Hydro-Vortex Classification of Composite Microparticles

Abstract

The use of nanomaterials for the implementation of a new set of functional properties has no alternative when creating refractory composite materials. Fine-dispersed Al2O3 is a necessary component of special high-quality cements, heat-resistant inert refractories and abrasive materials. Equations are obtained for the average values of the Euler and Reynolds criteria, the relaxation time of liquid droplets with integrated nanoparticles depending on their median size in the process of hydro-vortex classification. The tests carried out confirmed that under the conditions of self-similar hydro-vortex coagulation in the process of hydro-vortex classification, the inertial forces acting on the unsteady hydro-vortex motion of the dispersed system a drop of liquid — a microparticle of material, significantly affect the trajectory of its motion in comparison with the forces acting in the direction of motion of the fluidized bed of dispersed material. In this case, the control action provides a constant relaxation time, which significantly increases the efficiency of the influence of the angular velocity of droplet rotation on the classification process. Thus, inertial hydro-vortex classification in the self-similarity mode makes it possible to control the trajectories of motion of microparticles. At the same time, the energy of the translational motion of liquid droplets, determined by the characteristics of the hydro-vortex nozzles of the aerator, ensures the constancy of the time of the inlet manifold of the receiving hopper for relaxation, allowing the median diameter range of 0.5 × 10–6 – 5 × 10–6 m to be provided with a dispersion of no more than 20 % on their median diameter with a larger width of the inlet header of the receiving hopper.