Solvay is an active participant in the rare earth industry, particularly in the separation of heavy rare earths.


We offer CYANEX® 572, a highly stable, phosphorus-based chelating extractant that is designed to improve SX performance relative to traditional phosphonic acid extractants. It has been specially formulated for the extraction and purification of rare earth elements. It has an extraction strength profile that allows efficient extraction of the heavy rare earth elements while allowing the back extraction / stripping operation to utilize lower strip acid concentrations.


Key benefits include:

  • Substantial acid savings

  • Selective for heavy rare earth metals

  • Manufactured in North America

  • Optimization over traditional phosphonic acid extractants