GB1262083A - alpha-CALCIUM SULPHATE HEMIHYDRATE - Google Patents
alpha-CALCIUM SULPHATE HEMIHYDRATEInfo
- Publication number
- GB1262083A GB1262083A GB2549568A GB2549568A GB1262083A GB 1262083 A GB1262083 A GB 1262083A GB 2549568 A GB2549568 A GB 2549568A GB 2549568 A GB2549568 A GB 2549568A GB 1262083 A GB1262083 A GB 1262083A
- Authority
- GB
- United Kingdom
- Prior art keywords
- calcium sulphate
- modifier
- sulphate hemihydrate
- gypsum
- powdered
- 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
- 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.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2549568A GB1262083A (en) | 1968-05-28 | 1968-05-28 | alpha-CALCIUM SULPHATE HEMIHYDRATE |
| FR1599625D FR1599625A (en) | 1968-05-28 | 1968-12-30 | |
| IE70469A IE32810B1 (en) | 1968-05-28 | 1969-05-22 | Alpha-calcium sulphate hemihydrate |
| NO212269A NO124990B (en) | 1968-05-28 | 1969-05-23 | |
| SE741869A SE366531B (en) | 1968-05-28 | 1969-05-27 | |
| DK288669A DK131772C (en) | 1968-05-28 | 1969-05-28 | PROCEDURE FOR MANUFACTURE OF ALFA SEMIHYDRATE PLASTER |
| NL6908130A NL6908130A (en) | 1968-05-28 | 1969-05-28 | |
| DE19691927015 DE1927015B2 (en) | 1968-05-28 | 1969-05-28 | PROCESS FOR THE PRODUCTION OF ALPHA-HEMIHYDRATE PLASTER |
| LU58733D LU58733A1 (en) | 1968-05-28 | 1969-05-28 | |
| BE733737D BE733737A (en) | 1968-05-28 | 1969-05-28 |
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 (1)
| Publication Number | Publication Date |
|---|---|
| GB1262083A true GB1262083A (en) | 1972-02-02 |
Family
ID=10228621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2549568A Expired GB1262083A (en) | 1968-05-28 | 1968-05-28 | 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2684852A3 (en) * | 2012-07-12 | 2014-10-15 | Knauf Gips KG | Method for manufacturing plaster of Paris |
| CN106044826A (en) * | 2016-05-26 | 2016-10-26 | 东南大学 | Crystal modifier for producing alpha type high-strength gypsum |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1547423A (en) * | 1975-03-31 | 1979-06-20 | Japan Government | Gypsum whisker composites |
| 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 |
-
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 LU LU58733D patent/LU58733A1/xx unknown
- 1969-05-28 DE DE19691927015 patent/DE1927015B2/en not_active Withdrawn
- 1969-05-28 NL NL6908130A patent/NL6908130A/xx unknown
- 1969-05-28 DK DK288669A patent/DK131772C/en active
- 1969-05-28 BE BE733737D patent/BE733737A/xx unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2684852A3 (en) * | 2012-07-12 | 2014-10-15 | Knauf Gips KG | Method for manufacturing plaster of Paris |
| CN106044826A (en) * | 2016-05-26 | 2016-10-26 | 东南大学 | Crystal modifier for producing alpha type high-strength gypsum |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1599625A (en) | 1970-07-15 |
| DE1927015B2 (en) | 1976-12-16 |
| LU58733A1 (en) | 1969-09-12 |
| SE366531B (en) | 1974-04-29 |
| IE32810L (en) | 1969-11-28 |
| NL6908130A (en) | 1969-12-02 |
| DK131772B (en) | 1975-09-01 |
| DE1927015A1 (en) | 1969-12-04 |
| NO124990B (en) | 1972-07-03 |
| IE32810B1 (en) | 1973-12-12 |
| BE733737A (en) | 1969-11-03 |
| DK131772C (en) | 1976-02-02 |
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