Abstract: The invention concerns a method of grinding combustible products by means of closed-circuit pendulum ring roller mills, comprising a top ring, serving as a support for the running track of the mill, and a base structure provided with a grinding sole plate, preventing the deposition of combustible particles in the air inlet circuit of the mill. The invention also concerns closed-circuit pendulum ring roller mills for implementing such a method.

Abstract: The invention concerns a pendular grinding apparatus comprising an inner vertical wall (1) rotating about a main vertical axis (2) and forming a runway (3) for grinding, a support (4) coaxially arranged above the runway (3) and designed to be driven in rotation about the main axis, at least two grinding rollers (8) comprising each a rotating surface (9) about an axis of rotation (10) suspended to the support (4) and arranged such that the rotating surface (9) of each roller should run against the runway or against the material to be ground between the roller and said runway (3), a pressing action of each roller (8) on said runway or on said material to be ground supplied between them resulting from a centrifugal force (Fc) of each roller driven in rotation by the support, the grinding apparatus comprising means (12) designed to combine with the centrifugal force (Fc) of each roller an adjustable force and said combining means (12) being supported therefor on a common central element (14) which can be either f