A magnetic separator that can, even in the case where a powdery and/or granular material containing ferromagnetic particles is processed in a large amount or the layer of the supplied powdery and/or granular material is thick, efficiently separate the ferromagnetic particles from the powdery and/or granular material by magnetic separation at low cost without requiring complex processes or liquid waste disposal and also can resolve the adhesion of ferromagnetic particles which is a problem specific to a magnetic separator of belt conveyor type is provided. A magnetic separator comprises: at least one pair of guide rolls; and a conveyor belt that extends between the pair of guide rolls, and conveys a powdery and/or granular material containing ferromagnetic particles, wherein one guide roll of the pair of guide rolls is a hollow roll, and includes, in a hollow part thereof, a magnet roll including a plurality of magnets that are arranged along an inner peripheral surface of the guide roll in lines at intervals so that different magnetic poles alternate in a circumferential direction, and the magnetic separator further comprises a shield wall that covers a circular arc region of an outer peripheral surface of the guide roll except a circular arc region around which the conveyor belt is wound, to block magnetic lines of force from the plurality of magnets.
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