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The main use of calcium carbonate is in the construction industry, either as a building material or limestone aggregate for roadbuilding or as an ingredient of cement or as the starting material for the preparation of builder's lime by burning in a kiln. However, due to weathering mainly caused by acid rain, calcium carbonate (in limestone form) is no longer used for building purposes on its own, and only as a raw/primary substance for building materials.
Calcium carbonate is also used in the purification of
iron from iron orein a blast furnace. The carbonate is calcined
in situ to give calcium oxide, which forms a slag with
various impurities present, and separates from the purified
iron
