter of about 2 mm, and the paper contained in the gypsum board was roughly removed using a sieve with a roughness of 10 mm to obtain a waste gypsum board of the example.
【００１７】得られた廃石膏ボードを、それぞれ下記表
１の実施例１〜５に示す条件にて加熱し、再生半水石膏
を製造した。The waste gypsum boards thus obtained were heated under the conditions shown in Examples 1 to 5 in Table 1 below to produce recycled hemihydrate gypsum.
【００１８】[0018]
【表１】 [Table 1]
【００１９】比較例 実施例で製造した廃石膏ボードを使用し、上記表１に示
す条件にて加熱し、比較例１及び比較例２の石膏を得
た。また、市販の焼き石膏（商品名「焼石膏」、キシダ
化学社製）を比較例３の石膏とした。[0019] Using the gypsum board produced in Comparative Example Example, and heated under the conditions shown in Table 1, to obtain a plaster of Comparative Example 1 and Comparative Example 2. Further, a commercially available plaster of Paris (trade name “plaster of Paris”, manufactured by Kishida Chemical Co., Ltd.) was used as the plaster of Comparative Example 3.
【００２０】試験例 実施例１乃至５によって製造された半水石膏及び比較例
の石膏をそれぞれ使用して、土壌固化試験を行った。先
ず、含水率が２００％のヘドロ（大阪市大正区の河川ヘ
ドロ）１ｍ3に対して実施例の半水石膏（比較例の石
膏）を２００ｋｇ添加し、混合機で攪拌した後、直径５
ｃｍ×１０ｃｍの型枠に流し込み、１日静置した後に脱
型し、得られたものを供試体として、土の一軸圧縮試験
方法（土木工学会基準：ＪＧＳＴ５１１−１９９０）に
準拠して、１軸圧縮強度を測定した。尚、一般に半水石
膏の水和は速く、養生期間を１日以上長くしても強度増
加が見られないので、脱型直後に上記強度測定を行っ
た。その結果を下記表２に示した。また、強度測定後の
供試体を直径５ｍｍ以下に粉砕した後、該供試体１重量
部に対し、水を１０重量部添加し、５分間攪拌した後の
ｐＨを測定した。 Test Example A soil solidification test was performed using each of the hemihydrate gypsum produced in Examples 1 to 5 and the gypsum of the comparative example. First, 200 kg of the hemihydrate gypsum (the gypsum of the comparative example) was added to 1 m 3 of sludge having a water content of 200% (river sludge in Taisho ward, Osaka City), and the mixture was stirred with a mixer.
Poured into a mold having a size of 10 cm × 10 cm, allowed to stand for one day, and then removed from the mold. The obtained product was used as a test specimen, and the test piece was subjected to a uniaxial compression test method for soil (JCST 511-1990). The axial compression strength was measured. In general, the hydration of hemihydrate gypsum is fast, and the strength is not increased even if the curing period is extended by one day or more. Therefore, the strength was measured immediately after demolding. The results are shown in Table 2 below. Further, the specimen after the strength measurement was pulverized to a diameter of 5 mm or less, 10 parts by weight of water was added to 1 part by weight of the specimen, and the pH was measured after stirring for 5 minutes.
【００２１】[0021]
【表２】 [Table 2]
【００２２】表２から明らかな様に、加熱温度が、６０
℃より低いもの（比較例１）及び２３０℃より高いもの
（比較例２）は、速効性の固化材として使用できないこ
とが理解できる。また、石膏を土壌固化材として使用し
た場合、該土壌固化材によって、固化された土壌のｐＨ
値が変化することはほとんどない。As is clear from Table 2, the heating temperature was 60
It can be understood that those having a temperature lower than 0 ° C. (Comparative Example 1) and those having a temperature higher than 230 ° C. (Comparative Example 2) cannot be used as a fast-acting solidifying material. When gypsum is used as a soil solidifying material, the pH of the soil solidified by the soil solidifying material is adjusted.
The values rarely change.
【００２３】[0023]
【発明の効果】以上のように、本発明にかかる再生半水
石膏の製造方法によれば、石膏成型体廃材を利用すると
共に加熱の温度が６０℃〜２３０℃であるため、コスト
上安価で且つ石膏成型体廃材を有効に利用でき、しか
も、得られた半水石膏は速硬性に優れるため、土壌固化
材へ適用することも可能である。また、本発明にかかる
土壌固化材の製造方法によれば、コスト上安価で且つ石
膏成型体廃材を有効に利用することができ、しかも、周
辺環境の保全に好適な土壌固化材を製造できる。As described above, according to the method for producing recycled hemihydrate gypsum according to the present invention, waste gypsum is used and the heating temperature is 60 ° C. to 230 ° C. In addition, the gypsum molded waste can be effectively used, and the obtained hemihydrate gypsum is excellent in quick-setting properties, so that it can be applied to a soil solidifying material. Further, according to the method for manufacturing a soil hardening material according to the present invention, it is possible to manufacture a soil hardening material that is inexpensive and can effectively use waste gypsum molded articles, and that is suitable for preserving the surrounding environment.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4D004 AA16 BA02 CA04 CA45 DA02 DA03 DA06 4H026 CA04 CC02 CC05 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D004 AA16 BA02 CA04 CA45 DA02 DA03 DA06 4H026 CA04 CC02 CC05
Claims (2)
で、６０℃〜２３０℃に加熱することを特徴とする再生
半水石膏の製造方法。1. A method for producing recycled hemihydrate gypsum, comprising heating a waste gypsum molded body at 60 ° C. to 230 ° C. under atmospheric pressure or under pressure.
で、６０℃〜２３０℃に加熱して再生半水石膏とし、該
再生半水石膏を原料に用いることを特徴とする土壌固化
材の製造方法。2. A method for solidifying soil comprising heating waste gypsum molded material at 60 ° C. to 230 ° C. under atmospheric pressure or under pressure to produce regenerated hemihydrate gypsum, and using the regenerated hemihydrate gypsum as a raw material. The method of manufacturing the material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30600999A JP2001122645A (en) | 1999-10-27 | 1999-10-27 | Production process of regenerated hemihydrate gypsum and production process of soil solidification agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30600999A JP2001122645A (en) | 1999-10-27 | 1999-10-27 | Production process of regenerated hemihydrate gypsum and production process of soil solidification agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001122645A true JP2001122645A (en) | 2001-05-08 |
Family
ID=17951990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30600999A Pending JP2001122645A (en) | 1999-10-27 | 1999-10-27 | Production process of regenerated hemihydrate gypsum and production process of soil solidification agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001122645A (en) |
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| JP2006327859A (en) * | 2005-05-25 | 2006-12-07 | Fujitekku:Kk | Firing equipment |
| JP2007070139A (en) * | 2005-09-05 | 2007-03-22 | Nikko Co Ltd | Method for thermal regeneration treatment of waste gypsum by utilizing asphalt plant |
| JP2007070138A (en) * | 2005-09-05 | 2007-03-22 | Nikko Co Ltd | Apparatus for thermal regenerative treatment of waste gypsum |
| JP2007161895A (en) * | 2005-12-14 | 2007-06-28 | Masahito Mori | Method for recycling waste plasterboard, soil-improving agent using waste plasterboard and improved soil |
| JP2007308342A (en) * | 2006-05-19 | 2007-11-29 | Nikko Co Ltd | Apparatus and method for thermally regenerating waste gypsum |
| ITRE20080066A1 (en) * | 2008-07-10 | 2010-01-11 | Andrea Leurini | RECOVERY AND REUSE OF DENTAL PLASTERS |
| JP2010012442A (en) * | 2008-07-07 | 2010-01-21 | Nikko Co Ltd | Method of hardening soft soil using waste gypsum |
| JP2010247027A (en) * | 2009-04-13 | 2010-11-04 | Tokuyama Corp | How to treat gypsum board waste |
| JP2011099079A (en) * | 2009-11-09 | 2011-05-19 | Fukuoka Univ | Method for producing soil conditioner, soil conditioner, and method for repairing contaminated soil by using the same |
| EP2418184B1 (en) | 2010-08-12 | 2016-02-10 | Lindner GFT GmbH | Method for manufacturing alpha-calcium sulphate hemi-hydrate |
| EP2665689B1 (en) | 2011-01-17 | 2017-03-15 | Knauf Gips KG | Method for reusing grinding dust and waste material from gypsum plasterboards |
| EP3984977A1 (en) * | 2020-10-19 | 2022-04-20 | Lindner NORIT GmbH & Co. KG | Method for recycling gypsum wallboard material |
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1999
- 1999-10-27 JP JP30600999A patent/JP2001122645A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006327859A (en) * | 2005-05-25 | 2006-12-07 | Fujitekku:Kk | Firing equipment |
| JP2007070139A (en) * | 2005-09-05 | 2007-03-22 | Nikko Co Ltd | Method for thermal regeneration treatment of waste gypsum by utilizing asphalt plant |
| JP2007070138A (en) * | 2005-09-05 | 2007-03-22 | Nikko Co Ltd | Apparatus for thermal regenerative treatment of waste gypsum |
| JP2007161895A (en) * | 2005-12-14 | 2007-06-28 | Masahito Mori | Method for recycling waste plasterboard, soil-improving agent using waste plasterboard and improved soil |
| JP2007308342A (en) * | 2006-05-19 | 2007-11-29 | Nikko Co Ltd | Apparatus and method for thermally regenerating waste gypsum |
| JP2010012442A (en) * | 2008-07-07 | 2010-01-21 | Nikko Co Ltd | Method of hardening soft soil using waste gypsum |
| ITRE20080066A1 (en) * | 2008-07-10 | 2010-01-11 | Andrea Leurini | RECOVERY AND REUSE OF DENTAL PLASTERS |
| JP2010247027A (en) * | 2009-04-13 | 2010-11-04 | Tokuyama Corp | How to treat gypsum board waste |
| JP2011099079A (en) * | 2009-11-09 | 2011-05-19 | Fukuoka Univ | Method for producing soil conditioner, soil conditioner, and method for repairing contaminated soil by using the same |
| EP2418184B1 (en) | 2010-08-12 | 2016-02-10 | Lindner GFT GmbH | Method for manufacturing alpha-calcium sulphate hemi-hydrate |
| EP2418184B2 (en) † | 2010-08-12 | 2021-02-17 | Lindner GFT GmbH | Method for manufacturing alpha-calcium sulphate hemi-hydrate |
| EP2665689B1 (en) | 2011-01-17 | 2017-03-15 | Knauf Gips KG | Method for reusing grinding dust and waste material from gypsum plasterboards |
| EP3984977A1 (en) * | 2020-10-19 | 2022-04-20 | Lindner NORIT GmbH & Co. KG | Method for recycling gypsum wallboard material |
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