Rotary mill

Rotary mill comprising a cylindrical shell (16) lined with an interior lining and intended to contain material to be ground and a charge of grinding implements, in which the lining, which is made up of rings of juxtaposed individual lining plates, has interior longitudinal lifting profiles to encourage the lifting of the charge and of the material to be ground as the mill rotates, characterized in that each plate has, on the rear face, when viewed in the direction in which the mill rotates, a step (10b, 12b, 14b) of a radial height that is taller than the front face, in that each ring of plates comprises several different types of plate (10, 12, 14) which differ in terms of the radial height of their step (10b, 12b, 14b) and in terms of the nature of their material, which follow on from one another, in the circumferential direction, in a determined order, and which are axially aligned and in which a certain number of one of the types of plate (10) are attachment plates (10a) bolted to the shell (16), all the other plates not being attached to the shell (16) by bolts but being held in place by a simple arch bracing effect.