METHOD OF SCREENING AND SCREEN TO THIS END Russian patent published in 2011 - IPC B07B1/22 

FIELD: process engineering.

SUBSTANCE: invention relates to processing of mineral resources, dressing of minerals and is intended for classification of crushed stock to coarseness. Proposed method comprises feeding initial stock onto revolving inner screen made up of two or more concentric screens. Note here that every two adjacent screens run in opposite directions. It comprises also uniform distribution of stock on inner cylindrical surface of bottom section of every next (outer) screen drum by scrapers arranged along screen generatrix. Screen is made up of two or more concentric screens. Note here that every two adjacent screens run in opposite directions. Every inner cylindrical screen is provided with scrapers arranged along generatrix on outer side. Said scrapers may feature the shape of comb or rack. Said scrapers allow adjusting the gap between their extending sections and screen inner surface. Scrapers are equipped with elastic base or spring-loaded tie rods. Screen is equipped with outer cylindrical conveying shell to collect and transfer mesh minus.

EFFECT: higher efficiency and quality.

6 cl, 2 dwg