This work focuses on the reprocessability of metallic 92Mo and ceramic MgO, which is under investigation
for (Pu,MA)-oxide (MA = minor actinide) fuel within a metallic 92Mo matrix (CERMET) and a ceramic
MgO matrix (CERCER). Magnesium oxide and molybdenum reference samples have been fabricated by powder
metallurgy. The dissolution of the matrices was studied as a function of HNO3 concentration (1–7 mol/L)
and temperature (25–90°C). The rate of dissolution of magnesium oxide and metallic molybdenum increased
with temperature. While the MgO rate was independent of the acid concentration (1–7 mol/L), the rate of dissolution
of Mo increased with acid concentration. However, the dissolution of Mo at high temperatures and
nitric acid concentrations was accompanied by precipitation of MoO3. The extraction of uranium, americium,
and europium in the presence of macro amounts of Mo and Mg was studied by three different extraction agents:
tri-n-butylphosphate (TBP), N,N'-dimethyl-N,N'-dioctylhexylethoxymalonamide (DMDOHEMA), and N,N,N’,N’-
-tetraoctyldiglycolamide (TODGA). With TBP no extraction of Mo and Mg occurred. Both matrix materials are
partly extracted by DMDOHEMA. Magnesium is not extracted by TODGA (D < 0.1), but a weak extraction
of Mo is observed at low Mo concentration.
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