Method for manufacturing artificial ultra-lightweight...

Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Of clay containing material

Reexamination Certificate

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C264S638000, C264S639000, C264S679000

Reexamination Certificate

active

07597839

ABSTRACT:
This invention relates to a method for manufacturing an artificial ultra-lightweight aggregate having a specific gravity of 0.8-0.9 using raw sewage sludge. According to the invention, raw sewage sludge and water-free waste are mixed into a blend having a water content that allows the optimal extrusion, whereby excellent ultra-lightweight aggregate which has low water absorption rate and, low slump loss can be produced. In addition, the collective treatment of waste and the mass production of recycled products are possible without addition of a drying process for raw sewage sludge, and thus excellent ultra-lightweight aggregate can be supplied at low cost.

REFERENCES:
patent: 4112033 (1978-09-01), Lingl
patent: 4874153 (1989-10-01), Hashimoto et al.
patent: 6440884 (2002-08-01), Devagnanam
patent: 2005/0066860 (2005-03-01), Logan et al.
patent: 2005/0132933 (2005-06-01), Blum
patent: 2006/0070406 (2006-04-01), Raichel et al.
patent: 2006/0278131 (2006-12-01), Hunt
patent: 2008/0179253 (2008-07-01), Clark et al.
patent: 11333 (1996-08-01), None

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