Limestone - reactions and uses

Flowchart showing reactions of limestone, and the uses of each stage

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Building industry to At power stations
Steel industry to Used to
make cement: limestone to remove acidic
remove acidic neutralise
heated with clay and flue gases such
impurities in iron and acidity in soil
then gypsum (CaSO4) as SO2
Limestone, Chalk, Marble
Calcium Carbonate
Heat strongly in a kiln
Thermal decomposition takes
CaCO3 --> CaO + CO2
Quicklime and Slaked Lime are
strong bases, and do not cost a
lot. So they are used to
Quicklime -Acidity in soils
Calcium Oxide, CaO -Acidic liquid wastes from
-Acidic gases from power stations
Add Water
Hydration Reaction takes place
CaO + H2O --> Ca(OH)2
Slaked Lime
Calcium Hydroxide, Ca


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