The coal mine is introduced as follows:
It is an area where human beings exploit coal resources in rich coal mining areas, which are generally divided into underground coal mines and open-pit coal mines. When the coal seam is far away from the surface, it is generally chosen to dig tunnels underground for coal mining, which is an underground coal mine. When the coal seam is close to the surface, it is generally chosen to directly peel off the topsoil to dig coal. This is an open-pit coal mine.
Most coal mines in China belong to underground coal mines. The scope of coal mine includes a large area of ground, underground and related facilities. Coal mine is a reasonable space excavated by human beings when mining geological strata rich in coal, which usually includes roadway, adit, mining face and so on. Coal is the most important solid fuel and a combustible organic rock.
It is formed by lush plants growing in a certain geological age, gradually accumulating into thick layers in a suitable geological environment, buried in the bottom of the water or sediments, and formed by natural coalification in a long geological age.
Among all geological periods in the world, Carboniferous, Permian, Jurassic and Tertiary strata produce the most coal, which is an important coal-forming era. The carbon content of coal is generally 46 ~ 97%, which is brownish black with dull to metallic luster. According to the degree of coalification, coal can be divided into four categories: peat, lignite, bituminous coal and anthracite.
Coal mining is introduced as follows:
Coal became the main energy source in the industrial revolution in the18th century, and steam trains and steamboats began to become the main means of transportation in industrialized countries. At the same time, the steelmaking industry also needs a large number of coal mines. Natural gas is also needed for urban lighting, heating and cooking. Britain invented many underground coal mining technologies at the end of 18.
The purpose of coal mine is introduced as follows:
From the18th century to the1950s, coal was the main industrial and transportation energy in western countries. On the other hand, oil exploitation technology has been greatly developed in the early 20th century.