Abstract: Magnetic pulley preconcentration, the second roasting of underburned ore and discarding, grinding, low intensity magnetic separation were used to treat the roasting ore of JISCO Jingtieshan specularite. In order to solve the problems of low grinding efficiency, low concentrate iron grade and low iron recovery of specularite in shaft furnace, the beneficiation tests were carried out. The results showed that the final iron concentrate with iron grade of 58.31% and recovery rate of 84.39% can be obtained after being crushed to 0~5 mm, dry preconcentration with powder ore, grinding-low intensity magnetic separation of dry concentrate and the second roasting-grinding-low intensity magnetic separation of dry middling. The yield of dry tailing is 7.56% and the iron grade is 7.75%, and the yield of middling requiring the second roasting is 18.03%. Compared with the actual site index, the iron grade of concentrate is about 3% higher and the iron recovery rate is about 2% higher with the new process. Therefore, the new process is an appropriate process for roasted ore on site, which realizes the effect of energy conservation and emission reduction, cost reduction and quality improvement.

Key words: Roasted ore, Powder ore, Dry magnetic separation, The second roasting