DRYING METHOD OF PELLET POWDER Russian patent published in 2016 - IPC C06B21/00 

FIELD: technological processes; weapons and ammunition.

SUBSTANCE: invention relates to production of spherical powders (SP) for small arms, namely to powder drying. For drying powder with moisture content of 18-22 wt% and graphite is fed via settling cyclone in continuously acting fixed drier, in lower part of which there is a box, divided into three sections for supply of heat carrier. On top of the box in the inner part of the drier grid is installed to create air pressure under screens. On each side of the box is installed in vertical plane at an angle of the wall with blow-out surface. In the first section the powder is dried at air temperature 93±5 °C, in the second section at temperature 70±5 °C, and in the third - 50-60 °C. Drying is performed in boiling conditions. Height of boiling layer powder on the screen is controlled by separation grids. Boiling layer on the screen move due to difference of air supply to the section of the box. Common drying cycle 1.0-2.5 h, efficiency of the dryer 200-300 kg/h at moisture content of dry powder 0.3-0.9 wt%.

EFFECT: method provides safe and effective drying of powder and production of powder with preset physical and chemical properties with minimum labor costs and power consumption.

1 cl, 1 dwg, 1 tbl, 5 ex