Abstract: A dispersion mixer is disclosed for breaking up and dispersing agglomerated particles in a liquid medium. The mixer has the capability of causing high speed particles to strike each other in such a manner as to develop their maximum shear energy potential and thus be more efficient than existing dispersion mixers. The mixer operates in a container and has a first rotor shaft extending downwards at the approximate center of the container, a second rotor shaft substantially parallel to the first rotor shaft, spaced from the first rotor shaft, at least one mixing rotor disc mounted on the first rotor shaft, and at least one mixing rotor disc mounted on the second rotor shaft, a first drive for rotating the first rotor shaft about its own axis, and the second rotor shaft about its own axis, and a second drive for moving the second rotor shaft in a circumferential path about the first rotor shaft.