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Magnetic process for removing heavy metals from water employing magnetites

United States Patent

July 22, 2003
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
A process for removing heavy metals from water is provided. The process includes the steps of introducing magnetite to a quantity of water containing heavy metal. The magnetite is mixed with the water such that at least a portion of, and preferably the majority of, the heavy metal in the water is bound to the magnetite. Once this occurs the magnetite and absorbed metal is removed from the water by application of a magnetic field. In most applications the process is achieved by flowing the water through a solid magnetized matrix, such as steel wool, such that the magnetite magnetically binds to the solid matrix. The magnetized matrix preferably has remnant magnetism, but may also be subject to an externally applied magnetic field. Once the magnetite and associated heavy metal is bound to the matrix, it can be removed and disposed of, such as by reverse water or air and water flow through the matrix. The magnetite may be formed in-situ by the addition of the necessary quantities of Fe(II) and Fe(III) ions, or pre-formed magnetite may be added, or a combination of seed and in-situ formation may be used. The invention also relates to an apparatus for performing the removal of heavy metals from water using the process outlined above.
Prenger; F. Coyne (Los Alamos, NM), Hill; Dallas D. (Los Alamos, NM), Padilla; Dennis D. (Los Alamos, NM), Wingo; Robert M. (Los Alamos, NM), Worl; Laura A. (Los Alamos, NM), Johnson; Michael D. (Las Cruces, NM)
The Regents of the University of California (Oakland, CA)
09/ 776,608
February 2, 2001
GOVERNMENT RIGHTS This invention was made with Government support Contract Number W-7405-ENG-36 awarded by the United States Department of Energy to the Regents of the University of California. The Government has certain rights in the invention.