Application
Powder Blending in Chemical Production
Answer in brief
Chemical blends mix components that differ widely in density and particle size, which is exactly the recipe for segregation.
The mixer usually achieves the specification; the transfer afterwards is where it is lost.
- Match particle sizes where the formulation allows it.
- Prove uniformity by sampling, not by mixing time.
- Control dust at charging, where exposure is highest.
Reviewed October 21, 2026 · Updated October 21, 2026
The problem
Components with different densities separate during discharge and transport, and a blend sampled at the mixer outlet can look very different in the drum.
Desired outcome
A blend that meets the uniformity requirement at the point of use, proven by a sampling method that reflects how the product is consumed.
Process approach
Convective mixers handle cohesive and varied blends, while tumble designs suit free-flowing materials with similar particle sizes.
Charging is the exposure point, so enclosed bag or bulk bag stations with extraction belong to the blending system rather than to the warehouse.
Discharge into drums or bags is designed to avoid free fall, which is where the blend separates.
- Particle size matching where the formulation allows.
- Enclosed charging with extraction.
- Discharge arrangement that limits segregation.
Selection factors
- Homogeneity requirement and the sampling method.
- Density and particle size spread across components.
- Exposure limits of the components.
- Cleaning method between products.
- Dust explosion characteristics of the blend.
Common failure modes
- Blend separating during discharge into drums
- Exposure concentrated at manual charging
- Mixing time extended instead of addressing particle size
- Cleaning between products judged by appearance
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