Modelling of the Separation Process in a Ferrohydrostatic ...

The model is replacing the ferrofluid by imposing a drag force on the particle. ... K. Nakatsuka, T. Fujita, and A. Kounosu, "Sink-float separators using permanent magnets and water based magnetic fluid ... "An improved sink-float testing apparatus for coal preparation using water based magnetic fluid," in Proceedings of the 11th ...

US3483968A - Method of separating materials of different ...

DEFINITIONS For the purposes of this discussion, a ferrofluid is defined as a material comprising a permanent colloidal suspension of ferromagnetic particles in …

Sink and Float Separation Process

The Sink and Float separator at Bunker Hill receives about 70 percent of the mine ore of sizes ranging from 1¼-inch to 1/8-inch. It rejects as unneconomic coarse waste about 50 percent of the separator feed, or in other words, about 35 percent of the whole mine output. The remaining 65 percent of the mine ore, made up of 30 percent fines and ...

The rise of ferrofluids | Feature | Chemistry World

This magnet attracts the ferrofluid, setting up a density gradient within the liquid and repelling the non-magnetic flakes. 'So inside the fluid, it's not a simple sink/float [scenario],' explains Utrecht University's Ben Erné, a physical chemist who tests ferrofluids for MDS. 'Different materials of different densities will float at ...

Sink-float ferrofluid separator applicable to full scale ...

The scrap separator uses an electromagnet to generate a region of constant density within a pool of ferrofluid held between the magnetic poles; a saturated kerosene base ferrofluid as able to float all common industrial metals of interest. Conveyors move the scrap into the ferrofluid for separation according to density.

Haith Group 750 Sink - Float Separator - YouTube

Haith Sink - Float Separator for fast and effective separation of waste material.

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. To overcome that problem, multiple gap magnetic grids have been designed.

Sink-float ferrofluid separator applicable to full scale ...

Sink-float ferrofluid separator applicable to full scale nonferrous scrap separation Design and performance of a ferrofluid levitation separator for recovering nonferrous metals from shredded automobiles are reported. The scrap separator uses an electromagnet to generate a region of constant density within a pool of ferrofluid held between the magnetic poles; a saturated …

US3483968A - Method of separating materials of different ...

Materials handling apparatus for a ferrofluid sink/float separator US4062765A (en) * : : Union Carbide Corporation: Apparatus and process for the separation of particles of different density with magnetic fluids US4085037A (en) * : : Union Carbide Corporation

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.

Sink and Float Separation Process

The Sink and Float Process reduces medium currents to a minimum with the following benefits: Prevents interference with accuracy of separation by classifying effects. Reduces the fine size limit at which ore can be separated. Increases the recovery of particles of marginal density. SIZE OF ORE FEEDING A SINK & FLOAT SEPARATOR

Wide-range density separation of mineral particles in a ...

and contain the ferrofluid and sample. A central slid-ing valve in the cell isolates sink and float portions of separated samples. By varying the magnetic field gradient applied to a ferrofluid, it is possible to selec-tively sink or float a nonmagnetic solid object con-tained in the ferrofluid. The ferrofluid force, F^, on the object tends to

NASA CR-132318 SINK-FLOAT FERROFLUID SEPARATOR

SINK-FLOAT FERROFLUID SEPARATOR APPLICABLE TO FULL SCALE NONFERROUS SCRAP SEPARATION Contract No. NAS 1-11793 Prepared for National Aeronautics and Space Administration Langley Research Center Langley Station Hampton, Virginia 23365 Prepared by Avco Systems Division Lowell Industrial Park Lowell, Massachusetts 01851 /

Ferrofluid sink/float separators for separating ...

A ferrofluid sink/float separator embodied in the present invention is shown in FIG. 2, which comprises a horizontal separating tank 20 made of a nonmagnetic material, an electromagnet 10 having two magnetic poles N and S, a first transporting mechanism 30, a material discharging trough 50 made of a nonmagnetic material, and a second ...

Materials handling apparatus for a ferrofluid sink/float ...

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 ...

US4113608A - Apparatus for separating non-magnetic ...

Ferrofluid sink/float separators for separating nonmagnetic materials of different densities US6213308B1 (en) : : Recot, Inc. System for debris elimination and item separation and method of use thereof US6293407B1 (en) : : Recot, Inc.

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.

The rise of ferrofluids | Feature | Chemistry World

This magnet attracts the ferrofluid, setting up a density gradient within the liquid and repelling the non-magnetic flakes. 'So inside the fluid, it's not a simple sink/float [scenario],' explains ...