CsAlSi/sub 5/O/sub 12/: a possible host for /sup 137/Cs immobilization

Technical Report · Wed Mar 31 04:00:00 EST 1982

DOI:https://doi.org/10.2172/5321483· OSTI ID:5321483

Adl, T.; Vance, E. R.

CsAlSi/sub 5/O/sub 12/ exhibits more acid resistance than pollucite (CsAlSi/sub 2/O/sub 6/). At pH values of 1.02 and 1.40, the extraction of Cs from CsAlSi/sub 5/O/sub 12/ at 25/sup 0/C was approximately proportional to the square root of leach time. The Cs extraction at 25/sup 0/C varied as (H/sup +/)/sup 0/ /sup 36/ over the pH range of 1 to 6. Also, the Cs extraction in various brines at 300/sup 0/C/30 MPa was comparable with that for pollucite. CsAlSi/sub 5/O/sub 12/ can be crystallized at about 1000/sup 0/C from calcines if a small amount of CaO is present, but in the absence of such sintering acids, crystallization temperatures of about 1400/sup 0/C are necessary. Compatibility data were also obtained with respect to several other phases with which CsAlSi/sub 5/O/sub 12/ might be expected to coexist in tailored ceramics designed for high-level defense waste.

• Research Organization: Rockwell International Corp., Canoga Park, CA (USA). Energy Systems Group; Pennsylvania State Univ., University Park (USA). Materials Research Lab.
• DOE Contract Number: AC09-79ET41900
• OSTI ID: 5321483
• Report Number(s): DOE/ET/41900-14; ESG-DOE-13369; ON: DE82013246
• Country of Publication: United States
• Language: English

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