GB561392A - Improvements in or relating to the production of gypsum from anhydrite - Google Patents
Improvements in or relating to the production of gypsum from anhydriteInfo
- Publication number
- GB561392A GB561392A GB970242A GB970242A GB561392A GB 561392 A GB561392 A GB 561392A GB 970242 A GB970242 A GB 970242A GB 970242 A GB970242 A GB 970242A GB 561392 A GB561392 A GB 561392A
- Authority
- GB
- United Kingdom
- Prior art keywords
- anhydrite
- sulphate
- gypsum
- water
- hydration
- 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
- C04B11/06—Calcium sulfate cements starting from anhydrite
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
561,392. Gypsum. HIMSWORTH, F. R, LEFEBURE, V., and IMPERIAL CHEMICAL INDUSTRIES, Ltd. July 13, 1942, No. 9702. Drawings to Specification. [Class 1 (iii)] Gypsum in a form suitable for conversion into plaster of Paris is obtained by hydrating finely divided anhydrite, with a quantity of water sufficient to prevent setting of the anhydrite, in continuous manner in two or more stages. Anhydrite and water are caused to.flow through a series of stages in which the degree of hydration is continuously increased, hydrated calcium sulphate and water being withdrawn, from the last stage ; part of the magma so withdrawn may be recirculated. Seed crystals obtained according to the process of Specification 561,206 may be introduced into the reaction zone at the start of the process. The hydration may be effected in the presence of a catalyst consisting of a mixture of a sulphate of a monovalent metal (or ammonium) with a sulphate of a trivalent metal with or without a sulphate of a divalent metal, e.g. as described in Specification 561,205.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB970242A GB561392A (en) | 1942-07-13 | 1942-07-13 | Improvements in or relating to the production of gypsum from anhydrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB970242A GB561392A (en) | 1942-07-13 | 1942-07-13 | Improvements in or relating to the production of gypsum from anhydrite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB561392A true GB561392A (en) | 1944-05-18 |
Family
ID=9877103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB970242A Expired GB561392A (en) | 1942-07-13 | 1942-07-13 | Improvements in or relating to the production of gypsum from anhydrite |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB561392A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1983002110A1 (en) * | 1981-12-14 | 1983-06-23 | United States Gypsum Co | Process for rapid conversion of fluoroanhydrite to gypsum |
-
1942
- 1942-07-13 GB GB970242A patent/GB561392A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1983002110A1 (en) * | 1981-12-14 | 1983-06-23 | United States Gypsum Co | Process for rapid conversion of fluoroanhydrite to gypsum |
| US4402922A (en) * | 1981-12-14 | 1983-09-06 | United States Gypsum Company | Process for rapid conversion of fluoroanhydrite to gypsum |
| AU570624B2 (en) * | 1981-12-14 | 1988-03-24 | United States Gypsum Company | Process for rapid conversion of fluoroanhydrite to gypsum |
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