Liquid purification or separation – Processes – Using magnetic force
Reexamination Certificate
2007-08-28
2007-08-28
Hruskoci, Peter A. (Department: 1724)
Liquid purification or separation
Processes
Using magnetic force
C210S719000, C210S724000, C210S726000, C210S912000, C423S055000, C423S061000
Reexamination Certificate
active
10873598
ABSTRACT:
A method and system for decreasing the concentration of at least one metal in an aqueous solution. The metal may be molybdenum, tungsten, or both. An aqueous solution is introduced into at least one reaction zone, and at least one source of hydroxide ions is provided into the at least one reaction zone in an amount sufficient to precipitate at least some of the mass of the at least one metal. The aqueous solution includes a mass of the at least one metal and a mass of at least one reducing agent. The at least one reducing agent includes at least ferrous iron from at least one source of the at least one reducing agent. A composition of tungsten ferrite or molybdenum tungsten ferrite may be formed. The method may be used for purifying water, for the refining of metals, or to facilitate a chemical analytical determination.
REFERENCES:
patent: 3553126 (1971-01-01), Oberhofer
patent: 4211753 (1980-07-01), Pemsler et al.
patent: 4222872 (1980-09-01), Ramirez
patent: 5330658 (1994-07-01), Grant et al.
patent: 5976383 (1999-11-01), Guess et al.
patent: 6177015 (2001-01-01), Blakey et al.
patent: 6322701 (2001-11-01), Delighiannis
patent: 6428705 (2002-08-01), Allen et al.
Dannenberg, A.E., A.E. Petersen, P.B. Altringer, P.T. Brooks, “Molybdenum Removal from Concentrator Waste Water”, U.S. Bureau of Mines, Report 8686, 1992.
LeGendre, G.R., D.D. Runnells “Removal of Dissolved Molybdenum from Wastwaters by Precipitates of Ferric Ion”, Environmental Science and Technology, 9, 1975, pp. 744-749.
Beckstead, L.W. et al., “Precipitation of Molybdenum Sulfide from Aqueous Solution”, Journal of Metals, Jul. 1985.
Heininger, M.W., C.E. Meloan, “A Selective Reagent for the Removal and Recovery of Chromate, Molybdate, Tungstate, and Vanadate from Aqueous Solution”, Separation Science and Technology, 27, 1992, pp. 663-669.
Wing R.E., W.E. Rayford, W.M. Doane, C.R. Russel, “Preparation of Insoluble Cationic Starches and their Use in Heavy Metal Anion Removal”, Journal of Applied Polymer Science, 22, 1978, pp. 1405-1416.
Zhao, Y., A.I. Zouboulis, K.A. Matis, “Removal of Molybdate and Arsenate from Aqueous Solutions by Flotation”, Separation Science and Technology, 31, 1996, pp. 769-785.
Morrison, S.J., R.R. Spangler, “Extraction of Uranium and Molybdenum from Aqueous Solutions: A Survey of Industrial Materials for Use in Chemical Barriers for Uranium Mill Tailings Remediation” , Environmental Science and Technology, 26, 1992, pp. 1922-1931.
Blakey Brian Charles
Bracco Angelo Anthony
Kim Bang Mo
Rawson James Rulon Young
Hruskoci Peter A.
McClintic Shawn A.
Powell, III William E.
LandOfFree
Method for decreasing a concentration of metal in aqueous... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for decreasing a concentration of metal in aqueous..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for decreasing a concentration of metal in aqueous... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3834270