The coal mine paste filling process is a green mining method used in the mining process, whose core is to fill specific paste materials into the goaf to improve the recovery rate of mineral resources and reduce environmental problems such as surface subsidence. The following is a detailed introduction to the process:

The main process of coal mine paste filling is to process coal gangue, fly ash, slag, inferior soil, urban solid waste and other materials near the coal mine into a certain graded aggregate, mix it with bonding materials and water in a certain proportion, and make a paste like slurry (paste) without critical flow rate and dehydration, and then transport it to the underground through pipelines to fill the goaf in real time. This process not only effectively supports the ore body and prevents mining accidents, but also reduces waste emissions, achieving resource recycling and environmental protection goals.

Specifically, the coal mine paste filling process includes the following key steps:

Material preparation and processing: Collect solid waste materials such as coal gangue and fly ash near coal mines, and convert them into suitable aggregates for filling through crushing, screening, and other processing techniques.
Mixing ratio: Mix processed aggregates with cementitious materials and water in a certain proportion, and use mixing equipment to make a paste like slurry. During this process, it is necessary to optimize the strength parameters of the filling material to ensure that the paste has good fluidity and solidification performance.
Pipeline transportation: Using the pressure of the filling pump or the gravity of the paste itself, the paste is transported to the underground goaf through pipelines. During this process, it is necessary to determine the rheological properties, critical flow rate, and other core parameters of the paste pipeline pumping to ensure that the paste can be uniformly and stably filled into the goaf 45.
Real time filling: During the mining process, as the ore body is mined, the paste is promptly filled into the goaf to control rock movement and ground subsidence.
The application of coal mine paste filling technology can effectively improve the recovery rate of mineral resources, reduce environmental problems such as surface subsidence, and achieve the resource utilization of solid waste. This process embodies the concept of green mining and sustainable development, and is of great significance for promoting the sustainable development of the coal industry.