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Recent research activities on chemistry of the minor actinides (MA) in the nuclear fuel cycle are described. In particular, work done on chemical recoveries of MA, including partitioning of actinides from high level liquid waste (HLLW), fabrication of targets for MA transmutation, and denitration of liquid alpha waste is considered. Curium-244, used to dope waste glass for stability tests, was recovered from this glass by a special procedure. Neptunium, americium and curium in gram amounts were recovered and purified by a combination of precipitation methods and extraction chromatography. Extraction agents for the actinide elements were compared in experiments on genuine HLLW in centrifugal contactors. Co-precipitation of the actinide hydroxides with ammonia by the sol-gel technique was selected as the first step in the fabrication of targets for transmutation. A new method for denitration by photochemical means is presented. It is applicable to alpha-bearing wastes containing ammonia, such as those arising in the sol-gel process.

Additional information

Authors: BOKELUND H, JRC Karlsruhe (DE);GLATZ J-P, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: International Symposium on Actinides : Processing and Materials, San Francisco (US), February 27 - March 3, 1994
Availability: Available from (1) as Paper EN 37999 ORA
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