Dewatering system
AssigneeFairchild Incorporated
InventorCharles A. Lee
Life of this patent
Estimating the term…
Abstract
A system for separating solids from a slurry containing liquids and solids including an elongated plate having spaced apart openings therethrough, a pair of superposed endless screens supported for sliding movement on the upper surface of the plate. A pond of the slurry is formed over a portion of the run of the screens. A vacuum chamber is provided on the side of the plate opposite the side supporting the screens to draw liquid from the pond through the screens. A roll nip is provided to engage the screens to apply pressure to material on the screens at the nip. Various screen constructions and operating parameters are also disclosed.
Claims9
A system for separating solids from a slurry containing liquids and solids comprising in combination:
- an elongated plate having spaced apart openings therethrough, said plate being disposed at an angle to the horizontal with one end higher than the other,
- a first endless screen, said first screen being woven with a coarse mesh from filaments of relatively large diameter to provide knuckles,
- one run of said first screen being trained over and supported for sliding movement on the upper surface of said plate from its lower end to its upper end,
- a second endless screen, said screen being woven with a fine mesh from filaments of relatively small diameter to provide a low void volume and a relatively smooth surface,
- one run of said second screen being supported upon the run of said first screen which is supported on said plate,
- means for forming a pond of the slurry over a portion of the run of said second screen at its lower end,
- means for moving said screens as a unit over said plate from its lower end toward its upper end including a first roll over which said screens are trained,
- said first roll being disposed at the upper end of said plate,
- a second roll engaging said screens on said first roll to form a nip, said nip being positioned upstream relative to the direction of movement of said screens from the highest point on said first roll,
- means for biasing said first and second rolls together to apply pressure at said nip,
- a vacuum chamber on the side of said plate opposite the side supporting said first screen, said vacuum chamber extending over the openings in said plate,
- means for drawing a vacuum on said vacuum chamber, and
- means for removing solids from the surface of said second roll and from said second screen.
A system for separating solids from a slurry containing liquids and solids comprising in combination:
- an elongated plate having spaced apart openings therethrough, said plate being disposed at an angle to the horizontal with one end higher than the other,
- a first endless screen, said first screen being woven with a coarse mesh from filaments of relatively large diameter with a satin weave to provide elongated knuckles on one side of the screen which are oriented in the machine direction of said first screen,
- one run of said first screen being trained over and supported for sliding movement on the upper surface of said plate from its lower end to its upper end, the elongated knuckles oriented in the machine direction being in contact with said plate,
- a second endless screen, said screen being woven with a fine mesh from filaments of relatively small diameter with a satin weave to provide elongated knuckles on one side of the screen which are oriented in the machine direction of said second screen,
- one run of said second screen being supported upon the run of said first screen which is supported on said plate, the side of said second screen which includes the elongated machine direction knuckles being out of contact with first screen,
- means for forming a pond of the slurry over a portion of the run of said second screen at its lower end, means for moving said screens as a unit over said plate from its lower end toward its upper end including a first roll over which said screens are trained, said first roll being disposed at the upper end of said plate,
- a second roll engaging said screens on said first roll to form a nip, said nip being positioned upstream relative to the direction of movement of said screens from the highest point on said first roll,
- means for biasing said first and second rolls together to apply pressure at said nip,
- a vacuum chamber on the side of said plate opposite the side supporting said first screen, said vacuum chamber extending over the openings in said plate,
- means for drawing a vacuum on said vacuum chamber, and
- means for removing solids from the surface of said second roll and from said second screen.
Dependencies are inferred from the claim text.