Abstract: | The causticization behaviour of Na2CO3 with rock-salt type oxide, Mg2(1-x/(2+x) O (M = Al3+ and Fe3+, x = 0.2 and 0.33), produced by the thermal decomposition of hydrotalcite-like layered double hydroxide was investigated at 30–60°C. The degree of causticization increased with increasing the molar ratio of rock-salt type oxide]/Na2CO3] and increasing the temperature but decreased with increasing the initial concentration of Na2CO3. The causticization behaviour could be adequately described by the equation of anion exchange equilibria between CO32- and OH? for layered double hydroxide. |