Abstract: The apparatus is suitably disposed within a circular tank and comprises a stationary bridge, a feeding bell, a scraper, driving means, and an optional foam scraping means. The apparatus is characterized in that it has a centrally suspended rotating scraper, mounted from a central vertical shaft and driven by a drive which travels along the rim of the tank, and additionally has at least one rotating drive arm. The drive arm is connected at one end to the drive and at its other end to the feeding bell, which is supported by the shaft of the scraper. The feeding bell is preferably capable of vertical adjustment. The scraper is preferably provided with at least one row of a plurality of vertical stick-like members. A foam scraper is optionally attached to the drive arm. The apparatus additionally contains means for automatically raising or lowering the scraper. depending on the relative rotary momentum between the scraper and the rim drive.

Abstract: The invention relates to an equipment for the delivery of slurries and for their refinement during delivery, which has a housing provided with axial inlet opening and tangential discharge opening, furthermore a disc-shaped stationary part in the housing with a concentric opening adjoining the inlet opening, and disc-shaped rotary part arranged opposite the stationary part. Rods are concentrically arranged according to the invention alternately on the stationary part and rotary part in such a way, that the rods of the stationary part point toward the rotary part, and the rods of the rotary part point toward the stationary part, and the rotary part has a jacket surrounding the rods arranged along the largest diameter circle of the stationary part, said jacket being perforated with holes in radial direction.