Abstract: There are disadvantages of complex reagent system,and the pulp need to be warmed in Iron Plant of Sijiaying,Hebei Iron Steel Group Mining Co.,Ltd.,for using NaOH,starch,lime,GK-68 as pH regulator,depressor,activator,collector respectively in anionic reverse flotation technology to deal with the mixed concentrate of both low and high intensity magnetic separation.Therefore,GE-609,a cationic collector,developed by Wuhan University of Technology is chosen from HYS-2,another cationic collector,developed by Central South University,for cationic reverse flotation test on mixed magnetic concentrate from Sijiaying Iron Plant.The comparison test on the cationic reverse flotation was carried out by simulating the on-site process and reagent system.The results show that iron concentrate with iron grade of 65.37% and recovery of 84.10% was obtained by using GE-609 and only one reagent-starch with the original process at room temperature,while iron concentrate with iron grade of 65.55% and recovery of 79.44% was received by simulating anionic reverse flotation at 40 ℃.Obviously,the cationic reverse flotation with GE-609 can achieve the goal of flotation in room temperature and simplifying the reagent system,and greatly improve the iron recovery.

Key words: Mixed concentrate from magnetic separation, Cationic reverse flotation, Cationic collector GE-609, Flotation in room temperature