Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/5527
Title: Coal fly ash as a potential fixation reagent for radioactive wastes
Authors: Lieberman, Roy Nir
Green, Uri
Segev, Giora
Polat, Mehmet
Mastai, Yitzhak
Cohen, Haim
Keywords: Carbonate
Fixation
Fly ash
Radioactive
Waste
Sulfur concentrations
Issue Date: 2015
Publisher: Elsevier Ltd.
Source: Lieberman, R. N., Green, U., Segev, G., Polat, M., Mastai, Y., and Cohen, H. (2015). Coal fly ash as a potential fixation reagent for radioactive wastes. Fuel, 153, 437-444. doi:10.1016/j.fuel.2015.02.111
Abstract: Israel produces ∼1.3 Mt/year of fly ash (FA), a byproduct of its coal-fired power plants. Due to increasing environmental regulations, these imported coals are processed to reduce the sulfur concentration (∼0.6%). These processing methods result in a material that has an enriched alkali/alkali earth component with pozzolanic and basic properties (pH > 10.5). FAs are utilized worldwide, mainly as a cement additive for the construction industry. Recently, it was demonstrated that Class F FA can act as an excellent fixation reagent for acidic wastes from the phosphate or the oil regeneration industries. In the current work the potential utilization of Class F FAs as fixation reagents for low-activity radioactive waste from the nuclear industry was examined. Aqueous solutions containing radionuclide simulants: cesium (Cs+), strontium, (Sr2+), and cerium (Ce3+, Ce4+) were used as case studies with promising results. It is suggested that the primary fixation mechanism involves the aluminate/silicate anions at the FA surface. A novel experimental fixation approach utilizing the formation of carbonates is demonstrated and a new interaction mechanism is suggested based on the electrostatic interactions of the positively charged fine precipitates with the negatively charged FA surface. © 2015 Elsevier Ltd. All rights reserved.
URI: http://doi.org/10.1016/j.fuel.2015.02.111
http://hdl.handle.net/11147/5527
ISSN: 0016-2361
Appears in Collections:Chemical Engineering / Kimya Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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