Development of a Geochemical Speciation Model for Use in Evaluating Leaching from a Cementitious Radioactive Waste Form

2021 ◽  
Author(s):  
Zhiliang Chen ◽  
Peng Zhang ◽  
Kevin G. Brown ◽  
Janelle L. Branch ◽  
Hans A. van der Sloot ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Waste Form ◽  
Speciation Model ◽  
Geochemical Speciation

scholarly journals Thermodynamic assessment of the hollandite high‐level radioactive waste form

2019 ◽  
Vol 102 (10) ◽  
pp. 6284-6297 ◽  
Author(s):  
Stephen A. Utlak ◽  
Theodore M. Besmann ◽  
Kyle S. Brinkman ◽  
Jake W. Amoroso
Keyword(s):  
Radioactive Waste ◽  
Thermodynamic Assessment ◽  
Waste Form ◽  
High Level Radioactive Waste ◽  
High Level

scholarly journals Cementation of Bioproducts Generated from Biodegradation of Radioactive Cellulosic-Based Waste Simulates by Mushroom

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
S. B. Eskander ◽  
S. M. Abd El-Aziz ◽  
H. El-Sayaad ◽  
H. M. Saleh
Keyword(s):  
Radioactive Waste ◽  
Portland Cement ◽  
Current Work ◽  
Waste Form ◽  
Pleurotus Pulmonarius ◽  
Long Term Stability ◽  
Surrounding Environment ◽  
Solidified Waste ◽  
Physical And Chemical

The current work was devoted to study the solidification of bioproducts originated from the bioremediation of mixture of solid cellulose-based radioactive waste simulates using a mushroom (Pleurotus pulmonarius), in Portland cement. The obtained solidified waste form was subjected to mechanical integrity qualification after curing periods of 28 and 90 days. Chemical performance of the cement-waste form was also evaluated in different leachant media during 540 days. The results obtained gave useful information about the mechanical, physical, and chemical performances of the final cement-waste form incorporated the radioactive bioproducts. Moreover, it indicated that cement can provide a highly durable form that ensures a long-term stability of the solidified waste material and can act as a first barrier against the release of radiocontaminants from radioactive wastes to the surrounding environment.

A Single Phase ([Nzp]) Ceramic Radioactive Waste Form

1982 ◽  
Vol 15 ◽  
Author(s):  
Rustum Roy ◽  
L.J. Yang ◽  
J. Alamo ◽  
E.R. Vance
Keyword(s):  
Radioactive Waste ◽  
Single Phase ◽  
Waste Form ◽  
Chemical Model ◽  
Crystal Chemical ◽  
Ceramic Waste ◽  
Molar Ratios ◽  
Loading Level ◽  
Waste Forms ◽  
Waste Loading

ABSTRACTIt has been shown that between 10 and 20% of a simulated PW–4b radwaste composition can be incorporated into a single nhase with the NZP (= ‘MaZr2 P3 o12’) structure. By changing the P/Na and Zr/Na molar ratios (i.e., adjusting the crystal chemical model of where each ion is located in the structure) it has been possible to outline a very ‘forgiving’ compositional regime both at the 10% and the 20% waste loading level within which one obtains one ([NZP]) or two ([NZP] and [monazite]) phases. We have also succeeded in substituting Tio2 for Zro2 in making a TiO2-rich [NTP] waste form analogous to the [NZ]] materials.Thus we have succeeded in creating monophasic and diphasic ceramic waste forms which can be sintered below 1000° C. Only preliminary leach data have been obtained at 25° and 300°C, and they place this material with good ceramic forms.

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