Coal gangue is a solid waste discharged from the coal mining process and coal washing process.
Coal gangue processing and production process
Comprehensive recycling of coal gangue will be an effective way to alleviate the shortage of resources. With the development of science and technology, the products of coal gangue recycling will also have breakthroughs and innovations, and create new value for the realization of the very large utilization of fly ash.
1.After being crushed by the crusher, it is used for power generation: it is mainly used for co-combustion of washed coal and washed gangue for power generation, and the calorific value per kilogram is generally 3500 kcal.
2.Method 2 of recovering coal and pyrite: recovering pyrite, washed mixed coal and medium coal from the jig used for coal preparation—plane shaker process.
3.Method 1 for recovering coal and pyrite: through a simple process, select good coal and low-quality coal respectively through screening, and at the same time pick out pyrite. The recovered coal can be used as fuel for power boilers, gangue can be used as building materials, and pyrite can be used as chemical raw materials.
4.Manufacture of building materials: Instead of clay as a raw material for making bricks, less fertile land can be dug.
Coal Gangue Grinding Mill
Whether the coal gangue is used for making bricks, recovering coal and pyrite, or making cement additives or supplying it to coal gangue power plants, the processing equipment usually used are jaw crushers, impact crushers, ultra-fine Micro powder mill, super-pressure trapezoidal mill, European version trapezoidal mill, vibrating screen, vibrating feeder, etc.
Investment prospects
A large number of piles of coal gangue will not only occupy the land and affect the ecological environment, the leaching water of gangue will pollute the surrounding soil and groundwater, and the coal gangue contains certain combustibles, which will spontaneously combust under suitable conditions and emit sulfur dioxide and nitrogen oxides. Harmful gases such as carbon oxides and soot pollute the atmospheric environment and affect the health of residents in mining areas. During the “Eleventh Five-Year Plan” period, China’s coal industry will vigorously develop a circular economy, focusing on the treatment and utilization of coal gangue, mine water and fly ash in accordance with the principles of reduction, reuse and recycling. In 2010, the comprehensive utilization of coal gangue exceeded 390 million tons, and the utilization rate reached over 70%. Among them, coal gangue and other low calorific value fuel power plants use 200 million tons per year, coal gangue bricks use 90 million tons; coal gangue reclamation, field construction, road construction and underground filling consume more than 100 million tons. 5 billion cubic meters of mine water are produced, 3.6 billion cubic meters are utilized, and the utilization rate reaches 70%. Protecting the environment is China’s basic national policy. With the continuous increase of national environmental protection law enforcement and the improvement of people’s requirements for environmental quality, it has become more and more prominent to solve the problem of environmental pollution by coal gangue. ingredients, turning waste into treasure, and an effective way to solve pollution.
The main purpose of coal gangue
(1) Recovery of coal and pyrite
Through a simple process, the good coal is washed out of the coal gangue, the inferior coal is selected from the gangue, and the pyrite is selected at the same time. Or recover pyrite, washed and mixed coal and medium coal from the jig used for coal preparation – the plane shaker process. The recovered coal can be used as fuel for power boilers, gangue can be used as building materials, and pyrite can be used as chemical raw materials.
(2) For power generation
Mainly use the co-firing of washed coal and washed gangue to generate electricity. China has used boiling furnaces to burn a mixture of washed coal and gangue (with a calorific value of about 2,000 kcal per kilogram) to generate electricity. Slag can be used to produce slag bricks and slag cement.
(3) Manufacture of building materials
Instead of clay as a raw material for making bricks, less fertile land can be dug. When burning bricks, the combustible material of coal gangue itself can be used to save coal.
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