With the increasing production scale of open-pit coal mine, the application of semi-continuous process in open-pit mine is more and more extensive. Practice has proved that the application of stamler feeder breaker will greatly improve the economic benefit of coal mine, and in the semi-continuous process, the position of stamler feeder breaker will play a decisive role in the production benefit of coal mine. With the help of the definition of limiting slope and the requirement of the production capacity of the crushing station in the pit, the coal seam in the pit is partitioned. On this basis, the calculation methods of the distance between the coal truck and the pit crushing station and the surface crushing station, the increasing distance of the inner discharge and the length of the lifting belt in the pit are given. After considering the semi-continuous system as a whole, based on the principle of minimum total transportation cost, the layout level optimization model of crushing station is established, and the calculation methods of truck freight, increased interior freight and the total cost of lifting belt system are given, and the optimization model is applied to the case study. The calculation results show that the total transportation cost is minimum when the crushing station is arranged at +625m level in open-pit coal mine, which is the optimal level of crushing station layout. In addition, the analysis shows that the position of the stamler feeder breaker in the pit should not be too low to avoid greater impact on the internal platoon.
The semi-continuous process synthesizing the advantages of continuous process and intermittent process is an efficient open-pit mining process. It has become one of the most vitality and potential mining processes in the current open-pit mining process. With the increase of production scale and mining depth of large-scale near-horizontal open-pit mine, the crushing station arranged on the surface at the initial stage of mining
The effect was significantly reduced. In order to give full play to the advantages of semi-continuous process to reduce vehicle distance, reduce freight and improve the economic benefits of open pit, the position of stamler feeder breaker should be moved to a certain level in the pit. Whether the semi-continuous process can achieve greater economic benefits depends on many key technologies of the process. The reasonable determination of the reasonable layout level of the semi-fixed crushing station is not only one of the most important influencing factors, but also an effective guarantee to reduce the production cost. However, due to the geological conditions, mining technology, mining parameters, ground system and other restrictions in the open-pit mine, all the crushing stations that meet the production requirements cannot be lowered into the pit. In this way, the pit crushing station and the surface crushing station can only be combined to meet the production requirements. According to the characteristics of semi-continuous mining process, the coal seam in the pit is partitioned to plan the service coal volume area of the pit crushing station and the surface crushing station. On this basis, the layout level optimization model of stamler feeder breaker is established to optimize the position of the pit crushing station.
When all stamler feeder breakers that meet the production capacity cannot be placed in the pit for service, but in order to better play the role of crushing stations, they are still needed, only those crushing stations that meet a certain output can be placed in the pit for service. In this case, this study puts forward the idea of partition of coal seams in the pit. In addition, it is also to make full use of the pit crushing station to reduce the transportation distance of coal and reduce the return transportation. The zoning principle is: the difference H between the elevation of the coal seam center of gravity and the surface elevation of the crushing station, and the linear distance L from the elevation of the coal seam center of gravity to the surface crushing station. When HM/Lm
Through the above method, the coal seam can be divided into A and B2 zones (as shown in Figure 1). The coal reserves of each layer of mining step can be expressed as M', and M'2. But because the capacity of the lower stamler feeder breaker is partial production capacity, This will result in the problem that the amount of coal retained in the pit crushing part A cannot meet or exceed the capacity of the pit crushing station. Therefore, for the partition of coal seam in the pit, the capacity of crushing station in the pit should be considered. The coal amount in part A is the coal amount M' obtained under the condition Hl/Loi>R, and the capacity Q of crushing station in the pit. , that is, the coal amount of part A is M, =min(Mx, Q,), and the coal amount of the rest part is M; , the annual output of coal mine M=M+M, under such conditions, the coal amount in part A and Part B of each mining step is MN and Mu respectively. Make the lower part of the open-sky stamler feeder breaker pit layout optimization.
