Abstract: In order to improve the production index of magnetite working area in Gongchangling Con⁃ centrator，in view of the problems such as the fluctuation of concentrate index，the high grade of tailings and the increase of reagent consumption caused by the increase of ore processing capacity，the process opti⁃ mization and technical transformation were carried out by using the new process of two-stage grinding， one-stage magnetic separation and tailings discarding，gravity separation，coarse-fine classification and fine-grained magnetic separation. The results showed that the qualified iron concentrate with yield of 27.55%，iron grade of 67.09% and iron recovery of 73.91% was obtained after process optimization，and the iron grade of comprehensive tailings was 9.01%. The new process can efficiently separate Gongchan⁃ gling magnetite with excellent product indexes，simple process and remarkable economic benefits.

Key words: magnetite, technological transformation, gravity-magnetic separation