FI93943B - Calcium sulphate alpha-mono:hydrate mfr. by autoclaving di:hydrate - mouldings obtd. from powder have controlled porosity, fully converted crystals are controlled from acicular to squat columnar - Google Patents

Calcium sulphate alpha-mono:hydrate mfr. by autoclaving di:hydrate - mouldings obtd. from powder have controlled porosity, fully converted crystals are controlled from acicular to squat columnar

Info

Publication number
FI93943B
FI93943B FI900126A FI900126A FI93943B FI 93943 B FI93943 B FI 93943B FI 900126 A FI900126 A FI 900126A FI 900126 A FI900126 A FI 900126A FI 93943 B FI93943 B FI 93943B
Authority
FI
Finland
Prior art keywords
pref
hydrate
mouldings
controlled
obtd
Prior art date
Application number
FI900126A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI900126A0 (en
FI93943C (en
FI900126A (en
Inventor
Thomas Koslowski
Original Assignee
Pro Mineral Ges
Sicowa Verfahrenstech
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
Priority claimed from DE3816513A external-priority patent/DE3816513C3/en
Priority claimed from EP88120944A external-priority patent/EP0342272B1/en
Priority claimed from PCT/EP1989/000512 external-priority patent/WO1989010905A1/en
Application filed by Pro Mineral Ges, Sicowa Verfahrenstech filed Critical Pro Mineral Ges
Publication of FI900126A0 publication Critical patent/FI900126A0/en
Publication of FI900126A publication Critical patent/FI900126A/en
Publication of FI93943B publication Critical patent/FI93943B/en
Application granted granted Critical
Publication of FI93943C publication Critical patent/FI93943C/en

Links

Landscapes

  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

Mouldings of fine gypsum dihydrate contg. 15-60 vol.% porosity and over 5 vol.% air in pores are heated with water in autoclave at 110-180 deg.C under controlled pressure to recrystallise to alpha-hemihydrate. Mouldings are pref. placed in autoclave at room temp. so that water condensed on surface isdrawn into pores by capillary action; also part of water pref. arises from dihydrate -at least 50 vol.% of porosity pref. contains air. Mouldings are pref. formed at 14N/mm2 in presence of 3-20 wt.% physically bonded water. Growth controlling additives are pref. mixed with dihydrate and are pref. fine brown coal, peat, wood, humic acid, timber prods. or mixt. thereof. Portion of dihydrate pref. is obtd. from gas desulphurisation plant in power station fired on brown coal.
FI900126A 1988-05-14 1990-01-10 Process for the preparation of calcium sulphate-hemihydrate FI93943C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE3816513A DE3816513C3 (en) 1987-05-22 1988-05-14 Process for producing calcium sulfate alpha hemihydrate from finely divided calcium sulfate and its use
DE3816513 1988-05-14
EP88120944A EP0342272B1 (en) 1987-05-22 1988-12-15 Process for the treatment of alpha-calciumsulphate-hemihydrate
EP88120944 1988-12-15
EP8900512 1989-05-10
PCT/EP1989/000512 WO1989010905A1 (en) 1987-05-22 1989-05-10 Process for preparing calcium sulphate alpha hemihydrate

Publications (4)

Publication Number Publication Date
FI900126A0 FI900126A0 (en) 1990-01-10
FI900126A FI900126A (en) 1990-01-10
FI93943B true FI93943B (en) 1995-03-15
FI93943C FI93943C (en) 1995-06-26

Family

ID=25868102

Family Applications (1)

Application Number Title Priority Date Filing Date
FI900126A FI93943C (en) 1988-05-14 1990-01-10 Process for the preparation of calcium sulphate-hemihydrate

Country Status (5)

Country Link
JP (1) JPH03500877A (en)
AT (1) ATE62648T1 (en)
CA (1) CA1338921C (en)
DK (1) DK9090A (en)
FI (1) FI93943C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6964704B2 (en) * 2003-03-20 2005-11-15 G.B. Technologies, Llc Calcium sulphate-based composition and methods of making same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2462369C2 (en) * 1973-12-11 1984-05-17 Union Carbide Corp., New York, N.Y. Process for the preparation of a pitch containing mesophase
JPS51112798A (en) * 1975-03-31 1976-10-05 Babcock Hitachi Kk Process for granulation of by-product gypsum from exhausted gas desulf urizer
US4065320A (en) * 1975-05-13 1977-12-27 Allis-Chalmers Corporation System for handling high sulfur materials
JPS5614616A (en) * 1979-07-16 1981-02-12 Roozan Eng Corp Self seal type flange device
JPS5618551A (en) * 1979-07-26 1981-02-21 Morinaga & Co Ltd Preparation of multilayered ice cream
JPS573622A (en) * 1980-06-10 1982-01-09 Tokyo Optical Apparatus for detecting operation distance in ophthalmology
JPS5721501A (en) * 1980-07-14 1982-02-04 Reonitsuto Kk Shorts and production thereof
JPS5814385A (en) * 1981-07-20 1983-01-27 Toshiba Corp Digital disc player

Also Published As

Publication number Publication date
FI900126A0 (en) 1990-01-10
DK9090D0 (en) 1990-01-12
CA1338921C (en) 1997-02-25
DK9090A (en) 1990-03-12
ATE62648T1 (en) 1991-05-15
FI93943C (en) 1995-06-26
JPH03500877A (en) 1991-02-28
FI900126A (en) 1990-01-10

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Legal Events

Date Code Title Description
BB Publication of examined application
MM Patent lapsed
MM Patent lapsed

Owner name: SICOWA VERFAHRENSTECHNIK FUER BAUSTOFFE

Owner name: PRO MINERAL GESELLSCHAFT ZUR VERWENDUNG