Coal mined from the point of view, China's annual production of 100 million tons of coal, 14 million tons of emissions from waste rock; from the coal washing and processing point of view, each washing 100 million tons of coking coal emissions gangue of 20 million tons per wash 100 million tons power coal, emissions from waste rock volume of 15 million tons. 2005 104 500 000 000 t, all kinds of domestic coal production and coal, 38.5 billion tons of coal washing, emissions from waste rock volume 19-20 billion tons.Thus, the existing waste dump of the national state-owned coal mine more than 1,500, the amount of deposited more than 3 billion tons (accounting for more than 40% of the total emissions of industrial solid waste).
Gangue of a large number of stacked, not only pressure to account for land, ecological impacts, waste rock leaching water will contaminate the surrounding soil and groundwater, and gangue contains a certain amount of combustible materials to ignite under appropriate conditions, emissions of sulfur dioxide, nitrogen oxides , carbon oxides and soot and other harmful gases pollute the atmosphere environment, affecting the health of residents of the mining area. Such as Benxi mine accidents have occurred due to the spontaneous combustion of waste result in poisoning deaths.  
Environmental protection is China's basic national policy, national environmental law enforcement continue to increase, the people on the improvement of environmental quality requirements and to solve the gangue pollute the environment becomes more and more prominent gangue power generation is to take full advantage of gangue effective thermal composition, turning waste into treasure, and effective way to solve the pollution.  
China's coal enterprises have more than 120 coal gangue power plant, installed capacity of 1.84 million kW; annual generation capacity of 8.7 billion kWh, coal gangue brick factory 129, the annual production capacity of 3 billion (equivalent to the standard brick); gangue and pulverized coal 163 gray cement plant, with an annual production capacity of 12.5 million tons.

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