Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1976-11-30
1978-09-05
Lutter, Frank W.
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209 11, 209172, 209173, 252 60, B03B 544
Patent
active
041117980
ABSTRACT:
A method and apparatus for separating objects having a density greater than a selected density value from objects having a density less than said selected density value. The method typically comprises: (a) providing a separation vessel having an upper and lower portion, said vessel containing a liquid having a density exceeding said selected density value; (b) reducing the apparent density of the liquid to said selected density value by introducing solid, bubble-like bodies having a density less than that of the liquid into the lower portion of the vessel and permitting them to rise therethrough; (c) introducing the objects to be separated into the separation vessel and permitting the objects having a density greater than the apparent density of the liquid to sink to the lower portion of the vessel, while the objects having a density less than said selected density value float in the upper portion of the vessel; and (d) separately removing the higher density objects in the lower portion and the lower density objects in the upper portion from the separation vessel. The apparatus typically comprises: (a) a vessel containing a liquid having a density such that at least part of said objects having a density exceeding said selected density value will float therein; (b) means to place said objects into said vessel; (c) means to reduce the effective density of at least a portion of said liquid to said selected density value, whereby said objects having a density exceeding said selected density value sink into said liquid and said objects having a density less than said selected density value remain afloat, said means to adjust the effective density comprising solid, bubble-like bodies having a density less than said selected density value and means for introducing said bodies into said liquid; and (d) means for separately removing said objects having a density exceeding said selected density value and said objects having a density less than said selected density value from said vessel.
REFERENCES:
patent: 2075593 (1937-03-01), Sveinsson
patent: 2590756 (1952-03-01), Colin et al.
patent: 2620069 (1952-12-01), Wendt
patent: 2774734 (1956-12-01), Rodis et al.
patent: 2879889 (1959-03-01), Rakowsky
patent: 3702656 (1972-11-01), Gutterman et al.
patent: 3822015 (1974-07-01), Hsieh
Duffy James B.
Peterson Palmer L.
Tokarz Richard D.
Battelle Development Corporation
Bissell Barry S.
Hill Ralph J.
Lutter Frank W.
Shaweker Kenneth E.
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