Equipment Selector


MICRON SIZE

EQUIPMENT 500 300 200 150 100 75 45 32 20 15 10 5 3 1
GRINDING AIR MICRONISERS













SPIRAL FLOW JET MILL







20 15 10 5 3 1
OPPOSED JET MILL


150 100 75 45 32 20 15 10 5 3
ROTARY IMPACT MILLS













IMPACT
MILL

300 200 150 100 75 45






CLASSIFIER MILL "CLM"



100 75 45 32 20 15 10 5 3
BALL
MILLS














GRATE DISCHARGE MILL
300 200 150 100 75 45 32 20 15 10


SCREEN DISCHARGE MILL 500 300 200 150 100








BATCH
MILL


200 150 100 75 45 32 20 15 10


CLASSIFYING CLASSIFIERS















AEROSPLIT CLASSIFIER


150 100 75 45 32 20 15 10 5

AEROSPLIT 100
CLASSIFIER





75 45 32 20 15 10 5 3 1
UNIT AIR SEPARATOR
300 200 150 100 75 45 32 20 15 10


MULTI WHEEL CLASSIFIER

200 150 100 75 45 32 20 15 10 5

 

Particle size comparison chart

There are a number of units and scales commonly used to measure particle size. These either refer to average particle diameter measured in units of length, typically microns, or refer to a smallest mesh size through which the particles will pass. The following table sets out conversions between a variety of systems:

 

US MESH TYLER SCREEN BSS MESH MICRONS INCHES MILLIMETRES EXAMPLE
18 16 16 1000 0.0394 1.000
20 20 18 841 0.0331 0.841
25 24 22 707 0.0280 0.707 beach sand
30 28 25 595 0.0232 0.595
35 32 30 500 0.0197 0.500
40 35 36 400 0.0165 0.400
45 48 44 354 0.0138 0.354
50 48 52 297 0.0117 0.297
60 60 60 250 0.0098 0.250 fine sand
70 65 72 210 0.0083 0.210
80 80 85 177 0.0070 0.177
100 100 100 149 0.0059 0.149
120 115 120 125 0.0049 0.125
140 150 - 105 0.0041 0.105
170 170 170 88 0.0035 0.088
200 200 200 74 0.0029 0.074 portland cement
230 250 240 63 0.0024 0.063
270 270 - 53 0.0021 0.053
325 325 350 44 0.0017 0.044
400 400 - 37 0.0015 0.037 plant pollen
550 - - 25 0.0009 0.0025
800 - - 15 0.0006 0.015
1200 - - 12 0.0005 0.012
1250 - - 10 0.0004 0.010
2500 - - 10 0.0004 0.010 large bacteria
4800 - - 2 0.0001 0.002 smoke particle

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