Abstract: Endless belt conveyor in which the belt is stretched between two pulleys or drums one of which is a drive pulley provided, at least at one of its ends, with belt guiding devices consisting of a circular row of studs fitting into holes punched on the belt edge. To make is possible to use holes-and-studs guiding devices on a thin belt without any risk of the belt tearing, the studs are fastened on a ring mounted on the drive pulley shaft, coaxially therewith, so as to rotate on the shaft.

Abstract: A high-intensity magnetic separator operating in a wet environment for separating magnetic particles from a fluid material comprises a separating unit which comprises a vertically extending housing having side walls defining a separating chamber, valved ducts for alternately circulating the fluid material and a washing liquid vertically downwardly through the separating chamber, and permanent magnets arranged adjacent the side walls of the housing for generating therebetween a magnetic field extending perpendicularly to the direction of circulation of the fluid material in the separating chamber.

Abstract: A high-intensity magnetic separator for separating paramagnetic particles from non-magnetic particles comprises a rotor including a shaft and a stack of alternating ring-shaped pole pieces and permanent magnets arranged on the shaft, the pole pieces and the permanent magnets having substantially equal diameters. To increase the service life of the rotor without noticeably reducing its performance, the permanent magnet is peripherally covered by a layer of ceramic material having a thickness of less than 50 .mu.m.