Segregation Demixing

A precision blender can mix bulk materials perfectly and precisely. When they leave the blender, the powders are evenly distributed. This state must be maintained.

Disperse systems consist of particles with different properties. Separation can occur during storage, transport or packaging. Separation is also referred to as segregation. It can significantly impair the quality of bulk materials.

Several factors influence separation:

• Particle size differences: Large and small particles separate during movement or pouring. Smaller particles often trickle down, while larger ones remain at the top.
• Differences in particle density: Light particles rise, heavy ones sink. This can lead to segregation even if the particles are the same size.
• Particle shape Round particles roll more easily than angular or fibrous ones: Different shapes lead to differences in movement and segregation.
• Slight moistening of the powder can bind the particles together. A liquid phase helps to stabilise the mixture.
• Agglomeration: Agglomeration binds the primary particles together. The mixture is fixed. Agglomerated goods also flow better.
• Process parameters: High drop heights during silo filling promote segregation.
• When emptying silos, different flow zones can lead to segregation.
• When powder mixtures are tipped out, cone-shaped piles can form. These slopes can lead to segregation.
• Vibrations occur during transport. They eliminate the internal friction of the bulk material. This can lead to segregation if the powders are not vacuum-packed.