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Recycling of Neodymium Iron Boron Magnet Scrap.

Authors
Lyman-JW; Palmer-GR
Source
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9481, 1993 Jan; :1-28
Link
NIOSHTIC No.
10012179
Abstract
The U.S. Bureau of Mines investigated methods of separating valuable rare-earth materials from Fe in neodymium iron boron (NdFeB) magnet scrap. The best separation of rare earths from bulk NdFeB magnet scrap was obtained by dissolution with H2SO4 followed by precipitation of recyclable rare-earth salts. By precipitating neodymium-alkali sulfate double salts as an intermediate that can be converted to a variety of useful products, many materials-handling and economic disadvantages found with direct precipitation with fluoride or oxalate were avoided. Iron was removed from magnet leach solutions by precipitation as a jarosite, eliminating a major disposal problem.
Keywords
Materials-recovery; Separation; Rare-earth-elements; Neodymium-compounds; Iron-alloys; Boron-containing-alloys; Sulfuric-acid; Precipitation-chemistry; Magnets; Recycling
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB94-112646
NTIS Price
A03
Identifying No.
RI-9481
NIOSH Division
SLRC
Source Name
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9481
State
UT
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