Solid material comminution or disintegration – Processes
Patent
1974-08-19
1976-07-20
Custer, Jr., Granville Y.
Solid material comminution or disintegration
Processes
241 65, 241DIG38, 241 23, B02C 1912
Patent
active
039702545
ABSTRACT:
Glass is recovered for use as cullet from mixtures of broken glass with pieces of metal and other heat resistant materials by a method wherein the mixture is thermally shocked by subjecting it to a rapid increase or decrease in temperature to induce cracks in and/or break-up of the glass particles, while the nonglass particles remain unchanged because of their nature, and the mixture is mechanically treated, by agitating or the like, so that the glass particles are broken up by further propagation of the induced cracks. Prior to the mechanical treatment, and preferably prior to the thermal shock treatment, the mixture is screened or otherwise treated to eliminate fines of all kinds. After the mechanical treatment, the mixture is further screened so that the glass particles, which have been reduced in size, can be recovered as the undersized fraction, while the nonglass particles, which have remained generally the same size, are retained on the screen. A number of modifications are disclosed.
REFERENCES:
patent: 1679857 (1928-08-01), Hewitt
patent: 1718264 (1929-06-01), Walton
patent: 2029253 (1936-01-01), Walker
patent: 3407053 (1968-10-01), Schulz
patent: 3734756 (1973-05-01), Pierce
Black Clawson Fibreclaim Inc.
Custer, Jr. Granville Y.
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