The material is ground in the ball mill for a certain period of time, and then the 80mesh qualified powder is separated by a classifier and collected. The ball mill has the advantages of strong adaptability to materials, stable product quality and simple operation. However, it also has the disadvantages of high energy consumption, low production efficiency and large floor area.
Vertical roller mill is a new type of efficient milling equipment, which is gradually replacing ball mill in large-scale coal gangue milling projects. The vertical roller mill adopts the working principle of roller pressing and grinding, which can complete the processes of crushing, grinding, grading and conveying in one step. Compared with ball mill, vertical roller mill has the advantages of high production efficiency, low energy consumption, small floor area and good environmental protection performance. When milling coal gangue to 80mesh, the vertical roller mill can achieve a production capacity of 10-100 tons per hour, and the unit energy consumption is only 20-30 kWh/ton, which is 50% lower than that of the ball mill. At the same time, the vertical roller mill adopts a closed-loop production process, which can effectively control the dust emission, meeting the national environmental protection standards.
The 80mesh coal gangue powder produced by milling has a wide range of applications. In the production of building materials, it can be used as a raw material for cement, brick making and concrete admixtures. For example, adding 80mesh coal gangue powder to cement can reduce the amount of clinker, reduce the production cost and improve the performance of cement. In the field of power generation, 80mesh coal gangue powder can be used as a fuel for circulating fluidized bed boilers, realizing the utilization of energy. In road construction, 80mesh coal gangue powder can be used as a road base material, which has good stability and durability.
To promote the resource utilization of coal gangue, it is necessary to select appropriate milling equipment according to the scale of production and actual needs. For large-scale coal gangue processing projects, vertical roller mill is the preferred equipment, which can improve production efficiency and reduce energy consumption; for small-scale projects, ball mill can be selected due to its low investment cost. At the same time, it is also necessary to strengthen the research and development of milling technology, improve the performance of milling equipment, and further improve the resource utilization rate of coal gangue.
