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Mastering the Commodities Markets by Francesca Taylor

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RANGE OF COALS

No two types of coal are exactly alike; heating value, ash melting temperature, sulphur and other impurities, mechanical strength and many other chemical and physical properties all need to be considered. Coal is classified based on its properties and characteristics:

  • Peat;
  • Lignite;
  • Sub-bituminous coal;
  • Bituminous coal;
  • Anthracite.

Each grade reflects the response of coal deposits to increasing temperature and pressure. The carbon content of coal supplies most of its heating value, but other factors also influence the amount of energy it contains per ‘unit of weight’. The amount of energy in coal is usually expressed in British thermal units per pound. A Btu is the amount of heat required to raise the temperature of one pound ...

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