Abstract: With the increase of mining depth for Hongge iron mine in Panxi region,the content of gabbro and pyroxenite is gradually decreased while the content of olivine-pyroxenite is gradually increased,which resulted in the original mineral separation technology unable to obtain qualified iron concentrate products.In order to provide basis for the rational separation processing technology of the refractory olivine-pyroxenite type vanadium titanium magnetite ore from Hongge,the separation experimental study was conducted based on the analysis of the ore mineralogy properties.Results indicated that Fe grade and TiO₂ grade of the raw ore is 14.75% and 5.59%,respectively.And,the Fe in titanomagnetite accounts for 55.05% of total Fe.By wet preconcentration of magnetic separation on the raw ore(crushed to -3 mm),preconcentrate with iron grade of 21.05% and recovery of 83.61% was obtained,with 41.12% barren rock of 5.91% Fe.Preconcentrate via grinding-low intensity magnetic separation-re-grinding by stirring mill-low intensity magnetic rough concentration-magnetic flocculation gravity concentrator cleaning.Concentrate with 57.25% Fe,9.55% TiO₂,and iron recovery of 46.54% was obtained.The results provide an effective technical way for the effective development and utilization of such low grade olivine-pyroxenite type vanadium titanium magnetite ore.

Key words: Olivine-pyroxenite type vanadium-titanium magnetic ore, Wet magnetic preconcentration, Stage grinding-stage magnetic separation, Stirring mill, Magnetic flocculation gravity concentrator