US 2006/0130707 A1Published application

Production of glass powder from waste glass, and products made using the same, especially concrete

AssigneeEmpire Resource Recovery LLC

InventorsLouis Grasso, Louis Grasso, Patrick Grasso, Elliot Kracko, Cynthia Andela, Ralph Acampora

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Abstract

A clean dry glass powder useful as a substitute for Portland cement in concrete, in paints, and for other known uses for glass powder produced conventionally can be produced from unsorted post-consumer waste glass, including a subsatantial fraction of non-glass items, by employing glass pulverizing equipment to reduce waste glass to small fragments, allowing removal of trash, employing a multistep washing process to clean the glass fragments, in the preferred embodiment using aggregate cleaning equipment, drying the fragments, preferably using fluidized bed techniques, and grinding the glass to a desired particle size, preferably using a ball mill, in combination with an air classification step to produce a glass powder of uniform particle size.

Claims23

Dependent claims

A process for the production of concrete, comprising as a pozzolanic constituent a proportion of glass powder produced by processing a stream of post-consumer waste glass containing items of non-frangible materials, comprising the following steps, performed in the sequence given:

producing a dry glass powder comprising particles of which at least a major fraction are of size 325 mesh or finer, and containing no more than about 2% moisture, by:
pulverizing the stream of post-consumer waste glass containing non-frangible constituents such that glass in said stream is reduced to fragments of average maximum size ⅛ inch or less, while non-frangible items are not reduced to said size, and performing a size-based separation of said reduced glass fragments from said non-frangible items;
washing said reduced glass fragments, to separate plastic and paper fragments therefrom, and to remove organic contaminants therefrom;
drying the washed glass fragments to a moisture content of no more than about 2% by weight;
and
grinding the dried glass fragments into a powder, at least about 60% of the particles of said powder being of no more than 325 mesh particle size;
and
mixing said glass powder with a larger quantity of Portland cement, aggregate materials, and water, to form concrete.

5 more elements

Dependencies are inferred from the claim text.