Flotation of Carbonate Minerals from Unaltered Phosphate Ores of the Phosphoria Formation.
Rule AR; Clark CW; Butler MO
NTIS: PB 233 495 :18 pages
A flotation process was developed by the Bureau of Mines for separation of carbonate and phosphate minerals, occurring in unaltered phosphate ores of the phosphoria formation. The process involves depression of phosphate minerals with fluosilicic acid and flotation of carbonate minerals with fatty acid emulsions. In individual laboratory tests, selective removal of carbonates was achieved with phosphate recoveries ranging from 60 to 80 pct p2o5. In continuous-circuit testing, sizing and separate treatment of coarse and fine fractions was necessary to achieve 65-pct p2o5 recovery. Concentrate grade ranged from 26 to 33 pct p2o5. The flotation tailings containing primarily carbonate and phosphate minerals are a potential fertilizer material. When reacted with h3po4, concentrated superphosphate containing approximately 40 pct available p2o5 was obtained.
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