Patent Number: 6,254,781

Title: Method for recycling ferrofluid constituents used in a materials separation process

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.

Inventors: Raj; Kuldip (Merrimack, NH)

Assignee: Ferrofluidics Corporation

International Classification: B03C 1/32 (20060101); B03C 1/00 (20060101); H01F 1/44 (20060101); B01D 035/08 (); C01G 049/08 ()

Expiration Date: 07/03/2018