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 Krebs CycloWash®
The Krebs CycloWash™ is an ancilliary elutriation device that improves the desliming performance of Krebs Cyclones. It 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.
Features & Benefits:
Eight standard CycloWash™ KH Models are available for use with Krebs Cyclones of 3-inch through 26-inch diameter. The range of Models allows approximately 10-1000 GPM of injection liquid to be handled. The CycloWash™ bolt circle matches the flange details of standard hydrocyclone housings. Thus the addition of the CycloWash™ introduces no special requirements other than a source of constant pressure injection water.
The CycloWash™ is available in mild steel or stainless steel construction with internal surfaces protected with elastomer liners. A truncated cone protects and shields the water injection tubes from the abrasive slurry. The cone is available in ceramic or elastomer construction.Maintenance requirements for the CycloWash™ are similar to those of the Krebs Cyclone itself. Internal surfaces are protected with gum rubber liners, and water injection tubes are protected by means of the ceramic truncated cones, which shields the tubes from the abrasive pulp.
- Preparation of flotation tailings for mine backfill or tailings dam use
- Washing of sands for separation of soluble values or contaminants
- Desliming for Minerals Processing purposes:
- In flotation systems, especially for treatment of non-metallic minerals
- In preparing of feeds for separate sands/slime leaching
- Ahead of gravity concentration devices such as shaking tables and spirals
The Krebs CycloWash™ has been used to great advantage in the desliming of flotation tailings which are to be used as mine backfill or for tailings dam construction.
Both applications require thorough removal of finer particles so that drainage from the sands is rapid and the drained sands will have favorable load bearing characteristics. In the tests with the Krebs D10B Cyclone, the underflow pulp at 67.5 percent solids contained 19.3 GPM of water. Therefore, the 24 GPM of injection water represented close to 124 percent of the underflow water content. Optimum results are often achieved using an injection water rate equivalent to no more than 80 to 100 percent of the underflow water.
The CycloWash™ permits significant savings in the installation and operating costs of desliming systems. Older systems fequently involved two or more stages of gravity sedimentation, and even systems using hydrocyclones were designed using primary and secondary hydrocyclones with the corresponding duplication of sumps and pumps. The CycloWash™ makes it possible to achieve thorough desliming with only one set of hydrocyclones, and the quantity of injection water used will be less than that required for conventional two-stage systems.
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