The article considers a method for increasing the production efficiency of fine powders. It is shown that modern air separators do not have high efficiency. A method for increasing the efficiency of air separators is proposed. It is noted that the main characteristic of the separation process is the separation curve, with the help of which a dispersed composition of fine and coarse products can be found. The calculation is made taking into account the turbulent diffusion of separation air in the casing of the air separator, and also the constructive features of the separator in question. The separation function is proposed taking into account the proposed technical solution.

The article addresses the issue of grinding cement clinker in ball mills. The world various activities increasing the efficiency of the ball mills with low efficiency are presented and offered in the article. An effective way to increase the efficiency of ball mills is to transfer them to a closed circuit of work with air separators. To improve the air separator efficiency, the article proposes a modified aerodynamic design of the air separator. The parameters of the components included in the aerodynamic scheme, such as cyclones, dampers, a fan, a rotary valve and so on, are determined. A mathematical model of the modified separator operation recorded for the circulation circuit and the main direction of the path are proposed. According to the proposed method, an industrial air separator was calculated to obtain the fine powders. It is shown that by controlling the proposed aerodynamic scheme gas material tract air separator parameters, the separation process can be controlled.

The article is devoted to the question of improving the efficiency of grinding cement clinker. To improve the efficiency of grinding in ball mills closed circuit is proposed in the separation system to introduce fresh air. It is proposed to discharge excess separation air into a high-capacity filter. To solve this problem, the article makes a number of assumptions. For the calculation of the separation system, the expressions of the conversion of the initial product in the separator and flues of the system are given. The values of the concentration of the solid phase in different parts of the gas path of the separator are determined. On the basis of the obtained formulas, a system of equations is obtained, which allows to find the mass flow rate of fresh air. It is necessary to maintain the desired temperature of the separation process and the finished product. The dependence of the temperature of the finished cement on the volume of fresh air is obtained by the example of a closed circuit cement ball mill of the Belgorod cement plant.

Various designs of inertial concentrators for cleaning dusty air are considered. The analyzed designs of devices for separating dust particles by fractions also have a number of disadvantages: low fractional efficiency and complexity of structures when divided into several fractions. The design of an inertial dust concentrator with adjustable parameters is proposed. This design of the concentrator provides an increase in fractional efficiency and a decrease in hydraulic resistance with the simplicity of the apparatus design. Three-dimensional modeling of the spatial motion of air in an inertial dust concentrator with adjustable parameters is performed. A system of equations describing gas-dynamic flows is given. The results of calculations of velocity and pressure in an inertial dust concentrator with adjustable parameters are presented. Reflecting vanes and a false wall inside an inertial concentrator act as deflectors, that is, deflect the flow, which leads to an increase in the time spent by suspended particles in the inertial concentrator and a decrease in their kinetic energy. In this case, the role of inertia forces on the motion of particles will increase. Numerical modeling of the three-dimensional air flow in the concentrator made it possible to obtain a flow pattern and the main flow characteristics (velocity and pressure) from the moment of air supply to the concentrator to the moment of establishing the flow.