The apparatus comprises a housing mounted on a framework and accommodating therein an annular inductor encircling a mixing chamber and adapted to create a rotating electromagnetic field in said chamber. Ferromagnetic particles are present in the mixing chamber. The mixing chamber communicates from above with a charging device including a feed screw continuously supplying solid components of the suspension directly into the chamber; liquid components of the suspension are fed into the chamber through the hollow shaft of the feed screw. Connected from below to the mixing chamber is one end of an S-shaped conduit acting as a discharge device. The apparatus provides rapid and effective mixing of the components of the suspension.