TABLE OF CONTENTS There are three stages in the history of operation of separation systems. In the first stage, the main attention was given to increasing the efficiency of operation of individual apparatus. This resulted in the appearance of a large number of classifiers based on a single separation act. This direction is also being developed at present, but the limited efficiency of all the currently available classification systems has resulted in the appearance of multistage separation apparatus.
Experimental investigations carried out in recent decades show that the combining identical operations of separation, taking place in separate sections into a separation cascade, has made it possible to greatly increase the efficiency of fractionation of the powders. This combination realises the cascade system of separation and forms the second stage of improvement of the operation of classifiers. The separation cascade of order I consists of 'z' sections having a set number of links between them. The simplest variant of separation cascade of order I is realised when all the separating elements (sections) are identical and operate in the same regime. A regular cascade is obtained in this case. Complicated separation cascades of order I assume all possible relationships between the sections and not identical separating elements operating in different conditions. In this case, a non-regular cascade is realised. There is no mathematical description of operation of such a cascade in a general form, and this description must be found separately for each specific case. The experimental investigations of the simple variants...
