skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Desorption of Cesium from Clay Minerals.

Abstract

Abstract not provided.

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
Work for Others (WFO)
OSTI Identifier:
1378250
Report Number(s):
SAND2016-8327C
646890
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the ACS 2016 Fall Meeting held August 21-25, 2016 in Philadelphia, PA.
Country of Publication:
United States
Language:
English

Citation Formats

Yoon, Hongkyu, Ilgen, Anastasia Gennadyevna, and Mills, Melissa Marie. Desorption of Cesium from Clay Minerals.. United States: N. p., 2016. Web.
Yoon, Hongkyu, Ilgen, Anastasia Gennadyevna, & Mills, Melissa Marie. Desorption of Cesium from Clay Minerals.. United States.
Yoon, Hongkyu, Ilgen, Anastasia Gennadyevna, and Mills, Melissa Marie. 2016. "Desorption of Cesium from Clay Minerals.". United States. doi:. https://www.osti.gov/servlets/purl/1378250.
@article{osti_1378250,
title = {Desorption of Cesium from Clay Minerals.},
author = {Yoon, Hongkyu and Ilgen, Anastasia Gennadyevna and Mills, Melissa Marie},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • Weathering behavior and contaminant (Sr and Cs) uptake by specimen clays (illite, vermiculite, montmorillonite and kaolinite) and their secondary solid phase products were studied in batch systems under geochemical conditions characteristic of leaking tank waste at the Hanford Site in WA (0.05 M AlT, 2 M Na+, 1 M NO3 -, pH {approx}14, Cs+ and Sr2+ present as co-contaminants). Time series experiments were conducted from 0 to 369 days, with initial Cs+ and Sr2+ concentrations ranging from 10-5 to 10-3 M. Cesium sorption after 369 d reaction was the greatest in the order of vermiculite, illite, montmorillonite and kaolinite atmore » 10-3 M Cs/Sr. In the case of Sr, vermiculite showed highest Sr sorption and was followed by kaolinite, montmorillonite and illite at highest loading Cs/Sr after 369 d. Secondary phase products were feldspathoid sodium aluminum nitrate silicate, sodium aluminum nitrate silicate hydrate, Na-Al chabazite and zeolite X in weathered clays. Discrete Sr single phases were found in kaolinite and illite systems after 369 d at 10-3 M Cs/Sr.« less
  • The research described in this paper is part of a continuing program aimed at understanding the chemical reactions between nuclear waste materials and shale repositories in the presence of hot, pressurized ground water. This paper treats the immobilization of Cs released from spent fuel elements by simulated hydrothermal fluids when this fission product interacts with clay minerals in the repository wall rock. Various clay minerals or shales were reacted with likely Cs sources and water at 300 bars pressure and 100/degree/, 200/degree/, and 300/degree/C for 4, 2 and 1 months, respectively. Pollucite was the principal product, but CsAlSiI/sub 4/ wasmore » also observed, along with unreacted or hydrothermally altered aluminosilicates. From Cs concentrations of the product solutions partition of Cs between liquid and solids was found to vary depending on the Cs source, the clay or shale phase, temperature, and run duration. Fixation of as much as 97% of the Cs in some solids was observed. In addition to Cs-aluminosilicates, Cs was fixed on cation-exchange sites by interlayer collapse in montmorillonite. Reactions with Cs/sub 2/MoO/sub 4/ also produced powellite. The reaction products pollucite and uraninite can immobilize much of the Cs and U from spent fuel elements. Refs.« less
  • Using backscattered electron microscopy and energy dispersive x-ray analysis, the authors have studied possible formation of authigenic clay minerals in sediments as well as alteration of detrital material at depth in various diagenetic environments. These include oozes from DSDP Site 594, off eastern South Island, New Zealand, and Lower Jurassic shales from Whitby, England and the southern Northern Sea. Banded structures appear parallel to the c axis direction in many of the individual clay minerals observed, and are the result of differences in chemical composition, probably related to differing iron percentages. DSDP samples from the surface to 90 meters depthmore » do not contain the bands, while below this depth to 458 meters, the number and density contrast of banding increase with time/depth. Lower Jurassic shales are more intensely banded than any of the DSDP samples. Microcracking and displacement occur at the micron level along certain bands, suggesting that deformation weakened the structures and opened pathways for fluid movement. It seems likely that this phenomenon is due to diagenesis and increases with age/depth/time. Its relation to the smectite/illite transformation is uncertain at this time, but worth investigating.« less
  • Petrographic analyses of core samples from wells in the East Slovakian basin indicate that alteration products of volcanic materials cause porosity loss in sandstone reservoirs. The reservoirs, which produce natural gas, are part of a shallow marine to continental basin fill with interbedded volcaniclastics, tuffs, and volcanites. Abnormally high heat-flow values have been recorded in the basin fill, which reaches up to 7 km in thickness. Both clay minerals and zeolites are found to restrict porosity. Kaolinite, smectite, illite, chlorite, and mixed-layer clay minerals are all identified in various combinations. Zeolites identified include phillipsite, erionite, clinoptilolite, and analcime. These mineralsmore » are related to the occurrence of volcanic rock fragments in the reservoir sand and interbedded volcanics, and they occur as diagenetic replacement minerals and cements. The effects of these minerals are compounded by the initial poor reservoir quality caused by immature sediments and calcite cement. Reservoir productivity would probably be increased if drilling and completion practices in the basin reflected the potential effects of the clay minerals and zeolites.« less
  • The adsorption excess isotherms of n-pentanol and nitrobenzene were determined with surfactant-modified (hexadecylanimonium ions) layered silicates. Both liquids intercalate into the silicate layers and increase the basal spacing, determined by X-ray diffraction measurements, depending on the equilibrium concentration in the bulk phase. To control the entropy change due to the intercalation, flow microcalorimetric experiments were made and enthalpy of displacement isotherms (adsorption and desorption) were determined. The information obtained from these three different measurements permitted the assessment of the composition of the interlarnellar space (in volume fraction of the intercalated molecules) and the thermodynamics of adsorption.