Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1990-05-24
1991-09-10
Silverman, Stanley S.
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209 12, 209 39, 209173, 106405, B03B 530, B03B 904, B03B 102
Patent
active
050471457
ABSTRACT:
A wet process for the beneficiation of a fly ash by-product has the following steps: a) forming a slurry mixture of a fly ash material and a liquid; b) gravitationally separating and collecting a first material fraction of the fly ash having a density less than the liquid by skimming off floating slurry material; c) separating a first magnetic fraction from the slurry by subjecting the slurry to a magnetic field of from about 300 gauss to about 10 kilogauss; d) separating the unburned carbon from the remaining slurry components by adding an effective amount of an oil having a carbon chain greater than octane, and a frothing agent whereby the oil coats the unburned carbon forming hydrophobic carbon materials and inducing air into the system for frothing the slurry mixture wherein the hydrophobic unburned carbon froths to the surface and is removed by skimming off the frothing layer; and e) collecting the remaining fraction of silicate spheres and silicates.
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Board of Control of Michigan Technological University
Lithgow Thomas M.
Silverman Stanley S.
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