Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity. It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning).
What are the physical characteristics of coal?
The porosity also affects the physical and chemical properties of coal. The surface and body of coal are full of holes composed of organic matter and minerals, and coal is a porous solid substance with different pore size distributions; micropores are the main type of pore.
What is the texture of coal?
The texture of anthracite coal (black coal) is rough in that it is a rock, but it has a smooth, almost slippery quality as well. This may be due to very fine crystal formation within the coal, or it may be because of the hydrocarbon molecular formula that comprises coal.
What is a property of coal?
An important property of coal is its reflectivity (or reflectance)—i.e., its ability to reflect light. … The maximum generation of liquid petroleum occurs during the development of high-volatile bituminous coals (in the reflectivity range from roughly 0.5 to about 1.3).
What are the 4 types of coal?
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite.
Which is the best quality of coal?
Anthracite: The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter.
What is the Colour of coal?
Fresh coal is a jet-black rock that is noticably less dense than most other rocks. In the field, however, weathering often gives the coal a greyish, yellowish, or rust-colored coloring.
What are the characteristics and uses of coal?
Coal is black in colour and hard as stone. It is one of the fuels use to cook food. Earlier it was used in railway engines to produce steam to run the engine. It is used as fuel in thermal power plants to produce electricity and in various other industries.18 мая 2018 г.
What are the contents of coal?
Sinjai coal: moisture content: 10.09%, ash: 52.41%, volatile matter: 23.54%, fixed carbon: 13.96%, carbon content: 24.37%, sulfur content: 0.272% and calorific value: 3941.21 cal/gram.
What type of rock is coal found in?
Is coal a rock or mineral?
What’s the deal with coal? It’s classified as an organic sedimentary rock, but rocks are combinations of minerals, and minerals are inorganic. Coal is made of decomposed plants, which are organic.
Which rock contains coal?
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen.
What is the chemical properties of coal?
4.1 Elemental Composition of Coal. The organic matter in coal consists mainly of carbon, hydrogen, oxygen, nitrogen, sulfur, and some other elements. Carbon, hydrogen, and oxygen account for more than 95 % of the organic matter in coal.
What are the types of coal analysis?
Ultimate analysis: determines amounts of the major elements in coal: carbon, hydrogen, nitrogen, sulfur, oxygen. Vitrinite reflectance (Ro): determines the relative rank of coal. Volatile matter (part of proximate analysis): determines the amount of nonwater gases released by combustion of a sample.