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Comment Solids Handling

Particle-size reduction

By Chemical Engineering |

For most solids-processing operations in the chemical process industries (CPI), particle-size reduction and screening (classification) to achieve the desired particle-size are required, since processes rarely produce the desired size directly. When designing processes, selecting equipment and looking for ways to increase efficiency, CPI engineers must understand the size-reduction behavior of the solid materials in their processes. To do so, they need to evaluate the following set of key properties: • Particle-size distribution in the feed • Particle shape • Bulk density • Flowability, cohesiveness and adhesiveness • Corrosivity and composition • Moisture content • Hardness, brittleness and friability • Moisture content • Fibrous morphology • Abrasiveness • Stickiness • Elasticity, plasticity and ductility • Dust explosion characteristics • Temperature sensitivity (degradation, stickiness and phase change) • Toxicity • Oil and fat content • Reactivity or release of gases • Shock sensitivity or explosiveness Size-reduction mechanisms To fracture particles, communition equipment must impart sufficient stress to the material so that it fractures…
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