The Sulfuric Acid Baking of NdFeB Magnet Scrap
Patrick Taylor and Brett Carlson
Summary: A method for extracting rare earth metals from Nd2Fe14B magnet scrap
Description: This invention reports a method by which sulfuric acid baking allows
for the selective extraction of rare earth metals from scrap Nd2Fe14B magnets.
This process has the advantage of making water soluble high value rare earth
metals while converting the contained iron, around 70% of the magnet’s mass,
into stable and insoluble iron (I I) oxide, eliminating the need for separating and
precipitating iron from solution. The process also has the advantage of safely
disposing of metalworking fluid contained in rare earth magnet machine waste, a
troublesome contaminate from technical and environmental perspective.
Main Advantages of this Invention
 Makes for easy extraction of high value rare earth metals
 Iron waste easily separated
 Environmentally friendly
Potential Areas of Application
 Recycling of magnets
 Separations in a mine setting
ID number: 15001
Intel ectual Property Status: Provisional patent application 62/047,381 filed
September 8, 2014
Opportunity: We are seeking an exclusive or non-exclusive licensee for
implementation of this technology.
For more information contact:
William Vaughan, Director of Technology Transfer
Colorado School of Mines, 1500 Illinois Street, Guggenheim Hall Suite 314, Golden, CO 80401
Phone: 303-384-2555; e-mail: