METHOD OF SPHERICAL POWDER PRE-DRYING Russian patent published in 2013 - IPC C06B21/00 F26B3/08 

FIELD: process engineering.

SUBSTANCE: invention relates to production of spherical powders for small arms. Method of spherical powder drying including spherical powder with graphite feed into air transport line and, via cyclone precipitator, to drier whereat powder with graphite at 50 to 100°C is fed via air transport line to preheater composed of two-stage tube. Spherical powder and air heated in vortex flow to 95-105°C are fed to the first stage while air heated in vortex flow to 95-105°C is fed to second stage. Dried spherical powder with moisture content of 8-10 wt % is fed to final drying.

EFFECT: complete removal of surface moisture, decreased moisture content from 18-22 wt % to 8-10 wt %, fast drying.

1 dwg, 1 tbl, 5 ex