What is low grade coal?


What are the 4 types of coal?

Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.

What is meant by grade of coal?

The gradation of non-coking coal is based on Gross Calorific Value (GCV), the gradation of coking coal is based on ash content and for semi coking /weakly coking coal it is based on ash plus moisture content, as in vogue as per notification.

Which is the poorest quality of coal?


  • Peat, a precursor of coal.
  • Lignite, or brown coal, the lowest rank of coal, most harmful to health, used almost exclusively as fuel for electric power generation.

Is coke obtained from coal tar?

Coal tar: It is obtained as a by-product in the process of making coke. Though its colour is the same as coke, tar is a highly viscous liquid.

Coal And Its By – Products: Coke, Tar And Coal Gas.

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What is the formula of coal?

The chemical formula of coal is reported as: C135H96O9NS. Coal is usually taken as 85% carbon based on dry mass.

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How is coal GCV calculated?

The best equation has the following form: GCV= 25.284 (M) + 30.572 (Ash) + 62.127 (VM) + 138.117 (FC) – 2890.095. The result is in agree with previous work that equation involving four independent variables i.e. moisture (M), ash, volatile matter (VM) and fixed carbon (FC) provides the most accurate estimation of GCV.

What type of coal is used in Singareni?

‘Coal’ includes anthracite, bituminous coal, lignite, peat and any other form of carbonaceous matter sold as coal and also cake. 2. ‘Coal Controller’ means the person appointed by the central Government to hold the post of coal controller and include the joint coal controller and Deputy coal controller.