GB1529435A - Method for producing calcium sulphate hemihydrate and/or anhydrite - Google Patents

Method for producing calcium sulphate hemihydrate and/or anhydrite

Info

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
Application number
GB4641374A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fisons Ltd
Original Assignee
Fisons Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fisons Ltd filed Critical Fisons Ltd
Priority to GB4641374A priority Critical patent/GB1529435A/en
Priority to IE227575A priority patent/IE42025B1/en
Priority to IT2865675A priority patent/IT1049455B/en
Priority to JP12755175A priority patent/JPS5166298A/en
Priority to NL7512472A priority patent/NL7512472A/en
Publication of GB1529435A publication Critical patent/GB1529435A/en
Expired legal-status Critical Current

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.
GB4641374A 1974-10-26 1974-10-26 Method for producing calcium sulphate hemihydrate and/or anhydrite Expired GB1529435A (en)

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
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
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.

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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
JPS5166298A (en) 1976-06-08
NL7512472A (en) 1976-04-28
IE42025L (en) 1976-04-26
IT1049455B (en) 1981-01-20
IE42025B1 (en) 1980-05-21

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee