The volatilization characteristic of molybdenum trioxide ( MoO

3

) is the main reason led to low yield of Mo

while the Mo0

3

stabilizing treated by CaCO

3

is an effective way to inhibit the volatilization of MoO

3

. The low-temperature solid phase reaction between MoO

3

and CaCO

3

has been studied according to thermodynamics and kinetics law. Results show that MoO

3

and CaCO

3

may react at 450 ℃ to form stable CaMo0

4

the reaction is faster at 600 ~ 700℃ and there is no volatilization of MoO

3

therefore it is available to pre-treated MoO

3

at the temperature range. The CaCO

3

and MoO

3

solid phase react

ion 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 10

7

s

-

1

and the reaction rate constant k - 1.22 x1O

7

x exp( -20 140/T).