Limestone or calcium carbonate (CaCO3) exists as a natural stone throughout the world. Limestone in its natural form is very slow reacting therefore, it has a limited use
The most significant use of pulverized limestone is in agriculture in a finely ground and dry form or in flue gas desulphurization in slurry form
The use of lime in carbonate form is beyond the scope of this paper
We will concentrate on lime as calcium oxide and calcium hydroxide
In most pollution control applications lime is used as calcium hydroxide
To manufacture calcium hydroxide the limestone calcium carbonate must be converted to calcium oxide and the calcium oxide then converted to calcium hydroxide
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