Research and Development of Concentration and Recovery Method for Phosphor Containing Rare Earth Elements Using Magnetic-force Control Technology

In order to efficiently collect used phosphors containing rare earths, an attempt was made to concentrate the phosphors. The technique used was a combination of high-gradient magnetic separation and the magneto-Archimedes’ method. Each phosphor was fractionated and concentrated from waste phosphors. LAP that emits green light is fractionated using highgradient magnetic separation and YOX that emits red light was fractionated using the magneto-Archimedes' method. Concentrations of 5.5 and 1.9 times were achieved, respectively.