Non-Explosive Continuous Mining Theory And Technology Research In Deep Phosphate Mine

Abstract:Safe and efficient exploitation of mineral resources is what the mining enterprises are pursuing for. With the evolution of mechanical equipment, information technology, the efficiency of the exploitation of mineral resources has also been improved, especially for those underground mines, the efficiency of mining was directly determined by machinery and equipment level. Therefore, mining efficiency improving by using advanced machinery and equipment, information technology to realize continuous mining has always been the focus of the research. As the resources mining in deep environment, if the sophisticated excavation machinery and equipment was used to exert small mechanical disturbance for rock mass breaking by utilizing high stress state in deep, and then jointed by advanced loading, transport equipment to achieve full mechanization non-explosive continuous mining. So that not only can achieve high efficiency continuous mining, but also reduce the rate of industrial accidents, and ensure safe production. In view of this, the main contents of this paper are as follows:High stress and hard rock fracturing mechanism was studied, and the dynamic problems of hard rock in high stress state as well as practical engineering applications in mechanical rock breaking principle were also analyzed. Excavation failure modes and laws of the surrounding rock in the unloading condition in deep were theoretically and numerically simulated to provide theoretical support for non-explosive continuous mining as the induced roadway existed.Development Scheme of roadheader mining for Kailin Maluping was discussed considering orebody characteristics and the relevant parameters of the roadheader. Roadheader mining characteristics were analyzed, and the cross-section of mining entrance, reasonable excavation direction, roadheader mining method were determined.Broken area of orebody surrounding the excavated laneway under the condition of unloading process was monitored and evaluated, which will provide the basic data for following roadheader mining and theoretical broken research of unloaded surrounding rock.On-site industrial laneway excavation tests and incision tests of orebody surrounding the excavated laneway were carried out. The excavation efficiency and cutter wearing status of these two kinds of tests were compared to find out the assistant effects of excavated laneway to roadheader mining. At the same time, dust concentration on roadheader working face was measured, dust distribution law was deduced, and the dust prevention and ventilation methods were proposed.