|About this Abstract
||Part C-3: Processing of Critical Metals
||Selective Extraction of Rare Earth Elements from Rich Iron Ores
||Leandro Teixeira, Ruberlan Silva, Angela Avelar, Daniel Majuste, Virgínia Ciminelli
|On-Site Speaker (Planned)
Rare Earth Elements (REE) are fundamental for modern life products and green technologies. Supply constrain and the price peak of 2011 boosted intensive research for alternatives for processing and separation.
Complex monazite-type, rare earth ores usually contain high acid consumption impurities, such as iron and aluminium, and radioactive thorium in its composition. These impurities are not removed by conventional concentration processes due to fine, micro level association between the REE carrying minerals and the gangue minerals. This work presents a selective process route for REE extraction from iron rich ores. The process involves sulfation by concentrated sulfuric acid addition and pyrohydrolysis at high temperature. A thermodynamic analysis of the main reactions is presented. The experimental results show REE extraction as high as 80% with low iron and thorium extraction (below 1%), and acid consumption lower than 0.250 kg per kg of ore.
||Planned: At-meeting proceedings