METHOD AND APPARATUS FOR DRY MILLING OF SOLID SUBSTANCES (VERSIONS) Russian patent published in 1999 - IPC

FIELD: milling equipment. SUBSTANCE: method involves initial coarse milling of solid substances in controlled swirling fluidized flow; directing solid finely-dispersed substances upward to vortex milling zone; milling supplied solid particles in vortex milling zone by passing portion of particles through vortex milling zone. Vortex milling zone has at least one milling station, at which particle flow is directed upward through at least one horizontal vortex annular gap zone defined by immovable plate provided with round opening. Mixture of product is cleaned by removing rough particles by gravitational separation performed by means of centrifugal forcing out fan. Remaining portion of ascending flow of particles is processed by vertical swirling rotating semipermeable device having rotary unit with screen. EFFECT: increased efficiency in milling solid substances and simplified construction. 62 cl, 11 dwg