I am going to calculate activation energy for reduction of iron ore at different temperatures and time . I know reduction factor of iron ore at different temperatures and time.
You must first define the model of the reduction process (Shrinking Core Model is usual for iron ore). It depends on the rate-limiting step. After this you must evaluate the rate rate constant of each temperature of the equation versus temperature graph. Finally, you may apply the Arrhenius equation to evaluate the activation energy.