The present invention relates to a device for separating selectively the nonmagnetic materials of different densities by means of the ferrofluid.
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The floatation force acting on a nonmagnetic body induced by the magnetic field gradient existing in the ferrofluid can be expressed in terms of an equation of.
In view of the neutral buoyancy, the apparent density p of the ferrofluid is equal to the density s of the particle. It can be therefore concluded that the density of the ferrofluid can be altered by adjusting the magnetic field acting on the ferrofluid. For this reason, the ferrofluid sinkfloat separation of nonmagnetic materials of different densities is possible.
Similar separators were subsequently and respectively disclosed by Leon Mir in the U.S. Pat. No. 4,052,297 Saburo Kazama, et al. in the U.S. Pat. No. 4,113,608 and J. Shimoiizaka, et al. in IEEE Transactions on Magnetics, vol. Mag-16, No. 2, March 1980.
Such prior art separators as described above have inherent shortcomings, which are expounded explicitly hereinafter.
The prior art separators are not cost-effective in view of the fact that they must be provided with two magnetic poles of a considerable size so as to allow a large amount of the separated nonmagnetic materials to deposit in the separating area located between the two magnetic poles.
Dec. 16, 1969 METHOD OF SEPARATING MATERIALS OF DIFFERENT DENSITY Filed June 12, 19s R. KAISER 3,483,968.
Materials handling apparatus for a ferrofluid sinkfloat separator US4062765A en 1975-12-29 1977-12-13 Union Carbide Corporation Apparatus and process for the separation of particles of different density with magnetic fluids US4085037A en 1975-12-29 1978-04-18 Union Carbide Corporation.
ATTORNEYS R. KAISER Dec. 16, 1969 METHOD OF SEPARATING MATERIALS OF DIFFERENT DENSITY Filed June 12, 1967 2 Sheets-Sheet 2 zwmo JA E ommO a JA E QMmOJO JA E ROBERT KAISER INVENTOR.
ATTORNEYS 6 wumaowdz United States Patent US. Cl. 209-1 7 Claims ABSTRACT OF TI-IE DISCLOSURE Method of separating materials of different density by passing a controlled magnetic field through a ferrofluid and introducing the materials into the ferrofluid.
The use of a sink float separation tank is especially useful in the recycling PPPE films and PET bottles. In the case of PPPE films, PPPE films have a density of around .93 gcm3 which makes it float while various contaminants such as dirt, rocks, metals, and glass will sink to the bottom where it is collected to removed via a conveyor system.
BACKGROUND OF THE iNVENTION In general, this invention is directed to a process of separating materials of different density and more particularly to accomplishing this objective through the use of magnetic fields and ferrofiuids.
OBJECTS It is an object of the invention to provide a novel method of separating materials according to differences in density.
It is another object of the invention to provide a method of separating materials of different density using the interaction of magnetic fields and ferrofiuids.
It is yet another object of the invention to achieve separation of materials of different density by differential levitation whereby materials of different density occur in different elevational strata.
It is still another object of the invention to achieve separation of materials by sequential levitation whereby materials of different density are levitated in sequence in accordance with their respective densities.
1pU v 7 IWc DensitySeparationofSmallParticlesbyMagneticFluid Sink-FloatMethodsATheoreticalStudy RaymondD.MountainandJ.V.Sengers HeatDivision.
A technique for the recovery of ferrofluids has been developed and low-cost ferrofluids are being manufactured on a production scale. Technology for accurate, environmentally friendly hands-off densimetric analysis of coal by is thus available 1. INTRODUCTION Separation in magnetic fluids is a sinkfloat technique of density separation, which.
Our Sink Float Tank is used to separate different materials based on their different specific weights. This is accomplished by feeding mixed materials into the tank, which is filled water. There are paddle rollers for pressing the materials down into water, mixing the materials fully with water and also moving this mix forward at a slow speed.
Aug 05, 1975nbsp018332The non-magnetic sink-float separator of the present invention is based on an unusual property of ferrofluids- the ability to float a non-magnetic or weakly magnetic object of far greater density than the ferrofluid itself when the ferrofluid is placed in a suitable magnetic field.
Separation iron ore milling. Sink Float Separation Process In Ore Dressing Company Of Making Concentration And Separation Equipment Electrostatic Separation Of.
Flotation ore dressing which involves separating substances by whether they sink or float. batch flotation separation process has been.
Cargille Labs Services to the identification and separation work. The most precise Sink-Floats, Sink-Float Sets The precise density of a Sink Float Standard.
The separation of the alumina from the impurities in the bauxite ore is usually Extraction Process of Aluminium Sink and Float Separation Process.
The separation of polyethylene terephthalate PET water while PE and PP float during a sinkfloat process. Aspects of ore Treatment and.
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