The process was carried out on an environmentally clean separator device of a new type-a classifier. The technological parameters of the process, the geometric parameters of the installation are determined and the influence of changes in these parameters on the course of the technological process is studied. It is established that in a pneumatic classifier with a multistage, cylindrical separation section having steps of increased diameter and equipped with tips adjustable by an angle from 00 to 900 in the horizontal plane, it is possible to obtain fractions of the required quantity and size. By doubling the diameter of the next stage compared to the previous one, it was possible to create a pressure drop and separate the polydisperse material by changing the particle velocity. The ecological advantage of the processed technology is noted, since during the separation of dispersed particles, part of the dust contained in the powdery mixture leaving the unit with the flow of air (gas) is retained in a dry holder, and the rest is in water (absorber)