Abstract: Xinjiang is an important coal resource reserve area and a guaranteed supply in China. Aiming at the problem of poor economy of coal transportation, based on the new changes of China's coal supply and demand situation and the development status of Xinjiang coal industry in recent years, this paper analyzes the coal demand in the main target markets in Xinjiang coal export areas in the future. The comparison of freight distance and market price between Hami and Jundong coal production areas of Xinjiang and the target market is sorted out, and the economy of Xinjiang coal transportation to different regions is studied. The research shows that the market price of coal in Hami and Jundong has been at a low level in recent three years, and there is a certain price difference between the market price of coal in Xinjiang and the target provinces of foreign transportation and Huanghua Port. When the market price of coal in Xinjiang maintains a certain difference value, it has a certain economy in Xinjiang.

Abstract: Taking the overall planning EIA of Taigemiao mining area in Xinjie, Shendong Coal Base as an example, this paper introduces that in the overall planning EIA of coal mining area, on the basis of fully investigating and identifying the overall planning layout of mining area and the environmental characteristics of surrounding groundwater resources, the relevant work of groundwater environmental impact demonstration and protection countermeasures has been carried out in depth. The relationship between the environmental protection of regional groundwater resources and the orderly development of mining areas is rationally coordinated.

The protective layer mining is an effective means to prevent coal mine rockburst disaster. The layout of the working face of the protected layer is vital for the effect of pressure relief and rockburst reduction. Regarding the layout method of protected layer working face in mines with rock burst, taking the close coal seam of Hulusiu Coal Mine as the research object, the vertical load model of the semi-infinite plane body is established, and the distribution characteristics of the high stress zone of the coal body of the protected layer are analyzed theoretically, and the layout of the working face of the protected layer is simplified to the selection of optimal horizontal offset L of the working face, A method for optimizing the optimal horizontal offset L based on the analytic hierarchy process is proposed, that is, to construct the AHP structural model of optimal horizontal offset L, to solve the weight matrix of each factor layer relative to the target layer, to establish the FLAC2D numerical model and to solve the value range of the horizontal offset, and to calculate optimal horizontal offset L within the value range by weighting. The research results show that: ① there are three high stress areas in the coal body of the protected layer, including one side of the goaf coal body area, two sides of the goaf coal pillar area and the stress recovery area, and two stress reduction areas with symmetrical distribution; ② The value range of horizontal offset favorable for main roadway excavation, maintenance and mining of working face is L=50~75m, L=80~140m and L=40~100m respectively; ③ Based on the AHP method, the horizontal offset that is beneficial to the excavation, maintenance and mining of the main roadway as a whole is L=60m. The research results can provide a reference for the layout of the protected coal face in similar conditions.

In view of the characteristics of high capacity, high speed and high strength of the main transportation system in super mine，the technical scheme is analyzed and studied，and the optimal configuration of belt conveyor is selected in all parts. A plurality of advanced technologies at home and abroad are adopted to optimize each specific link of the main transportation system：intelligent design technology is adopted to realize remote centralized control, cooperative operation and unattended operation of the main transportation system；using the design technology of super-large equipment, analyze and study the key positions and important components of the system to ensure safety；the underground coal-water separation technology is adopted to dewater raw coal to avoid the hidden trouble of "water coal"；the dynamic analysis technique was used to simulate the tension characteristics of the conveyor belt under various unfavorable conditions and optimize the equipment layout. Finally，the intelligentized，unmanned and long-term continuous and stable operation of the coal main transportation system with the longest underground total transportation distance and the largest installed capacity in China is realized，and the leading and exemplary function is played for the design of the coal main transportation system of the super mines in China.

In order to promote the intelligent transformation and upgrading of coal mines, improve the safety production level of coal mines, and enhance the core competitiveness of coal mining enterprises, the intelligent upgrade design of the ground production centralized control system of Shengli Energy Storage and Transportation Center has been carried out. On the basis of improving equipment reliability and industrial automation level, using modern information technology and artificial intelligence technology as means, starting from the integration and utilization of full process information resources, relying on automation, informatization, and intelligent control platforms, taking into account the actual production, management, and sales situation of the storage and transportation center, the overall architecture of the intelligent storage and transportation center's "execution layer, management layer, decision-making layer, and platform layer" is formulated, Establish a business control management system at two levels of "platform collaborative operation and factory intelligent production", analyze, explore, and leverage the value of data sources through machine learning models and optimization algorithms, and achieve intelligent production, control collaboration, and service model innovation throughout the entire business process of the storage and transportation center.

Most of the large and medium-sized mines in China, especially those located in cold regions, are using shaft towers as shaft hoisting systems. The shaft tower, however, is one of the most important industrial structures in the production of coal mine. From the perspectives of the layout, the overall structural analysis and the fundamental design of the main shaft tower system in Tarangaole Mine, with further reference to the practical design and construction experience, this paper introduces some key points and considerations concerned with the main shaft tower design, and is intended to provide design parameters and experience for the construction of the shaft tower on a foundation of freezing-thawing soil by artificial rapid thawing, and give reference and assistance for the design of the main shaft tower in coal mines.

Mine construction is the primary project of coal mining, and inclined shaft is one of the ways of mine development. Inclined shaft has the advantages of continuous main operation and no need for replacement. TBM has the characteris-tics of safe construction, high degree of automation and fast driving speed. TBM has become an important driving equipment for mechanization, automation and intelligent construction of inclined shaft engineering. The weakly con-solidated formation in western China has the characteristics of low strength of surrounding rock and poor bearing ca-pacity. It is easy for TBM to have such risks as cave-in, stuck machine, planting head and driving deviation when it passes through broken formation. Therefore, the research on open TBM driving technology and coping method of the broken stratum in the west coal mine is carried out. Based on the stratum and engineering conditions of the inclined shaft crossing in Kekegai Coal mine, the adjustment scheme of TBM driving parameters adapted to the stratum condi-tions is developed, and the control methods of cutter speed, boot pressure, cutter torque and advancing speed are put forward. This maximizes the performance of the TBM for efficient tunneling. The integrated surrounding rock rein-forcement methods such as steel arch, advance grouting and anchor mesh support are put forward when inclined shaft passes through broken stratum. The configuration scheme of auxiliary operation equipment and the flow of driving operation are optimized. The construction technology of broken stratum safety, which includes grouting reinforcement, strong support of surrounding rock and equipment coordination with excavation, guarantees the safety and fast excava-tion of the open TBM of broken stratum in Kekegai mine.

Based on the engineering background of goaf retaining roadway in Shendong mining area, the optimization of the ratio of coal gangue concrete backfill was systematically studied by the methods of theoretical analysis, laboratory test and numerical simulation, and the characteristics of surrounding rock deformation and backfill stress distribution in the mining process were analyzed. The main conclusions show that the use of coal gangue concrete backfill wall support, high prestress, strong anchor bolt and anchor cable as the basic support in the roadway can effectively control the deformation of surrounding rock along goaf retaining roadway and maintain the stability of retaining roadway. Based on the laboratory test and numerical simulation, the relationship between the optimal mix ratio of coal gangue concrete and the basic support inside and beside the roadway is analyzed. Finally, the optimal support scheme is optimized and the design principle of deep goaf-side roadway retaining support is proposed. It can provide reference for similar engineering geological conditions.

Aiming at the problem of controlling the deep roadways of coal and mudstone surrounding rock, the transportation roadway of a coal mine was chosen as the research object, combined with field investigation, numerical simulation, and theoretical analysis methods, the displacement and stress distribution characteristics of the surrounding rock of deep roadways within coal and mudstone layers were analyzed. The main structure and principle of the inner and outer bearing structures circular collaborative control technology applicable to the surrounding rock of deep roadways within coal and mudstone layers were studied. A constrained concrete support and surrounding rock coupling model was constructed, and the displacement and plastic zone distribution characteristics of the surrounding rock of deep roadways within coal and mudstone adopting the inner and outer bearing structures were analyzed. The industrial tests were conducted and the controlling effect is good, providing a certain reference for the stability control of surrounding rocks in similar roadways.

In order to study the dynamic mechanical properties of mining bolt under impact load, the commonly used bolt materials for rock burst roadway in Inner Mongolia Shaanxi mining area were selected. The static and dynamic mechanical properties of the bolt were tested using AW-1500 microcomputer controlled electro-hydraulic servo testing machine and drop hammer impact testing machine, and the bolt load displacement curve, impact force time history curve, displacement time history curve and other data were obtained. It is found that the time history curve of bolt impact force can be divided into three stages: sharp increase stage, stable stage and attenuation stage. With the increase of impact times or impact energy, the peak impact force of the bolt increases gradually, and the impact force of the bolt is stable between 200kN~300kN. When the bolt reaches the impact breaking point, the peak impact force is between 250kN~300kN. Under the impact load, the necking of the breaking position of the anchor rod is not obvious, showing obvious brittle fracture characteristics. The dynamic breaking load is slightly greater than its static breaking load, while the elongation is greatly reduced, and the elongation after fracture under dynamic load is about 10%. The research results can provide some experimental basis for the design and material selection of rockbolt support in rock burst roadway.

In view of the difficulty in gas control of blasting operation in underground coal mines, Tunbao Coal Mine conducted design and research during the construction of winch chamber and gas drainage chamber in the W Ⅱ 02040502 working face. Through optimizing the construction process by using the mine gas drainage system, cooperating with the setting of protection and the building of gas chambers, and innovating the construction method, the gas control is good during the blasting operation. On the basis of meeting the relevant national regulations, the toxic and harmful gas is effectively controlled, while greatly reducing the operation time, ensuring the premise of construction safety, and increasing the work efficiency. No gas overrun accident occurred during blasting operation, which proves that the method is safe and effective.

In order to study the bearing characteristics and reasonable width of the filling body beside the gob-side entry retaining in inclined coal seam, taking the gob-side entry retaining in the left seventh working face of Xintie Coal Mine in Heilongjiang Province as the background, the theoretical analysis method was used to analyze the dynamic impact and static pressure of gangue, and the influencing factors of dynamic impact and static pressure were clarified. The numerical simulation software was used to analyze the stress distribution and deformation characteristics of the surrounding rock of the gob-side entry retaining under the width effect of the filling body, reveal the bearing characteristics of the filling body and determine the reasonable width of the filling body. Finally, the engineering application was carried out. The results show that the dynamic impact of gangue on roadside filling body increases with the increase of gangue quality, mining height and coal seam dip angle, and decreases with the increase of collision time and slip length. The static pressure effect of gangue on roadside filling body increases with the increase of gangue bulk density, coal seam dip angle, mining height and working face length. The minimum width of the roadside filling body is calculated to be 1.36 m by the theory. With the increase of the width of the filling body, the bearing capacity and deformation resistance of the filling body gradually increase, and the 'elliptical elastic core ' which is biased towards the goaf is formed inside the filling body. Finally, the width of the roadside filling body is determined to be 2m. The engineering application shows that the deformation of surrounding rock of gob-side entry retaining is small by using the parameters of roadside filling body, which meets the needs of daily production.

The underground coal fire disaster is serious in China and continuous combustion of coalfield fire area poses great hazards. The traditional water injection method is unscientific with huge engineering quantity and low efficiency which resulting in plenty of water waste. Water injection technology in coalfield fire area needs to be developed in the direction of real-time data monitoring and automatic injection allocation. Intelligent injection technology is studied. Temperature parameter acquisition module, circuit control module and flow control valve are integrated in the intelligent injection distributor and placed on the ground for a long time. Combining with wireless communication technology and automatic adjustment algorithm, an intelligent injection process including intelligent injection distributor, intelligent measurement control and charging integrated instrument and ground communication control host was developed. The monitor system is developed to adjust the operation time of water injection and temperature measurement process remotely to control the water injection process The hierarchical control of water injection flow of 2L/s, 1L/s and 0.5L/s is realized. Sandaoba coalfield fire area test in Xinjiang Province shows that the intelligent grading water injection technology can provide technical support for "intelligent" fire extinguishing in coal fire area.

Aiming at the problem of visual clarity of monitoring video in underground working face, this paper first proposes a dust-proof automatic drainage method for monitoring camera. The hydrophobic coating is used to prepare the camera window, which can effectively reduce the adhesion of coal dust and water mist, and improve the visual monitoring effect of monitoring video screen. Aiming at the problem of monitoring video image quality degradation caused by dust fog under working condition of working face, a real-time defogging algorithm for monitoring video image is proposed. After real-time defogging, the peak signal-to-noise ratio of the monitoring image is maintained at about 28.2, which makes the feature information of the monitoring image well maintained and enhances the visual effect of the working face monitoring. In the research process of visual distortion correction technology of surveillance video image, a correction method of surveillance video image in working face is proposed, which makes full use of the internal feature information of video image and realizes the edge distortion correction of surveillance video image without external calibration. Experiments show that the working face monitoring video clarity technology proposed in this paper can meet the actual production needs to a certain extent and improve the visualization effect of working face monitoring video.

In order to improve the recovery efficiency of coal resources at the end wall of Hongshaquan open-pit mine, to avoid the waste of coal at the end wall. Taking the west end wall of the first mining area in Hongshaquan open-pit coal mine as the research object, by combining with the principle of the highwall mining system, the width of supporting coal pillar and isolating coal pillar were studied, and the slope stability of the west end slope under natural working conditions and the condition of the end shearer with coal pillar were analyzed as well. The results show that the width of supporting coal pillar is 5.5m and isolating coal pillar is 27.3m by the calculation formula given by Mark-Bieniawsk. The stability coefficient of the west end slope is 1.957 under natural working conditions, and 1.805 after excavation with the highwall mining system, but both of which meet the requirements of the open pit design code. Hongshaquan open pit Coal mine has the conditions to use the highwall mining system, which can solve the problem of coal mining with end wall covering.

the evolution of mechanical response of coal and rock is the root cause of coal and rock disaster. It is of great sig-nificance for safe and efficient production of coal mine to clarify the evolution law of mechanical response of coal and rock in stope. Based on the engineering background of longwall fully mechanized mining face of a mine, this paper adopts the method of physical similarity simulation and numerical calculation to study the step change rule of static mechanical response of coal and rock under the influence of structural transient on the basis of comprehensively determining the distribution characteristics of abutment pressure before and after coal mining. The results show that the overlying rock spatial structure is composed of rock strata with different lithology outside the fracture plane and within the mining influence range, and is the internal cause of the different mechanical response of coal and rock in the mining influence range. During the compression period, along with the accumulation of quantitative changes in the progressive evolution of mechanical properties such as boundary conditions and geometric properties within the overlying rock spatial structure such as coal excavation, instantaneous instability of the sub-system of the overlying rock spatial structure such as hard rock breaking occurs during the compression period, and then transient mechanical properties of the overlying rock spatial structure occur. Under this influence, the mechanical response of coal and rock in the stope is transient, the peak abutment pressure decreases sharply, and the peak position transitions to the front of the working face, forming a positive and negative step change zone. Based on the instantaneous fracture characteristics of hard rock, a numerical simulation pre-treatment method for the instantaneous fracture of hard rock is established. By this method, the spatial structure of overburden rock and its mechanical response transients can be quantitatively studied.

In order to ensure the safe and efficient production of the rock burst mine, the anchor cable support and borehole blasting are adopted to ensure the safety and stability of the surrounding rock of the roadway. The paper is based on the 402102 working face of Hujiahe mine, the Anchorage Force, working resistance and damage of surrounding rock structure are analyzed by numerical simulation and field test. The results show that the failure of anchoring force has little relation with the relative position of the pressure relief hole, and the loss of pre-tightening force is consistent between before and after the pressure relief, basically between 40% and 50% , the working resistance of the cable is basically unchanged, which is 101.6 kn and 99.4 kn respectively, but it has some influence on the structural integrity of the surrounding rock, and there is a certain relationship between the structural deterioration area and the blasting pressure relief hole, it can provide reference for the optimization of pressure relief of subsequent blasting.

The stability control of surrounding rock in coal roadway is the key to ensure the safe and efficient mining of coal mine. In this paper, machine learning method is introduced to predict the roof displacement of coal roadway in advance. Firstly, eight important influence indexes of roof displacement of coal roadway are se-lected, and the prediction database of roof displacement of coal roadway is established, and the correlation and importance of the data are analyzed. Then, based on RF, GA-SVM and GA-ANN, three kinds of coal roadway roof displacement prediction models were established respectively, and RMSE, MAE and R2 were selected to evaluate the performance of the models. The results show that the RF model has the best test performance, R2 = 0.909, RMSE = 20.475, MAE = 16.790, while the GA-ANN model has the worst performance. The ten-fold cross-validation method was used to verify the reliability of the RF model and the GA-ANN model, and it is found that the stability of RF model is higher, with an average R2 of 0.891. Finally, the RF model is applied to the 2-1121 roadway of Ganhe Coal Mine. The absolute error between the predicted value and the actual value is 19 mm, and the relative error is 11.18 %. The RF model makes a relatively accurate prediction of the roof displacement of the coal roadway.

In view of the water damage threat of Ordovician limestone karst in the complex structure area of the North China type coal field, the water inburst coefficient evaluation method and grouting reconstruction (reinforcement) treatment technology have not considered the impermeability evaluation performance of the ancient weathering crust in the Ordovician limestone roof. Based on the study of the physical characteristics of the ancient weathering crust on the top of the Ordovician limestone. Under the guidance of the idea of “aquifuge index method”, a aquifuge index method based on fractal theory was proposed to evaluate the impermeability property of paleo-weathering crust. The evaluation process was created and applied in the southern study area of Fengfeng mining area. The results show that the weak and weak impermeability areas of the paleo-weathering crust in the study area are distributed in strips in the middle and southwest of the mine field. The strong and strong impermeability areas are distributed in the northern and southern boundaries of the mine field, and the other areas are medium impermeability. This method can effectively reduce the number of descriptions of structural elements in the traditional evaluation methods, and can also quantitatively evaluate the complexity of fault network. It has theoretical guiding significance for the study of the impermeability of the ancient weathering crust in the North China type coalfield

In order to improve working conditions of transfer and crushing zone in fully mechanized caving face, the dust distribution characteristics of the transfer and crushing point are mastered by dust dispersion analysis and field measurement firstly, and four main dust producing points and their causes are obtained. The PM5 of the dust at 1m of the reversed loader head accounts for 85.19%. After the coal and the belt conveyor hit violently, a large amount of respirable dust is produced. The PM10 proportion of dust at the crusher can reach 98%, which comes from the gap between the two protective cover due to the connection not matching. The dust particle size distribution is rel-atively uniform at the front and back passes, mainly because the coal is generally larger and carries higher potential energy, and a large amount of dust is generated after the fall. Respirable dust is continuously generated at 1m of the reversed loader head. A large amount of respirable dust is also produced at the crusher, but the rate of accumulated respirable dust is relatively slow, and the proportion of inhalable dust at the front and back passes is relatively sta-ble and high. Then according to the characteristics of each dust production point, different spray dust reduction system is used and the corresponding dust reduction device is designed. The transfer point spray system forms a full-section spray dust suppression, the crusher spray system seals the dust in the crusher and settles, and the front and back passes spray system uses fog to completely cover the dust. Finally, through field inspection, it has a good dust reduction effect.

Deep geological storage is the most promising way of high brine and carbon dioxide geological storage. Based on the borehole database, combined with the terrain and geological data, the 3D geological modeling software Surpac is used to construct the 3D geological model for Dongsheng coal field in northeastern Ordos basin. The data of 8 deep wells with a depth greater than 2000m underground in the study area are collected in the model. A deep ground model covering the area of deep geological storage in northeastern Ordos basin was constructed. Based on the detailed analysis of the geometric characteristics of the strata distribution in the model, combined with the core test analysis results of the demonstration project, the occurrence forms, favorable characteristics and changing characteristics of the deep geological storage potential reservoir Liujiagou formationin the study area are summarized. The main conclusions are as follows: (1) In the study area, the formation thickness of the Liujiagou formation changes little, but in general, the southwest side of the Liujiagou formation is deeper and thicker than that of the northeast side, and the potential sealing space is larger，the scientific practice of deep geological sequestration can be actively carried out in this region; (2) The existence of arkose in Liujiagou formation provides micro-fracture space for storage, which is an important feature of the target layer for storage. According to the results of three-dimensional geological modeling, the overall thickness of Liujiagou formation in the study area is between 277m-460m, and the potential storage space can reach 2.79 million km3; (3) Due to the few number of demonstration projects, the model could provide a reference of the depth and thickness changes of Liujiagou formation in the region that lack drilling data under the background of a small amount of drilling data.

Due to the blurred camera video caused by dust and water mist in the production process of comprehensive working face, the collision detection of shearer and hydraulic support cannot be normalized through video, which limits the practicability of intelligent mining technology. Based on the high-precision geological model of the comprehensive working face, the adaptive mining system issues the planned mining height data of the shearer, combined with the mining height sensor data of the shearer and the height sensor data of the hydraulic support, and carries out collision detection and early warning of the shearer drum and hydraulic support in real time, and the shearer traction stops after the early warning is triggered, and the adaptive mining system pops up a video window that triggers the collision detection support, and the shearer continues to adapt to cut coal after the alarm is manually processed and eliminated. The results show that the method correlates the relative coordinates of the shearer and the hydraulic support of the comprehensive working face with the absolute coordinates of the geological model, and realizes the early warning based on the height sensor data of the hydraulic support of the comprehensive working face and the planned cutting data, which greatly improves the accuracy of collision detection and early warning of the shearer and the hydraulic support of the comprehensive working face.

Mine video surveillance plays a key role in ensuring the production safety of coal mining enterprises. At present, mine intelligent monitoring technology mainly processes monitoring data in the cloud, which has problems such as network congestion and high computing requirements. In response to this problem, the overall architecture of edge-cloud collaborative mine video monitoring was studied, and an adaptive video frame offloading strategy based on task offloading was proposed. The advantages of edge detection speed, high accuracy, and strong real-time performance were used to optimize and update the model. Realize the continuous improvement of edge-cloud collaboration architecture. In view of the low detection accuracy of the YOLOv5 model, and the deep network structure is prone to gradient disappearance and over-fitting, Transformer is applied to the visual field and faces the problem of multi-scale unrecognizability of the same target and the sequence of high-resolution images is too long and requires a large amount of calculation. Due to the problem of insufficient video memory resources, a target detection model based on Swin Transformer-YOLOv5 was constructed. Experimental results show that the target detection model based on ST-YOLOv5 improves the average detection accuracy and is suitable for the deployment of edge devices on mine intelligent working surfaces.

Coal spontaneous combustion in open pit poses a great threat to coal resources, surrounding environment and safety production. Coal fire detection in open pit mine is of great significance. A method of day and night surface temperature fusion is proposed to detect coal fire in open pit by combining with other surface anoma-lies caused by spontaneous coal combustion. The method obtained the surface temperature during the day and at night respectively, and eliminated the influence of solar radiation and other factors through algebraic super-position to highlight the persistent thermal anomaly area. Based on the surface temperature anomaly, a two-stage band-pass filter of settlement anomaly and ecological anomaly is made to filter the surface temperature anomaly, and the distribution characteristics of coal fires in the study area are integrated. The research shows that the fusion of day and night surface temperature information is more effective than the single time-phase temperature detection method of coal fire. For the surrounding areas of open pit mine, the combination of thermal infrared remote sensing technology of day and night surface temperature fusion and radar interferom-etry technology and remote sensing ecological index method of coal fire detection has higher reliability and accuracy.

The coal mine electrical substation is an important part of large coal mine power supply system, and the accurate recognition of pressure panel switch state of electrical substation is a crucial aspect of the detection of power supply status in coal mines. However, the increasing number of pressure panel switches on substation cabinets has made traditional manual inspections and visual inspections inadequate due to challenges with data management and inspection quality control. In view of the above problems, a recognition method for the operating state of substation pressure panel switches was proposed in this study, which was based on YOLOv5 neural network model. In this study, the Pytorch deep learning framework was employed for model training and the method also included a preprocessing algorithm for images of the panel switches. The resulting best performing model was capable of detecting pre-processed images of the panel switches and evaluating the detection results. Experimental results demonstrate that the proposed method has the characteristics of fast detection speed and high accuracy.

Reactive polymer material is a kind of material with special properties. In recent years, its demand has gradually increased, and its safety and environmental protection have also attracted much attention. This detailed description investigates the application of reactive polymer materials in coal mines in China, including their usage scenarios, chemical properties, construction services, and access conditions. Furthermore, the analysis and study of safety management issues and the proposal of countermeasures aim to enhance the safety level of reactive polymer materials in coal mines.To meet safety requirements, it offers significant scientific backing and valuable insights on the secure application of novel technologies and materials, based on objective theories and safety practices.

To improve the water retention performance of fly ash, a fly ash slurry containing hydrophilic colloids was prepared by adding different mass ratios of xanthan gum (XG) and konjac gum (KGM) hydrophilic colloids to the fly ash slurry. The material's cementitious properties, stability, and rheological properties were tested, and its gelation mechanism was analyzed. The results showed that the gelation state of XG/KGM hydrophilic colloidal fly ash slurry varied with different mass ratios. When the mass ratio was greater than 4:6, the fly ash slurry can gelation, and the lowest thermal water loss rate was 18.14% at 120℃. The stability was good, and the absolute Zeta potential values were all above 20mV. The maximum mass loss at 1000℃ was about 6.27%; The rheological experiment showed that there was shear thinning phenomenon in all coal ash slurry, which was a pseudoplastic fluid. The Herschel-Bulkley model was used for fitting, and the R2 was above 0.99; The energy storage modulus G’ was higher than the loss modulus G”, indicating that the fly ash slurry mainly had elastic properties; When the mass ratios of the three groups that can form gels were 6:4, 8:2, and 10:0, irregular block and sheet shaped hydrophilic colloids can be observed on the surface of the samples; The gelation mechanism indicated that complex interactions can occur between fly ash and XG, XG and KGM, thereby promoting the gelation of fly ash slurry.

Coal Gasification Fine Slag (CGFS), the leading solid waste of the coal chemical industry, mainly consists of silica-aluminate and residual carbon. Currently, the common conversion strategy of CGFS is to obtain residual carbon after enhanced separation to prepare porous carbon materials or synthesize zeolite using silica-alumina fractions. Simultaneously, using silica-alumina particles and residual carbon resources in CGFS has great potential and research significance. CGFS was used as raw material to prepare composite adsorption materials by hydrothermal alkali solution. The effects of hydrothermal time, alkali concentration, hydrothermal temperature, and stirring time on the ammonia nitrogen adsorption characteristics of composite materials were explored by designing orthogonal experiments. The structure–activity relationship between composite materials and adsorption capacity was determined by analyzing the composition, apparent morphology, and pore structure of composite adsorption materials under different preparation conditions. The results showed that the composites generated a zeolite structure with P-type zeolite as the main crystalline phase. When the hydrothermal time is 30 hours, the hydrothermal temperature is 100℃, the stirring time is 10 minutes, and the alkali concentration is 2 mol/L, the composite adsorption material obtained the highest adsorption capacity. When the initial ammonia nitrogen concentration is 100 mg/L and the adsorption time is 5 hours, the equilibrium adsorption capacity of the adsorption material for ammonia nitrogen reaches 15.65 mg/g. The isothermal adsorption characteristics of the adsorption material for ammonia nitrogen followed the Langmuir equation, and the reaction process followed the quasi-second-order kinetic equation. Thermodynamic analysis showed that the adsorption reaction of CGFS on ammonia nitrogen was spontaneous, endothermic, and entropy-increasing.

[Objective] In order to solve the scraper conveyor in the process of transporting coal, the scraper chain system will produce three-body wear resulting in chain ring wear inefficiency. [Processes and methods] In this study, the abrasive wear test was carried out by abrasive wear testing machine, and the abrasion characteristics and wear resistance of three kinds of scraper conveyor chain ring materials (YXKB2 steel, 54 steel, and 25MnVK steel) were analyzed by orthogonal test as well as one-way test with different factors (abrasive ratio, abrasive grain size, and hardness of the chain ring materials). [Conclusions] The test results show that the effect of abrasive ratio on the amount of material wear is the most significant, and the coupling effect of abrasive ratio and abrasive grit size is the second most significant. Under equal mass abrasive conditions, the wear of YXKB2 steel decreases with increasing abrasive grit size, but in the three-body wear process, abrasive fragmentation leads to a non-significant effect of abrasive grit size on material wear. The hardness of the three chain ring materials was positively correlated with the wear resistance. Within the range of test conditions, the wear resistance of the three materials is YXKB2 steel, 25MnVK steel, and 54 steel in descending order. This study is of guiding significance for selecting the chain ring material with the best wear resistance.

This paper innovatively proposes the use of BP neural network to study the rapid estimation model of equipment price. Taking the belt conveyor as an example, based on the analysis of the main influencing indicators of the belt conveyor price, the BP neural network is applied to the establishment of the rapid estimation model of the belt conveyor. Based on the purchase price of the general contracting belt conveyor of Z design institute, the BP neural network equipment price rapid estimation model is tested. The research shows that the model can greatly improve the efficiency of equipment price quotation without losing accuracy, especially for the solution of multi-parameter and complex general equipment quick quotation problem with long inquiry period. It can save the equipment quotation time from several days to several minutes. By establishing the quick quotation model of equipment price, it can get rid of the influence of subjective and objective factors such as too few inquiry manufacturers, lack of contrast or intentional deviation of quotation manufacturers ' quotation from normal price on the pricing accuracy of equipment price in the process of equipment price inquiry.