Vertical basket centrifuges

Spray Washing—Liquid is supplied via spray nozzles. It is the only effective way of working cakes which are uneven from the top to the bottom for basket centrifuge. 

Peeler centrifuges, being unaffected by the force of gravity in the distribution of the cake, tend to have more even cakes, although nonuniformity can still occur due to the feeding mechanism. 

Vertical basket centrifuges have been the work horse for the pharmaceutical industry for many years for intermediate and final filtration steps. Chemical and specialty chemical productions use this type of equipment in a wide range of applications 

The cycle is similar to that of a household washing machine, filling, spinning or dewatering, washing, a final spin and unloading. The feed is fed off to one side. This, coupled with the force of gravity in the vertical basket 

Operating batch-wise, basket centrifuges in general are optimized best when operated almost continuously by feeding the machine at the same rate as the slurry is dewatering, thus maximizing solids concentration. Loading the basket infinitely fast will only produce a basket with the same solids concentration as the feed tank. 

---

On slow draining systems with drain rates less than 20 pounds per sq. foot per minute, the larger screen area of the vertical basket centrifuge per unit of cost may make its use economically attractive even on systems where rubber coating is not necessary. It is also available in Monel metal and stainless steel construction. 

Mechanical Design The vertical basket centrifuge is equipped with a cylindrical basket rotating about the vertical axis. The basket shell is normally perforated and lined with filtration media consisting of filter cloth, and backing screens to provide liquid drainage paths to the basket holes. Securing the filter cloth may be by hook and loop attachment or with snap-in retainers. 

FIG. 18-162 Top unloading vertical basket centrifuge. (Krauss Majfei Frocess Technology.)... 

Figure 3. Vertical basket centrifuge (manual unloading).

Out of balance conditions usually occur due to feeding of an unbalanced load or uneven cake. This is more likely in vertical basket centrifuges than horizontally mounted systems. It is less common in an Inverting Filter Centrifuge due to the central feed distribution. 

FIG. 18-164 Typical vertical basket centrifuge installation. (Krauss Majfei Process Technology.)... 

Possible option Continuous pusher Peeler centrifuge Vertical basket centrifuge Multichamber vertical solid bowl sedimentation centrifuge, 16.11.5.11 Sedimentation centrifuge, 16.11.5.11... 

Medium-speed filtering materials are suited to vacuum equipment and filtering centrifuges like peeler or vertical basket centrifuges. 

FIGURE 3.4 10 Filtering vertical basket centrifuges (a) feed and separation phase and (b) solids-dis-charging phase. 

Possible option continuous pusher peeler centrifuge vertical basket centrifuge multichamber vertical solid bowl sedimentation centrifuge. Section 5.12 sedimentation centrifuge, Section 5.12... 

Figure 1.17 Photographs of a siphon peeler centrifuge (/eft), with permission from Mitsubishi Kakoki Kaisha (under license from Krauss-Maffei), and a vertical basket centrifuge [right] with permission from Mitsubishi Kakoki Kaisha.

---