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Thermal decomposition of calcium carbonate.

In general, we heat $\ce{CaCO3}$ to temperature of approximately 825°C it decomposes into calcium oxide and liberates carbon dioxide gas:*

$$\ce{CaCO3} \overset{825\ ^\circ \text{C}}{\ce{ ->}}\ce{CaO + CO2}$$

Is it possible to heat the calcium carbonate at temperatures below 825 degrees Celsius.

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  • $\begingroup$ Do you mean "Is it possible to achieve the same effect heating the calcium carbonate at temperatures below 825 degrees Celsius?" $\endgroup$
    – G M
    Commented Feb 10, 2014 at 14:54
  • $\begingroup$ Yes, complete calcite at temperatures below 825 degrees Celsius. $\endgroup$
    – marco2008
    Commented Feb 10, 2014 at 15:58

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Pump a hard vacuum and calcium carbonate will calcine at a lower temperature. 825°C is about one atmosphere of carbon dioxide at equilibrium. Thermodynamics proposes, kinetics disposes - finely ground goes faster than bulk.

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  • $\begingroup$ In the US we activate molecular sieves in a vacuum oven around 150-200 C. In Canada, they use porcelain bowl and a Meeker burner underneath. If nanostructure is important, go cooler. $\endgroup$
    – Uncle Al
    Commented Feb 10, 2014 at 23:10

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