Technological principles of drying into layer fluidizated and its application for kaolin dry enrichment
gas-dispersed turbulent flows, drying in vortex devices, kaolin enrichment
Abstract
The model of numerical calculation of drying in vortex devices and particle-classifying devices is given.
In a swirling stream, drying and simultaneous grinding of natural aggregates occurs due to friction and collision of particles of diferent mass and nature with each other and their separation. This ensures the achievement of high dispersion of clay and the preservation of the structure and size of sand particles.
The construction of the installation was carried out based on the results of mathematical modeling of the processes embodied in the technological ideas of kaolin enrichment, the calculation model of which is given below.
Three-dimensional models for calculating gas-dispersed turbulent flows in the presence of heat and mass transfer were used to simulate the drying and classification of clay raw materials. Since the layer in the lower part of the chamber is not formed, the main role of the rotor consists in the initial destruction of the wet aggregates of the feed material.
Taking into account that the wear of the rotor increases with the energy of collision of the material with the rotor, and the collision energy quadratically increases depending on the rotor speed, it is desirable to reduce the rotor speed to increase its service life, as long as the rotor provides initial destruction of the material lumps, but does not destroy grains of sand in the feed material.
The results of industrial introduction of drying-separation plants in the processes of kaolin enrichment are described.
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