bituminous coal
Bituminous coal (Greek: aνθρακίτης, is a relatively soft coal that contains tar-like asphalt. The quality is better than lignite but below anthracite. It is usually brown and some are dark brown and often have bright-dark material. Bituminous coal is the product of lignite by high pressure metamorphism, the basic components are coal micro-components, vitrinite, shell fuselage, etc. Carbon in the carbon accounted for 60-80%; other components are water, air, hydrogen, sulfur and other The burning calorific value of bituminous coal is 24-35 MJ / kg. Bituminous coal is named after the large amount of smoke. The burning air pollution is serious and the sulfur in the flue gas is easy to cause disease. The average density of the coal seam is 1346 kg / m³. The bulk density of bituminous coal is 833 kg / m³.