Recycling of Neodymium Iron Boron Magnet Scrap.
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9481, 1993 Jan; :1-28
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.
Materials-recovery; Separation; Rare-earth-elements; Neodymium-compounds; Iron-alloys; Boron-containing-alloys; Sulfuric-acid; Precipitation-chemistry; Magnets; Recycling
Report of Investigations
NTIS Accession No.
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9481