Non-thermal Extraction of Rare Earth Elements from Fluorescent Powder by Means of its Mechanochemical Treatment

摘要

Leaching of fluorescent powder containing rareearths using 1N HCl solution at room temperature was conductedto extract the rare earths, followed by dry grinding of the powderusing a planetart ball mill. The dry mechanochemical treatment ofthe powder causes the structural change of the crystals in thepowder into a disordered system. This mechanochemical treatmentleads to easy extraction of the rare earths. Only 3 minutes ofgrinding enables us to extract Y and Eu at above 70-80 percentyield. More than 80 percent of the other rare earths can beextracted from the powder ground for 2-hours. Themechanochemical treatment to the fluorescent powder beforeleaching would be an effective operation to be able to extract therare earths at high yield in room temperature leaching even by lowconcentration HCl solution.