Underground Coal Mining Process
Underground mining for coal is conducted by either room and pillar mining or longwall mining. Depending on years’ abundant production experience and high technology, SBM has produced the advanced and high technology underground coal mining processing plant machine for the customers.
Coal mining process machine
To make best use of the coal, it is very necessary to know the coal mining process plant. The coal mining process starts with the crushing equipment. With the help of vibrating feeder, the coal raw materials will taken into jaw crusher for the first crushing process. The big block coal will be crushed into smaller size. Then the cone crusher or impact crusher will be used for the secondary crushing process. The crushed materials will be further crushed. If necessary, the grinding machine will be used to grind the coal into fine or ultrafine size. To eliminate the undesired materials involved in coal, vibrating screen will be used to separate the impurities. After the crushing and grinding process, beneficiation process will play great role. The classifier is mainly to remove the ash in the production process. In a heavy-media washing plant, all the cleaning is done by flotation in a medium of selected specific gravity, maintained by a dispersion of finely ground magnetite in water. With the help of dryer, you can get the clean coal.
Underground coal mining process
Room and pillar mining leaves pillars, or blocks, of coal in the mine to support the roof. In longwall mining the roof is allowed to collapse in a planned sequence. More coal is mined during longwall mining. Longwall mining removes more coal than room and pillar mining. Large panels of coal are extracted. The panels are 750 to 1,000 feet wide. The continuous miner cuts tunnels 18 to 20 feet wide. The longwall machine has large shields that support the roof and protect the miners during mining.