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The lime cycle


The manufacture and setting of lime is chemically defined as
three separate processes:
Burning of calcium carbonate by which carbon dioxide
gas is driven off at temperatures of about 800 degrees
centigrade to produce lump lime or calcium oxide.


Limestone + heat quicklime + carbon dioxide
or…

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Or
Calcium oxide + water calcium hydroxide


As a symbol equation this is



CaO + H2O Ca(OH)2


Setting or carbonation of calcium hydroxide by slow
reaction with carbon dioxide in the air to produce
calcium carbonate.


Calcium hydroxide + carbon dioxide calcium carbonate


As a symbol equation this is


Ca(OH)2…

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