Give principle and working of “Fluid Energy mill”

Give principle and working of “Fluid Energy mill”
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1 Answer

Answer :

Principle:  It works on the principle of combined impact and attrition.

Working  

1. The material which is to be size reduced is fed in the grinding chamber from the bottom through the feed inlet.

2. The air or inert gas is introduced with a very high pressure through nozzles.

3. Due to high degree of turbulence, impact and attritional forces between the particles there is size reduction.

4. The air moves at a very high speed in elliptical part carrying with it fine particles that pass through the outlet in a classifier and are collected.

5. The large particles are carried by centrifugal force to the end whereby they are further exposed to the moving air.

6. The design of the mill provides for the internal classification of the particles whereby lighter, finer particles are discharged and heavier particles are retained due to effect of centrifugal force to be reduced to smaller size.

7.Feed should be of 20 to 200 # size &mill produces particles of 1 to30 micron range to get a very fine powder even up to 5µ,the material is pre-treated to reduce the particle size to the order of 100# and then passed through fluid energy mill

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