Method for pressure filtering and device for carrying out same

A pressure filter comprising a frame, pressure plates, means to press the plates against each other, means for separating from each other in pairs to form at least one pressure chamber capable of being closed and opened, and two substantially planar vertical filter cloths for forming filter cakes between the cloths in said chamber, suspension means suspending said cloths, movable in a horizontal direction on guide rails, and vibrating means to subject the suspension means to a mechanical agitation when the chamber is opened in order to loosen the filter cakes from the filter cloths said pressure filter including additional means to subject the filter cloths and the filter cakes to shearing forces.

A method of using a pressure filter having pressure plates in pairs forming at least one pressure chamber in which two substantially vertical filter cloths are carried by suspension rods movable in a horizontal direction on movably supported guide rails and means to feed a suspension of solid particle sin a liquid under pressure into the pressure chamber and force the liquid through the filter cloths, means for discharging filtered liquid from said chamber, the solid particles remaining between the filter cloths forming a filter cake, including the steps of taking apart the pressure plates and mechanically agitating the suspension means to loosen the filter cakes from the filter cloths including the additional step of

• subjecting the cloths to sudden acceleration forces by lifting the guide rails which carry the filter cloths and dropping the rails against stationary stops.

A pressure filter having a frame, pressure plates, means to press the plates against each other, means for separating the plates from each other in pairs to form at least one pressure chamber capable of being closed and opened, and two substantially vertical filter cloths for forming filter cakes between the cloths in each chamber, said cloths suspended from suspension means movable in a horizontal direction on guide rails, and vibrating means to subject the suspension means to a mechanical agitation when the chamber is opened in order to loosen the filter cakes from the filter cloths, said pressure filter including further means to subject the filter cloths and the filter cakes to sudden acceleration forces.