17 Carbonates

CaCO3

CaCO3

________ is also used in treating excess acidity in soils and lakes where it is often preferred to lime because it does not make the water excessively alkaline.

Limestone

________ consists mainly of calcium carbonate, CaCO3.

lime reacts

The ________ with silica impurities in the iron ore to form calcium silicate, which floats to the top of the molten iron as slag and is removed:

Lime

________ which is calcium oxide, CaO, is manufactured from calcium carbonate by thermal decomposition:

Cement

________ is a hardened, interlocked structure of calcium aluminate (Ca (AlO2) 2 and calcium silicate (CaSiO3)

Limewater

________ is a solution of calcium hydroxide in water, hence it is weakly alkaline.

Flue gas desulphurisation

________ involves spraying jets of slaked lime slurry into acidic sulfur dioxide emissions to reduce pollution by neutralising these gases before they leave the factory chimneys.

CO2

The ________ produced is reduced to carbon monoxide, CO, by coke (almost pure carbon) where it acts as a reducing agent transforming iron ore into iron:

calcium sulfate

Once heated, ________ and water are added which produce cement.

Limestone

________ (calcium carbonate) is used in the manufacture of iron and cement.

Cement

________ is manufactured by heating a mixture of powdered limestone and clay in a rotary kiln.

lime

Slaked ________ (calcium hydroxide) is used in treating acidic soils and neutralising acidic industrial wasted products.