Method of recovery of glass from municipal waste
First Claim
1. In a process for the recovery of glass from municipal waste, including the steps of shredding said waste, subjecting said shredded waste to treatment in an air classifier, recovering a portion of the resulting air classified shredded waste containing glass, and subjecting said recovered portion of shredded waste to treatment on an air table;
- the improvement which comprises the steps of recovering the overhead material including glass from said air classifier, said air classifier being operated under conditions such that the glass contained in said overhead material has a particle size smaller than about 6 mesh, screening said overhead material obtained from said air classifier, recovering a screened material enriched in glass and subjecting said screened material to treatment on an air table and recovering as first product a material consisting essentially of fine glass having a particle size less than about 6 mesh and of substantially reduced organics content, and as additional products other inorganics and organics.
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Abstract
Process for recovery of glass from municipal waste, comprising shredding the waste, subjecting the shredded waste containing the glass to treatment in an air classifier, recovering the overhead including glass from the air classifier, the latter being operated under conditions such that the major portion of the glass particles contained in such overhead are of a fineness smaller than about 6 mesh, and usually of a size such that a substantial portion of such glass particles are less than about 20 mesh, screening such overhead fraction and recovering an enriched glass fraction of the aforementioned fineness, subjecting the screened glass-enriched material to treatment on an air table, and recovering a fine glass product of substantially reduced organic content, and having a particle size less than about 6 mesh, with a substantial portion less than about 20 mesh. Such fine glass product containing a substantial portion of glass particles of a size less than 20 mesh, can be employed in construction applications, e.g. in admixture with asphalt to form slurry seal, for production of glass and resin binder sheets, and the like, and may be further beneficiated to sufficient purity for recycle to glass manufacture.
35 Citations
17 Claims
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1. In a process for the recovery of glass from municipal waste, including the steps of shredding said waste, subjecting said shredded waste to treatment in an air classifier, recovering a portion of the resulting air classified shredded waste containing glass, and subjecting said recovered portion of shredded waste to treatment on an air table;
- the improvement which comprises the steps of recovering the overhead material including glass from said air classifier, said air classifier being operated under conditions such that the glass contained in said overhead material has a particle size smaller than about 6 mesh, screening said overhead material obtained from said air classifier, recovering a screened material enriched in glass and subjecting said screened material to treatment on an air table and recovering as first product a material consisting essentially of fine glass having a particle size less than about 6 mesh and of substantially reduced organics content, and as additional products other inorganics and organics.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 13. The process for the recovery of glass from municipal waste, which comprises shredding said waste to produce glass generally having a particle size less than about 1/2 inch, subjecting said shredded waste containing said glass to treatment in an air classifier, recovering the overhead material from said air classifier including glass in the form of particles of a size less than 6 mesh, screening said overhead material obtained from said air classifier, removing a substantial portion of organics and recovering a screened material enriched in glass, subjecting said screened material to treatment on an air table and recovering a glass product consisting essentially of fine glass.
Specification