Results of investigation of the effect of wetting liquid droplet size on the growth of agglomerates during wet drum granulation of dolomite flour of selected grain-size composition which guaranteed geometrical similarity were discussed. The process of granulation was carried out batch-wise in a drum granulator 0.5 m in diameter and 0.4 m long at rotational speed 0.33 s(-1) and constant volumetric drum filling degree phi = 0.1. On the bed tumbling in the drum, the wetting liquid (distilled water) was supplied at a constant flow rate Q(w) = 12 x 10(-3) m(3)/h. The size of wetting droplets was changed using various air flow rates through pneumatic spray nozzles in the range Q(a) = 1.0 to 3.0 m(3)/h and applying a sprinkler which supplied (drop-wise) the liquid uniformly along the entire drum length. In the whole experimental cycle, constant mean saturation degree of the feed equal to S = 0.293 was used. Relationships determining the effect of wetting droplet size and particle size distribution of the raw material on the rate of agglomerate growth during drum granulation were developed.