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Phosphate rock as an important chemical raw minerals, mainly for the Preparation of phosphate fertilizer, in part for the Preparation of pure phosphorus, chemical raw materials, as well as animal feed. Phosphorus has a non-renewable and non-cycle characteristics, taking into account the importance of the phosphate rock on the development of agriculture, many countries have phosphate rock as a strategic resource. Beneficiation of the phosphate rock weathering bonanza through scrub off the mud throw away a lot of tailings P2O5 grade, fine particles, large amount of mud. With a good selection, easy selection of phosphate resources dwindling, poor sorting, fine, miscellaneous phosphate rock become a necessity, in order to make a useful minerals monomer dissociation, must grind the ore finely. Therefore, it is imperative to the development of fine-grained rock phosphate beneficiation technology. In this paper, the recovery of phosphorus in the the American of Florida fine grained phosphate rock tailings. XRD analysis showed that the tailings useful mineral hydroxyapatite content of about 26% gangue minerals are quartz, dolomite, hematite and aluminum silicate clay minerals, the tailings for high silicon - calcium type phosphate rock. The fine particle size of the tailings, which d50 to 5.867μm the d95 of as 13.377μm, the maximum particle size 39.234μm, re-election, magnetic cover method, optical sorting method is more difficult to deal with such a fine-grained tailings. This test first positive flotation removal of the rough concentrate silicate gangue minerals, then rough concentrate reverse flotation removal of carbonate gangue minerals to reduce MgO content in the concentrate. Obtained at pH 9.5, the amount of oxidized paraffin wax soap 10.3kg / T, waterglass amount 6kg / t, the temperature 38 ℃, the slurry concentration of 7%, the stirring speed of the flotation machine 2800r/min conditions positive flotation rougher phosphorus Coarse mine P2O5 grade of 10.86%, 80.55% recovery indicators. Open circuit flotation using a coarse two sweep SANJING processes, 3.5% pulp density, in flotation machine speed 2000r/min, temperature 38 ℃, the rougher scavenger pH 9.5, the selection of the pH value of 5.0; rougher oxidized paraffin soap amount of 15.5kg / t, sodium silicate dosage 6kg / t; swept away the amount of oxidized paraffin soap 3.1kg / t, the the two sweep oxidized paraffin the soap amount of 1.56kg / t; a fine oxidized paraffin soap dosage of 5.1kg / t, sodium silicate dosage 2kg / t; oxidized paraffin soap two fine amount of 2.55kg / t, sodium silicate dosage 1kg / t; the Sanjing oxidized paraffin the soap amount of 1.275kg / t, sodium silicate dosage 0.5kg / t; final concentrate P2O5 grade 18.94% and recovery rate of 16.43%. Study the mechanism of action in the flotation reagent and minerals: collector oxidized paraffin soap collector role of phosphate rock is oxidized paraffin soap collectors through its phosphate surface chemisorption of phosphorite collector main achieve. The analysis of the sodium silicate solution: the most effective component of quartz from the inhibition is HSiO3-silicate micelles, sodium silicate silicate minerals disincentive slime also play a dispersion.
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