Rapid synthesis of rutile TiO2 powders using microwave heating

In this present study, the thermal stability, crystal structures, and molecular structure of the sulfate titanium slag and the microwave treated samples were also analyzed using TG, XRD, and Raman spectrum, respectively. The reaction mechanism of oxidation reaction and the polymorphic transformation of the sulfate titanium slag were systematically investigated to identify the reaction processes. The effects of both temperature and time on the structure and chemical properties of the microwave treated samples were systematically investigated. The analysis results of the FeO–TiO2–TiO1.5 phase diagram showed that the oxidation reactions were occurred along the line of anosovite (Fe3Ti3O10)-low valent titanium-TiO2. The results of XRD showed that the anosovite phase of the sulfate titanium slag were transform to the rutile TiO2 phase under microwave heating at 950 °C for 60 min. The Raman spectrum results demonstrate that the vibration bands of low-valent titanium in the sulfate titanium slag were disappeared, and the vibrations bands of rutile TiO2 were formed after microwave heating processing. All the microwave treated samples have typical tetragonal structures that are well-crystallized.