Paper Information

Journal:   JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   2015 , Volume - , Number 73; Page(s) 69 To 107.
 
Paper: 

RECOVERY OF LANTHANIDES AND YTTRIUM FROM SINGLE SUPER PHOSPHATE FERTILIZER USING D2EHPA AND A SYNERGISTIC D2EHPA-TBP MIXTURE

 
 
Author(s):  MILANI S.A.*, NAZEMI S.H., REZAEI B.
 
* NUCLEAR FUEL CYCLE RESEARCH SCHOOL, NUCLEAR SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE, AEOI, TEHRAN- IRAN
 
Abstract: 

The recovery of lanthanides (lanthanum, cerium, erbium, and europium) and yttrium from nitrate leach liquor of single super phosphate fertilizer was investigated using di-(2-ethylhexyl) phosphoric acid (D2EHPA). After the preliminary crushing in specified dimensions, first, nitric acid leaching was accomplished using 60% (13.28 mol L-1) nitric acid at 65oC, which resulted in the recovery of 91% for lanthanides and yttrium. The precipitation process from the leach liquor removed about 75% of interfering ions. Then, the raffinate and synthetic nitrate solutions were submitted to the extraction process. The main parameters of the extraction process were the extractant concentration, HNO3 concentration, temperature, contact time, and Vorg./Vaq.. After determination of the optimum condition of the extraction of lanthanides and yttrium, the extraction was performed using leach liquor solution, which resulted in the recovery of 97.65%, 97.82%, 98.12%, 95.82%, and 96.34% for La, Ce, Y, Er, and Er, respectively. Selective strippings of lanthanides and yttrium from the loaded organic phase were studied using nitric acid. The main variable for stripping process were the stripping agent concentration and the contact time between the loaded organic and aqueous phases. Under the determined optimum conditions, a one step stripping of the loaded organic phase, stripped 97.12%, 96.48%, 97.25%, 98.31%, and 97.12% of La, Ce, Y, Er, and Eu, respectively. The synergistic D2EHPA-TBP mixture increased the extraction efficiency by 3%.

 
Keyword(s): LANTHANIDS, YTTRIUM, SINGLE SUPER PHOSPHATE FERTILIZER, SOLVENT EXTRACTION, SYNERGISM
 
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