B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/104, 25/117
B28B 1/00 (2006.01) C04B 28/14 (2006.01)
Patent
CA 1077245
ABSTRACT OF THE DISCLOSURE Process for prop preparing shaped articles from gypsum (CaSO4.2H2O),by compressing calcium sulphate dihydrate and additives to form articles. The process is characterized in that in moist, non-calcined calcium sulphate dihydrate of any origin one or several addivites, with the exception of calcium sulphate hemihydrate, is admixed and the gypsum slurry compressed at a pressure of at least 200 kg/cm2 and thereafter dried. Chemical gypsum containing soluble phasphates, fluorides and/or ammonium sulphate up to about 2% by weight or cement the ground blast-furnace sing in a quantity of up to 10% by weight, referred to the dry gypsum is started form. Preferred as a additive is urea formaldehyde resin in a quantity of less than 3% by weight referred to the dry gypsum, preferably 1-4% by weight, and more preferably approximately 1% by weight in the combination of chemical gypsum of acid reaction.
232971
Na
Unie Van Kunstmestfabrieken B.v.
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