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A high-gradient magnetic separator is provided for filtrating weakly magnetic particles from a fluid in which they are suspended. The fluid is caused to flow through a separation chamber arranged in a gap in a magnetic circuit which comprises a pair of separate permanent magnetic devices connected b

A high-gradient magnetic separator is provided for filtrating weakly magnetic particles from a fluid in which they are suspended. The fluid is caused to flow through a separation chamber arranged in a gap in a magnetic circuit which comprises a pair of separate permanent magnetic devices connected by means of yoke members of a magnetic soft material. Permanent magnet devices generate a strong magnetic field in the gap with very small magnetic losses. Each permanent magnetic device comprises a permanent magnetic member with a substantially linear demagnetization curve. A matrix of magnetic soft material is disposed in the gap between pole surfaces of the permanent magnetic devices to create high local magnetic gradients. To facilitate cleaning of the matrix filter material, the separation chamber is formed as a displaceable box-shaped cannister. A series arrangement of two such canisters with an intermediate dummy load creates a favorable duty cycle, with one cannister operating in filtration mode and the other displaced outside the gap for cleaning the matrix material. Substantially zero magnetic losses occur with each permanent magnetic device of a pole shoe member being formed of a magnetic soft material, one side forming a pole surface engaging the gap, all other sides being in contact with permanent magnetic members to provide a leakage-free enclosure.

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A magnetic separator for filtrating magnetizable particles from a fluid, in which they are suspended, comprising a separation chamber with a fluid inlet and a fluid outlet, means for causing said fluid to flow through said separation chamber along a predetermined flow path from said fluid inlet to s

A magnetic separator for filtrating magnetizable particles from a fluid, in which they are suspended, comprising a separation chamber with a fluid inlet and a fluid outlet, means for causing said fluid to flow through said separation chamber along a predetermined flow path from said fluid inlet to said fluid outlet, magnetic field generating means disposed adjacent said separation chamber for generating a magnetic field therein with a field direction substantially transverse to at least a portion of said flow path, and a matrix of soft magnetic material disposed in said separation chamber at least in said portion of the flow path to create high local magnetic gradients in said magnetic field, said magnetic field generating means comprising a pair of separate permanent magnetic devices arranged with opposed substantially parallel spaced apart pole surfaces to define a gap for receiving said separation chamber, said permanent magnetic devices being connected in a closed magnetic circuit by means of yoke members of a magnetic soft material, and each of said permanent magnetic devices comprising at least one member of a permanent magnetic material having a substantially linear demagnetization curve, said matrix substantially filling up a part of an interior of said separation chamber extending between a pair of opposed chamber walls extending parallel to said flow path and arranged in magnetic contact with a respective one of said pole surfaces, chamber inlet and outlet compartments being provided between said chamber walls at opposite ends of said matrix-filled part with respect to said flow path to be positioned outside said gap and communicating with said matrix as well as said fluid inlet and said fluid outlet, respectively, to define a main flow direction for said fluid through said matrix, said means for causing said fluid to flow comprising said fluid inlet, said fluid outlet, said pair of adjacent chamber walls and said chamber inlet and outlet compartments, each of said permanent magnetic devices comprising a pole shoe member of a magnetic soft material forming one of said pole surfaces, a first permanent magnetic member arranged in magnetic contact with a side of said pole shoe member opposite said gap and parallel to said pole surface, said first member having a direction of magnetization generally normal to said pole surface, and second magnetic members extending on each side of said pole shoe member mainly transverse to said pole surface and having a direction of magnetization substantially perpendicular to that of said first member, surfaces of said first and second members facing said pole shoe member all having the same magnetic polarity, said first magnetic member being in magnetic contact with said second magnetic members to provide a leakage-free enclosure for said pole shoe member.