Pneumatic methods of superfine powders processing

The intensity of size reduction in complex pneumatic units is determined by the working pressure, chamber and nozzle process parameters, intensity of circulating motion, physical and mechanical properties of feed powders and size of produced particles. Our research shows that the interaction of abrasive particles is the deciding factor, while the design of nozzles and installation of obstacles did not influence noticeably the outcome of the process. Hence, the grinding of aluminum oxide and other materials, separation of required particle fraction, powder drying, liquid additions, granulation, blending or homogenization as well as processed powder precipitation from a carrying gas flow (dust collection), are achieved sequentially. Integrated theoretical and experimental investigations on the aeromechanics of high concentrated heterogeneous flows has allowed us to form a new method of powder technology on the basis of controlled circulating movement of the flow of “gas-solid particles” in closed volumes with the help of gas jets