Manufacture and uses of Lime .
Limestone is added at the top , and quicklime is removed from the bottom in a continuous process .
The same reaction occurs in the Blast Furnace . The reaction is highly exothermic . Slaked lime is used to reduce the acidity of lakes and soils , see Acid Rain . It acts faster than powdered limestone but is more expensive . Slaked lime dissolves a little in water to form lime water .