Classifying – separating – and assorting solids – Plural – diverse separating operations – Sifting and stratifying
Patent
1990-10-09
1992-04-28
Hajec, Donald T.
Classifying, separating, and assorting solids
Plural, diverse separating operations
Sifting and stratifying
209270, 209296, 209458, 241 74, 241 793, B03B 700
Patent
active
051085844
ABSTRACT:
A machine is employed for recovering heavy metals, such as gold, from placer ore. The machine employs a cylindrical, annular outer drum mounted for rotation at an inclination to the horizontal and including at least one spiral vane extending the length of its inner surface. A cylindrical, annular inner barrel is mounted within the drum and has an upper fragmentation section, an intermediate trommel section, and a lower discharge section. A spray of water is directed into the inner barrel and a water spray bar is located in the annulus between the inner barrel and the outer drum. A sluice box is located to receive an input discharge from the upper end of the outer drum. The ore is separated into large tailings that are discharged from the lower end of the inner barrel and fine, light tailings from the outer drum. The heaviest and finest portions of the material are carried by a spiral on the inner surface of the outer drum and discharged into the upper end of the sluice box from the upper end of the outer drum. The sluice box includes a plurality of landings upon which heavy materials, such as gold, collect. The outer drum is subjected to vibration to aid in the recovery process.
REFERENCES:
patent: 652900 (1900-07-01), Postlethwaite
patent: 1861578 (1932-06-01), Munro
patent: 2057338 (1936-10-01), Malke
patent: 3815737 (1974-06-01), Katter
patent: 4178238 (1979-12-01), Harris
patent: 4440637 (1984-04-01), Smit et al.
patent: 4525270 (1985-06-01), McCann
Hajec Donald T.
Kaufman Joseph A.
Thomas Charles H.
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