Coal Gangue Clean Processing and Utilization Technology
Coal gangue is the solid waste discharged from coal mine during the coal exploitation, coal washing, and combustion processes. The production of coal gangue and associated social costs in China is huge due to the sheer amount of coal gangue produced. As a result, coal gangue clean processing and utilization has become an important measure to accelerate the development of the industry, improve the resource utilization efficiency, and reduce environmental damage in China.
In recent years, with the continuous implementation of the environmental quality standards, more and more attention has been paid to researches and applications of clean and effective processing and utilization for coal gangue. In order to increase the value of coal gangue, researchers in China have developed a variety of technologies to process and utilize coal gangue. These include technologies such as coal gangue comprehensive utilization, coal gangue sintering, and chemically activated coal gangue.
Comprehensive utilization technologies use coal gangue as one of the raw materials to produce a variety of products. This includes construction materials such as hollow bricks, insulation bricks, wallboards, and road coatings. Other products are wall building blocks, civil bricks, carbonaceous materials, and other unburned products. These products can be used as aggregate material and can also be used in the production of environmental protection building materials. Moreover, coal gangue can be mixed with other materials to produce fly ash, slag, and ultra-high strength bacteria cement.
In the sintering process, the heat generated by coal combustion is used to sinter coal gangue, transforming it from its original amorphous state into a crystalline state. This results in the formation of an improved material that is structurally stronger and denser, making it suitable for use in building materials and ceramic products.
Chemically activated coal gangue is a type of coal gangue that has been chemically modified, resulting in materials suitable for use in industries such as metallurgy and the manufacturing of building materials. For example, coal gangue can be used to improve the intensity and abrasion resistance of refractory materials. It can also be used in the manufacture of high-performance ceramic products.
In addition to the abovementioned applications, researchers are also exploring technologies to convert coal gangue into useful energy sources. One example is the production of low-calorific gas through gasification. This gas is then used as an energy source in areas with limited resources.
In conclusion, coal gangue clean processing and utilization technologies are becoming increasingly important as China becomes more concerned about resource utilization and environmental protection. Through the implementation of comprehensive utilization, sintering and chemically activated coal gangue technologies, coal gangue can be converted into alternative energy sources, building materials, and other products, making it a valuable resource for the future.
