A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
To provide a recycling method for waste gypsum that can produce type II anhydrous gypsum from waste gypsum contained, e.g., in a waste gypsum board at a temperature lower than that in conventional methods, and can separate paper and other materials with a small number of steps.SOLUTION: A method for recycling waste gypsum, in which an aqueous medium is added to waste gypsum containing paper and the like, and the mixture is heated and hydrothermally treated at a temperature of 140°C or higher, and then the water is separated to recover type II anhydrous gypsum. In cases where the hydrothermal treatment is performed for 5 hours or more, the temperature of the treatment is preferably 160°C or higher and 180°C or lower. When the hydrothermal treatment is performed for 24 hours or more, its temperature is preferably 140°C or higher and 160°C or lower.SELECTED DRAWING: None
【課題】廃石こうボード中などの廃石こうから従来の方法よりも低温でII型無水セッコウが生成でき、少ない製造工程で紙などの分離が可能な廃石こうのリサイクル方法を提供する。【解決手段】紙などが含まれる廃石こうに水性媒体を加えて加熱し、１４０℃以上の温度で水熱処理した後、水分を分離してII型無水セッコウを回収する。５時間以上水熱処理する場合には、水熱処理の温度は、好ましくは１６０℃以上、１８０℃以下とする。２４時間以上水熱処理する場合には、水熱処理の温度は、好ましくは１４０℃以上、１６０℃以下とする。【選択図】なし
To provide a recycling method for waste gypsum that can produce type II anhydrous gypsum from waste gypsum contained, e.g., in a waste gypsum board at a temperature lower than that in conventional methods, and can separate paper and other materials with a small number of steps.SOLUTION: A method for recycling waste gypsum, in which an aqueous medium is added to waste gypsum containing paper and the like, and the mixture is heated and hydrothermally treated at a temperature of 140°C or higher, and then the water is separated to recover type II anhydrous gypsum. In cases where the hydrothermal treatment is performed for 5 hours or more, the temperature of the treatment is preferably 160°C or higher and 180°C or lower. When the hydrothermal treatment is performed for 24 hours or more, its temperature is preferably 140°C or higher and 160°C or lower.SELECTED DRAWING: None
【課題】廃石こうボード中などの廃石こうから従来の方法よりも低温でII型無水セッコウが生成でき、少ない製造工程で紙などの分離が可能な廃石こうのリサイクル方法を提供する。【解決手段】紙などが含まれる廃石こうに水性媒体を加えて加熱し、１４０℃以上の温度で水熱処理した後、水分を分離してII型無水セッコウを回収する。５時間以上水熱処理する場合には、水熱処理の温度は、好ましくは１６０℃以上、１８０℃以下とする。２４時間以上水熱処理する場合には、水熱処理の温度は、好ましくは１４０℃以上、１６０℃以下とする。【選択図】なし
METHOD FOR RECYCLING WASTE GYPSUM
廃石こうのリサイクル方法
TSUKIJI MASARU (author)
2022-03-03
Patent
Electronic Resource
Japanese
IPC:
C04B
Kalk
,
LIME
/
B09B
DISPOSAL OF SOLID WASTE
,
Beseitigung von festem Abfall
/
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
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