Flaky particles

Smooth jaws produce more numerous flaky pieces than corrugated jaws. Curved jaws produce less fines but more numerous flaky particles. Crusher speed has little effect. The presence of material too small to be crushed has a deleterious effect on the shape of products. Secondary crushers with a small reduction ratio can improve the shape of primaiy crushed material, but secondaiy crushers are not inherently different from primaiy crushers. Slotted screens can remove flaky particles from the product. Impact crushers produce fewer flaky particles than any other type. 

Electron Beam Rotating Disk Atomization (EBRD) <700 Narrow size distribution Refractory, reactive metals and alloys such asTi >103 -5.5 -0.5 Relatively high EE Coarse (flaky) particles, Relatively low capacity throughput... 

The fines content is arbitrarily defined as <10 mm material, instead of <6 mm as with coal. This conservative definition is more inclusive of flaky particles in d-RDF. A low fines content is desired for increased bulk density, improved material flow, and reduced dusting. However, as with coal, some fines are necessary to achieve a mix of suspension and on-the-grate combustion. Table II lists an average fines content somewhat lower than the 20 - 40 wt% range typical of stoker coal. Note that these measurements were taken on the as-produced pellets, and any abuse during transport, storage, and feeding will increase the fines in the fuel as fed to the boiler. However, the pellet mill output can be screened, and the screen underflow returned to the mill, as is done with animal feeds to reduce fines. 

The main factors that affect the particle passage through sieve aperture are the method of sieve shaking, the ratio of open area of sieve to total area, particle size distribution, the number of particles on the sieve (sieve loading), and the dimension and shape of the particle. Friability and cohesiveness of solid particles can also affect the sieving operation. Difficulty can also arise with high aspect ratio particles (i.e., needle-shaped or flaky particles). 

As flaky particles are prone to breakage when loaded, a low flakiness index is sometimes specified. 

Thin flaky particles mica, graphite, aluminium 0.01-0.03 1.6-1.7 0.22... 

Personal experience of rigid particles confirms that moderately irregular particles like milled silica or alumina have no measurable shape effect, and that only grossly irregular shapes do, such as the flaky particles of some clays and mica. These have been found to give an apparent volume response double or even treble the physical volume, i.e. the diameter calibration factor could differ by up to 66% from the calibration factor derived from spherical latex particles. 

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