CROSSFLOW PRECOATING PROCESS AND APPARATUS FOR CARRYING OUT THE PROCESS

摘要

In a crossflow precoating process, a filtrate containing prefilt slurry with, optionally, added filter aids is passed into at least one approximately cylindrical filter chamber through an opening at one end thereof (8). Said filter chamber is formed by the filter basket (5) disposed in a pressure vessel. The filtrate flows through a filter medium delimiting the filter chamber, forming a filter cake, and is discharged as permeate. The filter cake is first formed by the filtrate containing the filter aids in the filter chamber, said filtrate permeating said filter medium. Subsequently, in order to extend the useful life of the filter medium, a partial flow is passed through the filter chamber in approximately axial direction thereof (17) to an opening for retained substances (6) at an end of the filter chamber opposite the first end. The partial flow, one discharged from the opening for retained substances (6), is returned outside the filter chamber to the first opening (8) of the filter chamber.