Filters horizontal leaf

Vertical Vessel, Horizontal Leaf Filters. These filters, like all horizontal leaf filters, are advantageous where the flow is intermittent or where thorough cake washing is required. Filtration areas are limited to about 45 m. ... 

Horizontal Vessel, Horizontal Leaf Filters. These filters consist of a horizontal cylindrical vessel with an opening at one end (Fig. 19). A stack of rectangular horizontal trays is mounted inside the vessel the trays can usuaUy be withdrawn for cake discharge, either individuaUy or in the whole assembly. The latter case requires a suitable carriage. One alternative design aUows the tray assembly to be rotated through 90° so that the cake can faU off into the bottom part, designed in the shape of a hopper and fitted with a screw conveyor. 

The trays may be fitted with rims this is particularly useful for flooding the trays in washing operations. Scavenger leaves are often used. FUtration areas up to 50 m are avaUable. Like aU horizontal leaf filters, horizontal vessel, horizontal leaf filters are particularly suitable when thorough washing is needed. 

Horizontal belt pressure filters, 11 379 Horizontal belt vacuum filter, 11 354-355 Horizontal box heaters, 19 511 Horizontal current classifiers, 16 619 Horizontal Feret s Diameter (HFD), 16 147 Horizontal injection wells, 16 613 Horizontal leaf filters, 11 366-367 Horizontal magnetic field-type (HMC), 23 857... 

Horizontal leaf filters OMD leaf filter Vertical leaf filters Leakage, in FETs, 22 253, 254 Leakage prevention, pumps for, 21 76 Leak detection and repair (LDAR) program, 10 70, 71-75 14 205 Leakers, 10 70, 72 Leak frequency, 10 72... 

Kieselguhr removal is easiest with the rotary horizontal leaf filter and the plate and frame filters are most difficult. However considerable strides have been made in reducing the complexity and labour requirement of the latter. 

In the brewing process diatomite is used as precoat and body aid on candle filters and horizontal leaf filters. Hermia Brocheton [1993] give a conparison of these methods and cite typical precoat dosage as 1.5 kg/rn and body feed dosage as 1 kg/rn with a cake average specific resistance of lO m/kg. Other aspects of diatomite filtration are discussed comprehensively in a historical review by Cummins [1973]. 

FQtration with Filter Aids. A wide range of pressure and vacuum cake filters can be used with both precoat and body aid fihration. Most of these operate in the batch mode and include the filter press, the vertical and horizontal leaf filters with sluice or centrihigal disduuge and the vertical tubular fih . The rotary drum vacuum fitter works in a semi-batch shion in that the precoat is removed progressively as the fitration proceeds. 

The problem of discharge fiom horizontal leaf filters for larger sizes than indicated above has been resoked in filters which spin the stack after conpletion of the cycle, Figure 11.50 the economics of these filters, their design and operation have been reported [Howard, 1979]. 

Pressure-vessel leaf filters (a) vertical-tank, vertical-leaf filter, and (b) horizontal-leaf filter. 

Figure 6.2 Schematic diagram of a multielement, horizontal leaf filter cycle, (a) Filtration (b) displacement washing (c) gas deliquoring (d) preparation for cake discharge by element removal.

Vertical-vessel, horizontal-leaf filters (Figure 12.8)... 

Figure 12.8 A vertical-vessel, horizontal-leaf filter...

Industrial filtration units can be either batch or continuous in operation. In addition to the plate and frame filter press of Figure 14-1, there are leaf filters that also function in the batch mode. Figure 14-5 shows both a vertical leaf filter and the filter leaf itself. Other leaf filters include a Niagara type (Figure 14-6), which uses a horizontal leaf filter, and the Sweetland type (Figure 14-7), which consists of two half-cylinders that allow the bottom half to be opened downward to access vertical disk-shaped leaves. 

Figure 14-6. Horizontal leaf filter. (Courtesy of Niagara Filter Division, American Machine and Metals Inc.)...

Recent innovations in the filtration of muds include the use of tighter filter media. A clearer filtrate is obtained, which can be sent to the evaporators without reprocessing. The Eimcobelt rotary vacuum filter uses a tight filter cloth that is continuously removed from the drum and washed with hot water. Another approach is the direct filtration of muds with horizontal leaf filters (Fas Flo Filters). One process uses polyelectrolytes to increase the filterability of the muds through cloth filters (Rapid-Floc system). 

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