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As China's main energy source, coal plays an extremely important role in social and economic development. The development and utilization of coal not only has a huge impact on the social economy, but also has a major impact on the environment. Coal gangue and coal bed methane are the main wastes produced during the development of coal and have long been considered harmful by the coal industry. Material and catastrophic gases. Coal gangue is a solid waste that is discharged during the excavation, extraction and washing of coal. Coal gangue was abandoned and occupied a large area of ​​land. The leaching or leaching of sulphides in coal gangue can pollute the atmosphere, farmland and water bodies. Dangshan Mountain also spontaneously ignites a fire, or collapses in the rainy season, causing river disasters. China has accumulated more than 1 billion tons of coal gangue and will discharge 100 million tons of coal gangue each year.
In the past two decades, the coal sector has made many explorations and production tests in the development and utilization of coal gangue and coal bed methane, and has achieved a number of achievements. Practice has proved that as long as we change our concepts, strengthen scientific research, and pay attention to development in accordance with local conditions, the secondary use of mineral resources in the coal production process is not only completely feasible, but also has great potential; it can not only harm the benefits, turn waste into treasure, but also save Energy, and access to major social and economic benefits.
First, coal gangue can be used to recover coal and pyrite. Through a simple process, good coal is washed out from the coal gangue, and the inferior coal is selected from the coal gangue and the pyrite is sorted out at the same time. Or recover pyrite, washed coal, and medium coal from the jig shaker for the coal preparation process. The recovered coal can be used as fuel for power boilers, washing can be used as building materials, and pyrite can be used as chemical raw materials.
Second, coal gangue can be used for power generation, mainly using coal washing and washing and co-firing to generate electricity. China has used a boiling furnace to combust and wash coal and wash the mixture to generate electricity. Slag can produce slag bricks and slag cement. The mixture of medium coal and vermiculite used generally has a calorific value of 3,500 calories per kilogram; when the fire is insufficient, heavy oil is used to support combustion. The Federal Republic of Germany and the Netherlands have built coal mines for their own use of power plants and coal preparation plants to generate electricity from coal, coal slime and coal gangue.
Third, coal gangue can be used to make building materials, instead of clay as a raw material for bricks, you can dig less fertile land. When bricks are burned, coal can be saved by using combustibles of coal gangue itself. Coal gangue can be partially or completely replaced by a clay superfine mill for the production of ordinary cement. Spontaneously combusted or artificially burned coal gangue, with a certain activity, can be used as the active mixed material of cement to produce ordinary Portland cement (less than 20%), pozzolanic cement and less clinker cement. It can also be directly mixed with lime and gypsum with appropriate proportions to grind into cement without clinker. It can be used as cementing material to make concrete block or concrete hollow block with boiling slag as aggregate or with stones and boiling slag as coarse and fine aggregate. Blocks and other building materials.
On the basis of ascertaining the nature of coal gangue, treat it differently and make the best use of it, and combine all kinds of utilization methods to form a certain scale of development and comprehensive utilization system, so as to obtain the best economic benefits. However, no matter which way coal gangue is used, the final coal gangue is classified by super-pressure trapezoidal mill, ultra-fine powder mill, European trapezoidal mill, high-pressure suspending mill and other milling equipment, and comprehensive grinding Processed.
Shanghai Shibang Machine Co., Ltd. developed the MTM ladder mill, SCM ultra-fine powder mill, YGM Raymond mill, MXB free-style hem mill, and LM vertical mill using the characteristics of coal gangue , MTW European trapezoidal mill, Raymond Mill, trapezoidal mill, medium speed mill, ultra fine grinding, coarse powder mill, coarse grinding mill, free hem mill, vertical mill, European mill, crusher, smash Equipment, mills, pulverizers, milling equipment, milling machinery and other high-level milling machinery products can effectively prevent coal powder pollution, energy saving and environmental protection, to achieve dust-free operation of the workshop, SBMG widely used in coal Meteorite, recycling the waste, strengthened Sinbon's position and popularity in the industry, and benefited many customers, and was highly praised and praised by customers!
With the continuous deepening of the reform of the economic system and the healthy and rapid development of China’s industry and agriculture, mining machinery and equipment companies are increasingly focusing on the research, development, and production of high-efficiency, energy-saving and environmentally-friendly equipment, and are adopting long-term At the same time as the design principles of life, low energy consumption, and weight reduction, mining machinery and equipment companies are increasingly paying attention to secondary development and utilization of mine waste and other resources.
May 23, 2021