Abstract: In view of red mud with high content of iron, mud, micro-fine particles,taking the method of recovering hematite recovery with the hydrophobic aggregation-magnetic seed method and got the optimal parameters in the process, such as the magnetic flux density, pulping concentration, stirring time, the dosage of sodium silicate, the amount of magnetic seeds,the dosage of diesel oil and oleic acid.Then separating effects of the hydrophobic aggregation-magnetic seed method are compared with that of the conventional magnetic separation technology at each best condition.It is obtained that iron grade and recovery are increased by about 10% separately with the former method, comparing with the later.

Key words: Hydrophobic agglomerating, Magnetic seed, Red mud, Iron minerals