C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 18/16 (2006.01) B01J 20/04 (2006.01) B09B 3/00 (2006.01) C04B 11/26 (2006.01) C04B 28/14 (2006.01)
Patent
CA 2236486
A commercially useful material is produced from waste gyproc boards containing calcium sulfate dihydrate, by a method comprising the steps of (a) grinding the waste gyproc boards to obtain particles having a substantially uniform size; (b) drying the particles obtained in step (a) to obtain moisture-free particles; (c) heating the moisture-free particles obtained in step (b) at a temperature of 128 to 162°C to convert the calcium sulfate dihydrate to calcium sulfate hemihydrate; (d) adding water to the product obtained in step (c) to form a paste; (e) forming the paste obtained in step (d) into a shaped product of a predetermined size; and (f) drying the shaped product obtained in step (e) at a temperature of 105 to 120°C to obtain a commercially useful material. The materials produced by the method of the invention can be used for a variety of industrial and household purposes. Typical uses include the absorption of oil, grease and chemicals on floors and elsewhere, in animal toilet applications as a cat box absorbent, as carriers for chemicals, such as pesticides and herbicides, in various agricultural and horticultural applications. They can also be used as fillers for agricultural and horticultural applications. When admixed with an adhesive agent such as Portland cement, epoxy or polyester adhesives, they can be applied onto walls and/or floors to provide a decorative coating.
Beshay Alphonse
Marcoux Gaetan
Marcoux Gaetan
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Recypro Technologie Inc.
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