METHOD AND SYSTEM FOR THE PRODUCTION OF SELECTED CRYSTAL NUCLES WHICH ARE USED FOR CONTINUOUS OR DISCONTINUOUS CRYSTALIZING APPARATUS, IN PARTICULAR USES IN THE REPRODUCT OF SUGAR PRODUCTION

摘要

A seeding magma for seeding a solution of a crystallizable product is prepared from a suspension the crystals in a liquid phase. This suspension is delivered into a continuously rotating conical basket of a centrifugal drier. The basket has an upper output end and a screen is mounted therein. Rotation of the basket causes the suspension to be subjected to centrifugal forces causing crystals of a size interior to the mesh size of the screen to pass with the liquid phase through the screen and larger crystals to be retained on the screen and centrifugally displaced towards the upper output end and ejected therefrom. These crystals are forcefully projected against an impact surface disposed around the output end of the basket whereby the projected crystals are crushed on impact with the surface. The crushed crystals are recycled into the suspension delivered into the basket while the liquid phase with the crystals passed through the screen is removed for preparing the seeding magma.