Solid mixing involves the following mechanisms:
Convective Mixing:
- Bulk movement of particles through mechanical means such as blenders, mixers, or tumblers.
- Large masses of material are moved from one location to another, promoting mixing.
Diffusive Mixing:
- Random movement of individual particles within the bulk.
- This is akin to the concept of diffusion but at a particulate level, leading to a more uniform distribution over time.
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Shear Mixing:
- Application of shear forces that cause layers of particles to slide over each other.
- This is often seen in high-shear mixers and can break agglomerates and improve homogeneity.
Tumbling Mixing:
- Using rotating drums or V-blenders where gravity causes the particles to tumble and mix as the container rotates.
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Solid Mixing Equipment
- Ribbon Blenders: Use helical ribbons to move solids within a stationary trough.
- Tumble Mixers: Rotate a container to mix particles through tumbling action.
- Fluidized Bed Mixers: Use gas or air to suspend and mix particles in a fluid-like state.
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