Patent ID: 7347113

Claim:
Method for evaluating the filling ratio of a tubular rotary mill comprising a cylindrical barrel rotating around its longitudinal axis, the contents of which comprise a load of grinding medium made of metallic alloy and of material to be crushed which forms the pulp inside the mill as and when it is crushed, in which the contents of the mill chiefly occupy, during its rotation, and viewed in the direction of rotation, the fourth trigonometric quarter of the section of the mill, whilst the bottom of the contents extends into the third trigonometric quarter and the top is raised into the first trigonometric quarter, wherein an algorithm is established by means of a model and defines a relationship between the filling ratio of a mill on the one hand and the angular positions of the bottom and top of the contents of the mill as well as the power absorbed on the other hand, wherein the angular positions of the bottom and top of the contents are measured in the mill for which the filling ratio is to be determined as well as its absorbed power, and wherein the filling ratio of the mill is determined by means of these measurements and the algorithm.