Classifying – separating – and assorting solids – Magnetic – Paramagnetic
Patent
1982-08-30
1988-09-20
Prunner, Kathleen J.
Classifying, separating, and assorting solids
Magnetic
Paramagnetic
210222, B03C 100
Patent
active
047723831
ABSTRACT:
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.
REFERENCES:
patent: 1317992 (1919-10-01), Sekinger
patent: 3567026 (1971-03-01), Kolm
patent: 3627678 (1971-12-01), Marston et al.
patent: 3770629 (1973-11-01), Nolan
patent: 4054513 (1977-10-01), Windle
The Condensed Chemical Dictionary, 10th Ed., New York, Reinhold, 1981, p. 456.
Chemical Engineers' Handbook, 5th Ed., New York, McGraw-Hill, 1973, pp. 21-62.
IEEE Transactions on Magnetics, vol. MAG-17, No. 6, Nov. 1981, pp. 3299-3301, New York, USA; P. W. Riley et al: "A Reciprocating Canister Superconducting Magnetic Separator".
A/S Niro Atomizer
Prunner Kathleen J.
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