Lime :
- The word “lime” refers to products derived from heating limestone.
- It originates with its earliest use as building mortar and has the sense of “sticking or adhering“
- The rocks and minerals from which these materials are derived, typically limestone or chalk, are composed primarily of calcium carbonate (CaCO3).
Types of Lime:
- Quick Lime (CaO)
- Fat Lime
- Hydraulic Lime
- Hydrated Lime
- Lump Lime
- Milk Lime
Quick Lime (CaO) :
Pure lime, generally called quick lime, is a white oxide of calcium. Much of commercial quick lime, however, contains more or less magnesium oxide, which gives the product a brownish or grayish tinge. Quick lime is obtained after the calcination of limestone. It is also called caustic lime. It is capable of slaking with water and has no affinity for carbonic acid. The specific gravity of pure lime is about 3.40.
(Calcination is used to mean a thermal treatment process in the absence or limited supply of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition. A calciner is a steel cylinder that rotates inside a heated furnace and performs indirect high-temperature processing (550-1150 °C, or 1000-2100 °F) within a controlled atmosphere.)
(Calcination is used to mean a thermal treatment process in the absence or limited supply of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition. A calciner is a steel cylinder that rotates inside a heated furnace and performs indirect high-temperature processing (550-1150 °C, or 1000-2100 °F) within a controlled atmosphere.)
Fat Lime
has high calcium oxide component and, sets and hardens by the absorption of CO2 from atmosphere. These are manufactured by burning marble, white chalk, calcareous tufa, pure limestone, sea shell and coral.
Hydraulic Lime
contains small quantities of silica, alumina, iron oxide in chemical combination with calcium oxide component. These are produced from carboniferous limestones and magnesian limestone. It has the property to set and harden under water.
Hydrated Lime
When quick lime is finely crushed, slaked with a minimum amount of water, and screened or ground to form a fine homogeneous powder the product is called hydrated lime.
Lump Lime
is the quick-lime coming out of the kilns.
Milk Lime
is a thin pourable solution of slaked lime in water.
