Particle Size Effects on Selectivity in Confined Bed Comminution

Confined bed comminution in high-pressure grinding rollers (HPGRs) and vertical roller mills (VRMs) was previously used preferably for comparably homogeneous materials such as coal or clinker. Meanwhile, it started to complement even replace tumbling ore beneficiation with gangue particles of rather different breakage behaviors. The selectivity the a mixture strengths but similar particle size distribution (PSD) constituents investigated earlier. strength material is, however, also function size. Finer tend be more competent than coarser ones same material. In industrial processing using confined comminution, this effect cannot neglected exploited increase efficiency. This paper presents research results on topic based experimental investigations model natural particles, which were stressed piston–die press. It appeared that result substantially depends characteristics, composition PSD constituents. Conclusions will drawn future applications selective mineral processing.