Abstract: College of Resources and Civil Engineering, Northeastern University，Shenyang 110819，China The new amphoteric chelating collector DJW-2 was developed by Northeastern University to improve the effect of reverse flotation desilication in the magnetic separation concentrate. The tests on the dosage of DJW-2, optimum pH value of the pulp, the amount of calcium chloride and suitable flotation temperature were investigated to investigate the collecting performance on quartz, using pure mineral quartz as floating object. The result showed that when the pulp pH value was 9, dosage of DJW-2 was 750 mg/L, flotation temperature was between 38 and 18 ℃, the recovery rate could reach more than 90%.The further analysis on the zeta potential measurement and the infrared spectrum indicated that the dominated force that the DJW-2 on the surface of quartz were hydrogen boning adsorption and chemical adsorption. Therefore, the DJW-2 is a collector with high efficiency, low energy consumption and strong adaptability on reverse flotation desilication of concentrate of magnetic separation.

Key words: Chelating collector, Quartz, Collecting performance, Flotation mechanism