CHINA MINE ENGINEERING

Abstract:Digitization and intelligence promote the rapid development of various industries in society, but the development of the mining industry is still in the stage of automation and mechanization. How to accelerate the development of the mining industry and achieve the matching of its technological and economic development with the overall stage of social development has become an urgent need for the industry. This article summarizes the development status of the domestic mining industry and the status of mine construction technology, summarizes the core content of smart mine construction, and analyzes the development contradictions of mine construction enterprises. Based on the analysis of the current actual application status of TBM projects, this article discusses in detail the feasibility of applying TBM to metal mine ramps from the aspects of TBM adaptability, mine ramp characteristics, and TBM application difficulties. In the future, as the technology becomes more mature and the economic advantages become more obvious, TBM technology can shorten the mine infrastructure construction period and solve the contradiction in the development of mining enterprises, it has a broad potential market for application in mine shaft engineering.

Abstract:Based on the typicality analysis of copper smelting slag beneficiation, this paper summarized the general measures to obtain good technical and economic indicators, such as high temperature slow cooling of slag ladle, pre-crushing, semi autogenous grinding process, stage-grinding and stage-separation, cancellation of separate regrinding of middling, combination of reagent, iron recovery by magnetic separation and improvement of filtration performance. this paper puts forward the typical process applicable for slag beneficiation as follows: “Primary ore crushing+Semi-autogenous grinding+Coarse grinding+Speed flotation+Regrinding+Multiple flotation+Tailings magnetic separation”, this process has good technical and economic indexes and can be popularized in similar projects.

Abstract:To ensure the safety of mine production，improve the level of resource utilization and extend the service life of the tailings pond,a full tailing cemented filling system is designed and constructed. Since the system has been put into use for many years，the filling capacity, slurry concentration and filling body strength meet the design requirements，the filling capacity, slurry concentration and filling body strength meet the design requirements, the technological specifications are stable. The successful application of the full tailings cemented filling system in Xitieshan lead-zinc mine has provided key technical support for the safe production of Xitieshan lead-zinc mine, and it has also provided benefits for the green, safe, efficient and economic mining of similar large-scale nonferrous mines in China.

Abstract:Mine survey technology provides technical and construction basis for mine，correctness of production guidance in mining engineering, protect and supervise the rational development of mineral resources, through the whole process of mining, the measured data must be detailed, true and reliable, in order to play a guarantee role in mine production. In recent years, with the rapid development of science and technology, mine measurement technology also has significant technological innovation. This paper mainly discusses the main role of 3D laser scanner and supporting software in mine production engineering through the practical application of handheld 3D laser scanner.

Abstract:With the rapid development of Chinese economy, how to accelerate the development of mineral resources safely and effectively is a problem that every mining company needs to face. Based on the situation of nine goafs in a mine, backfill, caving and hybrid method are studied to treat the goafs in this paper, it provides a safety assurance for mine production in the future.

Abstract:In order to improve the environmental protection standard of a gold concentrator, increase ore processing capacity, the original process of mixed bearing all slime cyanidation carbon slurry process in the concentrator was transformed into Nielsen gravity separation mixed flotation process. Through technical transformation and chemical technology, such as replacing the straight line division and canceling the mixing process, the ore processing capacity is increased from 450t/d to 700t/d，the recovery rate of Nielsen gravity separation reaches 52.74%, the comprehensive recovery rate of gold is 96.60%, and the production index is good.

Abstract:In order to prevent spontaneous combustion in the goaf of 10105 working face, by analyzing the principle of grouting (glue) fire prevention technology, according to the specific conditions of the goaf and the characteristics of the grouting (glue) construction process, determine the grouting (glue) fire prevention plan the position of the final hole of the drilling hole, the spreading radius of the grout, the distance between the holes, the arrangement of the holes, the grouting (glue) material and the grouting (glue) sequence and other parameters, and monitoring operations during the grouting (glue) process. The results show that after the grouting (glue) project is implemented, the CO concentration in the goaf is greatly reduced, and the CO concentration is reduced to a reasonable range.

Abstract:The application of the technology of cutting top and pressure relief to the retaining roadway of 80706 return air roadway, according to the actual surrounding rock conditions of the roadway, by using engineering analogy method and theoretical calculation method, the roof cutting and pressure relief scheme of roadway retaining section, roof retaining and gangue supporting parameters of roadway retaining section and goaf are determined. After field application, the amount of roof and floor approaching and the deformation of roadway side are small, it will not have a significant impact on the subsequent use of the roadway.

Abstract:In this paper, Daqiao Gou coal mining group as the research background, through the analysis of the mine roof lithology, the engineering geological conditions of No.9, No.10 and No.11 coal seams in the middle group are poor to medium, the roof caving is good. The corresponding safety management measures of working face mining are put forward to provide reference for the safety mining of the same type of mine.

Abstract:Gob side entry retaining can improve the recovery ratio, reduce the amount of roadway excavation and reduce the gas disaster. This paper discusses the influence factors of surrounding rock stability in coal mining, The principle and process of roof breaking in gob side entry retaining are discussed, it provides a very important reference for the reasonable use of gob side entry retaining technology in coal mine.

Abstract:This paper describes several problems during the commissioning practice of the ore crushing station and belt conveyor system of the Mirador copper mine in Ecuador, analyzes the causes of the problems, and proposes solutions to the problems. It has certain reference significance to the similar mine commissioning.

Abstract:Based on the increasingly severe situation of air pollution, taking xiejiahegou coal mine as the engineering background, this paper analyzes the feasibility of low concentration gas power generation in Xiejiahegou coal mine, it is concluded that the low concentration gas power generation in xiejiahegou coal mine is feasible.

Abstract:In this paper, the characteristics of supercritical carbon dioxide, the experimental study of supercritical carbon dioxide fracturing rock mass, the study of fracturing coal and the field application of supercritical carbon dioxide fracturing are investigated and summarized in detail, the research progress and deficiency of supercritical carbon dioxide fracturing technology are discussed.

Abstract:In this paper, the original Yuanxiaoming mine polyacrylamide dosing system as the background, through the transformation of dispensing, the control system can realize the local “manual/automatic” switching. In order to increase the fineness of the medicament, the agitator is used to stir the medicament at low speed and uniform speed, and the high-speed water power of tap water is used to disperse the medicament and increase the contact penetration area with water. The reformed automatic dosing system can realize the automatic mixing and conveying of liquid medicine, shorten dissolving time and realize continuous dosing. Prepare 400L 0.5kg polyacrylamide solution at one time, it can provide two-day usage of sewage treatment plant.

Abstract:In order to avoid the safety problems caused by the large area collapse of the overlying rock in the goaf during the mining period of the fully mechanized working face with hard roof, taking 1501 fully mechanized working face as engineering background, based on the analysis of No.5 coal seam roof strata，combined with the practical application, the paper puts forward the technology of weakening hard roof by deep hole blasting. After field application, the first weighting step of the roof is shortened to 19.5m, and there will be no large area hanging in the goaf, which creates good conditions for the production of the working face.

Abstract:The main shaft, auxiliary shaft and ventilation shaft of Ruihai Mine are close to the coastline. According to the special strata in this area, the vertical shafts are constructed by freezing shaft-sinking method, and the freezing project has been completed now. Combined with the engineering practice, this paper summarizes and analyzes the key points of the technical layout of the freezing hole in the geological environment with large flow rate and high salt content near the sea.

Abstract:In order to solve the problem of gas control in outburst mine，taking 1151 fully mechanized working face of a mine in Guizhou as the research object，in view of the high gas content of this coal seam and its adjacent coal seam, the absolute gas emission during mining is relatively large, the phenomenon of affecting the normal advance of working face, this paper puts forward the comprehensive construction technology of gas drainage in coal seam, gas drainage in high-level borehole, gas drainage in goaf, gas drainage by buried pipe in upper corner and end plugging in goaf. The results show that, the technology can effectively eliminate the threat of gas outburst in working face, during the working face mining, 1151 fully mechanized working face did not appear gas outburst and overrun phenomenon, the safety of the working face has been reliably guaranteed.

Abstract:Under the background of continuous promotion of ecological restoration in open-pit mine, an open-pit mine is taken as an example, this paper analyzes the existing geological environment and natural ecological environment problems, evaluation of slope stability based on geotechnical properties and soil nutrients, adopt “slope cutting flat plate+rail pile+slope toe pressing+drainage” and “anchor rod and lattice slope protection+retaining wall”, “grouting fire extinguishing+retaining wall” to implement overall and local treatment, the plan of ecological restoration in different districts should be worked out, it is of practical significance to study the measures of open pit renovation.

Abstract:This paper takes No.8 coal seam of a mine as the research background, the safety of roadway excavation and working face mining is studied, specific safety management measures are put forward, it provides technical support for the safe mining of the mine.

Abstract:This paper takes the development and utilization of low-grade ore in two mines of gene nickel industry as the background，it has adopted many ways, such as organization optimization, technological transformation, seeking policy support, and adopting both the rich and the poor. The practice results show that, combined with the actual situation of mines and deposits, through the effective combination of various ways, the development and utilization level of low-grade ores can be greatly improved.

Abstract:In this paper, taking a coal mine as an example, the pressure relief gas drainage of protective seam mining is studied, the problem between coal and gas protective layer is expected to be solved, promote the effective reduction of gas content per ton of coal in the protected layer, so as to provide a reliable protection layer for mining.

Abstract:The special investigation project of Guangzhou rail transit line 12 carries out the investigation of coal mine goaf along the project by means of geophysical exploration and micromotion, and basically finds out the distribution characteristics of coal seams along the project, basically explores the distribution, spatial form, filling situation and overburden type of goaf along the project, basically finds out the buried depth, specific height and development status of caving zone, fracture zone and bending zone caused by goaf, preliminarily evaluates the stability of goaf and its suitability for urban construction, and puts forward feasible Suggestions for construction. Based on this, this paper analyzes the urban geological hazards in the mine goaf of Jiahe Mining area in Guangzhou, which enriches the theory of urban geological hazards and provides guidance or reference for disaster management in the urban goaf.