Cut Point and Fractionation

Mass in size grade in UF Mass in size grade in feed 

Further consideration of hydrocyclone types is given in Section 8.3.9. 

An ideal classifier would split the particle size distribution fed to it iato two fractions, one of a size below the cut point the other greater than the cut point. In practice this 

If the fuU size distribution of a material is known then the grade efficiency based on particle number, length, area, mass or volume will be the same as any ctor required to convert between these quantities will cancel. Very often in practice, however, the fiill size distribution is not accurately known, there may well be a large amount of the distribution in the finest channel of the equipment used for particle size analysis. It is therefore advisable to work in terms of a mass distribution, and to provide a grade efficiency based on this. The total mass firaction of feed solids reporting to the underflow is termed the gross efficiency [Bradley, 1965], or total solids recovery. 

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