METHOD FOR AIR CLASSIFICATION OF POWDER, GRANULAR, LUMP MATERIALS IN A FLUIDIZED BED AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC B07B4/00 

FIELD: technological processes.

SUBSTANCE: disclosed group of invention relates to separation of solid materials using gas or air streams, and more specifically to separation of powder, granular, lump materials by size, density, shape of particles in gas flow, mainly air, in fluidized bed formed by directed oscillations. Method for air classification of powder, granular, lump materials in a fluidized bed includes feeding into space of vertical shaft of initial material and an ascending air flow from below, feed rate of which is controlled in accordance with a defined particle size limit, large, heavy, different-shape particles output, separation and removal of small, light, differently shaped particles of classified material from gas or air flow. Amount of material fed into the classifier is controlled in accordance with the amount of gas or air supplied at a given rate of gas or air flow, in accordance with the rate of development of small, light, differently shaped particles of the classifiable material. Classified masses of material are advanced due to creation of fluidized bed obtained by directed vibrations of vertical shaft, or its lower part separated from main shaft by vibration isolating material. Method is carried out using a device comprising a vertical shaft, on inner walls of which there are overflow shelves, in upper part of shaft there is branch pipe output of small, light or different shape components, in the middle part of the shaft there is a dispenser for supply of classified material, in the lower part of the shaft there located is an air supply branch pipe, as well as an outlet branch pipe of large, heavy or differing in form components. Mine is equipped with vibrator, which generates directed vibrations of shaft with overflow flanges installed with stepped gap, with partial overlapping of each other. Under the overflow shelves a gas-air distributing grid is installed, which balances fields of gas or air velocities supplied to the classifier by means of a fan.

EFFECT: high efficiency of separation and quality of classification.

3 cl, 1 dwg