Sequestration of cesium and strontium by tobermorite synthesized from fly ashes

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08790.x· OSTI ID:271684

Ma, W; Brown, P W; Komarneni, S ^[1]

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1. Pennsylvania State Univ., University Park, PA (United States). Intercollege Materials Research Lab.

Tobermorites were synthesized from oxides and from fly ashes under mild hydrothermal conditions. The bulk compositions of the ash-based formulations were adjusted to give the same [Ca]/[Si + Al] ratio as for the oxides. Selective Cs and Sr exchange with these tobermorites was measured. Compared to those prepared from the oxides and from class C fly ash, the tobermorites obtained from class F fly ash exhibited superior Cs and Sr selective properties. This is apparently a result of more extensive Al incorporation with class F fly ash. For example, tobermorite synthesized from class F fly ash exhibited a cesium K{sub d} (mL/g) of 3,826 while those prepared from oxides and from class C fly ash showed K{sub d} values of 1,112 and 796, respectively, under the same conditions. These results suggest that fly ash waste materials can be converted into tobermorite, which can serve as a resource in the separation, immobilization, and disposal of radioactive species such as Cs and Sr.

• Sponsoring Organization: USDOE
• OSTI ID: 271684
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 6 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
40 CHEMISTRY
ABSORPTION SPECTROSCOPY
CALCIUM SILICATES
CESIUM
CHEMICAL COMPOSITION
DRYING
FLY ASH
HYDROTHERMAL SYNTHESIS
ION EXCHANGE
RADIOACTIVE WASTE DISPOSAL
SILICATE MINERALS
STRONTIUM
TEMPERATURE DEPENDENCE
WASTE PRODUCT UTILIZATION
X-RAY DIFFRACTION