SEPARATION OF PALLADIUM AND CESIUM FROM ACID SOLUTION OF NITRIC ACID SUCH AS HIGH LEVEL RADIOACTIVE WASTE LIQUID

Japanese Patent JP3733417

B2

PROBLEM TO BE SOLVED: To efficiently separate Pd and Cs by first bringing coppery insoluble hexacyanoferrate (II), oxidation-treated substance thereof, or copper hexacyanoferrate (III) into contact with an acidic solution of nitric acid to absorptively separate Pd selectively.
SOLUTION: A material consisting of oxidation-treated substance of coppery insoluble hexacyanoferrate (II) or copper hexacyanoferrate (III), by which Pd is adsorbed and supported under the condition that no nitrous acid is allowed to coexist, is subjected to reduction treatment. A solution, from which Pd is removed, is brought into contact with the above material, by which Cs is absorptively separated selectively. The absorbent, which is made to adsorb Cs, is subjected to oxidation treatment using a nitric acid solution containing nitrous acid, by which Cs is desorbed. The adsorbent, from which Cs is desorbed, is subjected to reduction treatment and reclaimed as a Cs adsorbent. It is preferable that contact time with the acidic solution of nitric acid for Pd separation is regulated to ≥48 hr. Moreover, it is desirable to add hydrazine, sulfamic acid, etc., as antioxidant in order to produce the maximum Pd adsorptivity of coppery insoluble hexacyanoferrate (II).

Koichi Tanihara

JP5646399A

January 11, 2006

March 04, 1999

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National Institute of Advanced Industrial Science and Technology

C22B11/00; C22B26/10; (IPC1-7): C22B11/00; C22B26/10

JP5254828A
JP5317697A
JP7308590A
JP9173832A

Aun Agata

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