不同颗粒尺寸辉钼矿的氧化焙烧动力学

通过差热?热重实验和非等温分析法研究辉钼精矿的氧化焙烧动力学.结果表明:高温焙烧有利于辉钼矿的氧化,其初始氧化温度为450℃,500℃以上时迅速氧化.氧化过程符合未反应收缩核模型.氧化初期受化学反应控制,其表观活化能为123.180 kJ/mol;后期受内扩散控制,表观活化能为80.175 kJ/mol.整个氧化过程中...

Kinetics of oxidation roasting of molybdenite with different particle sizes

The kinetics of oxidation roasting of molybdenum concentrate was studied by differential thermal? gravimetric experiments and non-isothermal analysis methods. The results show that high temperature is beneficial for oxidation of molybdenum concentrate. The initial oxidation temperature of the molybdenum concentrate is 450 °C, and the rapid oxidation occurs above 500 °C. The oxidation process conforms to the unreacted shrinking nucleus model. The early stage of the oxidation is controlled by chemical reaction with the apparent activation energy of 123.180 kJ/mol, while the later stage is controlled by internal diffusion with the apparent activation energy of 80.175 kJ/mol. Moreover, the oxidation rate is closely related to particle size of the concentrate. The smaller the particle size is, the larger the oxidation rate is.