IE32810B1 - Alpha-calcium sulphate hemihydrate - Google Patents
Alpha-calcium sulphate hemihydrateInfo
- Publication number
- IE32810B1 IE32810B1 IE70469A IE70469A IE32810B1 IE 32810 B1 IE32810 B1 IE 32810B1 IE 70469 A IE70469 A IE 70469A IE 70469 A IE70469 A IE 70469A IE 32810 B1 IE32810 B1 IE 32810B1
- Authority
- IE
- Ireland
- Prior art keywords
- calcium sulphate
- modifier
- sulphate hemihydrate
- gypsum
- powdered
- Prior art date
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
- C04B11/024—Ingredients added before, or during, the calcining process, e.g. calcination modifiers
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
1,262,083. α-Calcium sulphate hemihydrate. BPB INDUSTRIES Ltd. 21 May, 1969 [28 May, 1968], No. 25495/68. Heading C1A. α-Calcium sulphate hemihydrate is prepared by mixing a crystal habit modifier with powdered gypsum, agglomerating the mixture into discrete masses such as pellets or briquettes and calcining these masses in an autoclave containing saturated steam preferably under a steam pressure of between 20 and 75 p.s.i.g. The crystal modifier is suitably succinic, maleic, citric, phthalic or malic acid, a soluble salt thereof or a derivative such as methyl succinate and itaconic acid, and can be intimately dispersed throughout the powdered gypsum either in a powdered form or by spraying or otherwise moistening the gypsum with a solution of the modifier. After calcining and drying, the product may be ground down to give the desired "normal consistency" (defined). In the examples the milled products consisted of crystals between 30 and 50 microns in size and had surface areas between about 7000 and 8000 sq. cm./g.
[GB1262083A]
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2549568A GB1262083A (en) | 1968-05-28 | 1968-05-28 | alpha-CALCIUM SULPHATE HEMIHYDRATE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE32810L IE32810L (en) | 1969-11-28 |
| IE32810B1 true IE32810B1 (en) | 1973-12-12 |
Family
ID=10228621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE70469A IE32810B1 (en) | 1968-05-28 | 1969-05-22 | Alpha-calcium sulphate hemihydrate |
Country Status (10)
| Country | Link |
|---|---|
| BE (1) | BE733737A (en) |
| DE (1) | DE1927015B2 (en) |
| DK (1) | DK131772C (en) |
| FR (1) | FR1599625A (en) |
| GB (1) | GB1262083A (en) |
| IE (1) | IE32810B1 (en) |
| LU (1) | LU58733A1 (en) |
| NL (1) | NL6908130A (en) |
| NO (1) | NO124990B (en) |
| SE (1) | SE366531B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1547424A (en) * | 1975-03-31 | 1979-06-20 | Japan Government | Method of producing needlelike 11-anhydrite gypsum |
| DE3222865C2 (en) * | 1981-07-10 | 1992-10-22 | Steag Ag, 4300 Essen | Method for granulating plaster of paris produced in chemical processes and using a compacting device for granulating plaster of paris according to the method |
| DE3502637A1 (en) * | 1985-01-26 | 1986-09-11 | Frank W. Dr.-Ing. 6600 Saarbrücken Fink | Process for calcining lumpy flue gas desulphurisation gypsum by steam action |
| DE3711367A1 (en) * | 1987-04-04 | 1988-10-13 | Rwk Rhein Westfael Kalkwerke | Process for preparing calcium sulphate hemihydrate |
| DE3816513C3 (en) * | 1987-05-22 | 1998-10-01 | Pro Mineral Ges | Process for producing calcium sulfate alpha hemihydrate from finely divided calcium sulfate and its use |
| DE3844938C2 (en) * | 1987-05-22 | 1996-09-19 | Pro Mineral Ges | Calcium sulphate alpha-mono:hydrate mfr. by autoclaving di:hydrate |
| DE4217978A1 (en) * | 1992-05-30 | 1993-12-02 | Heidelberger Zement Ag | Process for the production of ALPHA hemihydrate from calcium sulfate dihydrate in a reactor |
| RS58239B1 (en) * | 2012-07-12 | 2019-03-29 | Knauf Gips Kg | Method for manufacturing of calcium sulfate beta hemihydrate |
| CN106044826A (en) * | 2016-05-26 | 2016-10-26 | 东南大学 | Crystal modifier for producing alpha type high-strength gypsum |
-
1968
- 1968-05-28 GB GB2549568A patent/GB1262083A/en not_active Expired
- 1968-12-30 FR FR1599625D patent/FR1599625A/fr not_active Expired
-
1969
- 1969-05-22 IE IE70469A patent/IE32810B1/en unknown
- 1969-05-23 NO NO212269A patent/NO124990B/no unknown
- 1969-05-27 SE SE741869A patent/SE366531B/xx unknown
- 1969-05-28 NL NL6908130A patent/NL6908130A/xx unknown
- 1969-05-28 BE BE733737D patent/BE733737A/xx unknown
- 1969-05-28 DE DE19691927015 patent/DE1927015B2/en not_active Withdrawn
- 1969-05-28 LU LU58733D patent/LU58733A1/xx unknown
- 1969-05-28 DK DK288669A patent/DK131772C/en active
Also Published As
| Publication number | Publication date |
|---|---|
| DK131772B (en) | 1975-09-01 |
| SE366531B (en) | 1974-04-29 |
| LU58733A1 (en) | 1969-09-12 |
| BE733737A (en) | 1969-11-03 |
| IE32810L (en) | 1969-11-28 |
| DE1927015B2 (en) | 1976-12-16 |
| DK131772C (en) | 1976-02-02 |
| GB1262083A (en) | 1972-02-02 |
| NO124990B (en) | 1972-07-03 |
| NL6908130A (en) | 1969-12-02 |
| FR1599625A (en) | 1970-07-15 |
| DE1927015A1 (en) | 1969-12-04 |
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