Suspensions containing solid particles with different sizes and different bulk liquids have been atomized by means of a twin-fluid atomizer. From drop size analysis in the spray it was found that the solid particle size is the main influence on the drop size distribution. Consequently, the atomization of a suspension can be divided into different regimes as follows: Atomization of suspensions with large particles, D-v50 > 50 mum. The drop size distribution in this range is bimodal, with two peaks (solid and liquid peaks). At lower values of (We(aero) x ALR) the liquid diameter peak is controlled by the solid particle size and at higher values of (We(aero) x ALR) it is controlled by the air stream velocity like the atomization of a pure liquid. Atomization of suspensions with small particles, D-v50 < 50 mum. The drop size distribution is monomodal. The atomization mechanisms of suspensions containing fine solid particles are very similar to the atomization of the pure suspension liquid.