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Abstract:
This paper reports the sintering behavior of synthetic inorganic
carbonates chemically identical to barytocalcite (BaCa(CO3)(2), 8.1 wt.%
C), kutnahorite (CaMn(CO3)(2), 11.1 mass% C) and rhodochrosite (MnCO3,
10.5 wt.% C) for C-14 immobilization. As carbonates are time temperature
dependently subjected to decarbonation due to the loss of carbon
dioxide, spark plasma sintering (SPS) appeared to be the most suitable
method for the study. It was shown that densification and decarbonation
are overlapping phenomena for kutnahorite and rhodochrosite, lowering
the carbon final content, whereas barytocalcite was successfully
densified without carbon loss. Barytocalcite pellets of 30 mm diameter
with a relative density of 92% and a carbon content of 7.78 +/- 0.28
wt.% were obtained. The study highlighted the role of sintering pressure
in carbon dioxide volatilization. (C) 2014 Elsevier Ltd. All rights
reserved.