Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1997-03-18
1999-05-04
Lithgow, Thomas M.
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209166, 209 3, 209 12, 241 20, 241 2413, 241 2425, 241 241, B03B 700, B03B 900, B03D 102
Patent
active
059006048
ABSTRACT:
The present invention is a process for recovering valuable minerals using air lift concentration and progressive ore reduction. The ore is ground to a relatively coarse size, the ground ore is classified, and the underflow fraction floated to produce concentrate, middlings, and tailings fractions. The middlings fraction can be reground to liberate the valuable minerals and subjected to further air lift concentration. The classifier overflow fraction is passed through additional classifiers, the underflow fractions of which can be reground and refloated. The overflow fraction of the last classifier can be subjected to flotation to further enhance recovery.
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