Process for expanding and coating perlite USG Corporation
Jun 25, 1985· 1. A process for manufacturing expanded perlite of the type in which (a) perlite ore and a stream of hot gases at a temperature above the softening point of perlite are fed to an expansion chamber, (b) hot expanded perlite in a stream of hot exhaust gases are withdrawn from the expansion zone and conveyed to a separation zone, and