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Vertical basket centrifuges operate at comparably lower g force, i.e., below 1000 times gravity. Vertical basket centrifuges are generally less expensive than horizontal ones. Therefore vertical basket centrifuges are favoured for this application since the advantages of a horizontal version comprise better machine cleaning, easier product change and easier separation of the process from the mechanical zone, which are not relevant for gypsum dewatering [12]. Filtration combined with sedimentation at higher g force results in ultimate dryness [13]. Moreover, discontinuous operational mode allows the various steps of filtration, washing and drying to be prolonged in principle indefinitely, although this would be at the expense of throughput. The combination of operations and unconditionally adjustable residence times explain the ultimate performance in terms of cake dryness and wash efficiency. Discontinuous operation also allows the option to discharge a lighter fraction separately during the filling step. Here the basket is basically overfilled and the lighter fraction is preferentially discharged at the basket rim where it can be recycled to the scrubber or discharged separately. Such a decantation of the lighter fraction is particularly beneficial since these compounds (some of them metal hydroxides) tend to form a fairly dense layer on top of the filter that limits subsequent filtration substantially. Measurements showed that the peeler centrifuge does not act as a classifier that would allow for a preferential discharge of the smaller gypsum or unreacted limestone particles through the filling stage. The gypsum particles settle and remain in the basket where they form the cake. But the discontinuous operation mode results in rather low throughput capacity that can only be overcome by numerous parallel machines and therefore high overall costs. Of course, a batch process stage requires tanks upstream and downstream of the machine to fit in an otherwise continuous process. This necessity, although costly, has the advantage of creating a more homogeneous feed to the equipment which also results in better performance.

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Status NEW Posted 30 May 2017 01:05 AM My Price 10.00

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