Method for separating superfine stone powder and nano clay from limestone mine tail mud

The invention discloses a method for separating superfine stone powder and nano clay from limestone mine tail mud, which comprises the following specific steps: 1) carrying out decoagulation fluidization on the tail mud: adding a decoagulant into limestone mine tail mud flocculate mainly containing a polymeric flocculant, clay particles and superfine stone powder to improve the flowability and dispersity of the tail mud; (2) directional dispersion treatment of clay: adding clay into the tailing slurry for directional dispersion, enabling the clay to be adsorbed on the surface and interlayer of the clay in a directional manner, and dispersing the clay into nano-particles so as to separate the nano-particles from the superfine stone powder; and (3) cyclone separation of the superfine stone powder: guiding the tailing slurry subjected to directional dispersion treatment into a cyclone separator, and separating the superfine stone powder from the nano-clay by utilizing centrifugal force. According to the method d