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...

2005-07-07

2010-06-08

Wood, Elizabeth D (Department: 1793)

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

C106S672000, C106S675000, C106S677000, C106S679000, C106S680000, C106S661000, C106S667000, C106S697000, C106S698000, C106S704000, C106S705000

Reexamination Certificate

active

07731792

ABSTRACT:
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.

REFERENCES:
patent: 4339273 (1982-07-01), Meier et al.
patent: 5338357 (1994-08-01), Takai et al.
patent: 5346549 (1994-09-01), Johnson
patent: 5362319 (1994-11-01), Johnson
patent: 678488 (1998-09-01), None
patent: 06-144898 (1994-05-01), None
patent: 2000-344564 (2000-12-01), None
Abstract of KPA 1020030049959, Jan. 21, 2005.

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