Production of glass powder from waste glass, and products made using the same, especially concrete
First Claim
1. 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.
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Accused Products
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.
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Citations
23 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process for the production of a glass powder of maximum mean dimension from a stream of post-consumer waste glass containing non-frangible items, comprising the following steps, performed in the sequence given:
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pulverizing the stream in a manner such that glass in said stream is reduced to fragments of a predetermined average maximum size, 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;
drying the washed glass fragments; and
grinding the dried glass fragments into a powder, the particles of said powder being of no more than a predetermined maximum average particle size. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. Apparatus for the production of a glass powder of maximum mean dimension from a stream of post-consumer waste glass containing non-frangible items, comprising:
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equipment for pulverizing the stream in a manner such that glass in said stream is reduced to fragments of a predetermined average maximum size, while non-frangible items are not reduced to said size, equipment for performing a size-based separation of said reduced glass fragments from said non-frangible items;
equipment for washing said reduced glass fragments;
equipment for drying the washed glass fragments; and
equipment for grinding the dried glass fragments into a powder, the particles of said powder being of no more than a predetermined maximum average particle size. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification