Abstract: 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.

Abstract: An installation for drying a liquid-containing particulate product comprises a supporting frame, a centrifugal separator removably mounted thereon and a large receptacle for the particles ejected from a discharge end of the separator basket supported on the supporting frame. The receptacle has a vertical wall defining an opening and the centrifugal separator is mounted for rotation about a horizontal axis and is arranged with the discharge end of the basket facing the opening in the vertical wall and extending into the receptacle whereby the particles are ejected into the receptacle upon rotation of the basket, the opening having a diameter slightly in excess of the diameter of the discharge end of the basket. The separator may thus be horizontally moved for placing it in position with the discharge end extending into the receptacle and for removing it without dismounting the receptacle.

Abstract: Process, centrifuge and installation for producing crystallization seeds, as for the sugar industry. A suspension of crystals produced from the seeded solution is subjected to a scheme of centrifugal separations whereby seeds falling within a predetermined size range are obtained for seeding the solution.

Abstract: A screen for a centrifuge basket is comprised of a frusto-conical sheet consisting of several sectors defining a multiplicity of apertures. The disposition of the apertures is the same for all screen sheet sectors. The screen sheet is divided into successive zones defined by concentric circles extending in planes parallel to the large and small bases of the frusto-conical sheet, and the apertures in the successive zones differ from each other. The apertures in the first zone adjacent the small base are round holes defining a small percentage of apertured area in the first zone. The apertures in the succeeding zones are slits inclined with respect to a generatrix of the respective sector. The angle of inclination of the slits grows from zone to zone towards the large base and all the slits in the same zone and sector have the same inclination.

Abstract: A slurry-feeding arrangement for a continuously operating, vertical, centrifugal filter includes a dish-shaped receptacle coaxially mounted on the hub portion of the bowl and a distributor having the shape of an inverted cup enveloping the receptacle and connected to the hub by radial arms of a spider plate integral with the receptacle. The slurry to be filtered is centrifugally deposited from the receptacle on the inner face of the distributor, and thinning of the deposited film of slurry on the segments of the distributor face between the arms and the open end of the distributor is prevented by radially open recesses on either circumferential side of each arm in the inner distributor face.

Abstract: A centrifugal drier comprises a rotary closure member mounted in the rotary drier basket and closing off the lower part of the interior basket chamber. Purging means is mounted on the periphery of the closure member and includes an annular element coaxial with the basket and having an exterior conical surface parallel to the conical wall of the basket. The exterior surface of the annular element is at a small distance from the screen and defines an annular ejection chamber open towards the basket wall. The annular element defines an annular inlet chamber open towards the rotary axis of the basket, a narrow passage connects the inlet chamber with the ejection chamber, and at least one fixed spray nozzle delivers a purging liquid to the annular inlet chamber.