Abstract: The iron grade of JISCO tailings from magnetic separation is about 21.50%. A large amount of tailings stockpilling in tailing dam not only occupied the lands and polluted the environment but also wasted iron resourses. In order to study the feasibility of the suspension magnetization roasting technology for the tailings utilization and relieve the pressure of shortage of raw material in JISCO， the pre-enrichment-suspension magnetization roasting-magnetic separation-reverse flotation expansion experiment research was conducted for the tailings. The test results showed that: ①The tailings are sorted by one-stage weak magnetic and two-stage strong magnetic pre-enrichment process to obtain a pre-enriched concentrate with iron grade of 26.01% and recovery rate of 82.71%. The main iron minerals in the pre-enriched concentrate are hemetite， magnetite and siderite. The major gangue minerals in the pre-enriched concentrate are quartz， dolomite and barite.②In the suitable process parameters condition of reduction temperature of 530 ℃， CO flow of 2.0 m3/h， N2 flow of 3.0 m3/h， treatment amount of 99 kg/h， the tests run stablely in 48 h and get the better technology indexes of average iron grade of 51.41% and average iron recovery rate of 72.39% after magnetic separation with magnetic tube. ③Iron concentrate could be obtained with iron grade of 58.67%， iron recovery rate of 57.82%， SiO2 content of 6.48%， and comprehensive tailing iron grade is of 12.00% in the whole process of pre-enrichment-suspension roasting-magnetic separation-reverse flotation， which provides technical basis for next stage recycling process of the tailings resources in JISCO.

Key words: Tailings in tailings dam, Strong magnetic pre-enrichment, Suspension magnetization roasting, Magnetic separation, Reverse flotation