Hydrocyclones, also known as liquid cyclones, are important devices for the separation of solid-liquid suspensions. The principle employed is centrifugal sedimentation, i.e., the particles in the suspension are subjected to a centrifugal force, which causes their separation from the fluid. Hydrocyclones do not have moving parts, require a low installation and maintenance investment and are simple to operate. Mojan hydrocyclones are made of a cylindrical compartment in which, because of the tangential face, water rotates before leaving through an axial overflow pipe. The concentrated sludge leaves through the cone bottom. Mojan hydrocyclones are widely utilized in mineral, chemical, petrochemical, textile and metallurgical industries.