JPS5523020A - Manufacture of alpha-type hemihydrate gypsum - Google Patents
Manufacture of alpha-type hemihydrate gypsumInfo
- Publication number
- JPS5523020A JPS5523020A JP9443678A JP9443678A JPS5523020A JP S5523020 A JPS5523020 A JP S5523020A JP 9443678 A JP9443678 A JP 9443678A JP 9443678 A JP9443678 A JP 9443678A JP S5523020 A JPS5523020 A JP S5523020A
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- type hemihydrate
- hemihydrate gypsum
- seed
- fibrous
- 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 abstract 5
- 238000004519 manufacturing process Methods 0.000 title 1
- 229910052602 gypsum Inorganic materials 0.000 abstract 6
- 239000010440 gypsum Substances 0.000 abstract 6
- 239000003607 modifier Substances 0.000 abstract 3
- 239000002002 slurry Substances 0.000 abstract 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 abstract 2
- 239000011976 maleic acid Substances 0.000 abstract 2
- 150000003839 salts Chemical class 0.000 abstract 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 abstract 2
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
PURPOSE: To stably obtain high quality α-type hemihydrate gypsum without unevenness in characteristics by adding fibrous α-type hemihydrate gypsum as a seed and maleic acid or a salt thereof as a habit modifier to a gypsum slurry followed by heating under press.
CONSTITUTION: To a gypsum slurry are added fibrous α-type hemihydrate gypsum of 1W5μ minor axis and 100W200μ major axis as a seed in an amt. of 0.02W0.2, pref. 0.05W0.1 part by wt. to 100 parts of gypsum and maleic acid or a salt thereof as a habit modifier in an amt. of 0.05W0.1, pref. 0.06W0.08 part to 100 parts of gypsum. The slurry is then heated under press. for 0.5W3hr at 120W140°C to convert the gypsum into α-type hemihydrate gypsum. The fibrous seed is obtd. by heating gypsum at 120W150°C under press. for about 1.5hr in the absence of a habit modifier.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9443678A JPS5523020A (en) | 1978-08-02 | 1978-08-02 | Manufacture of alpha-type hemihydrate gypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9443678A JPS5523020A (en) | 1978-08-02 | 1978-08-02 | Manufacture of alpha-type hemihydrate gypsum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5523020A true JPS5523020A (en) | 1980-02-19 |
Family
ID=14110193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9443678A Pending JPS5523020A (en) | 1978-08-02 | 1978-08-02 | Manufacture of alpha-type hemihydrate gypsum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5523020A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4965031A (en) * | 1989-02-24 | 1990-10-23 | The Celotex Corporation | Continuous production of gypsum board |
-
1978
- 1978-08-02 JP JP9443678A patent/JPS5523020A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4965031A (en) * | 1989-02-24 | 1990-10-23 | The Celotex Corporation | Continuous production of gypsum board |
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