GB829652A - Improvements in or relating to the burning of gypsum - Google Patents
Improvements in or relating to the burning of gypsumInfo
- Publication number
- GB829652A GB829652A GB1670/57A GB167057A GB829652A GB 829652 A GB829652 A GB 829652A GB 1670/57 A GB1670/57 A GB 1670/57A GB 167057 A GB167057 A GB 167057A GB 829652 A GB829652 A GB 829652A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gypsum
- steam
- heated
- pressure
- heating
- 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
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
Hard model and hard moulding gypsums are prepared by heating crude gypsum in an indirectly heated autoclave, in which the pressure generated inside the autoclave, mainly by vaporized water of crystallization, is released, when a selected value has been reached, by blowing off steam, thereby reducing the pressure to substantially atmospheric, and repeating this procedure until the desired gypsum is obtained. The gypsum is then dried by heating at atmospheric pressure. A small amount of water may be added to the crude gypsum prior to heating. The drying is conveniently carried out in a separate vessel heated externally by steam. The gypsum may be comminuted prior to drying. In an example, gypsum is heated to a maximum temperature of 175 DEG C. for 1 1/2 hours, the steam being blown off when a pressure of 6 atmospheres is reached. This is repeated twice, the gypsum is then comminuted to pea-sized grains, and is dried in a steam-heated vessel at a temperature not exceeding 175 DEG C.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE829652X | 1956-01-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB829652A true GB829652A (en) | 1960-03-02 |
Family
ID=6748570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1670/57A Expired GB829652A (en) | 1956-01-27 | 1957-01-16 | Improvements in or relating to the burning of gypsum |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB829652A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5015449A (en) * | 1987-05-22 | 1991-05-14 | Promineral Gesellschaft Zur Verwendung Von Mineralstoffen Mbh | Process for making construction grade calcium sulfate alpha-hemihydrate from moist finely divided gypsum obtained from a power plant flue gas desulfurization |
-
1957
- 1957-01-16 GB GB1670/57A patent/GB829652A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5015449A (en) * | 1987-05-22 | 1991-05-14 | Promineral Gesellschaft Zur Verwendung Von Mineralstoffen Mbh | Process for making construction grade calcium sulfate alpha-hemihydrate from moist finely divided gypsum obtained from a power plant flue gas desulfurization |
| US5015450A (en) * | 1987-05-22 | 1991-05-14 | Promineral Gesellschaft Zur Verwendung Von Mineralstoffen Mbh | Process for making calcium sulfate alpha-hemihydrate from calcium sulfate dihydrate |
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