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Ferrofluid Sink Float Separator

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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Searchjspr19740003190 20200604T1641310000z

Searchjspr19740003190 20200604T1641310000z

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

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Nasa Tech Brief

Nasa Tech Brief

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.

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Ferrofluid Sink Float Separator

Ferrofluid Sink Float Separator

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.

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Ferrofluid Sinkfloat Separators For Separating

Ferrofluid Sinkfloat Separators For Separating

Such prior art separators as described above have inherent shortcomings, which are expounded explicitly hereinafter.

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Materials Handling Apparatus For A Ferrofluid Sinkfloat

Materials Handling Apparatus For A Ferrofluid Sinkfloat

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.

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Nasa Tech Brief

Nasa Tech Brief

Ferrofluid Separator for Nonferrous Scrap Separation Ferrofluid sink-float separation is an automated process for separating a mixture of nonferrous scrap metals. This method promises to be a profitable process, based upon test data obtained from a prototype separator, and the successful recovery of ferrofluid from the separated scrap.

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Density Separation Of Solids In Ferrofluids With Magnetic

Density Separation Of Solids In Ferrofluids With Magnetic

Mixtures of solids with a density greater than the apparent density sink while lower density solids float. In practice it is difficult to create a uniform gradient over a large volume and single gap magnetic separators require very large magnets or have a limited throughput.

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A Contribution To The Theory Of Separation In A Rotating

A Contribution To The Theory Of Separation In A Rotating

Jul 01, 1996nbsp018332The scope of the sink-float technique is restricted by a limited range of densities of the separating medium, the upper limit of ferrosilicon medium being approximately 3.5 gcm3 and that of Clerici solution about 4.2 gcm3 at room temperature. ... The general arrangement of forces acting on the particle in the rotating ferrofluid separator is ...

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Us20050178701a1 Method For Magneticferrofluid

Us20050178701a1 Method For Magneticferrofluid

A particulate feed comprising a first particle type and a second particle type is separated by providing a separation apparatus having a separation vessel having a top and a bottom, and wherein the separation vessel includes inwardly sloping side walls. A magnet structure has a first pole positioned exterior of and adjacent to each of the side walls of the separation vessel, and a second pole ...

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Sinkfloat Density Separation Of Postconsumer Plastics

Sinkfloat Density Separation Of Postconsumer Plastics

May 24, 2018nbsp018332Sinkfloat separators may either use gravity or centrifugal force. Centrifugal force devices may display cylindricalconical or cylindrical designs. The cylindricalconical configuration is characteristic of the conventional cyclones, also known as gas cyclones, which are used to sort PCP in various mechanical processing plants.

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Sink Float Tank Hosokawa Polymer Systems

Sink Float Tank Hosokawa Polymer Systems

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.

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The Modelling Of The Separation Process In A

The Modelling Of The Separation Process In A

SINK AND FLOAT SOLIDS SEPARATORS Filed March 5, 1956 3 Sheets-Sheet 1 July 14, 1959 R. TEUTEBERG 2,394,629

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Densimetric Separation Of Coal Using Magnetic

Densimetric Separation Of Coal Using Magnetic

SINK A ND FLOAT SOLIDS SEPARATORS Filed March 5. 1956 3 Sheets-Sheet 2 July 14,1959 R. TEUTEBERG 2,894,629

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Pdf Sinkfloat Density Separation Of Postconsumer

Pdf Sinkfloat Density Separation Of Postconsumer

The heavy liquids used for the separation may be in the form of a liquid such as water, which contains finely divided weighting materials as, for example, pyrite, magnetite and sand. In the working up of coal, for example, the specific gravity should lie between the specific gravity of the coal and that of the rock so that the former floats in the heavy liquid while the rock will sink.

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Modelling Of The Separation Process In A Ferrohydrostatic

Modelling Of The Separation Process In A Ferrohydrostatic

Sink separators of the above process basically consisted of a container such as a conically shaped container into which the heavy liquid and the material to be separated could be introduced and from the upper portion of which the separated float material could be removed and from the lower portion of which the separated sink material could be removed.

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Pdf The Effect Of Magnetic Susceptibility On The Motion

Pdf The Effect Of Magnetic Susceptibility On The Motion

Separation in magnetic fluids is a sink-and-float technique based on the generalised Archimedes law whereby, in addition to the conventional force of gravity, a magnetically induced force acts on ...

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Us2894629a Sink And Float Solids Separators Google

Us2894629a Sink And Float Solids Separators Google

US2894629A US569435A US56943556A US2894629A US 2894629 A US2894629 A US 2894629A US 569435 A US569435 A US 569435A US 56943556 A US56943556 A US 56943556A US 2894629 A US2894629 A US 2894629A Authority US United States Prior art keywords material sink heavy liquid perforated plate heavy Prior art date 1955-03-10 Legal status The legal status is an assumption and

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Density Separation Of Small Particles By Magnetic Fluid

Density Separation Of Small Particles By Magnetic Fluid

1pU v 7 IWc DensitySeparationofSmallParticlesbyMagneticFluid Sink-FloatMethodsATheoreticalStudy RaymondD.MountainandJ.V.Sengers HeatDivision ...

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Hyperbolic Magnet Poles For Sinkfloat Separators Avco

Hyperbolic Magnet Poles For Sinkfloat Separators Avco

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.

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Pdf Modelling Of The Separation Process In A

Pdf Modelling Of The Separation Process In A

It is now more likely than ever that the Australian Coal industry will need to find an alternative to the heavy liquids used to produce a sink-float analysis of coal. Indeed, the Australian Standard on sink-float analysis is likely to be phased out over the next five years. Thus there is a strong motivation to find an alternative method. This report provides a literature review on the use of magnetized ferrofluids for producing a sink-float analysis.

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Application Of Magnetic Fluids For Sinkfloat Analysis

Application Of Magnetic Fluids For Sinkfloat Analysis

A ferrofluid is a colloidal dispersion of 10 nm magnetite particles in a liquid, stabilized by the use of surfactants. When magnetized, and subjected to a magnetic field gradient, the dispersion experiences a powerful downwards force, much like the weight force of a dense liquid. In other words, by adjusting the current supplied to an electromagnet it is possible to produce a fluid of virtually any apparent density.

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Application Of Ferrofluid Density Separation To Particles

Application Of Ferrofluid Density Separation To Particles

This technology is not new, and hence is not protected by patents. However, DeBeers have developed significant know-how, in addition to commercial devices that could be used immediately for sink-float analysis in the coal industry. It would be necessary, however, to investigate the accuracy of the method in the low density range of coal and mineral matter, and hence confirm its suitability. A comprehensive experimental study is therefore recommended in order to examine these issues.

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Modelling Of The Separation Process In A Ferrohydrostatic

Modelling Of The Separation Process In A Ferrohydrostatic

DeBeers would like to secure a buyer for their know-how which is considerable, or at least a licensing arrangement. Unfortunately the sink-float market is not large, and hence the purchase of their know-how is not highly attractive. The technology is not protected by patents, though DeBeers does have some related patents, and details necessary to produce their current range of FHS machines. DeBeers also has significant know-how in the area of kerosene ferrofluid manufacture.

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Sinkfloat Tank For Separation Of Different Types Of

Sinkfloat Tank For Separation Of Different Types Of

DeBeers have indicated they are prepared to provide an FHS machine for a comprehensive trial for the coal industry. Some minor improvements would be introduced, including the use of solid-state pressure transducers to measure and in turn control the density. The sink-float analysis would be conducted in the batch mode using a basket and scoop arrangement.

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