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Powder Mixer Power consumption

Specific (volumetric) power consumption for main types of powder mixers

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Section summary
1. Definition
2. Specific energy input for common powder mixers


1. Definition

Depending on the type of mixing principles involved, their size, speed and agitator design, mixers will be more or less energy intensive. Free fall mixers which are using diffusivity as main mixing mechanism will typically have the smaller energy consumption, convective mixers will be higher while the most energy will be consumed by shear mixers.

The table below is the typical specific power consumptions for the usual types of powder mixers found in the industry.

2. Specific energy inputs for common mixers


Mixer Specific energy input kW/m3
Rotating mixers (diffusive)
Drum blenders, bi-cone, V-blender, bin blenders
<1
Convective mixers
Ribbon blenders
1-5
Convective mixers
Paddle mixers
Vertically agitated mixers (Amixon type)
5-10
Shear mixers
Ploughshare mixers, mixers with deagglomerators
10-20

Source
Perry, 8th edition, page 21-41, McGraw-Hill