Journal ArticleDOI
Sink-float separators using permanent magnets and water based magnetic fluid
TLDR
In this paper, the authors describe and discuss the construction of sink-float separators using permanent magnets and provide test results for artificial mixtures of nonferrous metals, including aluminum, copper, zinc and lead.Abstract:
The development of sink-float separators for materials of different densities, which utilize the levitation force of magnetic fluid, have been recently reported. The system usually consists of an electromagnet, separation cell, equipment for recovery of magnetic fluid smeared on the separated products, and controlling system. This paper describes and discusses the construction of sink-float separators using permanent magnets and provides test results for artificial mixtures of nonferrous metals. Ferrite magnet and rare-earth cobalt magnet were used as magnetic field generators in two separators. One for separating aluminum from other nonmagnetic metals, and the other to separate copper, zinc and lead from each other. A series of tests were performed on samples of 6 to 30 mm size, and it was found that the separators operated as expected. The separation of finer metals, however, proved difficult due to the attractive force which acts between nonmagnetic bodies immersed in magnetic fluid in a magnetic field. The chemical process to recover the magnetic fluid from smeared separation products is also proposed.read more
Citations
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Journal ArticleDOI
Synthesis of iron oxide nanoparticles under oxidizing environment and their stabilization in aqueous and non-aqueous media
Dipak Maity,D.C. Agrawal +1 more
TL;DR: In this paper, the particles have been suspended in non-aqueous and aqueous media by coating the particles with a single layer and a bilayer of oleic acid, respectively.
Journal ArticleDOI
Bilayer Surfactant Stabilized Magnetic Fluids: Synthesis and Interactions at Interfaces
TL;DR: Aqueous magnetic fluids were synthesized by a sequential process involving the chemical coprecipitation of Fe(II and Fe(III) salts with ammonium hydroxide (NH4OH) followed by resuspension of the ultrafine particles in water using fatty acids.
Journal ArticleDOI
Magnetite Nanoparticle Dispersions Stabilized with Triblock Copolymers
L. A. Harris,Jonathan D. Goff,A. Y. Carmichael,J. S. Riffle,J. Jonathan Harburn,and T. G. St. Pierre,Martin Saunders +6 more
TL;DR: In this paper, the authors developed complexes of magnetite nanoparticles coated with well-defined hydrophilic polymers so that they could be dispersed in aqueous fluids, and the results showed that these polymers can bind irreversibly to magnetite at the physiological pH.
Journal ArticleDOI
Synthesis of bilayer oleic acid-coated Fe3O4 nanoparticles and their application in pH-responsive Pickering emulsions
TL;DR: Fe(3)O(4) nanoparticles coated with oleic acid bilayer (a diameter about 12 nm) were synthesized and the structure and composition of the particles were analyzed by TEM, FTIR and TGA, showing a distinct two-stage mass loss.
Journal ArticleDOI
Immobilization of albumin on aminosilane modified superparamagnetic magnetite nanoparticles and its characterization
TL;DR: The influence of three different buffer solutions on covalent immobilization was studied and phosphate buffer saline solution (PBS) was shown the highest binding ability for immobilization process compared to other buffer solutions.
References
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Journal ArticleDOI
Buoyancy and Stable Levitation of a Magnetic Body immersed in a Magnetizable Fluid
TL;DR: In this article, the nature of the peculiar forces experienced by a body immersed in magnetic fluid when the body is a source of magnetic field is discussed and prediction and experimental demonstration are given of the stable "fluidmagnetic" levitation of a permanent magnet at an interior region of the fluid.
Journal ArticleDOI
Reversible, field induced agglomeration in magnetic colloids☆
TL;DR: In this article, a sensitive Colpitts oscillator circuit monitored the spatial and temporal variations in magnetization in a vertical 11 cm column of magnetic fluid, and the results are consistent with the hypothesis that spherical agglomerates of 10 7 -10 9 particles are formed and settle gravitationally.
Journal ArticleDOI
Separating Nonferrous Metals in Incinerator Residue Using Magnetic Fluids
S. E. Khalafalla,G. W. Reimers +1 more
TL;DR: A magnetogravimetric separation method has been adopted to fractionate nonferrous metals from the residue of incinerated urban refuse as mentioned in this paper, where a colloidal solution of magnetite in kerosene between the poles of a magnet was used to separate particles according to their density spectrum in a continuous fashion.
Journal ArticleDOI
Theory of large agglomerates in magnetic colloids
Wei-Hsi Liao,David A. Krueger +1 more
TL;DR: In this paper, the authors investigate the size, shape, and settling velocities of the agglomerates as a function of applied magnetic field and propose a theory based on the minimization of the energy, magnetic plus surface tension, and the marginal stability of the trailing particle.
Proceedings ArticleDOI
Recovery of nonferrous metals from scrap automobiles by magnetic fluid levitation.
L. Mir,C. Simard,D. Grana +2 more
TL;DR: Ferrofluids are colloidal dispersions of subdomain magnetic solids in carrier liquids as discussed by the authors, which exert a pressure on immersed nonmagnetic objects in the opposite sense of the field gradient, when opposite to gravity, levitate objects of higher density than the ferrofluid.