Abstract: Anionic collector DTL-1 was a new collector developed by Northeastern University for the reverse flotation dealumination test of suspension roasting magnetic separation iron concentrate. Flotation tests were carried out by collector DTL-1 on the aluminum mineral sample which was pure gibbsite treated by suspension roasting and the artificial mixed minerals of aluminum mineral sample and hematite mineral sample which was pure hematite and pure gibbsite treated by suspension roasting-magnetic to test the dealumination effect of collector DTL-1. The results showed that DTL-1 had a good effect on the collection of aluminum mineral at room temperature. In the artificial mixed minerals， the mass ratio of iron mineral sample to aluminum mineral sample was 15.67∶1， the grade of Al2O3 was about 5.95%. When the pH value was 8.0， the recovery rate of Al2O3 could be 91.21% in the single mineral flotation test， the grade of TFe could be 70.67%， the recovery rate of TFe could be 76.11%，the grade of Al2O3 could be 1.93% and the removal rate of aluminum could be 74.72% in the artificial mixed minerals flotation test. The adsorption mechanism were studied by Zeta potential measurements and Fourier transform infrared spectrum. The experimental results showed that there were electrostatic adsorption， hydrogen bond adsorption and chemisorption between collector DTL-1 and aluminum mineral sample.This showed that DTL-1 was a new type of room temperature anionic collector which could be used in the reverse flotation dealumination of suspension roasting magnetic separation iron concentrate.

Key words: gibbsite, anionic collector DTL-1, flotation, suspension roasting