| 摘要 |
<p>1. A process for dewatering a pigment filter-cake or a pigment 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, thereby applying surface pressure to the filter-cake or suspension and subsequently causing the filter-cake or suspension to be subjected to variable "line pressures", between one or more pairs of counter-rotating pressure-loaded rollers, the bands comprising a material permeable to the liquid in the filter-cake or suspension, provided that, for each dewatered pigment product, 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 of the pigment in the filter-cake to be watered or in the suspension to be dewatered, the resulting product being obtained in the form of flakes.</p> |
