Classifying – separating – and assorting solids – Fluid suspension – Liquid
Reexamination Certificate
2001-08-09
2004-02-03
Lithgow, Thomas M. (Department: 1724)
Classifying, separating, and assorting solids
Fluid suspension
Liquid
Reexamination Certificate
active
06685027
ABSTRACT:
The present invention relates to a phosphate ore flotation process. The invention modifies the commonly used “double float” process. In the double float process, the first float is to reject most of the silica by floating the phosphate, producing a rougher phosphate concentrate, and the second float is to remove most of the remaining silica in the rougher concentrate by floating the silica. To prevent the phosphate from floating with the silica, the rougher concentrate is scrubbed with dilute acid prior to the second float. This process is referred to as “de-oiling”. The present invention includes a method to float inadequately de-oiled phosphate particles prior to silica flotation, using a cationic collector.
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Arr-Maz Products, LP
LaPointe Dennis G.
Lithgow Thomas M.
Mason Law, P.A.
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