Phase transformation of titanium concentrate in the oxidation process

The existence form and transformation pattern of phases in Panzhihua titanium concentrate during the oxidation process were studied by thermogravimetry,constant temperature tests,X-ray diffraction analysis and microstructure observations.The results show that the titanium concentrate is not oxidized by oxygen below 500℃.Fe₂Ti₃O₉ and TiO₂ phases start to form when the temperature is 600℃ and the diffraction peak intensities of Fe₂Ti₃O₉,TiO₂ and original phase Fe₂O₃ strengthen with the experimental temperature rising.When the temperature rises at 900℃,Fe₂Ti₃O₉ is substituted by Fe₂TiO₅ and the diffraction peak intensities of TiO₂ and Fe₂O₃ gradually weaken with the experimental temperature rising.Four chemical reactions concomitant with sintering effect occur in the oxidation process;they accelerate the formation of porosities and make the surface of oxidation products rough and loose.