Authors: A.V. Ugolnikov, V.N. Makarov, N.V. Makarov, Lifanov

Title of the article: Dimensionless equations - fundamentals of hydrovortex classification technology of finely dispersed technogenic wastes

Year: 2019, Issue: 5, Pages: 74-83

Branch of knowledge: 25.00.21 Theoretical foundations of the design of mining systems

Index UDK: 622.23.05

DOI: 10.26730/1999-4125-2019-5-74-83

Abstract: Rationale. The usage of technogenic mineral formations (TMF) in manufacturing of high-tech products is a relevant, adequate strategy for improving the structure of Russia’s GDP. Nowadays the active implementation of TMF recycling is limited by the high requirements for fractional composition, median sizes and TMF particles dispersion. One of the limiting factors for improving the efficiency of fine TMF recycling is a weak sufficiency of technique and technology and their classification. Strict classification requirements for the dispersion of median sizes of fine TMF specify the necessity of the search for the methods and technical means of their implementation, which, under the conditions of probability distribution of physical and mechanical, geometric, kinematic parameters of nanoparticles can effectively implement them. To ensure high-quality raw materials in the production of materials with unique properties, it is necessary to find the technology in which the classification by the dispersion of the median size of TMF particles will be self-similar, i.e. independent of their physical and mechanical characteristics.
Research goal. Graphical analytic simulation and setting up criterion equations of the inertial hydrovortex kinematic classification in the fluidized bed of TMF particles to create the device for its implementation in the form of a Venturi hydrovortex classifier.
Research methods. The methods are based on a scientifically established and experimentally confirmed hypothesis for the decisive influence of forces of the inertial unsteady hydrovortex process on the motion trajectory of TMF particles, their interaction with the rotating liquid droplets in the plane of the boiling bed in relation to the forces driving the boiling bed. Whereby the minimum diameter of absorbed hydrophobic particles depends on the angular velocity of the liquid droplet rotation.
Research results. Graphical analytic model and similarity criteria of hydrovortex inertial kinematic classification of TMF micro- and nanoparticles have been set up making it possible to determine the geometrical parameters and energy characteristics of a hydrovortex Venturi classifier, its aerator, the position of the receiving hoppers depending on the required performance and the energy characteristics of the hydrovortex aerator. Equations of motion and criteria equations of a finely dispersed system containing liquid droplets with TMF particles integrated in them under the conditions of unsteady hydrodynamic inertial suprastock motion in the classification process in terms of Euler and Reynolds numbers have been obtained. The dependence of the absorbed particles diameter of the bulk TMF components on the angular velocity of liquid droplets rotation in the process of hydrovortex classification has been confirmed. The dependence of the relaxation time of liquid droplets with TMF micro- and nanoparticles integrated in them in the process of hydrovortex classification on their median size has been set up. The tests of the commercial prototype of a hydrovortex Venturi classifier GKV-280 have been carried out.

Key words: Recycling classification hydrovortex inertial kinematic coagulation Venturi pipe Reynolds and Euler numbers

Receiving date: 08.08.2019

Publication date: 31.12.2019

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