Coal Types

Coal Types

Through observation of several compounds and elements that were shaped during coalification, there are generally a number of coal ranks, which are:

1. Peat/gambu), (C60H6O34) with characters:

  • Brown, materials are not yet compact
  • Has high water content
  • Has a very low solid carbon content
  • Has a very high fly carbon (ash) content
  • Easily oxidized
  • Producing a very low heat value

2. Lignit/ brown coa, (C70OH5O25 ) with characters:

  • Brownish
  • Materials are compacted, though very fragile
  • Has a very high water content
  • Has a low solid carbon content
  • Has a high ash content
  • Easily oxidized
  • Low heat value

3. Subbituminous (C75OH5O20) - Bituminous (C80OH5O15) with characters:

  • Black
  • Materials is compacted
  • Has a medium amount of water content
  • Has a medium solid carbon content
  • Has a medium ash content
  • Medium oxidizing character
  • Heating value produced in medium

4. Antrasit (C94OH3O3) with characters:

  • Glossy Black color
  • Material is compacted strong
  • Has a low water content
  • Has a high solid carbon content
  • Has a low ash content
  • Relatively hard to oxidize
  • Heating Value produced is high