Recovery of fine-grain and low-grade collophane from gravity tailings of Yichang phosphate by flotation

In order to effectively recover the low grade fine grain collophane produced by the heavy medium separation of Yichang phosphate rock, and improve the utilization of resources, the multi-element analysis and and particle size analysis had been carried out. The analysis show that the fine particle under 0.045mm fraction content is above 94%, the grade of P2O5 is nearly 15.62%, MgO content of 4.30%, SiO2 content of 24.46%, which belongs to the micro fine silicon low grade cellophane. Thus to improve the ore grade, low pulp concentration direct-reverse flotation should be implemented. The test results show that the final dressing index with P2O5 grade of 29.09%, recovery of 78.01%, MgO content of 0.82% has gained by flow of one coarse one sweep two fine direct flotation joint one coarse one sweep reverse flotation under pulp concentration of 24%. It can effectively recover the low grade fine grain collophane produced by the heavy medium separation of Yichang phosphate rock and improve the utilization of resources.