853 results about "Pit water" patented technology

The invention relates to the technical field of coal mine water disaster prevention and control, and particularly discloses a hidden structure detection system for mine water disaster intelligent monitoring, early warning and prevention, which is used for solving the problems of low mine hidden structure detection precision, mine water disaster early warning lag and large seismic wave propagation path simulation error. Comprising a multi-source data comprehensive detection module, a real-time imaging module, a micro-seismic multi-scale intelligent analysis module, a seismic wave signal identification module, a regional difference analysis module and an intelligent data processing module. According to the invention, through fusion of multi-source data, real-time imaging, micro-seismic analysis, seismic wave identification and intelligent data processing technologies, precise detection of a mine hidden structure, high-precision prediction of mine earthquakes and water disasters and real-time risk early warning are realized, and timeliness and accuracy of mine water disaster prevention and control are improved.

The invention discloses a coal mine geological disaster and environment early warning method based on multi-source monitoring data fusion. The method comprises the following steps: determining a mine water disaster early warning evaluation index, a mine pressure disaster early warning evaluation index and a geological environment evolution early warning index; a corresponding first early warning threshold value is set; data are acquired and preprocessed, and a mine water disaster early warning model, a mine pressure disaster early warning model and a geological environment evolution early warning model are established; collecting new data to carry out iterative optimization on the model, and correcting an early warning threshold value; and integrating the iteratively optimized models into an early warning index system library, collecting and fusing various monitoring system and production dynamic data of the mine, and inputting the data into the early warning index system library for coal mine geological disaster and environment early warning analysis. The method solves the problems that in the prior art, multi-source monitoring data cannot be fully fused, an early warning model lacks self-learning and optimization capabilities, and an early warning threshold cannot be dynamically adjusted along with the change of a mining environment.

The invention belongs to the technical field of safe mining of coal mines, and relates to a hydraulic fracturing roof-cutting entry retaining method based on a crushing agent, which comprises the following steps of: calculating to obtain a target fracturing horizon height h of roof-cutting entry retaining according to a working face height M and a residual crushing coefficient KZ of a roof; calculating the crack initiation pressure P of a target fractured position of the roof-cut entry retaining according to the rock stress P * and the tensile strength R of the rock at the fractured position of the roof-cut entry retaining; drilling is conducted according to the drilling position, the drilling length L and the drilling angle alpha; the prepared BC-efficient soundless cracking agent flowable pasty slurry is injected into a drill hole through a hydraulic fracturing system and is fractured at a target fractured layer, and after the BC-efficient soundless cracking agent flowable pasty slurry is subjected to standing reaction, the drill hole is fractured for multiple times in a single-hole retreating mode. The problems that a large amount of water resources are consumed, the rock permeability is possibly increased due to high-pressure water injection, and mine water disaster hidden dangers are caused are solved.

The invention discloses a mine water recharge reservoir scaling trend prediction, scale removal and permeation enhancement method, and the trend prediction method comprises the steps: carrying out the conventional physicochemical index analysis of the water quality of mine water and a monitoring well according to the hydrogeological information of a recharge reservoir, and calculating the scaling trend of the mine water recharge reservoir based on a Retino index method and the relative saturation R.S. The scaling conditions of carbonate, sulfate and silicate are rapidly judged respectively; when scaling occurs, the ion concentration change on a path is revealed through a Transport module and an Equilibrium Phases module in the PHREEQC software, and verification is carried out through a measured value of a monitoring well; and then according to the mineral dissolution precipitation reaction and the percentage of the reservoir rock sample composition, calculating the reaction dose and the void ratio so as to formulate a mine water recharge reservoir permeation enhancement optimization scheme. According to the method, the scaling trend of the mine water recharge reservoir can be effectively predicted, the recharge process is monitored, and continuous operation of deep well recharge sealing work of mine water is facilitated.

The invention discloses an adsorption coupling contact precipitation defluorination system and a defluorination method, and the method comprises the following steps: feeding fluorine-containing mine water into a defluorination reaction tank, and carrying out adsorption defluorination on the fluorine-containing mine water through a defluorination filter material layer to obtain first defluorination mine water; feeding the calcium agent and the phosphorus agent according to the formula ratio into a fluorine removal reaction tank, removing fluorine through a catalytic reaction to obtain second fluorine-removed mine water, and then feeding the obtained second fluorine-removed mine water into a clean water tank; when the head loss of the second defluorination mine water exceeds a threshold value, feeding backwashing water and backwashing air into a defluorination reaction tank, and backwashing a filter material in a defluorination filter material layer; feeding the regenerated liquid into a defluorination reaction tank, soaking a defluorination filter material layer for 10-12 hours, and then discharging generated waste liquid into a lime reaction tank. According to the method disclosed by the invention, through adsorption, contact precipitation and regeneration, the carbon-based apatite adsorbed with fluorine ions in the defluorination reaction tank is used as a seed crystal for subsequent contact precipitation, so that the service time of a filter material in a defluorination filter material layer is effectively prolonged, and the regeneration frequency of the filter material is reduced.

The invention relates to an intelligent control system and method for mine water underground treatment, a medium and electronic equipment.The system comprises a water quality online monitoring module, an automatic control module, an intelligent chemical adding module and a calibration optimization module, and the system responds to mine water quality changes in real time based on mine water quality online monitoring data and a chemical adding prediction model; the agent adding strategy is dynamically adjusted, accurate agent adding is achieved, the mine water underground treatment effect is effectively improved, the operation and maintenance cost of an underground treatment system is reduced, and the reliability is improved. The control system disclosed by the invention has relatively high automation and intelligence levels, can adapt to complex water quality conditions and large-scale mine water treatment requirements, provides an efficient, economic and environment-friendly solution for mine area water resource management, and has a wide application prospect.

The invention relates to the technical field of mine safety monitoring and geophysical exploration, in particular to a mine water disaster intelligent alarm system responding to multi-dimensional physical field parameter abnormity, which comprises a full-space data acquisition module for acquiring monitoring area observation data and calling a background geological physical model; the ideal reference reconstruction module is used for constructing an ideal physical field reference in a non-abnormal state; the double difference extraction module is used for calculating an observation residual error of observation data relative to a reference and a theoretical residual error of simulation response relative to the reference; the inversion coupling verification module is used for driving the theoretical residual error to approach to the observation residual error and extracting parameter sensitivity characteristics; the intelligent alarm judgment module is used for analyzing sensitivity characteristics and convergence states; generating an alarm instruction if the feature is determined to be the entity fluid abnormal feature; if it is determined that the target abnormal interference feature is not the target abnormal interference feature, signal suppression processing is executed; according to the invention, the false alarm rate of mine water disaster detection is greatly reduced.

The invention relates to a preparation method and application of a mine water flocculation agent with an adsorption function. The mine water flocculation agent is prepared from the following raw materials: a mineral material, chitosan, water, silicate, acid, aluminum chloride salt, ferric chloride salt and polyacrylamide. The preparation method comprises the following steps: carrying out heat treatment on a mineral material, then adding water and chitosan, then adding silicate, reacting to generate polysilicic acid, grafting the polysilicic acid on chitosan macromolecules, then adding aluminum chloride salt and ferric chloride salt, reacting, finally adding polyacrylamide, and aging to obtain the composite material. The mine water flocculating agent provided by the invention can synchronously remove suspended matters, fluorides and COD (Chemical Oxygen Demand), and has the advantages of low dosage, short reaction time and high settling speed.

The invention relates to the technical field of mine solid waste treatment and carbon dioxide sealing and storage, and particularly discloses a system and a method for sealing and storing carbon dioxide by utilizing coal-based solid waste and mine water to prepare slurry. The system comprises a cement bin, a gangue bin, a coal ash bin, a gasified slag bin, a mine water storage tank, a stirring reaction kettle, a carbon dioxide storage tank, a slurry temporary storage tank, a vacuum pump and a slurry pump, and the stability and adsorption efficiency of carbon dioxide fixation are improved in the mode that coal-based solid waste, mine water and carbon dioxide are subjected to chemical reaction and physical adsorption; meanwhile, the prepared backfill slurry has high-strength anti-pressure ability, the stability of the backfilled underground goaf is better improved, further, coal-based solid waste and mine water are utilized for waste recycling, and the carbon dioxide storage cost is reduced.

The invention relates to the technical field of mine water treatment, and discloses a treatment method of high-calcium-hardness mine water. The method comprises the following steps: (1) adjusting water chemical components of the mine water, so that the pH value of the mine water is 8-10, the mass ratio of sodium ions to calcium ions is 1: (4-8), the TDS is 7500-8000 mg / L, and the concentration of bicarbonate ions meets the following conditions: the required concentration of the carbonate ions is calculated according to the solubility product of calcium carbonate; the concentration of the bicarbonate ions is 90% twice the calculated concentration of the bicarbonate ions; and (2) adding gypsum into the mine water obtained in the step (1) to carry out first induced crystallization so as to remove calcium ions in the mine water. The method provided by the invention is used for treating the high-calcium-hardness mine water, can adapt to different inflow water qualities, and further improves the removal rate of calcium ions. The method provided by the invention can effectively ensure that the Ca < 2 + > content of the effluent quality of the mine water reaches the standard, can also reduce the secondary environmental pollution problem, and is low in energy consumption.

The invention relates to a mine water depth sealing layer site selection evaluation method and system based on multi-parameter coupling. The method comprises the following steps: acquiring geological, hydrological and engineering parameters through geological exploration equipment and the like, and carrying out wavelet transform noise reduction and Kriging interpolation processing; determining a key parameter set and weight by using an analytic hierarchy process, constructing a comprehensive evaluation model coupling the analytic hierarchy process and fuzzy mathematics, and generating a membership matrix and a multi-field coupling numerical model; and calculating a fitness index through spatial overlay analysis, generating a sealing suitability partition map, outputting an evaluation report containing risk early warning, and generating an interactive three-dimensional site selection decision interface. The system comprises a data acquisition and preprocessing module, a parameter processing module, a weight distribution module and the like. The simulation precision and the risk positioning efficiency are improved, and a comprehensive evaluation scheme is provided for site selection of the sealing layer of the water depth of the mine.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a composite material as well as a preparation method and application thereof. According to the composite material, blended hydrogel of sodium alginate and polyvinyl alcohol is used as a matrix, zeolite molecular sieves, activated charcoal and zero-valent iron particles are embedded into the matrix to form microspheres, sulfate reducing bacteria are immobilized on the surfaces of the microspheres, the composite material is directly added into a mine water anaerobic reactor, the sulfate radical removal rate exceeds 92%, and the sulfate radical removal rate exceeds 92%. Heavy metals such as Cu, Pb and Cr in the mine water can be synchronously precipitated, and the treatment efficiency and stability of the anaerobic system are remarkably improved.

The invention discloses a dynamic monitoring, regulating and controlling method and system for sealing and storage of a water depth of a mine, and relates to the technical field of sealing and storage monitoring of mine water. The method comprises the following steps: monitoring network deployment: installing related sensors at key positions to form a three-dimensional monitoring network; acquisition and transmission: acquiring original data of sensors in the three-dimensional monitoring network, and performing data preprocessing; aI model construction and training: collecting historical data to construct a training set, and constructing an LSTM neural network prediction model; dynamic risk assessment: constructing a risk assessment model based on an XGBoost algorithm, and calculating a sequestration layer risk index in real time through the risk assessment model; and intelligent regulation and control: generating a regulation and control strategy according to the output of the LSTM neural network prediction model. According to the method and the system, monitoring of the sealing and storage area of the water depth of the mine can be accurately realized in real time, and early warning of risks can be realized.

The invention discloses a foundation pit underground water monitoring device under complex conditions and a construction method, and relates to the technical field of underground water monitoring. The first telescopic rod is connected with the controller through a data transmission module and is used for receiving a control signal of the controller; one end of the supporting rod is fixedly connected with the telescopic end of the first telescopic rod, and the other end of the supporting rod is a free end; the distance sensor is electrically connected with the free end of the supporting rod, and the distance sensor is connected with the controller through a data transmission module; the monitoring assembly is arranged at the lower end of the first telescopic rod and used for monitoring the water level of underground water; the method has the effect of improving the foundation pit water level monitoring efficiency.

The invention discloses a method for preventing and controlling floor water inrush in the technical field of mine water disaster prevention and control, which comprises the following steps of: 1, analyzing mine conditions: knowing geological conditions of a water-resisting layer and a water-bearing layer, and determining underground water conditions; 2, regional evaluation: probing the water yield property of the aquifer, and dividing the working face into an abnormal region and a dangerous region; 3, drilling is carried out, wherein hole verification area division is carried out, the water quality type is determined, and the water pressure is measured; 4, drainage and pressure reduction, wherein drainage is conducted in the main hole according to the water inrush coefficient, and meanwhile water pressure and water pumping amount fluctuation are monitored in the whole process; 5, observation holes are formed and monitored, specifically, a plurality of observation holes are additionally formed in one side of the main hole, and water level changes are monitored; sixthly, grouting reinforcement is conducted, specifically, grouting reinforcement is conducted at the main hole, and meanwhile the water pumping power is lowered; and 7, reinforcing result verification: evaluating the reinforcing effect. The method is easy to operate, and the ideal bottom plate reinforcing effect is achieved by conducting drainage pressure reduction and grouting reinforcement at the same time and arranging the observation holes.

The invention discloses a karst area foundation pit water inrush early warning system and method, and relates to the technical field of artificial intelligence. Data of groundwater dynamic, geological stress and soil water content of a karst area are monitored in real time through a data acquisition module, and data cleaning, noise filtering and complementing are performed in a data processing module; a multi-dimensional interpolation algorithm is used for compensating data missing, and the data integrity and accuracy are improved; in the region division and analysis module, a karst region is divided into independent karst sub-regions, geological characteristic data is monitored in real time, and the fracture expansion trend and the water level change are analyzed through a model of the chain reaction early warning module, so that the water inrush time and region are predicted, and the dependence of the system on a historical data mode is reduced; and the feedback control module evaluates the associated risk index Tsyz, so that the water inrush risk of adjacent areas is prevented in advance, and the real-time response and construction safety of the system are ensured.

The invention provides a preparation method of a multi-source coal-based solid waste filling material, and belongs to the technical field of solid waste reutilization, and the preparation method comprises the following steps: uniformly mixing cement, fly ash, furnace bottom slag, desulfurized gypsum, coal gangue, gasified slag and a water reducing agent to obtain a mixed material; and adding fluorine-containing mine water into the mixed material, stirring and mixing to obtain the cemented multi-source coal-based solid waste filling material with predetermined fluidity and bleeding rate. The invention further provides application of the multi-source coal-based solid waste filling material. According to the preparation method and application of the multi-source coal-based solid waste filling material, the coal-based solid waste can be comprehensively recycled and is environmentally friendly, and the prepared multi-source coal-based solid waste filling material can effectively control and treat fluorine ions in mine water.

The invention discloses a comprehensive utilization scheduling method based on mine water quality difference. The method comprises the steps that the matching degree of a mine and a mine water utilization source is calculated; calculating weight coefficients of conveying the mine water to the mine water utilization source from different mines, and screening different mine water quantities conveyed to the mine water utilization source from the mines based on an optimal matching principle; a water quality detection system installed at a mine mouth collects water quality data of mine water in real time, predicts the water quality data of the mine water in real time and outputs the predicted water quality data; and updating the mine number and the mine water quantity for conveying the mine water to the mine water utilization source, thereby realizing real-time scheduling and updating of the dynamic change of the mine water quality. According to the scheme, dynamic regulation and control of the scheduling process are realized while the load and cost of water purification during mine water utilization are reduced.

The present invention relates to the technical field of coal mining, in particular to a method for constructing an artificial water guide channel through drainage boreholes in a roof aquifer by means of pulse fracturing. The method involves arranging drainage boreholes and using pulse fracturing to pre-form an artificial water guide channel in a sandstone fracture aquifer through the arranged drainage boreholes, thereby improving the permeability of dense and intact sandstone rock masses; the artificial water guide channel formed by the drainage boreholes in the sandstone fracture aquifer connects discontinuous water-bearing areas and water-rich areas, such that roof sandstone fracture water‌ is guided to the drainage boreholes through the artificial water guide channel, thereby achieving effective drainage of the boreholes and expanding the drainage radiation range of a single borehole. The present invention not only avoids arranging excessive drainage boreholes and remarkably improves the drainage efficiency of exploratory drainage holes, but also achieves an advanced drainage function in a stoping process. By means of the method, mine water disasters can be effectively controlled even under unfordable geological conditions, thereby guaranteeing safe production at mines.

The invention discloses a mine water fluorine removal agent and a preparation method and application thereof, and belongs to the technical field of wastewater treatment.The preparation method of the fluorine removal agent comprises the following steps that aluminum salt, calcium salt, magnesium salt and ferric salt are added into water to be stirred, then a chelating agent, a hydroxy carboxylic acid compound and a dispersing agent are added, the mixture is heated to 40-60 DEG C to be stirred and dispersed, and heat preservation is conducted. The preparation method gets rid of the constraint of traditional calcium salt, introduces the chelating agent, the hydroxy carboxylic acid compound and the dispersing agent on the basis of controlling the compatibility of the materials and the synthesis reaction process, and utilizes the excellent fluorine ion adsorption performance and flocculation settling performance of the aluminum-calcium-magnesium-iron-based quaternary metal material to improve the fluorine ion adsorption performance of the aluminum-calcium-magnesium-iron-based quaternary metal material. Quaternary metals are assembled into a long-chain porous structure through chelation, the specific surface area and the pore volume are further increased, the contact area with fluorine ions in mine water is increased, and the porous structure adsorbs complexing groups to achieve the purposes of rapid coordination, strong adsorption, precise chelation, flocculating settling and efficient removal of fluoride in mine water.

The invention provides a coal gangue filling post-production water reducing method, and relates to the technical field of green mining of coal mines. The method comprises the following steps: determining the position and row pitch of grouting holes according to the position of a coal mine goaf and the diffusion radius of coal gangue slurry; analyzing the overlying strata of the coal mine goaf, and determining the development height of the caving zone; according to the development height of the caving zone, the vertical depth between a grouting end hole and a corresponding grouting hole is calculated, and the grouting end hole is located at the top of the caving zone; drilling is conducted according to the position, the row pitch and the vertical depth of the grouting holes; and coal gangue slurry is injected into the grouting holes to fill the goaf in the coal mine, and the bleeding rate of the coal gangue slurry meets the preset requirement. By means of the mode, coal seam roof cracks can be filled and blocked, a supply channel is blocked, the water inflow of a mine is reduced, and meanwhile part of mine water can be consumed through manufacturing of coal gangue slurry. The coal gangue is subjected to underground treatment, the problem that the coal gangue is stacked on the ground to pollute the environment is solved, and green mining of a coal mine is achieved.

The invention discloses a coal mining water retention method, which comprises the following steps of: pre-calculating the height h0 of a water flowing fissure zone in a deep aquifer when the water yield Q2 of a coal mining mine is equal to the total water consumption Q1 of production and life of a mining area, and then calculating the corresponding mining height M0 when a coal seam below is mined according to the height h0 of the water flowing fissure zone; according to the mining height M0, the filling height M2 needing to be equivalently filled in the goaf is calculated, and materials are filled into the goaf behind along with advancing of the coal face during coal mining until the materials reach the height of M2, so that too high or too low development of the water flowing fissure zone can be inhibited, the filling height or thickness can be reduced, and the filling efficiency is improved. According to the method, the balance between the filling height of the goaf and the development height of the water flowing fractured zone is found in an equivalent filling mode, mine water generated during coal mining can meet the total water consumption of production and life of a mining area, the defects caused by complete filling can be avoided, the coal mining efficiency is improved, and the water retention effect is also improved.

The utility model discloses a solid-liquid separation treatment system for hardness and silicon removal of mine water. The solid-liquid separation treatment system comprises a water inlet tank, a first reaction tank, a second reaction tank, a concentration tank and a tubular membrane filtration device which are sequentially communicated along the treatment direction of the mine water, the first reaction tank is connected with a lime dosing device and a magnesium dosing device, the second reaction tank is connected with an alkali dosing device, aeration devices are arranged at the bottoms of the water inlet tank, the first reaction tank, the second reaction tank and the concentration tank, the aeration devices are connected with an external aeration fan, and mechanical stirrers are arranged in the first reaction tank, the second reaction tank and the concentration tank; a water outlet of the tubular membrane filtration device is connected with a water outlet tank through a water outlet pipe, a pipeline mixer is arranged on the water outlet pipe, and an acid dosing device is connected to the pipeline mixer; and a concentrated water port of the tubular membrane filtering device returns to the concentration tank through a return pipe. The device can simultaneously realize high-efficiency hardness removal, silicon removal and solid-liquid separation of mine water, and has the advantages of good effluent quality, stable operation, small occupied area and the like.

The invention relates to the technical field of building foundation pit waterproof curtains, in particular to a guide hole auxiliary method for a gravel-cobble layer and a three-axis stirring pile construction method, and aims to solve the problem that a constructed three-axis stirring pile curtain is prone to water leakage due to the fact that existing gravel-cobble layer construction cannot reach the design depth of the three-axis stirring pile curtain. According to the method, a mode of repeatedly lifting a drill and reversely lifting the drill is adopted, drilling is carried out for multiple times, three-shaft stirring pile construction hole guiding assistance is carried out in a hole separation punching and hole guiding mode, a channel is created in a gravel-cobble layer in advance, guidance is provided for three-shaft stirring pile construction, meanwhile, the dense gravel-cobble layer in the construction direction is loosened, and the construction efficiency is improved. It is ensured that the three-shaft stirring piles can evenly and deeply penetrate through a gravel-cobble layer, and a continuous anti-seepage wall is formed; the construction method is easy to operate, the extra cost caused by construction blocking, water leakage repairing and the like of the three-shaft stirring pile can be effectively reduced, the construction efficiency is improved, and the construction period and the construction quality are ensured.

The invention provides a coal mine roof sandstone water long directional hole and short straight hole combined drainage prevention and control method, and belongs to the technical field of coal mine water disaster prevention and control. The method comprises the following steps: finely exploring geological and hydrogeological conditions, obtaining hydrogeological characteristics of an aquifer, and calculating static reserves and dynamic replenishment; designing and constructing a long directional hole, and determining a track parameter and a drainage amount; short straight holes are designed and constructed, a low-resistance abnormal area is arranged in a densified mode, and the drainage amount and the drawdown are calculated; constructing a multi-objective optimization model, and determining an optimal drilling position combination; partition drainage control is conducted based on the optimization scheme, the drainage speed and flow are dynamically adjusted, and grouting plugging is conducted on the waterless drill hole; the water inflow is monitored, and the drainage effect is judged according to the attenuation rate. Safe and efficient drainage of roof sandstone water is achieved, the mine water disaster risk is effectively reduced, and safe production of a coal mine is guaranteed.

The invention relates to the technical field of mine water treatment, in particular to a mine water filtering device.According to the mine water filtering device, an ultrafiltration membrane assembly is arranged in a membrane pool to filter mine water, a pressure detector is arranged at a liquid outlet to monitor the water pressure in real time, and the pressure detector transmits real-time data to a controller; the controller is used for judging whether the water pressure entering the clean water tank meets the water production requirement or not, and automatically controlling the starting and stopping of each electrical device according to the judgment result, so that the spraying pump and the moving assembly are started in time when the membrane pollution problem occurs, and the clean water in the clean water tank is pumped to the spray head through the water production pipeline to clean the ultrafiltration membrane assembly; and different positions of the ultrafiltration membrane assembly are cleaned by moving the spray head through the moving assembly, so that pollutants on the surface of the ultrafiltration membrane can be quickly and thoroughly removed, and the water production efficiency is ensured. And moreover, the device does not need to add a coagulant to carry out flocculation and sedimentation treatment on the mine water, so that potential risks of drug residues on subsequent recycled water quality are avoided.

The present invention discloses a heat pipe type air conditioning system for mine, comprising: a heat source collection component, including: a high-temperature electromechanical equipment heat dissipation cover configured with a nanofluid heat pipe connected to a pulsating heat pipe group; a medium-temperature mine water heat exchanger and a low-temperature return air passage heat exchange plate, which are connected to a phase change energy storage tank through the pulsating heat pipe group; a wellhead anti-freezing component, including a heat dissipation fin group connected to the nanofluid heat pipe; an underground temperature control component, including an absorption heat pump, a radiation panel, a dehumidification fresh air unit and a variable-frequency fan, wherein the input end of the absorption heat pump is connected to the nanofluid heat pipe and the phase change energy storage tank, and the output end is connected to the radiation panel, the dehumidification fresh air unit and the heat dissipation fin group, and the input end of the variable-frequency fan is connected to the radiation panel and the dehumidification fresh air unit, and the output end is led into the underground roadway; an intelligent control component includes a controller, which collects the data of each sensor in real time and realizes the control of each component. The present invention realizes the coordination of waste heat recovery and air conditioning, ensures the safety of the mine and reduces energy consumption.

The invention belongs to the technical field of coal mine green mining and disaster prevention and control, and particularly relates to a caving area gangue grouting and filling method for recycling underground coal mine water resources. And zero emission and efficient cyclic utilization of water resources are realized. The coal gangue is used as a main filling aggregate and is directly digested underground, so that the problems of land occupation and environmental pollution caused by ground stockpiling are avoided, and harmless and large-scale treatment of the coal gangue is realized. A water treatment system and a gangue treatment system are combined into a whole, the comprehensive operation cost of a mine in the aspects of water disaster prevention and control, gangue treatment and outsourcing of a water source is remarkably reduced through a cyclic operation mode, and the cost benefit is high. Accurate detection and effect verification of the previous and later ponding areas are carried out through a geophysical prospecting means, and measures such as directional drilling and safety monitoring are combined, so that controllability and safety of the whole operation process are ensured, and the safety and reliability are high.

The invention relates to the technical field of mine water treatment, and discloses a method for treating high-calcium-hardness mine water through induced crystallization. The method comprises the following steps: adding coal gangue and sodium phosphate or sodium hydrogen phosphate into the mine water to carry out first induced crystallization so as to remove calcium ions in the mine water; according to the method provided by the invention, the concentration of calcium ions in the mine water after calcium removal can be stabilized for a long time, and the removal rate of the mine water is improved to a certain extent. The method provided by the invention can effectively ensure that the Ca < 2 + > content of the effluent quality of the mine water reaches the standard, and can also reduce secondary environmental pollution.

The invention relates to a method for preparing a cement admixture resistant to mine water erosion by microwave synergistic chemical modification of fly ash, and belongs to the technical field of industrial solid waste recycling and building materials.According to the method, fly ash particles are mechanically activated and crushed, and a composite modifier treatment and gradient microwave activation technology is combined, so that the cement admixture resistant to mine water erosion is prepared; the activity of the fly ash and the erosion resistance of the cement-based material are obviously improved. The preparation process comprises the following steps: carrying out multi-stage mechanical grinding on the fly ash to obtain ultrafine powder; adding a composite modifier containing a mineral active component, an organic-inorganic composite modifier and a nano functional material for chemical activation; microwave irradiation and nitrogen quenching are adopted to cooperatively process and reconstruct the microstructure of the material; and finally forming through a microwave-steam coupling curing process. The obtained cement admixture can effectively solidify corrosive ions in mine water, improve the durability of traditional cement in a complex ion environment, and realize bulk resource utilization of fly ash solid waste.