Patent ID: 7144447
Filing Date: 2006-12-05
Classification: B04C,C21B,F27B,Y02P

Abstract:
1. A process for reducing material in particle form in a fluidization zone at elevated temperature, the method comprising: holding the material in particle form in the fluidization zone by flowing a treatment gas upward from below the fluidization zone into the fluidization zone; discharging a stream of treatment gas from the fluidization zone with material in fine particle form entrained therein; feeding the stream of treatment gas and entrained material in fine particle form to a separating unit; separating the fine particle material from the treatment gas in the separating unit; extracting the separated treatment gas from the separating unit as off-gas and delivering the separated fine particle material to a solids discharge line; and introducing a coarse-grained material at one or more locations in the flow path of the treatment gas and/or fine particle material from the fluidization zone such that the coarse-grained material and the discharged fine particle material travel together in the solids discharge line.