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Pilot-plant tests have shown that the air-sparged hydrocyclone system has a specific capacity about 50-100 times higher than that of a traditional flotation cell for the recovery of phosphate from Florida ores. For fatty acid flotation, single-stage air-sparged hydrocyclone flotation produced a recovery of 75-77% in a rougher concentrate containing 24% P2O5. In reverse flotation with amine, the system gave a phosphate recovery of 98% in a cleaner concentrate containing 31% P2O5. Discussion is presented of the effects of process variables in terms of separation efficiency. A 6-inch air-sparged hydrocyclone system was fabricated and tested in a Florida processing plant for reverse flotation in the amine flotation circuit. A single-stage phosphate recovery of 91% was achieved with a concentrate grade of 30% P2O5. Porous tube plugging occurred in plant tests, however, probably due to the poor quality of the plant water., Pilot-plant tests have shown that the air-sparged hydrocyclone system has a specific capacity about 50-100 times higher than that of a traditional flotation cell for the recovery of phosphate from Florida ores. For fatty acid flotation, single-stage air-sparged hydrocyclone flotation produced a recovery of 75-77% in a rougher concentrate containing 24% P2O5. In reverse flotation with amine, the system gave a phosphate recovery of 98% in a cleaner concentrate containing 31% P2O5. Discussion is presented of the effects of process variables in terms of separation efficiency. A 6-inch air-sparged hydrocyclone system was fabricated and tested in a Florida processing plant for reverse flotation in the amine flotation circuit. A single-stage phosphate recovery of 91% was achieved with a concentrate grade of 30% P2O5. Porous tube plugging occurred in plant tests, however, probably due to the poor quality of the plant water.

Bench-scale flotation experiments have been conducted to study the effect of nonionic polyethylene oxide (PEO) polymer surfactants on the flotation of Florida phosphate rock. It was found that PEOs with a molecular weight from 1 200-8 000 had a favourable effect on phosphate flotation, especially on coarse phosphate feed. At about the same collector level, phosphate recovery can be improved by 10-30% with PEO addition. The surface chemistry of phosphate flotation using the fatty acid/fuel oil/PEO system has also been studied. The increase in phosphate recovery with PEO addition can be attributed to improved dispersion of fatty acid, which leads to better froth stability and a more hydrophobic surface state. At the optimum reagent addition level (942 g/t fatty acid/fuel oil and 135 g/t PEO), phosphate recovery of 92% was achieved, with the concentrate grading 28% P2O5., Bench-scale flotation experiments have been conducted to study the effect of nonionic polyethylene oxide (PEO) polymer surfactants on the flotation of Florida phosphate rock. It was found that PEOs with a molecular weight from 1 200-8 000 had a favourable effect on phosphate flotation, especially on coarse phosphate feed. At about the same collector level, phosphate recovery can be improved by 10-30% with PEO addition. The surface chemistry of phosphate flotation using the fatty acid/fuel oil/PEO system has also been studied. The increase in phosphate recovery with PEO addition can be attributed to improved dispersion of fatty acid, which leads to better froth stability and a more hydrophobic surface state. At the optimum reagent addition level (942 g/t fatty acid/fuel oil and 135 g/t PEO), phosphate recovery of 92% was achieved, with the concentrate grading 28% P2O5.

Separation results of batch flotation on an artificial mixture of pure minerals (25.87% P2O5 and 6.25% MgO) have indicated that it is possible to recover a concentrate containing 37.1% P2O5 and 0.6% MgO with 95% P2O5 recovery using 'Fe3+-hydrophylic ligand' as depressant., Separation results of batch flotation on an artificial mixture of pure minerals (25.87% P2O5 and 6.25% MgO) have indicated that it is possible to recover a concentrate containing 37.1% P2O5 and 0.6% MgO with 95% P2O5 recovery using 'Fe3+-hydrophylic ligand' as depressant.