From the mid-1970s onwards the emphasis of cement industry has been on the development of various precalcining processes. The key of precalcining process is precalciner. E. Kolyfetis developed a mathematical model which treats the spouting precalciner as a typical entrained flow reactor to describe the steady -state behaviour of SLC precalciners. In the present work

the decomposition of CaCO3 particles in the spouting precalciner was investigated by numerical modelling. The k-ε gas turbulence model as well as the no-"slip" model of particle motion was applied to the decomposition of CaCO3 in isothermal two-phase flow. The numerical results were found to be in qualitative agreement with E. Kolyfetiss results. This method was also used to study the effect of various physico-chemical and operating parameters on precalciner performance.