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Comment PDF Solids Handling

Facts at your Fingertips: Agglomeration and Granulation

By Scott Jenkins |

Agglomeration and granulation are used to achieve a wide range of objectives in solids-handling processes, including to ensure a desired particle-size distribution, minimize segregation, and improve solids flow, as well as to control de-aeration and compaction behavior and attrition resistance and solid dissolution rates. This one-page refresher describes the two broad categories of agglomeration processes — agitation (wet agglomeration) and compression methods. Wet agglomeration Agitation-based processes include fluidized-bed, disc, drum and mixer granulators, as well as hybrid designs (Figure 1). A particulate feed is introduced to a process vessel and is agglomerated (batch or continuous) to form a granulated product. The feed typically consists of a mixture of active products, binders, diluents, flow aids, surfactants, wetting agents, lubricants, fillers and end-use aids (sintering aids, colors and taste modifiers). Agglomeration can be induced by a solvent or slurry atomized onto the bed of particles, or by the controlled sintering or partial melting of a binder component of the feed. Wetting of the initial feed promotes nucleation of fine powders, or a coating for particle sizes in excess of drop size. In the coalescence…
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