Method of producing recycled hardened materials using waste...

Details Method of producing recycled hardened materials using waste... Method of producing recycled hardened materials using waste...

C - Chemistry, Metallurgy

04

B

C04B 7/24 (2006.01) C04B 7/04 (2006.01)

Patent

CA 2594379

Disclosed herein is a method for producing a recycled hardened material using waste gypsum. The method comprises treating acidic wastewater generated in the production of copper, zinc or titanium or the production of sodium hydroxide (caustic soda) and chlorine using saline water, with calcium hydroxide (slaked lime), so as to precipitate sludge, and mixing the precipitated sludge with pulp sludge ashes having pozzolanic properties.

L'invention concerne un procédé de production de matériaux durcis recyclés avec du gypse résiduaire. Le procédé consiste à traiter avec de l'hydroxyde de calcium (chaux délitée) des eaux usées acides résultant de la production de cuivre, de zinc ou de titane, ou de la production d'hydroxyde de sodium (soude caustique) et de chlore réalisée avec de l'eau saline, de façon à précipiter les boues. Le procédé consiste ensuite à mélanger les boues précipitées avec des cendres de boues en pâte présentant des propriétés pouzzolaniques.

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