Dehalogenation of electrochemical processing salt simulants with ammonium phosphates and immobilization of salt cations in an iron phosphate glass waste form

ABSTRACTA series of iron phosphate glass waste forms with compositions of 45Fe2O3-55P2O5, 20Fe2O3-80P2O5, and 20Fe2O3-20Na2O-60P2O5, namely FeP-1, FeP-2 and FeP-3, was studied by analytical electron microscopy (AEM). Transmission electron microscopy (TEM) bright-field (BF) imaging showed that under the electron irradiation, phase segregation occurred in both the FeP-1 and FeP-2 samples at high electron doses (3.84×1026 e/m2). In contrast, bubbles formed in the FeP-3 sample, even at a relatively low dose (2.88×1025 e/m2), which may be attributed to the migration of Na under irradiation as in the case in sodium borosilicate glass. Series electron energy-loss spectroscopy (EELS) analysis showed that the glass materials experienced mass-loss and composition variation. No obvious Fe valence state changes under irradiation were observed within the irradiation period.

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Microstructure and Chemistry of an Aluminophosphate Glass Waste Form under Electron Beam Irradiation

MRS Proceedings ◽

10.1557/proc-807-121 ◽

2003 ◽

Vol 807 ◽

Cited By ~ 8

Author(s):

K. Sun ◽

L. M. Wang ◽

R. C. Ewing

Keyword(s):

Electron Irradiation ◽

Analytical Electron Microscopy ◽

Iron Phosphate ◽

Phosphate Glasses ◽

Waste Form ◽

Irradiation Damage ◽

Glass Waste ◽

Electron Dose ◽

Aluminophosphate Glass ◽

Iron Phosphate Glasses

ABSTRACTAn alkali-containing (mainly sodium) aluminophosphate glass waste form was studied by analytical electron microscopy. Bright-field imaging showed that small bubbles formed under the electron irradiation even at a low electron dose (8×1022e/m2). These bubbles grew with the increase of the electron dose and were finally released at the surface of the sample. At the same time alkali elements were also lost under irradiation. At an electron dose of about 2.2×1026e/m2 (6.6×1011Gy), all the bubbles were released and no bubbles were formed with further irradiation. The glass was finally transformed to a pure aluminophosphate glass. Further irradiation resulted in the phase separation between the Al-rich and the P-rich phases. The electron irradiation damage effects on the aluminophosphate glass are compared to those observed in iron phosphate glasses.

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Iron phosphate glass waste forms for vitrifying Hanford AZ102 low activity waste (LAW), part I: Glass formation model

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2016.11.019 ◽

2017 ◽

Vol 458 ◽

pp. 149-156 ◽

Cited By ~ 2

Author(s):

Chandra S. Ray ◽

V.A. Samaranayake ◽

Ali Mohammadkhah ◽

Thomas E. Day ◽

Delbert E. Day

Keyword(s):

Phosphate Glass ◽

Glass Formation ◽

Iron Phosphate ◽

Formation Model ◽

Glass Waste ◽

Waste Forms ◽

Low Activity

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Iron phosphate glass waste forms for vitrifying Hanford AZ102 Low Activity Waste (LAW), part II: Property-composition model

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2018.05.007 ◽

2018 ◽

Vol 495 ◽

pp. 107-116 ◽

Cited By ~ 1

Author(s):

Chandra S. Ray ◽

V.A. Samaranayake ◽

Ali Mohammadkhah ◽

Thomas E. Day ◽

Delbert E. Day

Keyword(s):

Phosphate Glass ◽

Iron Phosphate ◽

Glass Waste ◽

Waste Forms ◽

Low Activity

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Leach Rates of Lead-Iron Phosphate Glass Waste Forms

Journal of Nuclear Science and Technology ◽

10.1080/18811248.1988.9735907 ◽

1988 ◽

Vol 25 (8) ◽

pp. 661-666 ◽

Cited By ~ 8

Author(s):

Tadashi YANAGI ◽

Makoto YOSHIZOE ◽

Naoki NAKATSUKA

Keyword(s):

Phosphate Glass ◽

Iron Phosphate ◽

Glass Waste ◽

Waste Forms

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Evaluation of lead-iron-phosphate glass as a high-level waste form

10.2172/5110201 ◽

1986 ◽

Cited By ~ 1

Author(s):

L.A. Chick ◽

L.R. Bunnell ◽

D.M. Strachan ◽

H.E. Kissinger ◽

F.N. Hodges

Keyword(s):

Phosphate Glass ◽

Iron Phosphate ◽

Waste Form ◽

High Level Waste ◽

High Level

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Optimization of Chemical Composition in the Iron Phosphate Glass as the Matrix of High Level Waste Generated From Pyroprocessing

Volume 4: Radiation Protection and Nuclear Technology Applications; Fuel Cycle, Radioactive Waste Management and Decommissioning; Computational Fluid Dynamics (CFD) and Coupled Codes; Reactor Physics and Transport Theory ◽

10.1115/icone22-30688 ◽

2014 ◽

Author(s):

Hirohide Kofuji ◽

Tetsuji Yano ◽

Munetaka Myochin ◽

Kanae Matsuyama ◽

Takeshi Okita ◽

...

Keyword(s):

Phosphate Glass ◽

Transition Metal Oxides ◽

Glass Matrix ◽

Glass Composition ◽

Processing System ◽

Iron Phosphate ◽

Waste Form ◽

High Level Waste ◽

Ongoing Research ◽

High Level

As part of ongoing research and development of nuclear waste disposal techniques suitable for the pyrochemical processing system [1], iron-phosphate glass was examined as an alternative waste form for high level waste generated from the electro-refining process [2]. To enhance the waste element content in the glass matrix and improve the durability of the waste form, optimization experiments of the glass composition were performed, and the effects of other additional transition metal oxides were determined. From the surface analysis of iron phosphate glass, a leaching mechanism was assumed for various elements contained in the glass matrix. We have selected suitable a glass composition for the treatment of radioactive waste generated from the spent electrolytes of pyrochemical processing.

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