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Primary Examiner: Lutter, Frank W.
Assistant Examiner: Hill, Ralph J.
Attorney: Ogman; Abraham

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Title: Materials handling apparatus for a ferrofluid sink/float separator

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Claims: I claim:

1. A ferrofluid sink/float separator with access means into and out of the ferrofluid comprising:

a. means for supplying a magnetic field capable of supporting an unconstrained column of ferrofluid within the magnetic field, said magnetic field further having defined therein a predetermined volume of space, the top of said volume is positioned in the magnetic field above where the top of the unconstrained column would occur, and

b. a partially closed container defined by a bottom closure and side walls containing ferrofluid filling said predetermined volume of space and further containing ferrofluid-air interfaces, the location of which are defined by the relationship:

    ______________________________________
     ##STR2##
    where:
    H.sub.z(lower)
               = the magnetic field intensity at the
               lower edge of the ferrofluid-air
               interface,
    H.sub.z(upper)
               = the magnetic field intensity at the
               top surface of the ferrofluid
    M          = the ferrofluid magnetization,
    dH         = the incremental change of the mag-
               netic field intensity within the
               ferrofluid,
    .rho.      = the density of the ferrofluid,
    g          = acceleration of gravity, and
    Z          = the vertical distance of any point
               on the interface below the top sur-
               face of the ferrofluid.
    ______________________________________

c. an access opening in a side wall to expose an interface, the marginal edge of the access opening being no closer to the column of ferrofluid than intercepting the interface.

2. A ferrofluid separator means as provided in claim 1 where a fringe portion of the magnetic field extends out, laterally, from between a pair of pole pieces and said interface is positioned in said fringe portion.

3. a ferrofluid separator means as provided in claim 1 where said predetermined volume is a volume wherein the gradient of the magnetic field intensity is constant.

4. a ferrofluid separator means as provided in claim 1 where said lower edge of the lowermost interface is at or near H = O.

5. A ferrofluid sink/float separator with access means into and out of the ferrofluid comprising:

a. means for supplying a magnetic field capable of supporting an unconstrained column of ferrofluid within the magnetic field, said magnetic field further having defined therein a predetermined volume of space, the top of said volume is positioned in the magnetic field above where the top of the unconstrained column would occur, and

b. partially closed container defined by a bottom closure and side walls containing ferrofluid filling said predetermined volume of space, and containing ferrofluid-air interfaces; the location of said interfaces being defined by the relationship:

    ______________________________________
     ##STR3##
    where:
    H.sub.z(lower)
               = the magnetic field intensity at the
               lower edge of the ferrofluid-air
               interface,
    H.sub.z(upper)
               = the magnetic field intensity at the
               top surface of the ferrofluid
    M          = the ferrofluid magnetization,
    dH         = the incremental change of the mag-
               netic field intensity within the
               ferrofluid,
    .rho.      = the density of the ferrofluid,
    g          = acceleration of gravity, and
    Z          = the vertical distance of any point
               on the interface below the top sur-
               face of the ferrofluid.
    ______________________________________

c. a lower access opening in the side walls for removing sinks and a middle opening for feeding stock to the separator, the respective marginal edges of said openings being no closer to the column of ferrofluid than intercepting an interface.

6. A materials handling apparatus as defined in claim 5 wherein the magnetic field includes a volume wherein the gradient of magnetic field intensity is constant and said ferrofluid fills said volume.

7. A a ferrofluid separator as defined in claim 5 wherein said magnetic field includes a laterally extending fringe portion and said openings are defined in the fringe portion.
Other info:

Inventors: Mir, Leon (Brookline, MA, US)

Application Number: 365066
Filing Date: 1973-05-30
Publication_date: 1977-10-04
Assignee: Avco Corporation (Wilmington, MA)
Primary Class(es): 209/1 209/172.5
Other Classes:
US Patent Ref:

2209618	Jul, 1940	Vogel	209/172.
2902153	Sep, 1959	Green	209/208.
3460672	Aug, 1969	Imris	209/1.
3483968	Dec, 1969	Kaiser	209/1.
3483969	Dec, 1969	Rosenweig	209/1.
3488531	Jan, 1970	Rosenweig	310/10.
3788465	Jan, 1974	Reimers et al.	209/1.

Other Refs: Other References: Rosenweig, R. E., "Magnetic Fluids", International Science and Technology, pp. 48-54 & 56, July 1966.