Abstract: The volatilization characteristic of molybdenum trioxide ( MoO₃) is the main reason led to low yield of Mo, while the Mo0₃ stabilizing treated by CaCO₃ is an effective way to inhibit the volatilization of MoO₃. The low-temperature solid phase reaction between MoO₃ and CaCO₃ has been studied according to thermodynamics and kinetics law. Results show that MoO₃ and CaCO₃ may react at 450 ℃ to form stable CaMo0₄, the reaction is faster at 600 ~ 700℃ and there is no volatilization of MoO₃ therefore it is available to pre-treated MoO₃ at the temperature range. The CaCO₃ and MoO₃ solid phase reaction kinetics parameters at different heating speed are calculated by Coats-Redfern function, the activation energy (E) and pre-exponential factor (4) are respectively 167.45 kJ/mol and 1.22 x 10⁷ s ^-1 , and the reaction rate constant k - 1.22 x1O⁷ x exp( -20 140/T).

摘要： 三氧化钼(MoO₃)的挥发特性是导致Mo收得率较低的主要原因,采用CaCO₃对MoO₃进行稳定化处理是抑制MoO₃挥发的行之有效的方法。从热力学及动力学角度研究了CaCO₃和MoO₃低温固相反应。结果表明,二者在450℃就可反应生成稳定CaMO4,600～700℃反应速率较快且MoO₃未开始挥发,在此温度区间对MoO₃预处理效果较好。采用Coats-Redfern法计算了不同升温速率下CaC0₃和MoO₃固相反应动力学参数,活化能(E)和指前因子(A)分别为167.45 kJ/mol、1.22×10⁷s^-1,速率常OV数=1.22×10⁷× exp(-20 140/T)。

关键词: 碳酸钙, 三氧化钼, 抑制挥发, 热力学, 动力学