KJ Ceramics 31

Home | Program | Detailed Program

Detailed Program

Paper Number : SY-P05

Time Frame : 12:00~13:30

Presentation Date : 27, Thursday, 2014

Session Name : Synthesis, Raw Materials & Advanced powder processing

Session Chair 1# :

Session Chair 2# :

Fabrication of WO3 from UP-Cycled Ammonium ParaTungstate (APT)

Jun-Ki Chung

Gangneung-Wonju National University

The possibility of chemical precipitation method of up-cycled ammonium paratungstate (APT) has been studied, and compared with thermal decomposition method. WO3 particles were synthesized by chemical precipitation method using a 1:1.5 weight ratio of ammonium paratungstate hydrate (H42N10O42W12xH2O):(H2SO4). The fabricated products have been characterized by X-ray diffraction (XRD), X-ray Fluorescence Spectrometer (XRF) and scanning electron microscopy (SEM) equipped with energy dispersive spectrometry (EDS).
The formation of monoclinic crystal structure of WO3 at heating temperatures was confirmed by X-ray diffraction (XRD). Thermogravimetric analysis (TGA) of the sample allowed identification of the sequence of decomposition and reduction reactions occurring during heat treatment. At over 500°C, X-ray diffraction indicates only a major peak of WO3 (Fig. 1). TGA in air indicated a total weight loss of 10.12 % with the reactions completed by 660 °C. The particle size distribution and morphology of the synthesized WO3 powders were unaffected by the calcination. WO3 particle size of 0.67~1.12 ㎛ and apparent density of 6.9 g/cm3 were obtained by controlling suitable technological parameters.

Acknowledgements :

Back Home