the lime cycle

the lime cycle

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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
Calcium carbonate + heat calcium oxide + carbon
As a symbol equation this is
CaCO3 CaO + CO2
Slaking of calcium hydroxide by exothermic reaction
with water to produce lime putty or calcium hydroxide.
Quicklime + water slaked lime

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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.…read more


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