Classifying – separating – and assorting solids – Electrostatic – Stratifying
Patent
1992-04-23
1994-12-27
Olszewski, Robert P.
Classifying, separating, and assorting solids
Electrostatic
Stratifying
209420, B03G 700
Patent
active
053757211
ABSTRACT:
A dry placer mining machine and a belt assembly for use therewith. The machine concentrates metallic constituents from a gravel mix by fluidizing the mix with air which passes upwardly through the belt assembly, and moving the fluidized mix over the belt and applying an electrostatic charge thereto. The belt assembly is made up of a composite fabric belt member and a plurality of riffle members which extend transversely across this. The composite fabric belt member is constructed of non-conductive materials so as to minimize dissipation of the electrostatic charge, and this is made up of a finely woven cloth top layer, a reticulated foam middle layer, and a coarse mesh lower layer. The riffle members, in turn, are provided with insulation for preventing the electrostatic charge from being conducted away from the fabric belt member. The belt assembly is driven over the open upper end of a plenum chamber, and air pressure is supplied to this through a blower and ducting. The internal surfaces of these components are coated with an insulating material which enhances the build-up of electrostatic charge on the airflow.
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Noland Kenneth
Olszewski Robert P.
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