B - Operations – Transporting – 02 – C
Patent
B - Operations, Transporting
02
C
241/26, 209/3
B02C 19/00 (2006.01) B03B 5/00 (2006.01) B03B 5/02 (2006.01) B03B 5/04 (2006.01) B03B 9/00 (2006.01) B03B 11/00 (2006.01)
Patent
CA 1202285
ABSTRACT The invention relates to a method for concentrating precious metals and heavy minerals in sand or gravel deposits and an apparatus for carrying out the method. The method comprises pre-classifying the raw material suspended as a slurry in water by means of screen means into two to six fractions. Each fraction as a slurry in water is provided with a flow velocity of about 0.25 to about 0.50 m/sec. over a length of about 3 m. The flow is retarded and stopped to provide a plurality of volumes separated from each other in the direction of flow in the lower range of the overall height of the fluidized bid. Each flowing volume is treated during the retarded flow condition in its lower range of height be means of thrust and suction shocks acting on the flowing volume from below. The apparatus of the invention provides in a raw material feed station a vibrating feeder trough which is sidewardly open at its discharge end for the conveying and disintegrating of agglomerated bulk material. The sidewalls of the trough have inwardly bent upper edges so to partially extend over the conveying bottom. Nozzles for pressurized air or water jets are provided at the lower side of the said bent upper edges. The feeder trough has associated behind it a forescreen for separating the deads and a collecting tank beneath said forescreen for collecting the produced slurry.
430754
Ridout & Maybee Llp
Schmid Gustav
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