Separation of Zirconium from Hafnium by Solvent Extraction.
U S Pat 4 231 994 1980 Nov; :
Zirconium is separated from hafnium in a sulfate solution by extraction with an amine and an alpha-hydroxycarboxylic acid. The preferred amines are trioctylamine and alamine 336. The preferred acids are lactic, glycolic, and citric acids. Thus, a feed solution containing 5.82 Zr and 0.104 Hf g/l in 1m h2so4 was mixed with 74 g lactic acid. An organic solution was prepared by equilibration with 1m h2so4 a solution of 10 pct trioctylamine and 5 pct decanol in kerosine. One liter of this solution was added to the above aqueous solution and the mixture was agitated for 1 min. The zr/hf separation factor was 14.4. Without the lactic acid the separation factor was 9.1.
U.S. Pat. 4,231,994; Nov. 4, 1980; Chem. Abstr. 93:135,811F