Sixteen charges of cereal instant coffee powders were agglomerated in an industrial rotating disk granulator to granules above 2 mm in diam. under varying powder wetting time, tau (10-55 s), steam pressure, P (0.15-0.50 MPa), rotational disk speed, n (20-50/s), and drying-up temp., T (340-393 K). The plant productivity (230 kg/h) increased with increasing P (up to 280 kg/h), with decreasing tau and T and showed a max. on the n at 30/s. The mass fraction of the desired granules (about 75%) decreased with increasing t. n and T and with decreasing P The product humidity (34%) decreased with decreasing P and with increasing n.