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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

Page 2

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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



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