In recent years an indubitable progress has been made in the development of separators for powder fractionating. The development of new types of cascade separators significantly improves the quality of final fractionation products. Consumed material concentration in all types of cascade separators does not exceed, as a rule, two kilograms of solid phase per a cubic meter of air flow. Therefore, to attain high productivities, considerable investments are needed, because for this purpose several apparatuses operating in parallel or apparatuses of large overall sizes are required. Special researches have shown the possibility of increasing the solid phase consumed concentration in a cascade apparatus up to 6.25 kg/m³ using a special attachment without altering the separation efficiency.

近年来，粉末分级分离机的开发取得了不容置疑的进展。新型级联分离器的开发显着提高了最终分馏产品的质量。所有类型的级联分离器中消耗的物质浓度通常不超过每立方米气流两公斤固相。因此，为了获得高生产率，需要相当大的投资，因为为此目的需要多个并行操作的设备或大总体尺寸的设备。专门研究表明，使用特殊附件可以将级联装置中的固相消耗浓度提高至6.25 kg/m ³，而不改变分离效率。