Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1991-09-09
1993-11-23
Valenza, Joseph E.
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209 3, 209208, 210297, 210519, B03B 530
Patent
active
052635902
ABSTRACT:
A method and apparatus for making a very precise separation between materials of different specific gravities. A heavy media separation apparatus for separating a heterogeneous mixture of solid particles having different specific gravities, comprising: a device for adding a suspension medium to the heterogeneous mixture, the suspension medium having suspended therein sufficiently fine particles so that the fluid has an average specific gravity intermediate that of the gravities of the particles to be separated; a device for introducing the heterogeneous mixture, to which the suspension medium has been added, half-way down a separatory vessel, in order to separate the heterogeneous mixture into a first fraction having a gravity lower than the gravity of the suspension medium and into a second fraction having a gravity higher than the gravity of the suspension medium, the first fraction floating and the second fraction sinking in the separatory vessel; a device for controlling and regulating vessel rise rates and vessel settling rates within the suspension medium in the separatory vessel so that they have approximately the same value and in such a manner that they exceed the minimal velocities required to maintain a uniform and stable suspension medium but do not exceed the particle rise rates and particle settling rates of the mixture of solid particles differing in specific gravity by one or two points to the third decimal place; and a device for gathering and evacuating float particles at the top and sink particles at the bottom of said suspension medium.
REFERENCES:
patent: 4260488 (1981-04-01), Condolias
patent: 4409098 (1983-10-01), Burke
patent: 4780201 (1988-10-01), Keeter et al.
patent: 4919807 (1990-04-01), Morton et al.
patent: 5082572 (1992-01-01), Schmidt
Publication "Ore Dressing Notes" by American Cyanamid Company, Aug. 1943.
Nguyen Tuan
Valenza Joseph E.
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