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The solubility of oxide ions in LiCl-based and CaCl 2 -based melts was estimated by double-tracer technique as part of the CO 2 capture and conversion process. The solubility of oxide ions in pure LiCl and CaCl 2 is 10.6 mol% at 600°C and 12.5 mol% at 800°C, respectively. The solubility of oxide ions increases with escalating temperature. The solubility of oxide ions encounters serious decrease when NaCl or KCl is added to the melts. In the case of LiCl-CaCl 2 eutectic, the solubility of CaO firstly descends and then ascends with the increasing mole fraction of CaCl 2 . Intriguingly, the excess addition of Li 2 O into alkali carbonates leads to a floating layer while, on the contrary, the addition of Li 2 O into chlorides gives a Li 2 O precipitate. It is deduced that the Li 2 O solubility in Li-Na-K carbonates (43.5:31.5:25 in molar ratio) is slightly lower than 5 mol% at 500°C.
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Ge et al. (2016) studied this question.
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