A novel process for the recovery of iron, titanium, and vanadium from vanadium-bearing titanomagnetite: sodium modification-direct reduction coupled process

摘要

A sodium modification-direct reduction coupled process was proposed for the simultaneous extraction of V and Fe from vanadium-bearing titanomagnetite.The sodium oxidation of vanadium oxides to water-soluble sodium vanadate and the transformation of iron oxides to metallic iron were accomplished in a single-step high-temperature process.The increase in roasting temperature favors the reduction of iron oxides but disfavors the oxidation of vanadium oxides.The recoveries of vanadium,iron,and titanium reached 84.52％,89.37％,and 95.59％,respectively.Moreover,the acid decomposition efficiency of titanium slag reached 96.45％.Compared with traditional processes,the novel process provides several advantages,including a shorter flow,a lower energy consumption,and a higher utilization efficiency of vanadium-bearing titanomagnetite resources.