Method and device for preparing and separating a material comprising a composite multi-substance system

The invention relates to a method for preparing and separating a material comprising a composite multi-substance system. The material is hereby fed as feed material to a roller mill. An in-bed attrition takes place in the roller mill by means of grinding rollers in a grinding bed, wherein the material is reciprocally attrited through shear stresses and abrasion. The roller mill is operated in such a way that the grinding bed has a minimum height that is greater than the diameter of one of the particles of one of the two compo-nents, and the pressing force of the rollers is selected in order to achieve a contact pressure in the range of from 50 kN/m2 to 140 kN/m2 with respect to the vertically pro-jected area of the average roller diameter. Furthermore the invention relates to a vertical roller mill which is further developed to carry out the method according to the invention.