Abstract:
Method and apparatus for excavating and removing a settled body of discrete mineral solids (e.g., a tailings pond from a mining operation) by procedures which progress downwardly from the surface of the body. High pressure streams of liquid are traversed along a path in a pulping zone lowermost in first region of the body. The liquid forms a pumpable slurry with the mineral solids in the zone, and the slurry is then pumped from the zone leaving an undercut cavity sufficient to cause collapse of the overburden of solids. The collapsed overburden is then formed into additional pumpable slurry which is removed by pumping. Successive stages of excavation are carried out by moving the streams of liquid downwardly to a second region where the foregoing steps are repeated. In the apparatus a caisson is disposed vertically in the body and stabilized by means of a plurality of circumferentially positioned pilings. A plurality of high velocity nozzles are mounted in the caisson to direct liquid streams into a pulping zone surrounding the caisson. The slurry which is formed in the pulping zone flows through portals in the caisson into a slurry sump in the lower end of the caisson where a pump removes the slurry through a discharge line leading from the caisson. In one embodiment the caisson is fixedly secured to the caisson and jets are provided to direct liquid streams into regions below the lower ends of the caisson and pilings to sink the apparatus downwardly to the next lower region for additional stages of excavation. In another embodiment, the caisson is mounted for relative vertical movement with respect to stationary pilings.
Abstract:
An eductor jet pump including a venturi throat mounted at the input end of a discharge line into which a high velocity fluid jet nozzle is directed. Hydraulic cylinders and a hydraulic control circuit provide for relative movement of the jet nozzle toward or away from the venturi throat for either pulsating operation by regular cycling of the nozzle portion, for specific control of efficiency by nozzle position, or for closing the venturi throat to prevent backflow.
Abstract:
A continuously operating means excavates gravel, ore or a like particulate material from the earth and drops it onto an inclined grate having large openings. The grate retains rocks and other non-pumpable material, and the balance of the particulate material drops into a hopper fitted with a traveling water jet in the bottom thereof that converts the material within its vicinity to a slurry. The slurry flows from the hopper into a sump and is pumped by pump means from the sump through transfer conduits to a point of discharge.
Abstract:
Particulate material to be washed and sized is fed downwardly into the tank through the vertical perforated feed passageway and onto the perforated cone member and the surrounding perforated separator plate. Water under pressure discharged radially outwardly from the rotating nozzle mounted within the cone member and particulate material conveyed thereby is directed in a generally semi-circular path by the arcuate walls of the tank and impacts against the outer surface of the perforated passageway breaking up agglomerates of sticky clay containing mineral values and forcing water and small particles of material through the perforations in the passageway and back into the interior of the feed passageway. Small, sized particles pass downwardly through the perforations in the separator plate and cone member and into a sump while large particles which cannot pass through the perforations collect on the floor of the tank outwardly of the separator plate.