DEVICE FOR SEPARATION OF LUMPY CLAY FROM COMMERCIAL MINERAL Russian patent published in 1994 - IPC

FIELD: concentration of useful minerals. SUBSTANCE: working tools are arranged in tiers whose number depends on the number of concentrated feedstock fractions. Said tiers comprise blocks of two and more rolls of different diameters. The first roll along direction of rotation in the block has the maximum diameter. Diameter of each following roll is smaller than that of preceding roll in one block. Blocks may be disposed in steps within the limits of one tier. Roll rotation axes within the limits of one block lie in one and the same plane. EFFECT: improved design. 4 cl, 3 dwg