A/s Niro Atomizer

Orla Christensen

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.

High-gradient magnetic separator

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 formed between a pair of opposed pole surfaces of a pair of separate permanent magnetic devices connected with a closed magnetic circuit which includes yoke members. The permanent magnetic devices generate a strong magnetic field in the gap, the magnetic field having a field direction substantially transverse to at least a portion of the flow path of the fluid through the separation chamber. The permanent magnetic devices each include at least one permanent magnetic member having a substantially linear demagnetization curve. A matrix of soft magnetic material is located in the separation chamber to create local magnetic gradients in the magnetic field. The matrix includes strands extending in planes substantially transverse to the magnetic field direction. A major portion of the matrix strands have an orientation transverse to the magnetic field direction and to the main flow direction of the fluid.

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Copenhagen, Denmark

Orla Christensen