Fixation of Medium-Level Wastes in Titanates and Zeolites:Progress Towards a System for Transfer of Nuclear Reactor Activities from Spent Organic to Inorganic Ion Exchangers

Forberg, S.; Westermark, T.; Arnek, Robert; Grenthe, Ingmar; Fälth, Lars; Andersson, S. Lars T.

doi:10.1007/978-1-4684-3839-0_104

Cited by 4 publications

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“…Other than phillipsites and heulandite, the commercially available natural zeolites do not undergo such structural collapse (Hoss and Roy, 1960;Breck, 1974;Komarneni and Roy, 1981) and, therefore, need very high temperatures of 1200~ (Mimura and Kanno, 1980;Forberg et al, 1980) for the immobilization of Cs in crystalline phases. Heutandite, which was not investigated here, is also a potential zeolite for Cs fixation inasmuch as it undergoes structural collapse at > 360~ (Mumpton, 1960).…”

Section: Fixation Of Cs In Phillipsitesmentioning

confidence: 99%

Phillipsite in Cs Decontamination and Immobilization

Komarneni

1985

Clays and clay miner.

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Abstract--The Cs selectivity of several natural zeolitic tufts and synthetic zeolites was measured. Phillipsite-rich tufts from California and Nevada exchanged 13.5 and 23.7%, respectively, of the Cs present in simulated alkaline defense waste containing 0.00025 M CsCl in 5.5 M NaC1-NaOH solution from the Savannah River Plant, Aiken, South Carolina; whereas mordenite-rich tufts from Arizona and Nevada exchanged less than 12.7%. The immobilization or fixation of Cs in phillipsite unlike other zeolites can be achieved by heating the zeolite at 600~ for 4 hr in air and collapsing the silicate (aluminate) tetrahedral tings around the Cs ions to produce a Cs-feldspar-type phase. Treatment of the Cs-exchanged phillipsiterich tuft at 800 ~ to 1000~ resulted in pollucite, CsA1Si206, which also "locks in" the Cs ions in its structure. The fixation of Cs exchanged in phillipsite can also be achieved by the formation of pollucite upon hydrothermal treatment at 300~ and 30 MPa pressure within 12 hr. These results suggest that phillipsite-rich tufts are good candidates for Cs immobilization by heat treatment at low temperatures after they have been used as sorbents in waste decontamination.

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Section: Fixation Of Cs In Phillipsitesmentioning

confidence: 99%