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:
-
- Ames, IA
- Nevada, IA
- Des Moines, IA
- Issue Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)
- OSTI Identifier:
- 868613
- Patent Number(s):
- 5174811
- Application Number:
- 07/591,040
- Assignee:
- Iowa State University Research Foundation, Inc. (Ames, IA)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- 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. Wed .
"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 = {Wed Jan 01 00:00:00 EST 1992},
month = {Wed Jan 01 00:00:00 EST 1992}
}
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