EVALUATION OF VARIOUS COMPLEXING AGENTS IN THE PREPARATION OF ENRICHED CONCENTRATES OF RARE EARTHS OF THE YTTRIUM GROUP (in Russian)
Previously rare earths of the yttrium group were separated into separate fractions with the use of EDTA as a complexing agent. The possibility of using other organic acids such as acetic, malonic, tartaric, lactic, citric, and nitrilotriacetic acids was investigated. The amount of complexing agent was calculated from the content of the last five rare earths of the yttrium group (Ho- Lu). The pH of the solution was maintained as high as possible (from 3-5 to 4.5) without actually precipitating the basic rare earth salt. Ammonium oxalate was used as the precipitant. Y/sup 91/ and Tu/sup 170/ were used as tracers to follow the behavior of yttrium and the heavy rare earths, respectively. It was found that acetic acid and malonic acids formed very weak complexes with the rare earths. Nitrilotriacetic, tartaric, citric, and lactic acids formed strong complexes with the rare earths. Lactic and citric acids were the most effective in separating yttrium from the heavier rare earths. In this regard the separation of yttrium from thulium is much sharper with lactic acid than it is with citric acid. (TTT)
- Research Organization:
- Vernadskii Inst. of Geochemistry and Analytical Chemistry, Academy of Sciences, USSR
- NSA Number:
- NSA-14-018840
- OSTI ID:
- 4151222
- Journal Information:
- Zhur. Neorg. Khim., Vol. Vol: 5; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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Related Subjects
ACETIC ACID
ACIDITY
AMMONIUM COMPOUNDS
CHELATES
CHEMICAL REACTIONS
CITRIC ACID
COMPLEXES
EDTA
ENRICHMENT
LACTIC ACID
MALONIC ACID
MATHEMATICS
NTA
ORGANIC ACIDS
ORGANIC NITROGEN COMPOUNDS
OXALATES
PRECIPITATION
PRODUCTION
QUANTITY RATIO
RARE EARTHS
SEPARATION PROCESSES
SOLUTIONS
TARTARIC ACID
THULIUM 170
TRACER TECHNIQUES
YTTRIUM
YTTRIUM 91