Abstract: Electrically charged particulates in a gas stream are filtered from the gas stream by a filter medium comprising a porous cake composed of electrically charged particulates previously drawn from the gas stream and collected on a foraminous support structure, where the apertures of the foraminous support structure are larger than the average size of the particulates to be filtered from the gas stream by more than an order of magnitude.

Abstract: Process for color sorting of particulate glass employing as the basic concept the differential heating by irradiation and absorption of preselected colored glass particles and contacting such irradiated and differentially heated glass particles with an organic thermoplastic material which melts over a narrow temperature range, the preselected colored glass particles being heated by such irradiation to within the aforementioned temperature range and causing melting of the organic thermoplastic material in contact with such glass particles but without causing melting of the inorganic thermoplastic material in contact with the other glass particles, and thereby enabling separation of the differentially heated colored glass particles in contact with the melted organic material from the remaining glass particles.