Vacuum filter, horizontal performance

The only types of filters that are suitable for phosphoric acid production (that can perform the sequence of all operations desired in the process of filtering gypsum) are the horizontal belt vacuum filters, which are offered by companies such as Fimco, Delkor, and Pannews the Bird tilting-pan vacuum filters, offered by Bird and Profile, ind the UCEGO rotating-table vacuum filters, offered by Rhone-Poulenc. 

Hydrocyclones are also used as classifiers simply to improve the performance of other filtration or separation equipment. A good example is in applications where the cyclone separates the feed into coarse and fine particles, and the coarse material is fed onto the horizontal belt filter first, as a precoat, with fines to follow (see Figure 6.25). This will, if the cut point of the cyclone is set correctly, give good filtrate clarity and extend the usefulness of vacuum filters to finer feeds without necessarily adversely affecting the moisture content of the cake. 

Svarovsky, L. and Walker, A. J., The effect of feed thickening on the performance of a horizontal vacuum belt filter , 1st World Congress Particle Technology, 331 Event of EFCE, Part IV, NMA mbH, Nuemhurg (1986)... 

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