GB1387178A - Preparation of finely divided calcium sulphate hemihydrate - Google Patents
Preparation of finely divided calcium sulphate hemihydrateInfo
- Publication number
- GB1387178A GB1387178A GB1518772A GB1518772A GB1387178A GB 1387178 A GB1387178 A GB 1387178A GB 1518772 A GB1518772 A GB 1518772A GB 1518772 A GB1518772 A GB 1518772A GB 1387178 A GB1387178 A GB 1387178A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mill
- calcium sulphate
- sulphate hemihydrate
- preparation
- finely divided
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Crushing And Grinding (AREA)
Abstract
1387178 Coated textiles; vibratory ball mills; impact pulverizers GIULINI GmbH Gebr 30 March 1972 [1 April 1971] 15187/72 Headings B2A and B2E [Also in Division Cl] Textile material, e.g. a bandage, or paper is coated with alpha calcium sulphate hemihydrate having an average particle size of less than 4Ám, preferably 2-3Ám, and a solvent uptake of at least 0.85 ml of toluene/g, prepared by a defined two-stage grinding process (see Division Cl). A vibratory ball mill for use in the first stage of the grinding has a charge of 15-25 mm. steel balls in an upper tube and 10-20 mm steel balls in a lower tube. The charge occupies 70% of the tube volume. The mill has a circle of vibration of 10-12mm at 1000 r.p.m. The ground material is subsequently fed to a beater mill, pin mill or an impact mill with a sieve.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712115808 DE2115808C3 (en) | 1971-04-01 | 1971-04-01 | Process for the production of finely ground α-calcium sulfate hemihydrate |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1387178A true GB1387178A (en) | 1975-03-12 |
Family
ID=5803516
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1518772A Expired GB1387178A (en) | 1971-04-01 | 1972-03-30 | Preparation of finely divided calcium sulphate hemihydrate |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2115808C3 (en) |
FR (1) | FR2131775A5 (en) |
GB (1) | GB1387178A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0008947A1 (en) * | 1978-09-05 | 1980-03-19 | United States Gypsum Company | Method of treating calcined gypsum and manufacture of gypsum board therefrom |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2336220C2 (en) * | 1973-07-17 | 1983-08-18 | Gypsum Research S.A., Genève | Process for the production of fiber-containing structures |
CN115193569A (en) * | 2022-07-26 | 2022-10-18 | 一夫科技股份有限公司 | Preparation method of superfine calcium sulfate |
-
1971
- 1971-04-01 DE DE19712115808 patent/DE2115808C3/en not_active Expired
-
1972
- 1972-03-30 GB GB1518772A patent/GB1387178A/en not_active Expired
- 1972-03-31 FR FR7211549A patent/FR2131775A5/fr not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0008947A1 (en) * | 1978-09-05 | 1980-03-19 | United States Gypsum Company | Method of treating calcined gypsum and manufacture of gypsum board therefrom |
Also Published As
Publication number | Publication date |
---|---|
DE2115808C3 (en) | 1978-03-16 |
FR2131775A5 (en) | 1972-11-10 |
DE2115808B2 (en) | 1976-03-18 |
DE2115808A1 (en) | 1972-10-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PE20 | Patent expired after termination of 20 years |