THERMOCHEMISTRY AND MECHANISM ON THE PROCESS OF PREP ARING POWDER OF Bi₂O₃ USING MELT-ATOMIZING-COMBUSTION METHOD

来源期刊：中国有色金属学报(英文版)1997年第3期

论文作者：Zhou Naijun Yin Zhimin Chen Shizhu

文章页码：114 - 118

Key words：bismuth trioxide； nanometer powder； atomizing combustion； thermochemistry

Abstract: Based on the experimental results concerning preparing nanometer powder of pure Bi₂O₃ using the melt atomizing combustion method, the thermochemistry and reaction mechanism of the process of melt atomizing combustion were studied. The results showed that, first, the specific heat capacity of gaseous Bi₂O₃ at temperature higher than 1 097 K is 105.324 J·mol^-1 ·K^-1 and its latent heat of evaporation at 2 163 K is 276.896 kJ·mol^-1 ; second, the cause for obtaining small powder size and high powder purity is that the processes of preparing powder could proceed upon a model as “atomization — vaporization — combustion — coacervation”, finally , reasonable process parameters of preparing powder of pure Bi₂O₃ should be melt temperature 900～1 000 ℃, mole ratio of excess oxygen 2～2.5, and cooling intensity of reactor 80～100 kW.