Classifying – separating – and assorting solids – Plural – diverse separating operations – Gaseous suspension and sifting
Patent
1994-06-01
1995-04-18
Bollinger, David H.
Classifying, separating, and assorting solids
Plural, diverse separating operations
Gaseous suspension and sifting
209 31, 209142, 209143, 241 792, 241204, 241 24, B07B 700
Patent
active
054070791
ABSTRACT:
A dry washer for separating small high density particles such as gold from a mixture of high and low density material. A rotatable impeller in a cylindrical chamber draws in air and mixed particles, such as sand, and fractures the larger particles. The mixture of air and particles passes to a helical conduit having a perforated partition spaced from the outer wall so that high density particles pass through the wall under centrifugal forces. The particles are passed from the helical conduit to an inclined upper trough including an air permeable floor and riffles or the like to retain the high density particles. Air flow from the helical conduit is directed to a lower trough below the trough. A damper at the end of the lower trough causes air to pass through the air permeable floor and blow away fine low density particles. Dust and air from the trough assembly is passed to an elongated cover to collect the fine, low density, particles.
REFERENCES:
patent: 7828 (1850-12-01), White et al.
patent: 3013663 (1961-12-01), Vane
patent: 3140254 (1964-07-01), Katzen
patent: 3861603 (1975-01-01), Lautzenheiser et al.
patent: 5106488 (1992-04-01), Jonasson
Bollinger David H.
Douglas Lisa A.
Duncan John R.
Gilliam Frank D.
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