GB1262083A - alpha-CALCIUM SULPHATE HEMIHYDRATE - Google Patents

alpha-CALCIUM SULPHATE HEMIHYDRATE

Info

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
Application number
GB2549568A
Inventor
Gerald Waterworth Cafferata
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.)
BPB Ltd
Original Assignee
BPB Industries PLC
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 BPB Industries PLC filed Critical BPB Industries PLC
Priority to GB2549568A priority Critical patent/GB1262083A/en
Priority to FR1599625D priority patent/FR1599625A/fr
Priority to IE70469A priority patent/IE32810B1/en
Priority to NO212269A priority patent/NO124990B/no
Priority to SE741869A priority patent/SE366531B/xx
Priority to LU58733D priority patent/LU58733A1/xx
Priority to NL6908130A priority patent/NL6908130A/xx
Priority to BE733737D priority patent/BE733737A/xx
Priority to DK288669A priority patent/DK131772C/en
Priority to DE19691927015 priority patent/DE1927015B2/en
Publication of GB1262083A publication Critical patent/GB1262083A/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
    • 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.
GB2549568A 1968-05-28 1968-05-28 alpha-CALCIUM SULPHATE HEMIHYDRATE Expired GB1262083A (en)

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
LU58733D LU58733A1 (en) 1968-05-28 1969-05-28
NL6908130A NL6908130A (en) 1968-05-28 1969-05-28
BE733737D BE733737A (en) 1968-05-28 1969-05-28
DK288669A DK131772C (en) 1968-05-28 1969-05-28 PROCEDURE FOR MANUFACTURE OF ALFA SEMIHYDRATE PLASTER
DE19691927015 DE1927015B2 (en) 1968-05-28 1969-05-28 PROCESS FOR THE PRODUCTION OF ALPHA-HEMIHYDRATE PLASTER

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1547422A (en) * 1975-03-31 1979-06-20 Japan Government Manufacture of 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

Cited By (2)

* Cited by examiner, † Cited by third party
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
SE366531B (en) 1974-04-29
FR1599625A (en) 1970-07-15
IE32810L (en) 1969-11-28
DK131772C (en) 1976-02-02
IE32810B1 (en) 1973-12-12
DK131772B (en) 1975-09-01
DE1927015A1 (en) 1969-12-04
LU58733A1 (en) 1969-09-12
DE1927015B2 (en) 1976-12-16
NO124990B (en) 1972-07-03
NL6908130A (en) 1969-12-02
BE733737A (en) 1969-11-03

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