System for recycling ferrofluid constituents used in a materials

Details System for recycling ferrofluid constituents used in a materials System for recycling ferrofluid constituents used in a materials

1998-10-22

2000-08-15

Reifsnyder, David A.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

210121, 210177, 210178, 2101981, 210219, 210223, 210295, 210301, 134 12, 134 2214, 202152, 252 6251R, 252 6256, B01D 3506, B01D 2126, B01D 3700, C01G 4908

Patent

active

061031070

ABSTRACT:
Ferrofluid coated particles resulting from a ferrofluid materials separation process are washed with a solvent which is the same material as the liquid carrier employed in the ferrofluid. The result is a "dirty" solvent which is a very weak ferrofluid. The dirty solvent is then filtered or centrifuged to remove dust particles and other impurities and then the solvent is recovered by distillation in a distillation unit. The solvent can then be reused in the materials reclamation process. The residue in the distillation unit is surfactant-coated particles of ferrofluid. This residue is mixed with either clean or unprocessed solvent in the right proportion and the slurry is passed through an attritor to convert it to a high grade ferrofluid. The ferrofluid can also be reused in the materials separation process.

REFERENCES:
patent: 3483969 (1969-12-01), Rosensweig
patent: 4435302 (1984-03-01), Reimers et al.
patent: 5240628 (1993-08-01), Kanno et al.
Khalafala, S.E. and Reimers, G.W., "Magneto-Gravimetric Separation of Nonmagnetic Solids", Society of Mining Engineers, AIME 198 Transactions, v. 254, Jun. 1973, pp. 193-.
Fujita, T., "Separation of Nonmagnetic Particles with Magnetic Fluid", reprinted in Magnetic Fluids and Applications Handbook, edited by B. Berkovski, Begell House, Inc. New York, (1996).
Farkas, J., et al., "Recovery and Reconstitution of Ferromagnetic Fluids", Separation Science and Technology, 1983, pp. 917-939.

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