Patent ID: 7147111
Filing Date: 2006-12-12
Classification: B01D,B03B

Abstract:
1. A hindered-settling fluid classifier adapted for processing aggregate entrained in a flowing slurry, said classifier comprising: (a) a classifier tank defined by walls, and comprising an inlet at an upstream end thereof and an outlet at a downstream end thereof; (b) a slurry feed pipe connected to the tank inlet for introducing the aggregate slurry into said classifier tank for processing; (c) a plurality of laterally-extending flow control doors spaced apart along a length of said classifier tank and adapted for interrupting flow of the aggregate slurry downstream from the tank inlet to the tank outlet, said flow control doors defining respective material settling zones each located a progressively greater distance downstream from the tank inlet, and said flow control doors comprising at least two pivoting doors arranged side by side within each of said material settling zones, and said pivoting doors being operable for movement between open and closed positions whereby the flow rate through said classifier tank is adjustable to control settling of aggregate within said material settling zones; (d) means for generating an upwardly rising current in each of said material settling zones to control the settling velocity of aggregate floating downwardly towards a base of said classifier tank; and (e) a plurality of collection hoppers located at the base of said classifier tank and below respective settling zones for collecting and classifying aggregate settling within said zones.