JPS5650116A - Manufacture of calcined gypsum - Google Patents
Manufacture of calcined gypsumInfo
- Publication number
- JPS5650116A JPS5650116A JP12325079A JP12325079A JPS5650116A JP S5650116 A JPS5650116 A JP S5650116A JP 12325079 A JP12325079 A JP 12325079A JP 12325079 A JP12325079 A JP 12325079A JP S5650116 A JPS5650116 A JP S5650116A
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- temp
- calcined gypsum
- strength
- lowers
- 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
- 229910052602 gypsum Inorganic materials 0.000 title abstract 7
- 239000010440 gypsum Substances 0.000 title abstract 7
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 230000003009 desulfurizing effect Effects 0.000 abstract 2
- 238000001035 drying Methods 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- 238000001354 calcination Methods 0.000 abstract 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
PURPOSE: To easily manufacture calcined gypsum givning a hardened body of high compressive strength by drying and dehydrating gypsum, at a specifid temp., recovered by desulfurizing exhaust gas.
CONSTITUTION: Slurried gypsum recovered by desulfurizing exhaust gas is dried and dehydrated by heating at 105W115°C for 20W24hr in a drying furnace without carrying out pretreatment to obtain calcined gypsum. A heating temp. below 105°C or above 115°C lowers the strength of a hardened body, and a calcining time shorter than 20hr or longer than 24hr also lowers the strength. The reason is considered that much undehydrated gypsum is left in case of a lower temp. and a shorter time and calcined gypsum is partially converted into anhydrous gypsum which is not solidified in the absence of a hardening accelerator in case of a higher temp. and a longer time.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12325079A JPS5650116A (en) | 1979-09-27 | 1979-09-27 | Manufacture of calcined gypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12325079A JPS5650116A (en) | 1979-09-27 | 1979-09-27 | Manufacture of calcined gypsum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5650116A true JPS5650116A (en) | 1981-05-07 |
Family
ID=14855914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12325079A Pending JPS5650116A (en) | 1979-09-27 | 1979-09-27 | Manufacture of calcined gypsum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5650116A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04117185U (en) * | 1991-03-29 | 1992-10-20 | アイシン精機株式会社 | bellows pump |
| EP0778820A1 (en) | 1994-08-30 | 1997-06-18 | American Biogenetic Sciences, Inc. | Neurotrophic and antiproliferative compounds |
-
1979
- 1979-09-27 JP JP12325079A patent/JPS5650116A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04117185U (en) * | 1991-03-29 | 1992-10-20 | アイシン精機株式会社 | bellows pump |
| EP0778820A1 (en) | 1994-08-30 | 1997-06-18 | American Biogenetic Sciences, Inc. | Neurotrophic and antiproliferative compounds |
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