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US 2003/0146166 A1Published application
Method and apparatus for magnetic separation of particles
AssigneeDexter Magnetic Techologies, Inc.
InventorsChristopher A. Ras, Gareth P. Hatch
Life of this patent
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Abstract
A magnetic circuit is shaped to generate an essentially uniform magnetic field parallel across the length of a container, and an essentially uniform magnetic field gradient along the length of the container as well. The dot product of the magnetic field and magnetic field gradient, known as the relative force density, is substantially uniform over the entire container, thereby causing particles to uniformly separate throughout the container.
Claims21
A magnetic separation apparatus comprising:
- a magnet to generate a substantially uniform north-south magnetic field, the substantially uniform north-south magnetic field oriented substantially parallel with a horizontal cross sectional plane of a container that is proximate the magnet, the substantially uniform north-south magnetic field extending into a part or all of a volume occupied by the container, the substantially uniform north-south magnetic field having a substantially uniform magnetic gradient directed toward a horizontal cross-sectional plane of the magnet to separate magnetically susceptible particles in a fluid contained in the container.
A magnetic separation apparatus comprising:
- an electromagnet to generate a substantially uniform parallel magnetic field;
- a container comprising a plurality of particles and a plurality of magnetically susceptible particles placed in the substantially uniform parallel magnetic field such that the substantially uniform parallel magnetic field is substantially parallel with a transverse cross-section of the container, and extends into the container, to separate the plurality of magnetically susceptible particles from the plurality of particles in the container.
A method for magnetic separation comprising:
- arranging one or more magnets in a plane proximate a container, the one or more magnets to generate a uniform north-south magnetic field oriented parallel with a horizontal cross sectional plane of the container, the uniform north-south magnetic field extending into a volume occupied by the container, the uniform north-south magnetic field having a uniform magnetic gradient directed toward a horizontal cross-sectional plane of the one or more magnets;
- receiving in the container a plurality of particles along with a plurality of magnetically susceptible particles;
- and
- separating the magnetically susceptible particles from the plurality of particles when the one or more magnets apply the north-south magnetic field.
1 more element
Dependencies are inferred from the claim text.