Recycling of neodymium iron boron magnet scrap. Report of Investigations/1993

Technical Report · Thu Dec 31 23:00:00 EST 1992

OSTI ID:5525319

Lyman, J W; Palmer, G R

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.

• Research Organization: Bureau of Mines, Salt Lake City, UT (United States). Salt Lake City Research Center
• OSTI ID: 5525319
• Report Number(s): PB-94-112646/XAB; BUMINES-RI--9481
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320302* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Materials
36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALLOYS
BORON ALLOYS
CHEMICAL REACTIONS
ELEMENTS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRON ALLOYS
MAGNETS
MANAGEMENT
MATERIALS RECOVERY
METALS
NEODYMIUM COMPOUNDS
PROCESSING
RARE EARTH COMPOUNDS
RARE EARTHS
RECYCLING
SALTS
SCRAP
SEPARATION PROCESSES
SOLID WASTES
SULFURIC ACID
WASTE MANAGEMENT
WASTE PROCESSING
WASTES