On account of problems encountered in actual productiont of the BWE continuous system in Zhahanao’er open-pit mine,Set?in the system shift,to analyze whether or not to proceed with continuous system,compared with discontinuous stripping technology about production cost and new investment;research on plane space arrangement，combine geological occurrence and adverse conditions encountered in actual production，analyse the best time to implement downgrade level layout.The results showed that:compared with the discontinuous technology,unit cost of the BWE continuous system is the lowest,the maximum payback period of the new investment will be 2.98 years,it is economical and reasonable to continue to use tBWE continuous system;combine selection of the final layout scheme,prove that the system efficiency can be improved by changing the space arrangement of the BWE continuous system,and the new layout scheme is advantageous to the production in the open-pit mine .

Deep high stress in order to determine the reasonable layout of working face double lane lane between the coal pillar width, and increase the stability of coal pillar and resource recovery, this paper takes the garden ditch coal mine 1022101 working face as the engineering background, the field investigation and theoretical analysis, numerical simulation methods, grasp the roadway section stress distribution of coal pillar, determine the deep high stress section lateral abutment pressure distribution of coal pillar, and USES the FLAC3D numerical simulation of the multiple mining face under the influence of different width (7 m, 10 m, 13 m, 16 m, 19 m, 22 m, 25 m) stress field distribution of coal pillar, Combined with the analysis of surrounding rock failure of 15m and 25m coal pillars in the field test roadway, the reasonable width of coal pillars between roadway under the condition of high stress in the deep is finally determined. The study shows that when the width of coal pillar is 16~25m, the stress concentration under multiple mining influences the coal pillar, which is easy to cause rock burst. When the width was 7~10m, the coal pillar was completely crushed and the roadway was seriously deformed and destroyed. Considering resource recovery, roadway surrounding rock stability and dynamic disaster prevention, it is reasonable to determine that the width of coal pillars between high-stress roadway in deep part of Yuanzigou coal mine is 13m~15m.

The key technology of 3D design for vertical shaft equipment difficulties, study the relationship between the wellbore section of component, design parameters of a rapid modeling technology driven using one parameter and three drivers and automatic assembly technology, implements the wellbore parametric 3D modeling and 2D and 3D construction drawing three driven design and design documents, thus realized the standardization of the vertical shaft equipment design, streamline, automation and intellectualization. The system can not only greatly improve design efficiency and quality, indirectly reduce design errors and design changes, but also improve the working mode of the design unit, which is a very meaningful attempt.

Aiming at the problems of multiple lengthy links, low transportation efficiency, low reliability and low safety of Bayan Gaole Coal Mine Auxiliary Transportation System, through the research and analysis of the downhole transportation conditions in the coal seam at 311202 working face of Bayan Gaole Coal Mine, a comparative analysis was made. The working efficiency under different reloading modes has been proved by practice; with the method of "container reloading mode", the auxiliary transportation efficiency of the mine has been greatly improved. Relying on the upgraded and improved transportation equipment will increase the output of coal mines, reduce production costs, and increase auxiliary transportation. Level is important.

The open-pit mine coal underlying the slopes backfill mining can effectively improve the recovery of coal, reduce the loss of mineral resources and reduce environmental pollution. The filling equipment in the backfill mining process is the most important equipment for the entire filling system. According to the needs of the backfill mining operation of Delong open pit coal mine, the self-moving filling and retaining equipment was independently developed. The equipment can be operated for different coal seam inclination angles during the filling process, mainly consisting of the walking support device and the baffle device, which can be unmanned operation during the backfill mining process.

BIM (Building Information Modeling) is accelerating the construction sector to other engineering fields.. Its integrated engineering design, construction and management philosophy to make the technology more and more attention and recognition. Currently, intelligent open pit engineering BIM technology is still in trial stage exploration. Compared with the traditional engineering, the intelligent open-pit mine project has the characteristics of obvious professional intersection, high level of information integration, and huge data volume, so it is urgent to establish a set of information classification and coding standards suitable for it. In order to apply BIM technology to open-pit mine engineering, this paper studies the engineering information classification and coding standard of intelligent open-pit mine comprehensively considering the engineering characteristics. Based on this standard, combined with the different needs of the whole life cycle, the whole engineering field and all participants of intelligent open-pit mine project, the author compiled a total of 22 classification tables, including "building by function, building elements by form, work achievements and behavior". This table provides necessary preconditions to clarify the process of information transmission in order to realize intelligent open-pit project based on BIM, consolidate the BIM model digital unified standard delivery of open pit project foundation, follow up research and development of the construction of the intelligent open pit mine.

In view of the unreasonable addition of chemicals in the slime water concentration process, the waste of chemicals increases the cost of the coal preparation plant, and even leads to unsatisfactory overall concentration effects and inability to meet the feed requirements of the press filter after concentration. Designed an intelligent dosing control system under different working conditions of slime water thickening, real-time identification of slime water thickening feed conditions, based on overflow turbidity (thickening effect) and underflow concentration of thickener (filter press feed requirements) and The chemical consumption is the optimization goal, and the chemical dosing system based on the MOPSO slime water concentration process is designed. Through simulation verification and industrial field application test, good results are obtained.

Based on the theory of roof cutting and pressure relief along goaf and the practice of Xiangshan mine, taking No.3 coal mine 21311 auxiliary air intake roadway as the research object, a complete set of goaf retaining technology, which integrates roadway support, underground equipment rapid transportation and goaf plugging, is formed around the main influencing factors of roof cutting and pressure relief along goaf. The displacement of the roadway surface and the supporting force of the new single pillar are measured, the law of the surrounding rock and the pressure change of the roadway along the goaf under the technology of roof cutting and pressure relief is studied, and the effect of the new gangue retaining pillar is analyzed. The results show that the supporting pressure of the single pillar is directly proportional to the distance of the working face, the closer it is to the working face, the greater the roadway pressure, and vice versa.

In order to solve the problem of the difficulty of the support of the coal seam roadway at a mine of Fengfeng Group when the coal seam is mined at close range, the stress peak and its influence range below the upper coal seam after mining are analyzed, and the "anchor bar (rope) preload load is designed for the most difficult position of the lower coal seam roadway support." The support scheme of the time-between scattered pressure of the pressurer, and the change of the top plate off-level number and the range of the pull zone by numerical simulation calculation and continuous monitoring of the manual measuring station, as well as the deformation of the surrounding rock and the force size of the anchor bar (rope) are observed and analyzed, the results show that the use of After the anchorbar (rope) preload load and pressure press split pressure"support scheme, the roadway support effect can meet the needs of safe production and can provide reference for similar lane support.

There is a high possibility of water seepage accident in roadway excavation in Gubei coal mine. In order to tunnel efficiently and safely, it is necessary to explore the floor limestone in a certain range of the two sides of the roadway in advance. Taking boreholes (TD2-1 and TD2-2) as examples, the construction technology of advanced exploration directional drilling is analyzed and optimized in this paper. Then, the author takes the conventional advanced exploration hole in the same area as the comparative object, and makes a comparative study of the two construction schemes from economic benefit and effect of exploration. The results show that, compared with the conventional advanced exploration borehole, directional advanced exploration hole has higher economic benefit and exploration effect. This is expressed in the latter requires less drilling and auxiliary excavation work, but has higher drilling rate in the target horizon.

In order to improve the control effect of the upper corner and the return air gas of the coal face, large diameter directional borehole is constructed in the coal seam overlying roof slate layer. According to the geological characteristics and mining conditions of roof overburden in working face of Sihe coal mine, and based on the empirical formula, the high-level directional long borehole arrangement layer of roof is determined. Aiming at the problems of low efficiency about pilot directional drilling and graded reaming in the construction of large diameter directional borehole in roof hard rock, the impact screw motor, torsional impactor and two-stage and two-speed reaming drilling tools are respectively applied to pilot borehole construction and reaming construction which can improve the entirety construction efficiency of roof high large diameter directional drilling. The application results in Sihe coal mine show that the drilling efficiency of impact screw motor and graded reaming technology was improved significantly. The maximum drilling rates were respectively 13.6m/h and 11.1m/h. The large diameter and high-level directional long drill hole of Ф 200mm can ensure the effective extension in the seam roof fracture zone and realize the continuous and stable extraction of mining pressure relief gas, which has been obtained good gas extraction and control results, the average gas drainage flow of a single hole can reach more than 3.36m3/min and the instantaneous maximum gas extraction capacity of a single hole can reach 26.0m3/min.

Abstract:Freezing method is often used in the construction of deep alluvial mine, but the accumulation and release of frost-heave pressure in freezing process often endangers the safety of outer shaft liner and freezing pipes, and even causes engineering accidents. Based on the physical model experiment, this paper studies the distribution of the temperature field on the inside of the shaft lining and the inside of the ice wall, as well as the characteristics and distribution characteristics of the frozen expansion stress inside the ice wall. The results show that the frost-heave pressure of the soil body after freezing the wall cross-circle has a significant extrusion effect on the soil body near the shaft liner, the frost-heave pressure near the main freezing pipes circle is large, and the frost-heave pressure on the inside of the ice wall is greatly affected by the ice wall of the main freezing pipes circle.

Based on the background of muduchaideng mine in Inner Mongolia and Shaanxi base, the monitoring data of ground pressure in the process of stopping and resuming mining of long and large working face are analyzed, and the law of ground pressure behavior before and after stopping and resuming mining is studied. Finally, the key technologies of rock burst prevention and control in the process of stopping and resuming mining are summarized. It shows that: before and after stoppage, the energy and frequency of microseismic time significantly reduces, and the data of coal seam stress and support resistance significantly increases; the activity intensity of vibration field goes through sudden increase to decrease and finally to small increase; the first 40 knives (about 35m) in the initial stage of remining are the key areas for rock burst prevention and control; In on-site dangerours area, the workflow of "early warning, drilling and inspection confirmation of dangerous situation, pressure and danger relief, effect verification" works well ; the key measures for rock burst prevention and control in the process of stopping and resuming mining are conclueded, which provides guidance for the prevention and treatment of rock burst in mining face with similar conditions in n Inner Mongolia and Shaanxi base.

In this paper, a method of controlling mine earthquake by weakening the key layer of low position is given.Dongtan coal mine 63upper03 working face is taken as the engineering background. By using the methods of field investigation, theoretical analysis and field test, the principle of mine earthquake prevention and control technology is analyzed, the position of key layer is determined, and the hydraulic fracturing weakening test is carried out for key layer. Geological analysis and theoretical calculation show that the main key layer is fine sandstone 226.72 m away from the roof, and the sub key layer is fine sandstone and medium sandstone 163.92 m and 15.13 m away from the roof. In the sub key layer, the sandstone layer is weakened by directional long hole staged hydraulic fracturing. After fracturing treatment, the daily average number of mine seismic events with energy greater than 5 × 103J decreased by 95.45%. This technology makes the high energy gathered in the key layer disperse and release.

Aiming at the problems of the coal seam of Zhaogu No.2 Coal Mine, such as the hard coal seam, low permeability, poor drilling gas drainage effect and large amount of drilling engineering, it is proposed to use ultra-high pressure hydraulic slotting technology to improve gas drainage efficiency. Based on the principle of stress wave, the mechanism of high-pressure water jet coal breaking is analyzed, and conical convergent nozzles which can effectively improve the jet impact force for hard seam conditions and fixed-point impact slitting methods for hard seam conditions are developed. Field tests show that, for hard coal seam conditions, the average single-edged coal output of the slotted hole is about 0.18t, and the equivalent slotted radius is 0.99 to 1.57m. The natural gas emission amount after slotted is 11.3 times that of ordinary drilling. The scalar quantity is 3.8 times higher than that of ordinary drilling, and the effective radius of drilling extraction is increased by about 90% compared to ordinary drilling. Ultra-high pressure hydraulic slotting technology can effectively solve the gas drainage problem of low-permeability hard coal seams.

Through the analysis of composite index method is used to predict coal mine mining working face of the status quo of outburst danger region tunnelling face verification borehole collapse buried the influence factors of measuring instruments, is proposed and developed a kind of to cushion block coal device, high pressure air processing unit. Type the device based on mine CWY30 borehole gas emission velocity meter structural design, can effectively handle buried instruments, reduce the wastage of the measuring instruments in the area to verify, reduces the mine gas control investment cost, eliminate the potential safety hazard, in order to protect the safety of site construction personnel.

Abstract: In the deep mining process of the mine, the slope forms a high-risk surface with broken structure and steep slope, which is very easy to cause geological disasters of collapse and slide. It is of great significance to study fast and effective monitoring technology for effective prevention and control of slope engineering disasters and mining volume monitoring. In this study, the fixed-wing UAV aerial survey method was used to acquire three-dimensional point cloud data of large open pit mines, and DEM data was generated by point cloud denoising and vegetation removal. According to DEM data, the slope data of mine slope is extracted and the risk analysis of slope is carried out. By using the multi-period DEM difference to obtain the open-pit mine changes and achieve effective monitoring of mining activities. The results show that the aerial survey technology of UAV can quickly and effectively obtain the 3D real scene model of large open pit, and can provide visual data support for government and enterprises. The slope data extracted by terrain analysis from the large-scale open pit mining DEM data can effectively find the slope collapse phenomenon.Multi-period DEM difference data from large-scale open pit mining can achieve accurate monitoring of the amount of mining changes.

Aiming at the problem that the representativeness of primary coal sampling cannot be quantitatively analyzed, discrete element simulation is introduced to analyze the primary sampling process in the middle of the belt and develop particle backtracking technology. At the same time, referring to the principle of judging representativeness of sampling in GB/T 19494-2004 "Mechanized Coal Sampling", using statistical parameters such as dispersion coefficient and position standard deviation after particle backtracking to analyze the backtracking particles, the quantitative research method of the primary sampling’s representativeness in the middle of the coal belt is established. Taking the primary sampler on a 2m wide coal conveying belt with a belt speed of 5m/s as an example, the sampling representative of the sampler at different speeds is quantitatively analyzed. The conclusion shows that the cutting speed of the cutting bucket ranges from 6.03m/s to 6.03m/s. When changing between 9.05m/s, the dispersion coefficient remains between 0.5321 and 0.5249, that is, the cutting speed has no significant influence on the representativeness of its sampling. The position standard deviation along the coal flow direction decreases faster with the increase of the cutting speed. The drop from 0.3326m to 0.2157m means that as the cutting speed increases, the distribution of collected particles becomes more concentrated.

Considering the influence of creep and intermediate principal stress, based on the viewpoint and the unified strength theory that the peak stress of surrounding rock should be the long-term strength of rock under a certain confining pressure after roadway deformation stabilization, and considering the strain softening and capacity expansion characteristics of the post-peak stage of surrounding rock, the elastic-plastic analytical solution of surrounding rock deformation partition is obtained.Finally, the influence of creep and intermediate principal stress on the distribution range of stress, displacement and plastic zone in surrounding rock is analyzed by an example.The results show that when the influence of creep is ignored, the theoretical analysis results of the bearing capacity of the surrounding rock are seriously larger, and the theoretical analysis results of the displacement of the surrounding rock and the distribution range of the plastic zone are seriously smaller due to the non-creep deformation.The intermediate principal stress can obviously inhibit the deformation of surrounding rock and the expansion of the plastic zone. The strength criterion without intermediate principal stress is helpful to eliminate the negative effects of ignoring creep characteristics.

Abstract：In order to study the development law of overburden mining-induced fractures in shallow seam with thin bedrock under the condition of gully topography, this paper uses Shenfu mining area as the research base to analyze the development characteristics of overburden mining-induced fractures on 5-2 coal mining face of Anshan coal mine, and establishes the main roof stress model under the action of weak overburden, that is, the structure model of beam with non-uniform load. Based on the mechanical analysis of the beam structure with non-uniform load, the discriminant conditions of the stability of the bearing structure of the bedrock are derived, the calculation formulas of the parameters such as the pressure, shear force and the ultimate span of the main roof at both ends are determined, the influence law of the thickness and slope change of the weak strength overburden on the mining crack spacing is revealed. The practice shows that the distance between the mining-induced fractures determined by the non-uniformly distributed load beam model and the periodic weighting step are approximately the same; the mining-induced fractures in the overburden develop and evolve periodically with the failure and instability of the bedrock, collapse-type and step-type mining-induced fractures are more developed near the surface above the working face, and the surface fractures above the goaf gradually evolve into closed-type surface fractures with smaller displacements and openings.

In view of the problem of shallow buried depth face mine pressure rule is complex and with numerous influencing factors, through the theoretical analysis and field monitoring and numerical simulation method to study on the shallow buried depth face mine pressure characteristics of the working face length effect. Conclusion is obtained that: Working face length increase has remarkable effected on the mine pressure characteristics, working face length direction exist with the working face length evolution "composite pressure arch" structural over length fully-mechanized sublevel caving mining working face to pressure step distance decrease, mine pressure distribution in working face is central to axis of symmetry of the arch distribution. With the working face length increases, the working face front abutment pressure influence scope, peak position and size are different. When the working face length is 130 m, the abutment pressure peak is located in front of the working face 13 m, its peak value is 6.7 MPa (propulsion 50 m).When the working face length increased to 230 m, the abutment pressure peak position is located in front of the coal wall 8 m, its peak size is 8.5 MPa (propulsion 50 m), bearing stress peak size corresponding increases, but the peak position transfer coal wall direction close to working face, but with the working face length continue to increase, the abutment pressure peak position will no longer change.

In order to solve the problem of large error in predicting the maximum water inflow of roof by using the area analogy method of working face, based on the theory of fluid mechanics, this paper establishes an ideal water inrush model of pipe for calculating the water inflow of roof of working face. Based on the theory of practical ground pressure control, this paper deduces the non-linear formula for the prediction of roof water inflow when the first fracture of transfer rock beam occurs, and reveals the positive correlation between the roof water inflow and the working face inclination width and the first fracture step of the transfer rock beam. Case application proofs that the result of the maximum water inflow in the mining face predicted by water inflow when the first fracture of transfer rock beam occur both mined working face and mining working face, and maximum water inflow of mined working face is more accurate than that predicted by area analogy.

The hydrochemical characteristics of groundwater are helpful to judge the hydraulic connection between adjacent aquifers. In this paper, Wudong Coal Mine is taken as the research object, and the hydraulic connections among bedrock groundwater, Quaternary groundwater and surface water are qualitatively analyzed by using general hydrochemical characteristics analysis, Piper three-line diagram and Gibbs diagram. Using the difference of Cl- concentration in different water bodies, the hydraulic connection degree between adjacent aquifers is calculated, and the hydraulic connection is quantitatively determined. The results showed that the pH of all groundwater samples ranged from 7.1 to 8, which were weakly alkaline water. As the depth of aquifer increases, the TDS of groundwater gradually increases, and the TDS of surface water and quaternary groundwater are lower than that of bedrock aquifer. The main hydrochemical types of bedrock groundwater, quaternary groundwater and surface water are Cl·SO4-Na, HCO3·SO4-Na·Ca, and SO4·Cl·HCO3-Na and SO4·Cl·HCO3-Na·Ca, respectively. Bedrock groundwater samples are affected by concentration, surface water and quaternary groundwater are affected by weathering and evaporation of rocks. At the same time, cation exchange occurred in groundwater and surface water in the study area. The connection degree between Quaternary groundwater and surface water is 0.361, which is medium. The connection degree between Quaternary and bedrock groundwater is 0.404, which is low. The results can provide a reference basis for the prediction of mine water inflow and the prevention and control of water inflow in the later period.

For the presence of seam deep-hole pre-splitting blasting multifactorial complex cases, in order to quantify the effect of blasting analysis, on the basis of deep-hole pre-splitting blasting in coal seam of No.2 coal mine of Zhaogu, the approach of using AHP-Fuzzy mathematics method is presented to establish comprehensive evaluation mathematical model on the effects of Deep-hole pre-splitting Blasting. The blasting safety, technical equipment, economic benefits and influence factors are taken as the first level indicators and 13 factors such as blasting vibration, blast hole punching, pure gas drainage volume and coal hardness and so on as the second level indicators. Through effects verification evaluation of deep-hole pre-splitting blasting in coal seam, rating a score of 85.67, the result is good. Also discussed the impact of ground stress and coal hardness and other factors on blasting effect, the evaluation findings are consistent with the actual effect.

Abstract: The paper analyzes the geothermal data and tests the sampling rock thermal physical parameters in the mine, the Comsol Multiphysics numerical simulation based on finite element analyzes the geothermal temperature distribution characteristics and heating factors,and makes a verification of actual temperature hole and numerical simulation to study the geo-temperature distribution law of Xutuan Coal Mine and its influencing factors in the main mining area. At the same time, it calculates and obtains the geothermal flow value in the study area, draws a zoning map of the mine's heat impact degree, predicts the range affected by the heat hazard, and provides targeted measures for coal mine heat hazard prevention.

In order to reveal the acoustic emission energy and destruction characteristics of coal rock under uniaxial compression, a uniaxial compression test was performed on the 12-top coal and its basic roof of Buertai Coal Mine. Acoustic emission signal parameters of coal rock samples under uniaxial compression were collected and analyzed, and the differences between coal rock samples and acoustic emission impact curves and energy curves during uniaxial compression were obtained. The study found that the final failure modes of medium-grained sandstone and coal under uniaxial compression are significantly different. The medium-grained sandstone has a gentle failure process and destruction process of coal is fierce. The peak number of impact all appear before the peak of the stress curve, and the number of acoustic emission events of the medium-grained sandstone specimens is much smaller than coal specimens , which verified that coal samples are more severely damaged than medium-grained sandstone and provided ideas for early warning of dynamic disasters.

Aiming at the problem of severe signal attenuation and limited applicable depth of electromagnetic- while-drilling measurement in horizontal drilling in underground coal mine, the electric field components in layered lossy medium are solved with the propagation theory of electromagnetic wave in layered medium and the interpolation algorithm based on two-level discrete complex image method, and the current on drill pipe and electric field in coal seam are calculated by moment method of piecewise pluse functions and point matching, then the signal strength at pithead is obtained. Moreover, the 5-layer signal channel composed of basic roof, immediate roof, coal seam, immediate floor and the basic floor was built with the developed model. Then, the factors affecting signal strength were analyzed. The simulation results show that the signal strength increases first and then reaches saturation with the increase of the resistivity of coal seam and surrounding rock, while the coal seam has the most significant effect on the signal strength. Setting electrodes on the same side of the drill pipe, increasing the length of the lower drill pipe, reducing the contact impedance between the drill pipe joints and reducing the signal frequency are the effective methods to enhance the signal strength.

In view of the problem of uneven brightness and blurry and unclear lighting in surveillance video images caused by low brightness and serious dust in the underground environment, an algorithm to enhance the underground video image based on two-dimensional gamma function is proposed. The algorithm uses edge-preserving guided filtering to extract the light components, adjusts the light through the two-dimensional gamma function to achieve uneven illumination adjustment, and uses the restricted adaptive histogram equalization to adjust the contrast of the entire image. Thereby improving the clarity and amount of information of the surveillance video. Compared with the retinex and gamma algorithms, the proposed algorithm can combine the advantages of the two, and is superior to the above two algorithms in terms of information entropy, average gradient, and standard deviation. The results show that it can effectively improve the clarity, amount of information and contrast of the image, and at the same time alleviate the phenomenon of uneven lighting and dust blurred image in the underground, and improve the overall visual effect of the underground video surveillance.

The ecological restoration of coal gangue hill is a complex systematic engineering, which should not only consider the ecological restoration and management, but also take into account the long-term stability of the slope under complex natural conditions. Based on the engineering background of the gangue hill in Dishan village, this paper puts forward the key technical measures of ecological restoration and slope treatment in view of the existing environmental pollution and slope stability of the gangue hill. In this paper, the safety factors of gangue hill slope under three working conditions of natural, earthquake and rainfall are compared and calculated by using Lizheng slope stability analysis software. Midas GTS NX finite element simulation software was used to compare and simulate the displacement and stress fields of dangerous sections under natural and rainfall conditions. The calculation results show that the deformation range of gangue hill slope is mainly in the surface layer and coal gangue layer due to the influence of slope structure. With the time lapse, the subsidence of slope top and uplift of slope foot are accompanied. Under the natural condition, the gangue slope is in a stable state. Under the conditions of earthquake and rainfall, the safety factor of gangue mountain slope decreases obviously, which indicates that the natural conditions have certain influence on the stability of slope. Compared with the calculation, it is found that the deformation under rainfall condition is the most obvious, and the monitoring should be strengthened in the rainy season.

The preparation of pure low ash coal ultra-pure coal is the foundation of coal high value-added processing conversion and utilization. Low ash content and high yield of -1.4 g/cm3 haishiwan floating coal has the material conditions for the preparation of ultra-pure coal low ash pure coal. The composition and occurrence form of impurity minerals in low ash coal were studied by X-ray diffraction (XRD) and microscopic analysis of low ash coal with ash content less than 3%.It is found that the low-ash coal with ash content less than 3% can be obtained by gravity separation of haishiwan raw coal through the analysis of sieve floating-settling experiment. On this basis, grinding experiments are carry out under such conditions as selection of grinding method, grinding time, gradationmedium ratio and dispersing agent. The results show that wet grinding is better than dry grinding under the same conditions. When the particle size composition of grinding medium is smaller and the grinding time is longer, the grinding effect is better. With the addition of 0.55% sodium hexametaphosphate as dispersant, the mass ratio was 39.11%:23.57%:18.82%:18.50% when the diameter ratio of the grinding medium grinding gradation was φ30mm: φ25mm: φ20mm: φ15mm, wet milling for 4h and. At this time, the coal particles had been basically dissociated from the inorganic impurities. In this case, The the yield of cleaned coal was 19.08% and the ash content was only 0.88% by flotation of wet grinding of mineral.

Abstract：In order to reduce the environmental hazards of two industrial by-products, coal slime and high-sulfur petroleum coke, the coal-water slurry gasification process is used for its resource utilization. Methylene perylene naphthalene sulfonate (NNO) was used as a system. The dispersant for pulp was mixed with petroleum coke for pulping, and the influence of the amount of coal slime addition on the pulping concentration, rheology and stability of petroleum coke was investigated. The test results show that petroleum coke has good slurability. When the amount of dispersant NNO added is 0.8% of the dry base petroleum coke mass, the fixed viscosity concentration of petroleum coke is 67.63%; when the amount of slime is increased to 20% The slurry with a constant viscosity of 68.15% can be prepared. The slurry changes from swelling plasticity to pseudoplastic fluid, showing shear thinning characteristics. The water release rate after 7 days is only 4.11%, which is less than when no slime is added. The addition of slime improves the rheology of the slurry, improves the stability of the slurry, and facilitates the storage and transportation of the slurry.

Aiming at the problem of poor settlement effect of slime water in coal preparation plant, the settlement effect of slime water was improved by optimizing the settlement condition of slime water. Firstly, the industrial, particle size and XRD analysis were carried out on the slime water, and then the slime water settlement test was carried out to investigate the influence of the slime water concentration, pH and the amount of anionic polyacrylamide on the slime water settlement effect. On this basis, box-Behnken Design response surface method (RSM-BBD) was used to carry out conditional optimization tests, and a response surface regression model was established to study the influence of slime water concentration, pH, NPAM dosage and their interactions on the comprehensive index of slime water settlement. The results showed that the coal ash content was 59.46%, 90% of the coal slime particles were smaller than 26.85 μm, and the content of clay minerals was high. The concentration of slime water has the greatest influence on the comprehensive index, and the interaction between the concentration of slime water and NPAM dosage has the most significant influence on the comprehensive index; After optimization, the settlement conditions were as follows: coal slime water concentration was 45 g·L-1, pH was 9, NPAM dosage was 2.2 mL, and then the comprehensive index was 3.64 cm·s-1·NTU-1, which was very close to the predicted value of 3.68 cm·s-1·NTU-1.

Modern mining system for mining, Many security issues is still a problem. For mine hoist system,Is even more so. With today's hoist system to improve the degree of automation, the safety coefficient rises ceaselessly, but still have this or that security problems. Based on the hoist safety considerations and in other mining experience, we designed for hoist rope releasing protective system. The device can accurately, real time detection of hoist rope in the first run and stop when the state. In the hoist during operation, rope's loosing state, device through the wireless transmitting device transmits the data to the hoist control system to do the processing, to avoid accidents.

Water ring vacuum pumps are used in most of the mine gas extraction, and the temperature rise of pump shaft will not only shorten the life of the bearing itself, and lead to a sharp rise in the temperature of pump body, pump body with high temperature can cause the pump cavity internal corrosion, scaling and electrochemical corrosion problems, and it is a serious threat to extraction pump life and safe and efficient operation. Extraction pump shaft temperature changes are greatly influenced by quality of grease and fat injection rate, the current coal mine using extraction pump bearing mostly adopts the conical roller bearing, according to the actual circumstance of the macro rock mine gas extraction pumping station, calculate 2BEC water ring type vacuum pump uses the required cycle time and amount of theory on the conical roller bearing, combined with vacuum pump manufacturer given grease injection rate of the reference value, the scene with different fat injection rate to the observation records shaft temperature change, and the optimal lipid injection of the bearing is determined at a certain speed of gas extraction pump, which provides a powerful reference for the operation and maintenance of gas extraction pump station in coal mine.

Based on the data mining, taking Shendong company as an example, the change tendency of excavating level in nearly five years was summarized. A restriction list composed of geological factors, production organization, technical support, equipment matching, compensation, promotion personnel was analyzed, which found the key restriction factors of the tunneling efficiency. The improvement of tunneling efficiency was put forward such as the source and process control and management measures. The implementation results of shendong showed that the advance level of 2019 had increased by 22% ,compared with that in 2018. The average tunneling level for continuous miner reached 1289.3m per month, with the highest record 2208m per month. The bolter miner reached 632.6m per month, with the highest record 1101m per month. Without reducing tunneling, 5 excavation teams were saved to do the other mining construction, which was expected to save manpower cost 37.62 million yuan, equipment rental cost 30.83 million yuan. Shendong's case provided a solution for coal enterprises to safely and efficiently tunnel, reduce cost and increase efficiency, which enhanced the competitiveness of enterprises.

Abstract：Selecting coal companies listed on the Shanghai and Shenzhen A-shares from 2011 to 2019 as research samples, combining resource-based theories and modern housekeeper theories to study the relationship between technological innovation, executive power and corporate social responsibility. The results of the study show that technological innovation is significantly positively correlated with corporate social responsibility, and that executive power can positively regulate the relationship between technological innovation and corporate social responsibility performance. Further research found that compared with state-owned enterprises, the positive effect of technological innovation on corporate social responsibility and the positive regulation of executive power in non-state-owned enterprises are more significant.