METHOD OF PRODUCING FINE AGGREGATE OF IMPROVED QUALITY AND EQUIPMENT COMPLEX FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC B07B9/02 B07B1/22 

FIELD: construction.

SUBSTANCE: group of inventions can be used to produce a fine aggregate of improved quality from natural sand and sand from crushed rock screenings with a screened fraction less than 0.1 mm with the addition of finely ground mineral material for its use in concrete. A method for producing a fine aggregate of improved quality is proposed, based on separating gravel grains larger than 5 mm due to screening sand and separating the sand into two fractions. As the first fraction, the fraction of 3-5 mm, and as the second fraction, the fraction less than 3 mmis chosen. The first fraction is sent to the first intermediate accumulation hopper. The second fraction is sent to a drum screen with a mesh of 0.1 mm, fixed on its walls. The drum is installed at an angle of 10° to move the sand inside it, the sand falling into the drum is rotated together with the drum, and the particles of 0.1 mmare sifted out. Through the entire drum length, nozzles are installed from above on the outside, by means of which the drum screen is blown by compressed air. The separated fine fraction with the air coming from the nozzles is sucked by an air pump into exhaust ventilation, the inlet channels of which are placed under the drum opposite the nozzles. The exhaust ventilation is equipped with a system for cleaning air from small particles. The material that has passed through the drum screen with a dimension of 0.1-3.0 mm is sent to the second intermediate hopper. The finely ground aggregate is placed in the third intermediate hopper. The materials placed in three intermediate hoppers are dosed, mixed together, and the result of mixing in the form of finished products is loaded into vehicles for delivery to consumers. The method is carried out using a complex including a vibrating flat screen, a drum screen, three intermediate hoppers, three screw feeders, a screw mixer, a compressor, an air pump, and a filtration system.

EFFECT: improving the efficiency of producing a fine aggregate of increased quality.

2 cl, 2 dwg, 2 tbl