De-watering process

Details De-watering process De-watering process

B - Operations, Transporting

30

B

100/9

B30B 9/20 (2006.01) B30B 9/24 (2006.01)

Patent

CA 1240199

ABSTRACT OF THE DISCLOSURE. De-watering Process A process for de-watering a pigment filter-cake or suspension comprising feeding the filter-cake or suspension into the nip between two counter- rotating endless bands moving under tension around one or more rollers, preferably two or more rollers, thereby applying surface pressure to the filter-cake or suspension, and subsequently causing the filter- cake to be subjected to variable line pressure between one or more pairs of counter-rotating pressure-loaded rollers; the bands com- prising a material permeable to the liquid in the filter-cake or sus- pension, provided that, for each dewatered pigment product, the condi- tions of surface pressure,line pressure and band speed are so chosen that the final water content of the product is not more than 10 % greater than the critical moisture content (as hereinbefore defined) of the pigment in the filter-cake or suspension to be dewatered.

433558

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