Horizontal rotary filter

Representative commercial sizes of some types of pressure filters for operation in batch modes are reported in Table 11.11. Some of these data are quite old, and not all of the equipment is currently popular thus manufacturers should be consulted for the latest information. Commercially available size ranges of continuous belt, rotary drum, rotary disk, and horizontal rotary filters are listed in Table 11.12. For the most part these devices operate with vacua of 500 Torr or less. 

An example of a horizontal rotary filter is illustrated in Figure 5. These machines are well suited to filtering quick-draining crystalline solids. Due to its horizontal surface, solids are prevented from falling off or from being washed off by the wash water. As such, an unusually heavy layer of solids can be tolerated. The basic design consists of a circular horizontal table that rotates about a center axis. The table is comprised of a number of hoDow pie-shaped segments with perforated or woven metal tops. Each of flie sections is covered with a suitable filter medium and is connected to a central valve mechanism that appropriately times the removal of filtrate and wash liquids and the... 

The two forms of horizontal rotary filter differ primarily in the manner in which the filter cloth is arranged around the periphery of the circular separation surface. 

Horizontal Rotating Pan Filters. These filters (Fig. 10) represent a further development of the tipping pan filter for continuous operation. They consist of a circular pan rotating around the central filter valve. The pan is divided into wedge-shaped sections covered with the filter medium. Vacuum is appHed from below. Each section is provided with a drainage pipe which connects to a rotary filter valve of the same type as in dmm filters. 

Disk Filters Disk filters consist of a number of concentric disks mounted on a horizontal rotary shaft. The operating principle is the same as that of rotary-drum vacuum filters. The basic design is illustrated in Figure 22. The disks are formed by using V-shaped hollow sectors assembled radially about a central shaft. Each sector is covered with filter cloth and has an outlet nipple coimected to a manifold... 

Agitated/Monoplate Nutsche Filter/Dryer Horizontal Plate Filter/Dryer Continuous Equipment Rotary Drum Filter Centrifugal Filter Horizontal Belt Filter... 

Horizontal mills, 16 65 Horizontal reactor, 22 154, 155 Horizontal retort process, for zinc, 26 577 Horizontal rotary tilting-pan filters,... 

The horizontal rotary table filter incorporates, as its name suggests, a horizontal rotary circular table divided into segments or drainage compartments, each of which is ported to a rotary valve underneath the table. The top surface of the table is fitted with a filter medium and walls are provided around the periphery of the table and around the hub. The feed slurry is distributed across the table through a feed box and vacuum is applied to... 

Cycle times, air rates, and minimum cake thicknesses in operation of rotary drum filters are stated in Table 11.13. A few special applications of horizontal belt filters are given in Table 11.14, but in recent times this kind of equipment is taking over many of the traditional functions of rotary drum filters. Belt filters are favored particularly for fieely filtering slurries with wide range of particle sizes. 

Horizontal vacuum filters are found in two basic designs, rotary circular and belt filters. They provide flexibility in cake thickness, washing configuration, and drying time. They are effective for heavy dease solids, but they are anpensive, require a large floor space, and are difficalr to enclose for hazardous applications. 

Horizontal belt filter. When the feed contains coarse fast-settling particles of solid, a rotary-drum filter works poorly or not at all. The coarse particles cannot be suspended well in the slurry trou, and the cake that forms often will not adhere to the surface of the filter drum. In this situation a top-fed horizontal filter may be used. The moving belt filter shown in Fig. 30.10 is one of several types of... 

To precipitate the desired potassium sulfonate, the filtrate [collected in receivers (3 and 3A), together with strong wash liquor] is transferred to the 20,000-liter rubber-lined precipitation tank (4) and the concentrated KCl solution is added. The temperature is maintained at 85°C to keep the byproduct 1,5-disulfonate in solution. The precipitated potassium sulfonate is isolated by continuous filtration on a rubber-covered rotary filter (5 and 6), where it is washed with 5 per cent potassium chloride solution and discharged at approximately 45 per hent solids content into a horizontal trough mixer (7), from which it is pumped to one of two 13,000-liter brick-lined paste storage tanks (8). The paste content is adjusted to 35 per cent solids and brought to neutrality with a small amount of soda ash solution, after which it is pumped either to an autoclave for conversion to 1-amino-anthraquinone or to the chlorinators for conversion to 1-chloroanthra-quinone. 

Horizontal Vacuum Filters These filters are generally classified into two broad classes rotary circular and belt-type units. Regardless of geometry, they have similar advantages and limitations. They pro-... 

A rotary filter (Figure 11.10) consists of a cylindrical drum covered with a perforated sieve which supports a filter cloth. The drum rotates around its horizontal axis at adjustable speed, in a tank equipped with an agitating device to homogenize the liquid and keep the filtration adjuvant in suspension during preparation of the filter layer. Diatomaceous earth may be used, but perlite also gives good results at lower cost. A vacuum, created inside the drum by a vacuum pump, draws tlie liquid in. A layer of filtration adjuvant is deposited on the drum during each... 

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