Mixing Volume

Section summary
Volume range of common mixers
Min and Max volume of common mixers

Powder Mixing
Types of mixers
Mixing mechanisms
Mixing time
Mixing speed
Mixing volume
Mixing power
Mixer loading
Discharge time
Froude Number
Coefficient of Variation
Homogeneity
Tracer
Segregation / demixing
Tip speed
Sampling
ATEX speed
Mixer Bearing seals
Mixer discharge valve

Mixing Volume

Solids blenders can be ordered from manufacturers with quite a large range of sizes, from few liters to few or dozens of cubic meters. Solids blending is a volumetric process thus a volume should be specified when ordering a mixer, not a weight as the weight will vary with the bulk density of the solids. The table below shows the typical sizes of mixers that can be found on market.

Table 1 : Common solids mixers size range

Mixer Usual Sizes
Drum / Bin blenders
10 l in labs - 200 l industrial for drums
200 l - 2000 l for bins
Ribbon blenders 150 l - 5000 l
Bigger mixers are possible / special executions
Paddle mixers
100 l - 2000 l
Up to 5000 l for some manufacturers
Solids type 100 l - 5000 l
Bigger mixers are possible / special executions

Minimum and Maximum mixing volume

The table below is presenting mixing time that can be expected from the most common types used in the industry. These are indicative values to have a rough idea when assessing a design or troubleshooting an existing system.

Table 2 : Typical Min and Max mixing volume

Mixer Min mixing volume Max mixing volume
Drum / Bin blenders
Diffusive mixers
- 50-60%
Ribbon blenders 30% 70-80%
Up to 90% may be possible
Paddle mixers 30-40% 70-80%
Ploughshare mixers
Shear mixers
30-40% 70-80%



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