Coal gangue is solid waste discharged from the process of coal mining and washing. It is low carbon dark gray rock that is much harder and associated with coal seams.
Coal gangue comprehensive recycling will be an effective way to alleviate the shortage of resources. With the development of science and technology, gangue recycling of products will be a breakthrough and innovation, and to create new value for the maximum utilization of fly ash.
Coal gangue will be used for electricity production after primary crushing by crusher: mainly co-fire washed medium coal and washed gangue to generate electricity. The generally heating value is 3,500 kcal per kilogram.
Recycling coal and pyrite Method Two: recycle pyrite, washed mixing coal and medium coal from coal preparation jigger- shaker flow plane.
Recycling coal and pyrite Method One: By simple technology, to wash and elect high quality coal from coal gangue, at the same time, screen out low-quality coal and pick out pyrite. Or recycle pyrite, washed mixing coal and medium coal from coal preparation jigger- shaker flow plane. The recycled coal can be used for power boiler fuel, washed gangue can be used for construction materials, and pyrite can be used as chemical raw materials.
To produce building materials: Using coal gangue for brick production instead of clay as a raw material, by this way, can reduce fertile land dig
No matter the gangue used for brick production, coal and pyrite recycling, or making cement additive and supplying to coal gangue power plant, the normal used processing equipments are jaw crusher, impact crusher, SCM Ultra fine grinding mill, overpressure trapezium mill, MTW European type Trapezoid mill, vibrating screen, vibrating feeder and so on.
This series mills are mainly applied to the powder processing of mineral products in the industries of metallurgy, construction materials, chemical, and minging etc.
SCM series ultra fine mill is widely used in the industries of paining, paper making, pigment, rubber, filler, cosmetic etc.
A large number of stacked coal gangue, not only pressure occupied land, ecological impacts, waste rock leaching water surrounding soil and groundwater pollution, and coal gangue contains some combustible material, spontaneous combustion occurs under suitable conditions, emissions of sulfur dioxide, nitrogen oxides, carbon oxides and soot and other harmful gases pollute the atmosphere, affect the health of residents around the mining area. “Eleventh Five-Year” period, China’s coal industry will vigorously develop the circular economy, in accordance with the reduction, reuse, recycling principles, focusing on governance and using of coal gangue, mine water and fly ash. In 2010, more than 390 million tons of coal gangue was comprehensive utilization, utilization rate of over 70%. Among them, coal gangue and other low calorific value fuels was on the use of 200 million tons by power plant, 90 million tons of coal gangue bricks were used; road construction, underground coal waste reclamation and reclaiming land consumptive more than 100 million tons. Produce 5 billion cubic meters of mine water, and 3.6 billion cubic meters mine water was been used, utilization rate of 70%. Environmental protection is China’s basic national policy, with the state environmental protection law enforcement continued to increase people’s awareness of improving environmental quality, to solve the problem of coal gangue pollution has become increasingly prominent, coal gangue power generation is an effective heat full usage of coal gangue ingredients and turning waste into treasure, it is an effective way to solve pollution.
Main application of coal gangue
(1) To recycle coal and pyrite By simple technology, to wash and elect high quality coal from coal gangue, at the same time, screen out low-quality coal and pick out pyrite. Or recycle pyrite, washed mixing coal and medium coal from coal preparation jigger- shaker flow plane. The recycled coal can be used for power boiler fuel, washed gangue can be used for construction materials, and pyrite can be used as chemical raw materials. (2) For power generation Producing electricity mainly by co-firing medium coal and washed gangue. China has produced electricity by burning mixture medium coal and washed gangue in boiling furnace (heating value about 2,000 kcal per kilogram). Then, slag can be used for slag brick and slag cement production. (3) To produce building materials Using coal gangue for brick production instead of clay as a raw material, by this way, can reduce fertile land dig. By making use of coal gangue own fuel, you can save coal on the process of brick burning.
Mainly scope of application