Thebeneficiation offinecoalbydensemedium cyclone
difficult coals, only dense medium processes will, ina singlestage, giveanefficiency oftheorder required''. Asfar back as 1949, Van der Walt2 indicated that reasonably sharp separations ofminus 0,5mmmaterial couldbeeffected inadensemedium cyclone, andin1977 Fourie andErasmus3 indicated that an