12. Carbonates

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Notes on Carbonates

 

Limestone (calcium carbonate - CaCO3) is used as a building material and in the manufacture of:

  • Iron – in the blast furnace

  • Glass – heated with sand and soda (sodium carbonate)

  • Cement – heated with clay in a kiln

  • Concrete/ mortar – mixed with sand and water (and crushed rock)

  • Lime – thermal decomposition

 

Lime/ quicklime (calcium oxide - CaO) is made from limestone (calcium carbonate – CaCO3) by thermal decomposition.

 

Calcium carbonate CaCO3 + heat -----> calcium

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