METHOD AND APPARATUS FOR DISPLACING LIQUOR FROM A SLURRY OF PARTICULATE SOLID MATERIAL

摘要

A slurry is subjected to a filtration and washing process in order to separatethe liquor from the solids. The filtration and washingprocess is carried out in a housing (101) enclosing an inert gaseousatmosphere which also passes through the filter cake and may be recycled,after treatment, to remove contaminants therefrom. To prevent recontaminationof the filter cake as a result of the recycled gas entisiningcontaminant vapours within the housing (101), the gas is introduced into thehousing (101) at a downstream location (152a, 166) relativeto the direction of travel of the filter cake on a movable filter medium (100)and in such a way as to develop a contaminant-concentrationgradient whereby the cleanest cake is contacted by gas having the lowestcontaminant level.