Abstract: The content of TFe and Al2O3 in an iron concentrate from suspension roasting-magnetic separation abroad was 64.50% and 5.95% respectively， main iron mineral is magnetite， little hematite. In order to solve the problem of high Al₂O₃ content in the concentrate， a new type of anionic collector DTL-1 was developed. Aluminium remove experiment was conducted on high-alumina iron concentrate after suspension roasting-magnetic separation via changes of flotation temperature， pH value and the dosage of collector DTL-1. Results indicated that， flotation temperature was 25 ℃， the pH was 8.0 and collector DTL-1 dosage was 50 g/t， through one roughing three cleaning one scavenging closed circuit flotation process， flotation concentrate with TFe grade of 66.40%， TFe recovery of 87.81%， Al₂O₃ grade of 4.90% was obtained. There is fine-grained alumina minerals wrapped in relatively coarse magnetite particles of flotation iron concentrate products. On the premise of ensuring the recovery of iron， some aluminum-containing iron oxides enter into the iron concentrate， resulting in the high content of aluminum in the iron concentrate.

Key words: High alumina iron ore, Dealumination collector, Flotation performance