Single float step phosphate ore beneficiation

Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate... – Selective differentiation

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209166, B03D 102

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active

046005056

ABSTRACT:
A flotation process is taught for beneficiating phosphate ores containing, as impurities, silica and alkaline earth metal carbonates, particularly dolomite. Using a single flotation stage, the phosphate values are recovered in the overflow and quite unexpectedly both the siliceous and the carbonate gangue minerals are simultaneously removed in the underflow. Prior to flotation, surfaces of the minerals in the phosphate ore are selectively sulfidized with an insoluble copper-containing metal sulfide, permitting use of sulfide mineral collecting reagents such as alkyl xanthates in the flotation step to achieve a high degree of selectivity.

REFERENCES:
patent: 3309029 (1967-03-01), Frame
patent: 4362615 (1982-12-01), Llewellyn
patent: 4514290 (1985-04-01), Swiatkowski et al.

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