Recovery of rare earths from sludges containing rare-earth elements

摘要

To develop a process for the recovery of rare-earth elements from sludges, a chemical recycling process was applied to neodymium-containing boron trioxide. It was found that the neodymium was successfully extracted as either sodium neodymium sulfate hydrate or neodymium hydroxide from neodymium-containing boron trioxide by this process.