GB1233436A - - Google Patents
Info
- Publication number
- GB1233436A GB1233436A GB1233436DA GB1233436A GB 1233436 A GB1233436 A GB 1233436A GB 1233436D A GB1233436D A GB 1233436DA GB 1233436 A GB1233436 A GB 1233436A
- Authority
- GB
- United Kingdom
- Prior art keywords
- water
- gypsum
- temperature
- reduce
- caso
- 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.)
- Expired
Links
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
- C04B11/02—Methods and apparatus for dehydrating gypsum
-
- 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
- C04B11/007—After-treatment of the dehydration products, e.g. aging, stabilisation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
1,233,436. Treating calcined gypsum. UNITED STATES GYPSUM CO. 20 May, 1968, No. 23811/68. Heading C1A. Hot calcined gypsum is treated, while agitated, with water to reduce its average temperature to below the b.pt. of water, and then heated to at least 214‹ F. until the combined water content is that of CaSO 4À¢ H 2 O. Preferably sufficient water is added to reduce the temperature to 155-200‹ F. and to give a free water content of up to 3À5%. The mass may be agitated mechanically and by injecting air under pressure. It may be reheated to 215-425‹ F. The initial calcination may be effected in open kettles or rotary calciners, using gypsum rock ground to 90-95% minus 100 mesh, at a temperature of 250-500‹ F., to form CaSO 4.¢ H 2 O. CaOl 2 may be added before calcination.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2381168 | 1968-05-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1233436A true GB1233436A (en) | 1971-05-26 |
Family
ID=10201691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1233436D Expired GB1233436A (en) | 1968-05-20 | 1968-05-20 |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1233436A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7371278B2 (en) | 2003-12-19 | 2008-05-13 | Lafarge Platres | Method and apparatus for stabilizing plaster |
US7824490B2 (en) | 2006-12-20 | 2010-11-02 | The Nugyp Corp. | Calcium sulfate hemihydrate treatment process |
EP2671854A1 (en) | 2012-06-06 | 2013-12-11 | Etex Dryco SAS | Method for stabilizing beta-hemihydrate plaster |
-
1968
- 1968-05-20 GB GB1233436D patent/GB1233436A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7371278B2 (en) | 2003-12-19 | 2008-05-13 | Lafarge Platres | Method and apparatus for stabilizing plaster |
US7748888B2 (en) | 2003-12-19 | 2010-07-06 | Lafarge Platres | Apparatus for stabilizing plaster |
US7824490B2 (en) | 2006-12-20 | 2010-11-02 | The Nugyp Corp. | Calcium sulfate hemihydrate treatment process |
US8282731B2 (en) | 2006-12-20 | 2012-10-09 | The Nugyp Corp. | Calcium sulfate hemihydrate treatment process |
EP2671854A1 (en) | 2012-06-06 | 2013-12-11 | Etex Dryco SAS | Method for stabilizing beta-hemihydrate plaster |
WO2013182587A1 (en) | 2012-06-06 | 2013-12-12 | Siniat International Sas | Method for stabilizing beta-hemihydrate plaster |
RU2594381C1 (en) * | 2012-06-06 | 2016-08-20 | Синиат Интернэшнл Сас | Method for stabilisation of beta-hemihydrate gypsum plaster |
US9751805B2 (en) | 2012-06-06 | 2017-09-05 | Etex Building Performance Sas | Method for stabilizing beta-hemihydrate plaster |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |