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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 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. 3 figs.

Inventors:
; ; ;
Issue Date:
OSTI Identifier:
7205646
Patent Number(s):
5174811 A
Application Number:
PPN: US 7-591040
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States) PTO; EDB-94-088690
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; IRON BASE ALLOYS; MATERIALS RECOVERY; RARE EARTH ALLOYS; SCRAP METALS; MELTING; RECYCLING; ALLOYS; ELEMENTS; IRON ALLOYS; MANAGEMENT; METALS; PHASE TRANSFORMATIONS; PROCESSING; SCRAP; SOLID WASTES; WASTE MANAGEMENT; WASTE PROCESSING; WASTES; 320305* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management

Citation Formats

Schmidt, F.A., Peterson, D.T., Wheelock, J.T., and Jones, L.L. Method for treating rare earth-transition metal scrap. United States: N. p., 1992. Web.
Schmidt, F.A., Peterson, D.T., Wheelock, J.T., & Jones, L.L. Method for treating rare earth-transition metal scrap. United States.
Schmidt, F.A., Peterson, D.T., Wheelock, J.T., and Jones, L.L. Tue . "Method for treating rare earth-transition metal scrap". United States.
@article{osti_7205646,
title = {Method for treating rare earth-transition metal scrap},
author = {Schmidt, F.A. and Peterson, D.T. and Wheelock, J.T. and Jones, L.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 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. 3 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {12}
}