GB355694A - Improvements in the preparation of calcium sulphate - Google Patents
Improvements in the preparation of calcium sulphateInfo
- Publication number
- GB355694A GB355694A GB618330A GB618330A GB355694A GB 355694 A GB355694 A GB 355694A GB 618330 A GB618330 A GB 618330A GB 618330 A GB618330 A GB 618330A GB 355694 A GB355694 A GB 355694A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dried
- sulphuric acid
- calcium sulphate
- acid
- sulphate
- 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
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
A finely divided and apparently amorphous form of anhydrous calcium sulphate is obtained by treating the anhydrous salt, obtained, for instance, by heating the hydrated form at or below 200 DEG C., with sulphuric acid at a suitable strength, but insufficient to cause the formation of calcium bisulphate. For example, the hot dehydrated compound may be mixed with sulphuric acid of 1,2 specific gravity at 100 DEG C., in quantity sufficient to provide 4-5 grams SO3 to each 100 grams anhydrous calcium sulphate. This temperature is maintained until conversion is complete, when the product is washed and dried, or dried and calcined. Alternatively, the dehydrated and cooled calcium sulphate may be moistened with cold sulphuric acid of 1,4-1,7 specific gravity and the mass, after conversion, is washed and dried, or dried and calcined. According to the Provisional Specification, sulphuric acid in any of its forms, or acid sulphates such as titanium sulphate, or phosphoric acid may be used as the disintegrating agent. Specification 319,228, [Class 1 (iii), Oxides &c. Metallic], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB618330A GB355694A (en) | 1930-02-25 | 1930-02-25 | Improvements in the preparation of calcium sulphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB618330A GB355694A (en) | 1930-02-25 | 1930-02-25 | Improvements in the preparation of calcium sulphate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB355694A true GB355694A (en) | 1931-08-25 |
Family
ID=9809912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB618330A Expired GB355694A (en) | 1930-02-25 | 1930-02-25 | Improvements in the preparation of calcium sulphate |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB355694A (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 |
-
1930
- 1930-02-25 GB GB618330A patent/GB355694A/en not_active Expired
Cited By (2)
| 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 |
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