Optimization and application research on semi-continuous technology system with mobile crusher in large open pit coal mines

Abstract：Based on the need of mobile crusher semi-continuous mining system application in large open pit mines,this dissertation comprehensively applied surface mining theories,mining engineering system theories,technology economics theories,as well as computer technology.Through investigation researches,theoretical analysis and spot engineering practice,the dissertation researched on crushing equipment selection,structure optimization,determination of crusher locations and shifting distance,as well as the application of stripping semi-continuous technology system. Based on the results of previous studies,the dissertation summarized the classification of crusher and the concepts of all kinds crushers in this dissertation.With the aim of open pit profit maximization,this study established a two-grade crusher comprehensive optimization model.In addition,according to the needs of stripping semi-continuous technology system used in open pit coal mine,the crushing characteristics and suitable crusher type of the high moisture content and easily bond material were analyzed.This dissertation present a view of modular crusher station as well as to improve the flexibility,reliability,and local production ratio of the crusher station,and to improve the working environment.Based on these,the dissertation established the parameter optimization model of feed hopper structure.This dissertation showed the previous research results on truck-shovel match of shovel truck discontinuance technology system,and analyzed the characteristic of truck transport under mobile crusher station semi-continuous mining system.Targeting the lowest system production cost the dissertation established the optimization model of truck type.According to the characteristics of mobile crusher locate in pit,this dissertation analyzed the affect factors and established the optimization model of crusher station location optimization model and shifting distance optimization model.The dissertation also introduced the transport distance increase coefficient k into the optimization model to embody the influence of belt conveyor transport system of the lower level to the internal dumping distance of upper levels. According to the need of stripping semi-continuous technology system application and the characteristics of mobile crusher,the dissertation established service areas model of open pits semi-continuous mining system,group bench mining model and strip width optimization model in this dissertation.These models provided the basis for service areas and mining parameters determination of stripping semi-continuous technology system.In order to meet the needs of stripping semi-continuous technology system application with mountain slope dumping area,system characteristics,link structure,application conditions and economic efficiency of discontinuous-continuous-discontinuous form semi-continuous technology system were analyzed in this dissertation.In order to improve the belt conveyer efficiency,the dissertation presented combined system that crusher and bucket wheel excavator use the same transport system,and four kinds crusher station location have been compared. The author verified the practicality of models established in this dissertation through case studies.