FLSmidth Krebs CycloWash™ is also used for washing of solids for separation of soluble values or contaminants. The CycloWash™ permits the injection of elutriation liquor in the lower section of the hydrocyclone so that fine particles in the underflow, or solubles in liquid phase of the hydrocyclone feed stream, can be displaced and discharged with the hydrocyclone overflow. Because the device is inexpensive and relatively little injection water is needed for effective diplacement of slimes, the CycloWash™ offers a low cost means for improving cyclonic classification. As shown in the illustration, liquid is injected through the CycloWash™ attachment located in the lower cone/apex section of the hydrocyclone. The injection liquid serves as the displacement agent of fine particles entrained in the underflow pulp. In this secondary classification within the hydrocyclone, displaced fines rise within the center of the hydrocyclone joining the hydrocyclone overflow pulp. The coarse solids are thickened and discharged through the apex as a well deslimed underflow.
For separation of soluble values or contaminants, fresh injection liquor is used in the CycloWash™ as a washing agent to help displace liquid containing solubles with the hydrocyclone overflow.