Separation of Rare Earth Elements in the System Tributyl Phosphate - Ln(NO<sub>3</sub>)<sub>3</sub> - Ca(NO<sub>3</sub>)<sub>2</sub> in the Counter Current Process
The 40th step extraction process of separation of REE according to the line praseodymium-cerium with use of mixer - settler extractors in the system of 100% TBP - Ln(NO3)3 - Ca(NO3)2 is realized. Lanthanum - cerium concentrate containing less than 0,03% of other rare-earth elements is received. The process flow diagram of separation of the rare-earth concentrate proceeded from phosphogypsum is considered.