【摘要】 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°C,500°C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123.180kJ/mol;后期受内扩散控制,表观活化能为80.175kJ/mol。整个氧化过程中辉钼矿的氧化速率和精矿的颗粒尺寸密切相关,颗粒尺寸越小,其氧化速率越大。更多还原

【Abstract】 The kinetics of oxidation roasting of molybdenum concentrate was studied by differential thermalgravimetric 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.更多还原