Classification, the fractionation or separation of particles by size，could be considered as merely inefficient clarification. The cut, or desired classification, is adjusted by altering the classifying decanter centrifuge’s efficiency. This is most easily done by altering the feed rate or bowl speed of classifying decanter centrifuge. However, adjustment of pond depth or differential may. in certain circumstances, be used.

In some classification applications. the required cut point is very sharp and the rheology of both separated phases is such that they remain quite fluid. In this type of application, the classifying decanter centrifuge’s pond used would be relatively deep, and separation would be akin to a liquid-liquid separation, using a hydraulic balance under some form of baffle.

Very occasionally there will be found a classification application where it is required to separate two distinctly different particles. such as in the refining of minerals. In these cases, the two different substances to be separated may have markedly different densities. For classifying decanter centrifuge, it is particularly acceptable and quite advantageous when the denser material comprises the larger-sized particles. However, if this is not so. one must consider a combination of density and particle size for the cut point of each of the two substances, in relation to Stokes’ law. One could visualize the situation of a large, low-density particle settling faster than a high-density, small particle. Thus for such a process to be feasible.

Each of the two solid constituents will have their own size distribution from which a cut point size can be chosen to give the desired purity of product and yield by classifying decanter centrifuge.