Two-step alkaline thorium dioxide precipitation A low waste method for highly sinterable ThO 2

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Two-step alkaline thorium dioxide precipitation A low waste method for highly sinterable ThO 2. / Wangle, Tadeáš; Peeters, Nand; Cautaerts, Niels; Delloye, Thierry; Cardinaels, Thomas; Vleugels, Jozef; Verwerft, Marc.

In: Journal of Nuclear Materials, Vol. 552, 152984, 02.04.2021, p. 1-10.

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@article{ca94d12a7eb1445aa33a0a1fd098d41c,
title = "Two-step alkaline thorium dioxide precipitation A low waste method for highly sinterable ThO 2",
abstract = "We precipitated thorium in a two-step process with ammonia and carbonates. In contrast to single step ammonia or carbonate precipitation, the two-step process precipitates > 99.9% of Th and removes > 99.5% of Ra alongside. Filterability is strongly affected by pH variations in the ammonia step, and under well- controlled conditions, the precipitated ThO 2 filters quickly and calcines to crystalline ThO 2 at low temper- atures. As-precipitated ThO 2 contains significant quantities of adsorbed H 2 O and CO 2 , which are removed during calcination. The calcination temperature greatly affects the green density of produced pellets, but for all calcination temperatures investigated, the sintered densities are in excess of 96% with grain sizes within the range applied for nuclear fuels at 10–16 µm.",
keywords = "ThO2, Permeability, Radium removal, Ammonia, Carbonates",
author = "Tade{\'a}{\v s} Wangle and Nand Peeters and Niels Cautaerts and Thierry Delloye and Thomas Cardinaels and Jozef Vleugels and Marc Verwerft",
note = "Score=10",
year = "2021",
month = apr,
day = "2",
doi = "10.1016/j.jnucmat.2021.152984",
language = "English",
volume = "552",
pages = "1--10",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Two-step alkaline thorium dioxide precipitation A low waste method for highly sinterable ThO 2

AU - Wangle, Tadeáš

AU - Peeters, Nand

AU - Cautaerts, Niels

AU - Delloye, Thierry

AU - Cardinaels, Thomas

AU - Vleugels, Jozef

AU - Verwerft, Marc

N1 - Score=10

PY - 2021/4/2

Y1 - 2021/4/2

N2 - We precipitated thorium in a two-step process with ammonia and carbonates. In contrast to single step ammonia or carbonate precipitation, the two-step process precipitates > 99.9% of Th and removes > 99.5% of Ra alongside. Filterability is strongly affected by pH variations in the ammonia step, and under well- controlled conditions, the precipitated ThO 2 filters quickly and calcines to crystalline ThO 2 at low temper- atures. As-precipitated ThO 2 contains significant quantities of adsorbed H 2 O and CO 2 , which are removed during calcination. The calcination temperature greatly affects the green density of produced pellets, but for all calcination temperatures investigated, the sintered densities are in excess of 96% with grain sizes within the range applied for nuclear fuels at 10–16 µm.

AB - We precipitated thorium in a two-step process with ammonia and carbonates. In contrast to single step ammonia or carbonate precipitation, the two-step process precipitates > 99.9% of Th and removes > 99.5% of Ra alongside. Filterability is strongly affected by pH variations in the ammonia step, and under well- controlled conditions, the precipitated ThO 2 filters quickly and calcines to crystalline ThO 2 at low temper- atures. As-precipitated ThO 2 contains significant quantities of adsorbed H 2 O and CO 2 , which are removed during calcination. The calcination temperature greatly affects the green density of produced pellets, but for all calcination temperatures investigated, the sintered densities are in excess of 96% with grain sizes within the range applied for nuclear fuels at 10–16 µm.

KW - ThO2

KW - Permeability

KW - Radium removal

KW - Ammonia

KW - Carbonates

UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/45837774

U2 - 10.1016/j.jnucmat.2021.152984

DO - 10.1016/j.jnucmat.2021.152984

M3 - Article

VL - 552

SP - 1

EP - 10

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

M1 - 152984

ER -

ID: 7203850