Discussion
Calcination is the reaction in which
Answer: D
Correct answer: calcium carbonate decomposes to lime and carbon dioxide
\[ \mathrm{CaCO_3} \rightarrow \mathrm{CaO} + \mathrm{CO_2}. \] The reaction absorbs a great deal of heat and proceeds from about 800 degrees, which is why it dominates the plant’s energy consumption. The combination of lime with silica to form the silicates is a separate, later stage at a much higher temperature.
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