Solidification of LiCl–Li2O oxide reduction salt into sodalite by a spark plasma sintering

The waste LiCl–Li 2 O oxide reduction salt was solidified and transformed into sodalite by the spark plasma sintering method. Compared with traditional solidification method, SPS operates at a lower pressure, lower temperature, shorter processing time, and without sintering additive. The SPS-solidified sodalite presents a low porosity of 0.37% and low leaching rates of 2.21 g m –2  d –1 for Cs, 3.05 × 10 –1  g m –2  d –1 for Ba, and 3.12 × 10 –1  g m –2  d –1 for Sr. Overall, the SPS is a promising method to solidify various waste OR salts.