Rounding machines for particles with a layer structure, namely, graphite, sheet silicate, metal disulphide; Rounding units in the nature of spheroidization machines for particles with a layer structure, namely, graphite, sheet silicate, metal disulphide; Sieves being machines used in the rounding of particles with a layer structure; Dust filters being parts of machines; Dust separators; Cyclone separators; Magnetic separators in the nature of machines used to round particles with a layer stru...