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Coal mining equipment
Coal

Coal is a combustible rock formed from the altered remains of ancient vegetation laid down in peat swamps. It is mainly composed of organic matter (compounds of carbon), moisture and minerals. The transition from peat to coal (coalification) occurs over millions of years as peat is buried and consolidated by the weight of overlying sediments. The top five hard coal producers are China, the USA, India, Australia and South Africa.

There are two primary methods of mining coal, surface mining and underground mining.

Surface mining

Surface mining also known as opencast, opencut mining or strip Mining. It is only economic when the coal seam is near the surface. The overburden of soil and rock is first broken up by explosives; it is then removed by draglines or by shovel and truck. Once the coal seam is exposed, it is drilled, fractured and systematically mined in strips. The coal is then loaded on to large trucks or conveyors for transport to either the coal preparation plant or direct to where it will be used.

Underground Mining

There are two main methods of underground mining: room-and-pillar and longwall mining.

Room & Pillar Mining

In room-and-pillar mining, coal deposits are mined by cutting a network of 'rooms' into the coal seam and leaving behind 'pillars' of coal to support the roof of the mine.

longwall mining

Another method, called longwall mining. This method involves pulling a cutting machine across a 400 to 600 foot long face (longwall) of the coal seam. This machine has a revolving cylinder with tungsten bits that shear off the coal.

Coal mining equipments

Coal processing includes coal crushing, washing and grinding

Coal crushing machine

Coal crushing machine is used to crush coal into small size. In coal mining industry, the usually used crushing machines are jaw crusher, impact crusher, cone crusher, hammer crusher and mobile coal crusher.

Coal washing machine

Coal washing machine is the important mining equipment.

Coal mill machine

Coal mill is used for grinding coal into powder, SBM supplies Coal ball grinding mill, raymond mill, vertical roller coal mill, high pressure grinding mill, trapezium mill, and ultrafine grinding mill for coal.