铅锑复杂硫化矿中锑的挥发动力学

Volatilization Kinetics of Antimony for Pb-Sb Complex Sulfide Ores

通过测定锑的挥发率 ,研究了铅锑复杂硫化矿在空气—水蒸气混合气氛中锑的挥发动力学。扫描电子显微镜 (SEM )结果显示 ,铅锑复杂硫化矿颗粒存在着一个明显的反应界面。实验数据与界面化学反应和固体产物层内扩散共同控制数学模型相吻合。反应表观活化能和内扩散表观活化能分别为 117 0 8kJ/mol和 5 6 73kJ/mol。当温度升高、床层厚度增加及水蒸气流量增加时 ,锑的挥发率相应在增加。

The volatilization kinetics of antimomy with reaction between Pb-Sb complex sulfide ores and air-steam mixture was investigated by measuring volatilization ratio of antimony. The results of scanning electron microscope(SEM) showed that there was a clear reaction interface in the Pb-Sb complex sulfide ores particle . The experimental data were fitted to a mathematical model of joint controlled by the chemical reaction at the interface and diffusion of steam through the product layer. The apparent energy for the chemical reaction and diffusion were calculated to be 117.08 kJ/mol and 56.73kJ/mol respectively. The experimental results showed that the volatilization ratio increases with the increasing of the reaction temperature, steam flow rate and decreasing of bed thickness.