A novel process for recovery of iron, titanium, and vanadium from titanomagnetite concentrates: NaOH molten salt roasting and water leaching processes

► The conversion of titanium is 96.6% in the rich titanium-vanadium slag. ► MgTi2O5 and M3O5 (M = Ti, Mg, Fe) were converted to Na2TiO3 and NaMO2, respectively. ► Na2TiO3 is converted to undefined structure of H2TiO3. ► NaMO2 is converted to α-NaFeO2-type structure of HMO2. ► 87.3% of sodium, 42.3% of silicon, 43.2% of aluminum, 22.8% of manganese and 96.6% of vanadium were leached out.