An investigation of phase transformation of titania slag using microwave heating

Abstract

The influences of microwave heating on the phase transformation of titania slag were systematically investigated. The thermal stability, surface chemical functional groups and microstructure of the titania slag before and after microwave heating, at a temperature of 950 °C for 60 min, were also analyzed using thermogravimetry and differential thermal analysis (TG-DSC), Fourier transform infrared spectroscopy (FT-IR) spectrum and scanning electron microscope (SEM), respectively. The TG-DSC analysis revealed that the phase transformation of the titania slag from anatase TiO₂ to rutile TiO₂ occurred between 750 and 1000 °C. The FT-IR rustles demonstrate that the banding form of Ti⁴⁺, Ti³⁺ and Ti²⁺ ions and the methyl groups on the surface of the titania slag has changed and a new chemical bond Ti–OH was formed. The results of SEM showed that a large number of regulation rutile TiO₂ crystals were found on the surface of the microwave-treated samples and the synthetic rutile has been synthesized successfully using microwave heating.

Keywords:

• microwave heating
• phase transformation
• structural performances
• titania slag
• rutile TiO₂

Acknowledgements

The authors acknowledge financial support from the National Scientific Foundation of China (No: 51404114, 51504110), Specialized Research Fund for the Doctoral Program of Higher Education (No: 20125314120014), and the Applied Foundation Fund of Yunnan Province of China (No: 2012FD015).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

National Scientific Foundation of China [grant number 51404114], [grant number 51504110]; Specialized Research Fund for the Doctoral Program of Higher Education [grant number 20125314120014]; Applied Foundation Fund of Yunnan Province of China [grant number 2012FD015].