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Title: Rare earth-transition metal scrap treatment method

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. 3 figs.

Inventors:
; ; ; ;
Issue Date:
OSTI Identifier:
7207598
Patent Number(s):
5087291 A
Application Number:
PPN: US 7-591046
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States) PTO; EDB-94-081318
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Resource Relation:
Patent File Date: 1 Oct 1990
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; SCRAP METALS; MELTING; RECYCLING; BORON ALLOYS; IRON BASE ALLOYS; METAL INDUSTRY; NEODYMIUM ALLOYS; SEPARATION PROCESSES; ALLOYS; ELEMENTS; INDUSTRY; IRON ALLOYS; METALS; PHASE TRANSFORMATIONS; RARE EARTH ALLOYS; SCRAP; SOLID WASTES; WASTES; 320305* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management

Citation Formats

Schmidt, F.A., Peterson, D.T., Wheelock, J.T., Jones, L.L., and Lincoln, L.P. Rare earth-transition metal scrap treatment method. United States: N. p., 1992. Web.
Schmidt, F.A., Peterson, D.T., Wheelock, J.T., Jones, L.L., & Lincoln, L.P. Rare earth-transition metal scrap treatment method. United States.
Schmidt, F.A., Peterson, D.T., Wheelock, J.T., Jones, L.L., and Lincoln, L.P. Tue . "Rare earth-transition metal scrap treatment method". United States.
@article{osti_7207598,
title = {Rare earth-transition metal scrap treatment method},
author = {Schmidt, F.A. and Peterson, D.T. and Wheelock, J.T. and Jones, L.L. and Lincoln, L.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. 3 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {2}
}