  A model for the dynamical evolution of a granular binary mixture is analyzed.
This system is submitted to a tapping procedure, similarly to what is done in
real experiments. In the weak vibration limit, an effective dynamics for the
tapping process is derived, and the steady state probability distribution is
analytically found. The steady probability does not depend on the details of
the configuration, but only on the number of particles of each of the two
species. Depending on the values of their fugacities, the system can be either
almost full of small or big particles, i.e., segregation effects are present.
