Centrifuges automatic batch

Centrifugal Sedimentation Equipment. Commercial sedimentation centrifuges are characterized priacipaHy by how soHds are discharged, and the general dryness of these soHds. There are batch and automatic batch soHd bowl machines which coUect the soHds at the bowl wall. SoHds are removed very dry. Almost any soHd is coUectable, even those that are very soft and compressible. 

Fig. 4.23 Automatic batch liquid-liquid extraction configuration based on phase separation by centrifugation. (Reproduced from [20] with permission of the Association of Official Analytical Chemists).

In most cases, crystals are recovered from ammonium sulfate slurry by recycling through the continuous or the automatic batch-type centrifuge, wherein the product is screened and spin-dried, washed with water and weak ammonia, and again spin-dried before being conveyed to the drier. In some plants, continuous top-feed filters -... 

In general, soHds-retaining batch and batch automatic machines are limited to low feed concentrations to minimize the time required to unload the soHds. Continuous disk centrifuges can have higher feed concentration. The limit is the underflow concentration. Conveyor discharge centrifuges can handle high feed concentration and are limited only by the volume of soHds displacement, or torque capacity. 

A suitable automatic cyclic batch centrifuge for this second stage is shown in Figures 6 and 7. It consists of a perforated rotor or basket that runs continuously at full speed on a horizontal axis. The entire rotating assembly is contained in a casing that may be pressurized to meet system requirements with a... 

Centrifuges may be batch, batch automatic, or continuous. Handling of the separated solids is the primary reason for the difference in operating modes. Therefore, a centrifuge type may be a batch operation when separating solids from liquids, but a continuous one when separating two immiscible liquids. 

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