What is the function of coal mine and what is its use?

Coal used for coking can produce coal tar and ammonia water. Coke is an important raw material for ironmaking. Coal tar can extract many important industrial compounds.

Natural gas is made from naphtha extracted from crude oil and then refined. Coal can also be directly gasified to generate water gas, which can be directly used as clean fuel.

When the coal seam is close to the surface, it is more economical to use open-pit mining. The soil above the coal seam is called topsoil. Bury explosives in undeveloped topsoil area, and then use excavators, excavators, trucks and other equipment to remove topsoil. The topsoil was filled into the previously mined mine.

After the topsoil is removed, the coal seam will be exposed; At this time, the coal is drilled or blasted, and the coal is transported to the coal preparation plant by truck for further treatment. Open-pit mining can obtain a larger proportion of coal mines than underground mining because more mining areas are used.

Extended data:

Due to the discharge of a large amount of mine water in the process of coal mining, the groundwater level drops, resulting in the decline of surface water.

Due to the large amount of underground water pumped out from coal mines, the bearing capacity of the upper and lower floors of the mines decreased, and most of the small kiln coal wells did not take preventive measures such as reserving coal pillars during mining. Some Xiaoyao coal mines even dig and destroy the reserved coal pillars of state-owned coal mines at will, resulting in stratum dislocation and surface subsidence.

Coal seams are often accompanied by gas (methane, etc. ). Gas is easy to cause explosion accidents. Therefore, when working in a closed space, it is necessary to monitor the gas concentration frequently. If there is a certain concentration of dust in the gas, it may also cause an explosion because of Mars. The dust volume is small, but the relative proportion of the surface is large. If there is enough oxygen in the surrounding air, it will be very sensitive to the combustion reaction.

Baidu encyclopedia-coal mine

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