Yimei Group Qinghai Yihai Energy Co., Ltd. is a wholly state-owned company established in Qinghai Province in June 2003 in response to the call of the country's western development.
The company is headquartered in Delingha, where the state capital of Haixi Mongolian and Tibetan Autonomous Prefecture is located, with more than 2,600 employees. The company has two open-pit mines and one mine, which are located in Muli Coalfield of Tianjun County and Dameigou Coalfield of Dachaidan Committee.
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1, coal mine open-pit mining
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, 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. Open-pit coal mining can cover several square kilometers. About 40% of the coal mines in the world adopt open-pit mining.
2. Underground mining of coal mines
Most coal seams are far from the surface, so it is impossible to use open-pit mining. Underground mining accounts for 60% of the world's coal production. The room column method is usually used to advance in the coal seam in the mine, and the mine is supported by beams and columns. * * * There are four main underground mining methods:
(1), longwall mining-coal mining face with a length exceeding 300 meters. A precision shearer moves left and right in the coal seam roadway. Loose coal falls into the scraper conveyor and moves out of the working face.
(2), continuous mining-using a machine with a tungsten carbide bit to scrape coal from the coal seam. Operating in the "room column method" system-working in a series of room areas of about 10 meters.
(3) Blasting mining-traditional mining method. Use explosives to break coal seams, and collect coal blocks and put them into tramcars or conveyor belts.
(4) Short-wall mining-using continuous mining machine. Similar to longwall mining, it has movable roof support.
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