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US 12,391,598 B2Granted
Production of glass sand
OwnerCynthia Andela, David Martininventors
Life of this patent
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Abstract
A system for producing a stream of glass sand from mixed recyclables comprises first and second pulverizing system, each comprising a size-reducing pulverizer and a size-separating trommel. The pulverizers and trommels are heated, so as to also serve as driers.
Claims9
A system for producing glass sand from a stream of mixed recycled material, comprising:
- a first pulverizing system, comprising a surge hopper, a pulverizer and a trommel, for performing first size-reduction and size-separation steps;
- a second pulverizing system, comprising a pulverizer and a trommel, for performing second size-reduction and size-separation steps;
- a conveyor connecting said first and second pulverizing systems;
- and
- a burner for providing heated air to said pulverizers and trommels,
- whereby said pulverizers and trommels also serve as dryers.
3 more elements
A method of producing glass sand from a mixed waste stream, comprising the following steps:
- admitting a stream of mixed wastes to a first pulverizer, in which glass in the waste stream is pulverized to particles of at least a first minimum size while other materials in the waste stream are not reduced in size;
- admitting the pulverized glass and other materials to a first trommel in which a size-based separation step is performed in order to separate the pulverized glass particles from the other materials;
- admitting the pulverized glass to a second pulverizer, to further reduce the size of the pulverized glass particles;
- admitting the further-reduced glass particles to a second trommel, in which the glass particles are sorted by size into different streams;
- and
- collecting the differently-sized streams of glass particles;
- and
- wherein streams of heated air are provided to each of the first and second pulverizers and the first and second trommels, whereby the glass particles are dried.
5 more elements
Dependencies are inferred from the claim text.