Patent ID: 7562777

Claim:
A flotation cell injector assembly for use with open or closed flotation de-inking modules for recycled paper comprising: a) a flotation cell for separating foam containing contaminants from a decontaminated slurry, said flotation cell having a pulp slurry feed line; b) a housing member connected to said slurry feed line comprising: i) a substantially hollow cylindrical body; ii) a pair of opposing flanges disposed on the ends of said body including means for installing said housing in line with said feed line; and iii) at an air intake port centrally disposed on said body; b) a plurality of injectors within said housing for injecting air into said slurry prior to entering said flotation cell, each injector comprising: i) a first elongate cylinder forming an ingress nozzle for receiving slurry at an entrance thereof; and ii) a second elongate cylinder having and interior diameter greater than the exterior diameter of said ingress nozzle forming an egress nozzle for discharging a gasified slurry into said slurry feed line connected to said flotation cell, said ingress nozzle extending into said egress nozzle whereby an air entrance into said egress nozzle is formed in an annular opening surrounding said ingress nozzle; c) a plurality of injector nozzle support plates disposed within said housing body for supporting said injectors wherein an adjacent pair of support plates form an air chamber surrounding the air entrances into the egress nozzles, said air chamber having an air inlet; and d) said flotation cell having an accept line for discharging decontaminated slurry and a reject nozzle for discharging the foam containing contaminants.