Bowl classifiers

Basically a hydraulic bowl classifier. Vibrating plate replaces rotating mechanism in pool. Hydraulic water passes through perforations in plate and fluidizes sands. 

Ilvdrocvclones are rapidly talcing over the functions formerly handled bv bowl classifiers because of lovv er capital costs and floor-area requirements. 

Bowl Desilter The bowl desilter provides for separation areas vv ell bevond areas possible in bowl classifiers, in which larger sizes are limited bv mechanical design. Its use is in operations involving large flow volumes and fine separations. Rake tonnages can be great or small with a devv atering compartment to suit the conditions. 

Bowl classifiers are shallow bowls with concave bottoms, fitted with rakes. Their operation is similar to that of thickeners. 

The bowl classifier, which is used for fine materials, consists of a shallow bowl with a concave bottom as shown in Figure 1.31. The suspension is fed into the centre of the... 

In the wet process, the solid material, after dry crushing, is reduced to a fine state of division in wet tube or ball mills and passes as a slurry through bowl classifiers or screens. The slurry is pumped to correcting tanks, where rotating arms make the mixture homogeneous and allow the final adjustment in composition to be made. 

Botvl Classifier The bowl classifier was developed to provide more separation area necessary for fine separations consistent with high tonnage. In essence a shallow bowl with revolving plows is superimposed over a rake or screw dewatering section. Feed enters at the center of the bowl, and fine solids overflow at the periphery. Coarse solids collected on the bowl bottom are raked to the center for discharge into the dewatering compartment below where wash water may be added for counterflow. 

In the bowl desilter the rotating blades in the bowl plow outward and discharge settled coarse material at the periphery, where it drops into the drainage compartment. This configuration does away with the long cantilevered rake construction necessary in bowl classifiers. 

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