The tumbling agglomeration involves both disintegration of
weaker bonds and re-agglomeration by abrasion transfer and coalescence
of larger units. Coalescence occurs at contact points
and additional growth of the agglomerate may proceed by further
coalescence, or by layering, or both. The particles to be agglomerated are larger; however, the particle-to-particle adhesion needs to be increased by the addition of binders, such as
water or other more viscous liquids, depending on the properties
of the particles being agglomerated and the required strength of the agglomerate structure (