LIGNITE

Definition

The poorest grade of coal, containing up to 45% carbon and with a high moisture content.

Agricultural Uses

In the process of coal formation, there are various intermediate stages. These stages are referred to as the ranks of coal. Lignite or brown coal is one such rank.
Lignite is soft, brown and high in moisture content (35 to 40%). It weathers quickly, ignites spontaneously and has a low calorific value.
Coals are analyzed in two ways. The ultimate analysis determines the total percentage of elements present in coal. The proximate analysis gives an empirical estimate of the amounts of moisture, ash, volatile matter and fixed carbon in coal.