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Title: Method for treating rare earth-transition metal scrap

Abstract

Rare earth-transition metal (e.g., iron) scrap (e.g., Nd-Fe-B scrap) is flux (slag) remelted to reduce tramp non-metallic impurities, such as oxygen and nitrogen, and metallic impurities, such as Li, Na, Al, etc., picked up by the scrap from previous fabrication operations. The tramp impurities are reduced to concentrations acceptable for reuse of the treated alloy in the manufacture of end-use articles, such as permanent magnets. The scrap is electroslag or inductoslag melted using a prefused, rare earth fluoride-bearing flux of CaF.sub.2, CaCl.sub.2 or mixtures thereof or the slag resulting from practice of the thermite reduction process to make a rare earth-iron alloy.

Inventors:
 [1];  [1];  [2];  [3]
  1. (Ames, IA)
  2. (Nevada, IA)
  3. (Des Moines, IA)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
OSTI Identifier:
868613
Patent Number(s):
US 5174811
Application Number:
07/591,040
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA) AMES
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; treating; rare; earth-transition; metal; scrap; iron; nd-fe-b; flux; slag; remelted; reduce; tramp; non-metallic; impurities; oxygen; nitrogen; metallic; na; etc; picked; previous; fabrication; operations; reduced; concentrations; acceptable; reuse; treated; alloy; manufacture; end-use; articles; permanent; magnets; electroslag; inductoslag; melted; prefused; earth; fluoride-bearing; caf; cacl; mixtures; resulting; practice; thermite; reduction; process; earth-iron; metallic impurities; rare earth-iron; permanent magnet; transition metal; rare earth; permanent magnets; reduction process; earth-transition metal; rare earth-transition; thermite reduction; metal scrap; earth-iron alloy; tramp impurities; nd-fe-b scrap; treating rare; iron alloy; /75/

Citation Formats

Schmidt, Frederick A., Peterson, David T., Wheelock, John T., and Jones, Lawrence L. Method for treating rare earth-transition metal scrap. United States: N. p., 1992. Web.
Schmidt, Frederick A., Peterson, David T., Wheelock, John T., & Jones, Lawrence L. Method for treating rare earth-transition metal scrap. United States.
Schmidt, Frederick A., Peterson, David T., Wheelock, John T., and Jones, Lawrence L. Tue . "Method for treating rare earth-transition metal scrap". United States. https://www.osti.gov/servlets/purl/868613.
@article{osti_868613,
title = {Method for treating rare earth-transition metal scrap},
author = {Schmidt, Frederick A. and Peterson, David T. and Wheelock, John T. and Jones, Lawrence L.},
abstractNote = {Rare earth-transition metal (e.g., iron) scrap (e.g., Nd-Fe-B scrap) is flux (slag) remelted to reduce tramp non-metallic impurities, such as oxygen and nitrogen, and metallic impurities, such as Li, Na, Al, etc., picked up by the scrap from previous fabrication operations. The tramp impurities are reduced to concentrations acceptable for reuse of the treated alloy in the manufacture of end-use articles, such as permanent magnets. The scrap is electroslag or inductoslag melted using a prefused, rare earth fluoride-bearing flux of CaF.sub.2, CaCl.sub.2 or mixtures thereof or the slag resulting from practice of the thermite reduction process to make a rare earth-iron alloy.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {12}
}

Patent:

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