Rare earth-transition metal scrap treatment method

Title: Rare earth-transition metal scrap treatment method

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Abstract

Rare earth-transition metal (e.g. iron) scrap (e.g. Nd-Fe-B scrap) is melted to reduce the levels of tramp oxygen and nitrogen impurities therein. The tramp impurities are reduced in the melt by virtue of the reaction of the tramp impurities and the rare earth to form dross on the melt. The purified melt is separated from the dross for reuse. The oxygen and nitrogen of the melt are reduced to levels acceptable for reuse of the treated alloy in the manufacture of end-use articles, such as permanent magnets.

Inventors:

Schmidt, Frederick A ^[1]; Peterson, David T ^[1]; Wheelock, John T ^[2]; Jones, Lawrence L ^[3]; Lincoln, Lanny P ^[4]

Ames, IA
Nevada, IA
Des Moines, IA
Woodward, IA

Issue Date:: 1992-02-11

Research Org.:: Ames Lab., Ames, IA (United States); Iowa State University, Ames, IA (US)

OSTI Identifier:: 868167

Patent Number(s):: 5087291

Application Number:: 07/591,046

Assignee:: Iowa State University Research Foundation, Inc. (Ames, IA)

DOE Contract Number:: W-7405-ENG-82

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: rare; earth-transition; metal; scrap; treatment; method; iron; nd-fe-b; melted; reduce; levels; tramp; oxygen; nitrogen; impurities; therein; reduced; melt; virtue; reaction; earth; form; dross; purified; separated; reuse; acceptable; treated; alloy; manufacture; end-use; articles; permanent; magnets; treatment method; permanent magnet; transition metal; rare earth; permanent magnets; earth-transition metal; rare earth-transition; metal scrap; tramp impurities; nd-fe-b scrap; nitrogen impurities; /75/

Citation Formats


                    Schmidt, Frederick A, Peterson, David T, Wheelock, John T, Jones, Lawrence L, and Lincoln, Lanny P. Rare earth-transition metal scrap treatment method.  United States: N. p., 1992. 
        Web.

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                    Schmidt, Frederick A, Peterson, David T, Wheelock, John T, Jones, Lawrence L, & Lincoln, Lanny P. Rare earth-transition metal scrap treatment method.  United States.

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                    Schmidt, Frederick A, Peterson, David T, Wheelock, John T, Jones, Lawrence L, and Lincoln, Lanny P. Tue .  
        "Rare earth-transition metal scrap treatment method".  United States.  https://www.osti.gov/servlets/purl/868167.

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@article{osti_868167,

  title        = {Rare earth-transition metal scrap treatment method},

  author       = {Schmidt, Frederick A and Peterson, David T and Wheelock, John T and Jones, Lawrence L and Lincoln, Lanny P},

  abstractNote = {Rare earth-transition metal (e.g. iron) scrap (e.g. Nd-Fe-B scrap) is melted to reduce the levels of tramp oxygen and nitrogen impurities therein. The tramp impurities are reduced in the melt by virtue of the reaction of the tramp impurities and the rare earth to form dross on the melt. The purified melt is separated from the dross for reuse. The oxygen and nitrogen of the melt are reduced to levels acceptable for reuse of the treated alloy in the manufacture of end-use articles, such as permanent magnets.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1992},

  month        = {2}

}

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