CHINA MINE ENGINEERING

Abstract:A lead-zinc oxide ore in Yunnan Province is directly treated by the existing smelting process with high cost, this ore can be pre-concentrated by mineral processing, which provides favorable conditions for economic development and utilization of the ore. In this paper, pre-concentration of the ore is carried out through a method of mineral processing, the experimental results show that the effective pre-concentration of the ore can be achieved by the principle process of “sulfur before oxygen, lead before zinc”, the lead grade of the ore is increased from 5.28% to 10.63%, and the zinc grade of the ore is increased from 11.40% to 22.94% on the premise that the loss rates of lead and zinc are 10.88% and 8.61% respectively.

Abstract:Based on the problems of poor ventilation conditions in Sareke copper mine, single wing ventilation and double wing ventilation are adopted, check the total air volume from four aspects, the control of ventilation system is studied. The results show that no short circuit, air leakage, turbulence, stagnation, cross flow and reverse flow are found, the design of the ventilation system is simple, which ensures that the mine underground operators have a good working environment, can breathe fresh air, reduce the toxic and harmful gases and dust hazards produced by truck exhaust and gun smoke, and ensure the safe and efficient production of the mine.

Abstract:The orebody occurrence in the zinc plant area of the South tin mine is close to the surface, it is designated as safety pillar, mining belonging to difficult mining bodies. In this paper, through the selection of advanced mining methods and technology, the establishment of shallow filling system to deal with a large number of goafs and other effective measures, the mining safety of the safety pillars near the surface has been improved, it has been popularized and applied in mine production practice.

Abstract:With reference to the preliminary design of Donggou molybdenum mine in Ruyang, the occupational hazard factors of Donggou molybdenum mine in Ruyang are predicted through analogy analysis, so as to provide basis for the design of occupational hazard protection facilities in Donggou molybdenum mine in Ruyang.

Abstract:In this paper, the metallogenic geological characteristics of huoluotai copper deposit in Mohe county are comprehensively studied from three aspects: stratigraphic characteristics, regional geological characteristics and ore characteristics. According to the metallogenic geological characteristics, the prospecting prospect of huoluotai area is analyzed from the aspects of metallogenic geological conditions and copper distribution. Through the above research and analysis process, it provides the research direction and theoretical basis for the future mineral research in this area.

Abstract:When water inrush occurs in the process of downward excavation of ramp, it is necessary to ensure the safety of personnel, stabilize the water level at a suitable position, reduce precipitation depth; then the geological conditions are fully studied, analysis of water filling factors, taking reasonable grouting water control scheme, minimize the cost of water control, reduce the impact on the construction period.

Abstract:This paper takes the construction of large diameter deep shaft in an iron mine as the engineering background, through careful analysis of construction organization design, carry out research on Optimization of process, many factors such as construction period、safety、economy and on-site construction are comprehensively considered，through scientific planning and reasonable adjustment of process, the waiting time of night construction is reduced, the continuity of construction is ensured, and the efficiency of shaft construction is improved.

Abstract:Taking an iron ore district as the engineering background, introduces the well point layout principle and construction method of tube well dewatering, introduces the problems and treatment methods in the dewatering construction of silty clay layer through the analysis of engineering examples, and sums up some experiences and precautions of tube well dewatering.

Abstract:By combining the modified Mathews stability graph and FLAC^3D numeral simulation software, the authors make an optimization study on stope layout and structure parameters in a gold mine, five kinds of feasible optimization scheme are designed according to mining method and morphology of ore body, through this study, rational stope layout and sizes of room stope and pillar stope are determined from five schemes, which ensure the safety under the condition of high extraction efficiency, this study is a good reference to similarly design and productive work.

Abstract:In order to solve the problem of large area roof hanging in goaf when mining hard roof coal seam, the deep hole blasting method is proposed to weaken the roof, so the hard roof can collapse in time after mining. The research shows that if no weakening measures are taken in 12108 fully mechanized face, it is estimated that the first pressure step is 59.5m, a large area of roof hanging in the goaf will bring a significant threat to the safety of working face. After field application, the first pressure step of working face is 26.2m, the dynamic load coefficient is 1.35, the pressure step is short, and the weighting strength is significantly reduced, which creates a good condition for the initial mining of working face

Abstract:In order to realize the safe mining, 501101 fully mechanized top coal caving face passing through DF27 fault is taken as the engineering background, it is proposed to reinforce the surrounding rock of fault fracture zone by advanced grouting in the mining roadway and auxiliary grouting in the working face, and the grouting reinforcement scheme is designed. After field application, the advancing speed of working face is kept at 6m/d，the roof and coal wall keep stable when the working face passes through the fault. The grouting reinforcement scheme not only does not affect the working face, but also creates good conditions for the working face.

Abstract:In this paper, when 1606 fully mechanized coal mining face passes through X3 collapse pillar, the coal and roof strata are broken, the roof management measures of grouting reinforcement and arrangement of bumping wedge are put forward, the layout technical scheme is described in detail. In field application, the mining speed of working face is increased from 3.2m/d to 4.5m/d, avoid roof pressure. After grouting and wedge support, the coal wall and roof of the working face remain stable, the working face took 10 days to pass through the collapse column, and achieved remarkable application results.

Abstract:This paper mainly studies the outburst prevention technology of close outburst coal seam, expounds the typical characteristics of coal seam and gas occurrence in the case of close coal seam outburst, so the outburst prevention area of coal seam is divided reasonably. At the same time, according to the current situation of the actual case, the specific outburst prevention technical measures of short distance outburst coal seam are put forward.

Abstract:Aiming at the problems of low degree of automation, relatively poor working environment and high labor intensity in the rail transportation system of 330m main adit in Zijinshan gold copper mine, this paper studies the development and application of the key technology of unmanned driving of the traditional underground electric locomotive, based on 5G, WiFi and optical fiber communication technologies, 5G high-speed wireless communication and industrial ring network are formed, the unmanned driving system of electric locomotive can realize the switching of three modes: automatic control, remote control and manual driving, it can adapt to continuous operation of production system under different conditions, it greatly improves the efficiency of electric locomotive transportation, effectively improves the level of underground transportation intrinsic safety, and has good application value.

Abstract:In this paper, through extensive research, field tests and other means，the problem of coring and plugging in complex formation is deeply studied，the influencing factors and main causes of coring plugging were analyzed, the preventive measures are put forward and the coring management is optimized, which effectively improves the coring efficiency of complex formation.

Abstract:In order to improve the reliability of power supply system of local fan in underground driving face, taking the power supply of local fan in 2201 and 2203 driving roadway of a mine in Shanxi Province as the research object, through improving the power supply of underground local fan, the power supply reliability of local fan is effectively improved, after the completion of the transformation, there was no unplanned shutdown accident of the local fan, which significantly improved the air supply quality of the heading face. The research results can provide reference for other mine local fan power supply transformation.

Abstract:In order to improve the reliability of power supply system of local fan in underground driving face, how to use the statistical method correctly and apply it to the quality control work is a practical problem that the managers in charge of the quality control work need to solve. This paper describes the application and calculation process of statistical methods commonly used in the internal quality control of coal laboratory, in order to improve the effect of internal quality control of coal laboratory.

Abstract:This paper selects the practice analysis of rapid excavation technology of composite roof roadway as the research topic, combined with daily work experience, this paper briefly describes the general situation of driving roadway; analyzes the process optimization of rapid excavation technology of composite roof roadway, and on this basis, discusses its guarantee mechanism.

Abstract:Based on an example of the upstream water retaining dam heightening project for the tailings pond heightening, aiming at the requirements that there is a road on the dam crest to reserve and there is a large number of waste rock near the site to use, against the problem that the dam foundation has deposited thick fine tailings soil, the heightening scheme of using inclined wall earth dam and the dam foundation treatment method of riprap compaction combined with dynamic compaction replacement are recommended, the safety of the heightening scheme and the dam foundation treatment method is verified through the seepage and stability of dam, porosity measurement of dam fill and measured settlement data of the dam.

Abstract:This paper is based on the hydrogeological conditions of Daqiaogou coal industry, several aspects of water filling factors in mine are analyzed, the water inflow of the mine is predicted, When the production capacity of No.8 coal seam reaches 900000t/a, the normal water inflow is 9.21m³/h, and the maximum water inflow is 14.84m³/h, when the production capacity of No.9, No.10 and No.11 coal seams reaches 900000t/a, the normal water inflow is 9.21m³/h, and the maximum water inflow is 14.84m3/h.

Abstract:An open-pit limestone mine is located in the affected area of karst cave and karst, the blasting process in stope has a great influence on the slope stability of this section. Do blasting line in upper +145m, the blasting vibration to the vibration of the user data collected waveform wave velocity diagram and use Steve sadove formula fitting regression equation, according to the law of blasting vibration propagation in line from the results in the region to ensure the slope is not affected by vibration, seismic fortification intensity is not more than 7 °, and now the demolition of the regions largest control to control within 360kg, total quantity control in less than 7000kg, guidance in controlled blasting problems need attention in the future and the safety measures.

Abstract:This paper takes a mine in Guizhou as an example, the combined gas drainage technology of coal seam group mining in outburst mine is analyzed, the combined gas drainage technology is formed according to the actual geological conditions of the mine. After field application, the comprehensive extraction rate of coal seam gas can reach more than 50%, and the gas in the air return roadway and upper corner of the working face is within the safe range.