Effect of BaSO ₄ on Phase Transformation and Microstructure of CaOFe ₂ O ₃ TiO ₂ System During Sintering

The Fe 2 O 3 CaOTiO 2 BaSO 4 system is established through miniature sintering experiments to reveal the mechanism of BaSO 4 and vanadium‐titanium magnetite (VTM) with the help of X‐ray diffraction, scanning electron microscope and energy dispersive spectroscopy, and thermogravimetry. The results show that in the absence of BaSO 4 , the phase of the sinter consists of CaFe 2 O 4 , TiO 2 , Fe 2 O 3 , CaTiO 3 , and CaFe 2 O 5 . When the content of BaSO 4 is 1% and 2%, CaTiO 3 decreases and the number of needle‐like CF increases. Some Ba 2+ solidly dissolve into CF and CaTiO 3 to form trace BaFe 12 O 19 and BaTi 2 O 5 . When the content of BaSO 4 increases to 4%, the CaSO 4 phase appears, the formation of C 2 F is accelerated, and the content of CF and CaTiO 3 continues to decline. The needle‐like calcium ferrate gradually transforms into columnar and lamellar. As the BaSO 4 content continues to increase to 6% and 8%, although the trend of each phase is similar to that at 4%, it is almost entirely composed of columnar calcium ferrite, barium ferrite, and incomplete tetragonal and rhombic Fe 2 O 3 . The results of the study provide a theoretical basis for the utilization of VTM and barium‐containing iron ores in practical production.