Study of the chemical durability of a hollandite mineral leached in both static and dynamic conditions

Year 2019, Volume: 2 Issue: 2, 85 - 92, 30.06.2019

Fairouz Aouchiche Nour-el-hayet Kamel , Dalila Moudir Yasmina Mouheb Soumia Kamariz

https://doi.org/10.35208/ert.453417

Abstract

Hollandite is a ceramic
used for the confinement of cesium. In this study, we synthesized a hollandite
of chemical formula: K_0.28Ba_0.76Ti_7.10Cu_0.9O₁₆,
where K simulates cesium. This new formulation of a copper-containing hollandite
was synthesized by a double calcination; the first one at 950°C during 18 h,
and the second one at 1000°C during 6 h. The mineral was identified by X-ray
diffraction. Various leaching tests are employed in order to assess the
chemical durability of this mineral. The static test MCC1 gave elemental leaching
rates of: 7.097 10^-5 g cm^-2 d^-1 for Cu, 5.592
10^-7 g cm^-2 d^-1 for Ti and 4.630 10^-6
g cm^-2 d^-1 for Ba, after 42 days. This corresponds to
dissolved elements percentages of: 5.7% Cu, 0.0007% Ti and 0.2% Ba. The
equivalent amount of dissolved K is 0.0029%. A static test in the presence of a
clay barrier, gave the best leaching rates (at 42^nd day, NR<3.704
10^-7 g cm^-2 d^-1 of Cu, and <1.11 10^-9
g cm^-2 d^-1 of Ti and <3.67 10^-9 g cm^-2
d^-1 of Ba). This corresponds to 0.030% of Cu, 10^-6 % of
Ti and 0.002 % of Ba, and about 0.002% of K. In MCC5 dynamic test, the leaching
rates of Cu, Ti and Ba reached 2 10^-6, 1,468 10^-7, and
1.084 10^-5 g cm^-2 d^-1, respectively,
corresponding to 0.028% Cu, 0.0003% Ti, and 0.082% Ba, after seven days. The
estimated K leaching rate is 3.613 10^-6 g cm^-2 d^-1,
ie 0.082% K dissolved in the leachate. There is no passivation layer formation.
The MCC5 test is considered as a dissolution test.

Keywords

Hollandite, Cesium, Leaching, MCC1, MCC5

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