关键词: 碳酸钙, 三氧化钼, 抑制挥发, 热力学, 动力学

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).