GB1529435A - Method for producing calcium sulphate hemihydrate and/or anhydrite - Google Patents
Method for producing calcium sulphate hemihydrate and/or anhydriteInfo
- Publication number
- GB1529435A GB1529435A GB4641374A GB4641374A GB1529435A GB 1529435 A GB1529435 A GB 1529435A GB 4641374 A GB4641374 A GB 4641374A GB 4641374 A GB4641374 A GB 4641374A GB 1529435 A GB1529435 A GB 1529435A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crystals
- anhydrite
- calcium sulphate
- sulphate hemihydrate
- hemihydrate
- 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
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)
- Producing Shaped Articles From Materials (AREA)
Abstract
1529435 Calcium sulphate hemihydrate and/or anhydrite FISONS Ltd 21 Oct 1975 [26 Oct 1974] 46413/74 Headings C1A Calcium sulphate hemihydrate and/or anhydrite crystals are obtained by the conversion of gypsum crystals of which at least 50 weight per cent have a length to breadth ratio of from 1:1 to 1:3, and which have a mean thickness of from 3 to 10 micrometres, and wherein initially at least 15%, typically 40 to 80%, by weight of the crystals are in the form of twinned crystals. The gypsum crystals may be those obtained in the process of U.K Specification 1,520,273. The conversion is preferably achieved by wet or dry calcination. The resulting hemihydrate or anhydrite crystals may be slurried in water for use in building products, e.g. plaster, plaster blocks and board. The addition of fibres prior to shaping the product is described and the products obtained possess high strength and fire resistance.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4641374A GB1529435A (en) | 1974-10-26 | 1974-10-26 | Method for producing calcium sulphate hemihydrate and/or anhydrite |
IE227575A IE42025B1 (en) | 1974-10-26 | 1975-10-20 | Method for producing calcium sulphate hemihydrate and/or anhydrite |
NL7512472A NL7512472A (en) | 1974-10-26 | 1975-10-24 | PROCESS FOR THE PREPARATION OF CALCIUMSULPHATHEMIHYDRATE AND / OR CALCIUMSULPHATE ANHYDRITE, PROCESS FOR THE PREPARATION OF A BRIJ USABLE FOR THE MANUFACTURE OF A CONSTRUCTION PRODUCT, MANUFACTURED FOR THE MANUFACTURE MANUFACTURED FOR THE MANUFACTURING THE PRODUCT METHOD. |
IT2865675A IT1049455B (en) | 1974-10-26 | 1975-10-24 | PROCEDURE FOR PREPARING CALCIUM SULPHATE EMIHYDRATE E. OR ANHYDRITE |
JP12755175A JPS5166298A (en) | 1974-10-26 | 1975-10-24 | RYUSANKARUSHIUMUHANSUIEN OYOBI * MATAHA RYUSANKARUSHIUMUMUSUIENNOSEIZOHO |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4641374A GB1529435A (en) | 1974-10-26 | 1974-10-26 | Method for producing calcium sulphate hemihydrate and/or anhydrite |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1529435A true GB1529435A (en) | 1978-10-18 |
Family
ID=10441172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4641374A Expired GB1529435A (en) | 1974-10-26 | 1974-10-26 | Method for producing calcium sulphate hemihydrate and/or anhydrite |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5166298A (en) |
GB (1) | GB1529435A (en) |
IE (1) | IE42025B1 (en) |
IT (1) | IT1049455B (en) |
NL (1) | NL7512472A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116283015A (en) * | 2023-02-24 | 2023-06-23 | 宜都兴发化工有限公司 | Method for preparing self-hardening spherical cement retarder by using double-crystalline phosphogypsum |
-
1974
- 1974-10-26 GB GB4641374A patent/GB1529435A/en not_active Expired
-
1975
- 1975-10-20 IE IE227575A patent/IE42025B1/en unknown
- 1975-10-24 JP JP12755175A patent/JPS5166298A/en active Pending
- 1975-10-24 IT IT2865675A patent/IT1049455B/en active
- 1975-10-24 NL NL7512472A patent/NL7512472A/en not_active Application Discontinuation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116283015A (en) * | 2023-02-24 | 2023-06-23 | 宜都兴发化工有限公司 | Method for preparing self-hardening spherical cement retarder by using double-crystalline phosphogypsum |
Also Published As
Publication number | Publication date |
---|---|
IT1049455B (en) | 1981-01-20 |
IE42025B1 (en) | 1980-05-21 |
NL7512472A (en) | 1976-04-28 |
IE42025L (en) | 1976-04-26 |
JPS5166298A (en) | 1976-06-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |