Fine grit classifier
AssigneeRDP Technologies, Inc.
InventorRichard W. Christy
Life of this patent
Estimating the term…
Abstract
A fine grit classifier for removing grit from a milk of lime slurry includes a settling tank for receiving the milk of lime slurry, means for creating turbulence inside the tank to promote grit settling, a launder for collecting milk of lime slurry from an upper portion of the settling tank and directing milk of lime slurry to an outlet, and an auger for transporting settled grit from the lower portion of the settling tank and discharging the settled grit.
Claims20
A fine grit classifier for removing grit from a milk of lime slurry, the fine grit classifier including:
- a settling tank for receiving the milk of lime slurry, the settling tank providing a predetermined water line for the milk of lime slurry, the settling tank having a lower portion below the water line and an upper portion above the water line;
- an inlet for delivering the milk of lime slurry to the settling tank;
- an outlet for discharging clarified milk of lime slurry from the settling tank;
- at least one launder for collecting milk of lime slurry from the upper portion of the settling tank and directing milk of lime slurry to the outlet, the at least one launder including at least one weir;
- at least one auger having a lower end and an upper end for transporting settled grit from the lower portion of the settling tank to the upper portion of the settling tank and discharging the settled grit from the fine grit classifier.
A process for removing fine grit from a milk of lime slurry with a fine grit classifier having a plurality of fluid zones when charged with a milk of lime slurry, the plurality of zones including upper, middle and lower zones, the method comprising:
- providing a milk of lime slurry to a fine grit classifier at a temperature from 10 to 140 degrees Fahrenheit about ambient water temperature;
- creating turbulence in the middle zone while at least partially shielding the lower zone from the turbulence to encourage grit to separate from the milk of lime slurry;
- permitting grit to settle to the lower zone;
- transporting settled grit from the lower zone out of the milk of lime slurry to provide grit wet by the milk of lime slurry;
- pemitting the milk of lime slurry wetting to drain from the grit;
- collecting milk of lime slurry from the upper zone, the milk of lime slurry having reduced grit;
- and
- discharging grit from the classifier.
Dependencies are inferred from the claim text.