Exploring the selective enrichment of vanadium–titanium magnetite concentrate through metallization reduction roasting under the action of additives

Abstract To achieve comprehensive recovery and utilization of iron and titanium resources in vanadium titanium magnetite concentrate, the vanadium titanium magnetite concentrate is subjected to metallization reduction roasting, studying the selective enrichment effects on iron- and titanium-containing phases in the reduction products under the influence of additives. Experimental results indicate that elevating reduction temperature, increasing additive concentration, and extending the reduction time promote the aggregation and growth of phases containing iron and titanium in the reduction products. Under the optimized roasting conditions of 1,250°C, addition of 4% of the additive, and a reduction time of 3 h, 92.91% of iron existed in metallic form, and 87.35% of titanium existed as anosovite. The average equivalent circle diameters for iron and titanium particles are 45.3 and 10.1 μm, respectively. By magnetic separation of the reduced products, the obtained magnetic separation concentrate contains 93.06% Fe, with an iron recovery rate of 96.15%. The magnetic separation tailings contain 39.22% TiO 2 , and the Ti enrichment rate of the tailings is 87.75%, indicating a good separation effect of iron and titanium.