Abstract: Methods and equipment for preparing a precoat on the surface of a filter medium of a polishing filter. A feature in the invention is that in the polishing filter, the precoat is formed either exclusively or jointly from the underflow created in the separation process.

Abstract: The invention relates to a ceramic filter element (22) for removal of liquid from solids containing material in a capillary suction dryer. The filter element comprises a ceramic substrate covered by a sintered ceramic microporous layer (31). The sintered microporous membrane layer is provided with coarse solid particles (71) of a particle size larger than a pore size of the membrane material layer (31) so as to form a textured surface (50) which prevents a filter cake from sliding off the surface of the filter element prior to the intended cake discharge.

Abstract: Method for preparing a precoat (3) on the surface of the filter medium (2) of a polishing filter (1), polishing filter (1) and use of a polishing filter. The essential feature in the invention is that in the polishing filter (1), the precoat (3) is formed either exclusively or jointly from the underflow created in the separation process.

Abstract: The object of the invention is a liquid extraction filter, more particularly a continuous-action, top-feed, vacuum drum filter. What is essential in the invention is that the filter comprises a drum structure (1) and filter elements (2), the filtration surface of which filter elements is formed of microporous hydrophilic material such that when filtering with a partial vacuum it is impervious to the surrounding air.