Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1981-06-02
1982-12-21
Yudkoff, Norman
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209 9, 209 12, B03D 114
Patent
active
043648240
ABSTRACT:
A reverse flotation process for removing alkaline earth metal carbonate impurities particularly dolomite and calcite as the cell overflow from a flotation feed reagentized with water, a carbonate collector, a phosphate depressant and a pH regulator to about 20-30% solids and a pH of about 5.5-6.0. The phosphate concentrate is collected as the cell underflow.
The carbonate collectors comprise stable salts of sulfonated linear fatty acids having a straight carbon chain of about eight to twenty-two carbon atoms and a direct sulfur to carbon bond. The sodium salt of sulfonated oleic acid is the preferred carbonate collector. Phosphate depressants include sodium tripolyphosphate.
The flotation feed particle size is preferably such that 90% by weight of the particles pass through a 42 Mesh (Tyler) screen. The effectiveness of the separation improves as the particle size of the flotation feed is decreased.
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Barnett H. J.
International Minerals & Chemical Corp.
Yudkoff Norman
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