Multi-mineral use for pure REE and phosphorus production- MULTIREEP

Important results from the project

The project has studied possible extraction of REE and P from apatite ferric allanite, monazite and synthetic cerium phosphate. The work included characterization, pretreatment, leaching and separation with a focus on leaching. The results indicate that REE and P can be extracted but pretreatment and process conditions are crucial. New developed knowledge lays an foundation for continued research and development of P and REE production in Sweden.

Expected long term effects

The results and the knowledge built up by LTU and LKAB can contribute to future expanded P and REE extraction. If flexible methods able to extract REE and P from feed of various mineral composition, although sometimes with extra process steps, their production potential increases. The project has strengthened the expertise in industry and academia, which is crucial for future development. A full-scale project application is planned and a PhD project for fundamental studies has been initiated.

Approach and implementation

The project investigated possible extraction of REE and P from apatite, ferriallanite, monazite and synthetic cerium phosphate through characterization, pretreatment, leaching and separation. The approach was relevant and the project plan generally followed. Some obstacles arose, e.g. the purchased monazite contained dolomite and the pretreatment initially gave low REE leaching. Good understanding of the system was achieved and the collaboration between LKAB and the research groups worked well.