6531 results about "Mining engineering" patented technology

A coal mining solid filling method comprises following steps: using the stacked solids on the ground as the filling materials for the working surface goaf, directly putting the solid filling materials from the ground to a belt conveyor in the underworkings by a perpendicular feeding well, transporting to the end of a coal face through the underground belt conveyor, reloading the solid filling materials to a solid filling mining conveyor hung under a back tail beam of a self-impacting type filling hydraulic support by a self-moving type filling material reloading machine. In the process of mining work, the coal is mined and the filling materials are filled on the bottom; and the solid filling materials are compacted by means of a compactor of the self-impacting type filling hydraulic support. The method solves the problem of coal compaction under the building and low coal recovery.

The invention relates to a method for controlling caving and lane-guarding. The method is characterized in that in a working surface roadway, drilling, blasting or cracking are carried out on a roof of a coal seam of complete hard strata with large thickness of a hanging arch in a goaf; bursting or cutting off are carried out on a complete hard roof strata with large thickness to facilitate the hanging arch in the goaf to collapse at the back of a force piece; collapsed waste rock fills the goaf, supports superincumbent stratum in a fissure zone and releases high bearing stress passed into the coal body adjacent to the goaf from weight of the large-thickness complete hard strata of the hanging arch in the goaf and the superincumbent stratum in the fissure zone thereof, so that the bearing stress in the coal body adjacent to the goaf is reduced and laneways in the space are protected. The method of the invention fundamentally improves stability of surrounding rock of laneways adjacent to the goaf and increases coal mining rate of ends of thick coal seam caving coal working surface.

The invention discloses a solid-filling coal mining method with two pre-excavating tunnels for advancing. A mining roadway adopts an arrangement mode that the pre-excavating tunnels are taken as air return and inlet roadways and a gob-side entry retaining roadway is taken as a roadway for transporting filling materials and coal; coal extraction and gob backfilling are carried out by a comprehensive mechanical solid-filling coal mining process; and according to the coal mining method, a mining sequence is propelled by making a filling coal mining work surface be back to the direction for transporting the coal to a mountain in a mining area. The pre-excavating tunnels are formed before the extraction of the work surface by tunneling, and the gob-side entry retaining roadway is formed by optimally designed filling bodies beside the roadway along with the implementation of advancing filling coal mining operation along the work surface. The coal mining method is simple in process and technically and completely realizes coal milling without pillars, and the resource extraction rate of the coal is high. The coal mining method can not only solve the technical problems that a draw-back-type down-mining and up-filling work surface cannot ensure a filling effect during a filling milling process of a mine with shortage of resources, but also materialize the comprehensive mechanical solid-filling coal mining of mines with limited geological conditions by virtue of an advancing up-milling and down-filling work surface.

The invention relates to a method for reducing concentrate magnesium oxide content in copper-nickel sulfide ore flotation. The method includes steps of firstly adding complexing agent oxalic acid, citric acid, tartaric acid, quadrol and EDTA (ethylene diamine tetraacetic acid), cleaning active ions of copper and nickel on the surface of magnesium-contained gangue mineral such as serpentine, removing flotation activity of sulfide ore collector such as xanthogenate, and adding composition agent to suppress gangue mineral. Ore pulp is treated by complexing agent, the flotation environment is improved, and floatability difference between copper-nickel sulfide mineral and magnesium-contained gangue mineral is increased. By combined inhibitor, serpentine and talc gangue mineral are suppressed, and magnesium-reducing effect is better; nickel recovery rate is increased to some extent as compared with that of actual production. Meanwhile, content of magnesium oxide in concentrate is reduced, and melting cost is lowered.

The invention relates to a permeability improvement technology for a coal bed gas reservoir cap by using three-dimensional fracture network modification. The technology is as follows: building a bedding horizontal well from ground to top and bottom plates of the coal bed of an area not mined; building bedding, three-dimensional cross-type or multi-branch long boreholes on the top and bottom plates of the coal bed of the area not mined through perforation and segmented fracturing or existing sinking and driving engineering, and then carrying out hydraulic fracturing; modifying the coal bed gas reservoir cap into a crisscross fracture network system to form a modified volume; building various types of drainage boreholes in the modified volume; and carrying out negative pressure extraction together with a fractured well, so that coal bed gas can be continuously desorbed and dispersed and then extracted out in large scale through the modified volume. According to the invention, the crisscross fracture network system is formed in the coal bed gas reservoir cap, so that the coal bed gas can be continuously desorbed and dispersed at negative pressure and then extracted out in large scale through the modified volume, thus the content of coal bed gas in the modified bed can be quickly reduced to be below the safety standard in the outburst prevention formulation, and safe and high-efficiency production of mines can be realized on the basis of forming scale coal bed gas development.

Provided is an opencast coal mine end slope filling mining method. The opencast coal mine end slope filling mining method includes the steps that a coal pillar reserved at an opencast coal mine end slope is divided into a plurality of stalls which are equal to an end slope coal mining machine roller in width; a stowboard is tunnelled to the position of an earth surface safety boundary line in the coal seam trend direction, and a stowboard is tunnelled in the coal seam inclination direction; an end slope coal mining machine is used for mining the stalls on the side of the stowboard in the coal seam inclination direction at intervals, after mining of the stalls is completed, the end slope coal mining machine is removed, mining openings in the sides of stall side slopes are sealed, and filling is performed on the stalls which are mined at intervals; then, mining is performed on stalls at intervals, the stalls are not mined, filling is performed on the mined stalls, and the steps are repeated until mining of all the stalls which are not mined is completed. According to the opencast coal mine end slope filling mining method, rock and soil discharged by an opencast coal mine can be effectively used, the discharge amount of the rock and soil of the opencast coal mine is reduced, the stripping ratio is lowered, mines end slope coal resources are mined in a maximization mode, meanwhile the side slope safety is guaranteed, and the efficient environment-friendly production process of the opencast coal mine is achieved.

The invention relates to a mine roadway advancing and undermining method and main blasting parameters. The mine roadway advancing and undermining method is characterized in that blast holes are arranged in a double-lug cracking undermining mode, the nine undermined blast holes are perpendicular to an upright working face and are arranged along an area which is below the center of the working face and separated from the center of the working face by the distance ranging from 10cm to 30cm, and form a cross, the central blast hole and the four end blast holes are charging holes, and holes among the central blast hole and the four end blast holes are empty holes; and vertical cracking undermined holes are detonated at first to form a cracking seam, and then the double-lug undermined holes are detonated, so that a prismatic slot cavity centered at the cross is formed. The main roadway advancing blasting parameters include the diameter of each blast hole, the pitch between each two blast holes, the depth of each blast hole, the number of the blast holes and specific explosive consumption. The empty holes used as free faces are added among the charging undermined holes arranged by the double-lug cracking undermining method, the millisecond blasting technology is adopted, and the blasting free faces are added, so that a clamping effect of ore rock is relieved, smooth undermining can be realized, and blast hole utilization rate can be increased to a great extent.

The invention relates to a gas drainage method combining surface and underground fracturing and permeability improvement, and the method comprises the following steps: building underground large-diameter directional long boreholes in a coal reservoir or the top and bottom plates thereof under a coal mine by using a drilling machine; then building pressure relief holes in a coal bed having an appropriate distance with the large-diameter directional long boreholes; building vertical wells communicated with an underground large-diameter directional long borehole filed or nearby roadways thereof from the ground to the underground; firmly connecting large ground fracturing equipment, a ground vertical well shaft and the underground large-diameter directional long boreholes by using high pressure pipelines; carrying out fracturing on each underground large-diameter directional long borehole by using the large ground fracturing equipment to form a three-dimensional fracture network; discharging water in the underground large-diameter directional long boreholes and then carrying out continuous pressure extraction on fracturing holes and the pressure relief holes; and quickly extracting out the coal bed gas through negative pressure by using the three-dimensional fracture network. According to the invention, the coal bed gas can be extracted out quickly with high efficiency by using the three-dimensional fracture network and negative pressure, thereby providing a technical guarantee for safe and high-efficiency production of mines; and the method has the advantage of wide application prospect.

The invention discloses a two-step sublevel open-stop and delayed filling mining method. The two-step sublevel open-stop and delayed filling mining method comprises the following steps: (1) dividing a mineral body into mineral blocks along the moving direction, dividing the mineral blocks into studs and mineral chambers, and carrying out stud accurate cutting and mineral chamber accurate cutting; (2) recycling the studs, and carrying out delayed high strength cemented filling; and (3) recycling the mineral chambers, and carrying out delayed waste stone or tailing filling. According to the two-step sublevel open-stop and delayed filling mining method, the advantages of a sublevel open-stop and delayed filling method of a flat base structure and a conventional two-step filling mining method applied to thick mineral bodies are synthesized, so that the problem of productivity, filling and safety in the mining process of pitched and heavy-pitched intermediate-thick mineral bodies are effectively solved.

The invention discloses a technology of enhanced-dispersion partial selective and bulk flotation of lead and zinc sulfide ores under low and high alkalinity. During grading of the lead and zinc sulfide ores, sodium hexametahposphate is taken as a dispersion agent and directly added into a ball mill, the ores are ground till the ores with the size of 0.074mm account for 67%-70%, lime is taken as an adjusting agent, zinc sulfate and sodium sulfite are taken as inhibitors, dithiophosphate BA and diethyldithiocarbamate are taken as collectors, and selective flotation of part of lead minerals with good floatability can be performed under low alkalinity; then xanthate and the diethyldithiocarbamate are taken as collectors, and the flotation of the lead minerals is further performed under high alkalinity; copper sulfate is added in lead flotation tailings for activation, butyl xanthate is further taken as the collector for flotation of zinc blende and part of pyrite, and zinc-sulfur separation flotation is further performed on zinc-sulfur mixed concentrate; and sulfuric acid is added in zinc flotation tailings for activation, and the xanthate is taken as the collector for flotation of the remaining pyrite. By adopting the technology, the lead-silver recovery rate can be improved, the using amount of lime and sulfuric acid can be reduced, the circulating amount of middlings can be reduced, the ore dressing cost can be reduced and the grade of the concentrate can be improved.

The invention relates to a directional hydraulic pressing penetration, permeability increase and outburst elimination method of a guide groove, which comprises the steps of (1) constructing a guide groove drill or the guide groove drill and control drills in a coal seam; (2) forming a guide groove in the guide groove drill in advance; (3) utilizing the guide groove drill or the control drills to perform hydraulic fractures, utilizing the guide groove and the control drills to perform directional control on the hydraulic fractures, enabling the coal body between the guide groove drill or the guide groove drill and the control drills to be pressed into penetration, forming multiple fractures among drills, and enabling a large amount of nickings to be brought out through the high-pressure water; and (4) after the fractures finish, enabling all the drills to be sealed and accessed into a drainage system, and beginning extraction. By means of the method, the number of pressing penetration of drills can be increased by 50%, the pressure relief scope of the coal seam is increased by over one time, the permeability of the coal seam is remarkably improved, gas extraction is increased by more than four times, measure drills can be reduced by about 60%, fore-pumping time is effectively reduced, area outburst elimination is achieved, and gas hazards can be reduced to the largest extent.

The present invention provides an open pit coal mine mining process, which comprises the following operation steps: 1, adopting a bucket wheel excavator to dig a loess layer on the upper portion, placing the dug loess onto a conveying belt of a belt type conveyor, and discharging the loess to an outer dump; 2, adopting a single bucket truck to convey crushed stone in a rock layer on the middle portion to the outer dump, and adopting the single bucket truck to convey into an inner dump until a rock layer on the lower portion is exposed after a pit formed by the rock layer on the middle portion has a enough space; 3, adopting a casting-blasting method to blast the rock layer on the lower portion, adopting a bulldozer to flatten the top surface of the blasting stack to form a combination extension platform, adopting a dragline to inversely stack the blasting amount into the inner dump, directly discharging the blasting amount into the inner dump with matching with the single bucket until a coal layer is exposed; and 4, adopting the single bucket truck to convey coal in the coal layer to a crushing plant, and then conveying the crushed coal to a designated location with a belt conveyor.

In an underground exploitation process of a coal mine, the coal recovery rate needs improving, and a roller bit of a coal mining machine is prevented from cutting roof strata as far as possible so as not to damage equipment or even cause accidents, so an interface of a coal layer and a rock layer needs on-line identification. The invention provides a coal-rock interface identification method, a coal-rock interface identification system and a coal-rock interface identification probe. A specific energy-level high-pressure water jet which can penetrate the coal layer but cannot penetrate the rock layer is jetted to the coal layer above a tunnel, different acting forces of reflected flow reflected by the coal layer or the rock layer on a nozzle are sensed in real time, and a controller judges the distance between the upper end of the roller bit of the coal mining machine and the coal-rock interface to realize automatic heightening control of a rocker arm of the coal mining machine so that the coal exploitation process realizes the goals of high recovery rate, low mechanical abrasion rate, automatic operation and the like. The coal-rock interface identification method, the coal-rock interface identification system and the coal-rock interface identification probe provided by the invention have the advantages of low cost, high adaptability, high reliability, intrinsic safety and the like.

The invention provides a method for pre-pumping coal roadway stripe gas of a single soft protruded coal seam of an unexploited area and relates to the technical field of gas pumping. Through the method, outburst removal of the area with a single soft hypotonic protruded coal seam coal roadway stripe can be achieved. The method for pre-pumping the coal roadway stripe gas of the single soft protruded coal seam of the unexploited area comprises building a concordant layer horizontal well which is 3-6m away from the coal seam from the ground to a top plate and a base plate of the single soft protruded coal seam of the unexploited area, performing segmented fracturing after oriented perforating, enabling top plate and base plate rock terrane where coal seam gas is sealed and stored originally to be transformed into a pumping liberation layer with developed fracture networks, enabling the pumping liberation layer to be communicated with the coal seam in a large-area mode through the fracture networks, performing decompression and aerogenesis by dewatering, determining whether to perform negative pressure pumping according to water production conditions, enabling the coal seam gas to be desorbed and diffused continuously, and pumping the gas massively by pumping a horizontal well opening in the liberation layer. By pumping the gas massively, the outburst prevention index in the coal roadway stripe can be reduced to below the safety standard in the outburst prevention rules, and safe and speedy drivage is achieved.

The invention discloses a method for floating high-sulfur gold-bearing copper ore, which aims at solving the problems that the existing beneficiation method is lower in copper and gold recovery rate under high-alkali condition, and problems that xanthate and black powder are adopted as high-sulfur gold-bearing copper ore collecting agents, the collecting power is stronger, the selectivity is poor, the separation difficulty of copper and sulfur can be aggravated and the consumption of inhibitors is increased. The method comprises the steps of by adopting lime and sodium metabisulfite as an ore pulp pH regulator and a pyrite inhibitor, and the mixture of isopropyl xanthogen propionitrile ester, black powder acid and ethyl dithiocarboxyl propionitrile ester according to certain proportion as a collecting foaming agent, carrying out ore grinding, rough concentration, primary scavenging, secondary scavenging, primary concentration, and secondary concentration on a crude ore, thus realizing the high-efficiency recovery on copper and gold in the high-sulfur gold-bearing copper ore. According to the method, through reasonable combination and addition of medicaments, the selective adsorption of the collecting agent on target mineral-copper pyrite and other copper sulfide minerals and gold minerals can be reinforced, and the copper recovery rate and the gold recovery rate can be improved.

A method for comprehensive utilization of red mud, phosphogypsum and coal gangue comprises the following steps: red mud, phosphogypsum and coal gangue are used as main original burning materials, a correction material is taken as a secondary original burning material, a homogeneous moisture material is prepared through two-stage batching process and is shaped or dried and crushed, and then a clinker product including main ingredients of dicalcium silicate, calcium sulphoaluminate and calcium sulphoferrite is prepared through calcination. The clinker produced by the method can be not only directly sold as a product but also further processed into a cementing material or product for sale by utilizing the prior art. The method provided by the invention is simple in process and low in investment, the production scale can be either big or small, a rapid hardening early strength clinker produced by the method is wide in use and relatively higher in value, not only are lots of clay resources and non-renewable burning coal saved, but also environmental pollution caused by waste pollutants are effectively reduced, secondary disasters is prevented, and high industrial competitiveness and favorable investment economical efficiency are realized.

The invention discloses a system and a method for increasing drainage quantity of coal bed gas of a ground well drainage goaf and belongs to the technical field of coal bed gas drainage. The method includes: constructing a drainage well between adjacent goaf holes, sequentially sending a drainage pipe and a flow injection pipe in, and arranging sealing sections I and II; opening a valve I and a valve III, injecting 30-60 MPa of supercritical CO2 into the flow injection pipe until pressure indicating number declines suddenly; opening a valve II to enable a ground drainage station to drain the coal bed gas, recording initial gas flow, repeating replacement of coal bed gas with CO2 when coal bed gas flow declines 30% of the initial gas flow again, and stopping coal bed gas drainage until the coal bed gas flow declines to 16% of the initial gas flow finally. By the system and the method, concentration of drained coal bed gas is increased effectively, and cost for separation and purification is lowered; supercritical CO2 jet flow is adopted to break coal columns, so that threshold pressure is low, breaking speed is high, no pollution is caused to a coal bed gas reservoir, and rock breaking efficiency can be improved substantially.

The invention provides a three-dimensional multi-coal-seam-mining similar material model experimental system. The three-dimensional multi-coal-seam-mining similar material model experimental system comprises stand columns, a base plate, a lower-coal-seam filling part, an upper-coal-seam filling part, a first template, second templates and other components in a combined mode. The three-dimensional multi-coal-seam-mining similar material model experimental system is characterized in that when an experiment is carried out through the three-dimensional multi-coal-seam-mining similar material model experimental system, as the coal seam simulating components are flexibly arranged, mining of multiple coal seams can be simulated, and different experimental requirements can be met. The three-dimensional multi-coal-seam-mining similar material model experimental system can simulate complex stress distribution of different coal seams and influences of mining of the upper coal seams on the lower coal seams during underground multi-coal-seam mining, mining of the lower coal seams is simulated by lifting the lower-coal-seam filling part, and the coal seams with different thicknesses can be simulated accordingly; as mining of the upper coal seams is simulated in a pulled-out mode, the coal seam advancing rate can be controlled. Compared with the prior art, the three-dimensional multi-coal-seam-mining similar material model experimental system has the advantages that the structure is simple, the experiment is easy and convenient to operate, and the manufacturing cost is low.

The invention relates to a filling mining method for a slant middle-thick ore body. The method includes the following steps: (1) chamber division; (2) chamber stoping; specifically, each chamber is divided into two mining ranges respectively of a hanging side and a heading side, namely, a hanging side mining range stope and a heading side mining range stope, according to the connecting line between the hanging side vertex and the heading side bottom point for stoping; the heading side mining range stope is preferentially stoped, and then the hanging side mining range stope is stoped; in each stage, the stoping is carried out in the chambers one by one from bottom to top along the ore body; the stoping in both the heading side mining range stope and the hanging side mining range stope includes stope arrangement and three processes, namely, mining, stope ore drawing and chamber filling; the chambers are divided into two mining ranges, the hanging side mining range and the heading side mining range, for mining; the heading side mining range is firstly mined, and after the goaf is filled, the hanging side mining range is mined, so that full recovery of collapsed ores in the heading side mining range stope can be ensured, and untimely falling of the surrounding rock on the hanging side due to crush and mixing-in of a large number of barren rocks on the hanging side are avoided; the hanging side mining range stope is stoped after the goaf of the heading side mining range stope is filled in a high-concentration manner, so that stability of the stope surrounding rock body is improved; by partially controlling the ore drawing, ore piles are reserved in the stopes, so that the hanging side surrounding rock can be effectively supported, an extrusion condition is provided for next blasting, and the blasting effect is improved.

The invention relates to a coal mining method, in particular to a coal mining method with direct coal pillar recovery, full-width heading of the coal pillar in a stope and arrangement of a single coal curtain between adjacent working surfaces, which solves the problem of low resource recovery rate in the prior coal mining technology. The coal mining method comprises the following steps: firstly, arranging a gate roadway respectively on the two sides of the large-width coal mining working surface; secondly, arranging the rest ventilation connections and service roadways between the gate roadways on the two sides of the working surface according to the need; thirdly, arranging coal mining equipment along the large-width working surface between the two gate roadways; fourthly, operating a coal cutter to cut coal from one side of the large-width working surface to the to the other side thereof. The involved coal curtains can be all mined once. Accordingly, the coal in the entire large-width working surface can be all cut out; the essence of the coal mining method is to move the coal pillars into the heading range of the working surface and changing non-mineability into direct mining.

The invention discloses an interpretation and evaluation method for a reservoir area engineering geological survey and particularly relates to a hierarchy interpretation method and a comprehensive evaluation method for reservoir area engineering geological survey and evaluation. According to the interpretation and evaluation method, the interpretation of bad geologic bodies of landslide, collapse, debris flow and the like can be achieved, the precision can meet a requirement of feasibility, and the comprehensive evaluation of engineering geological problems of reservoir leakage, reservoir bank stability, reservoir bank collapse, reservoir immersion, the debris flow and the like can be achieved. The steps of the interpretation and evaluation method includes firstly, establishing a geographic information system (GIS) data bank of a reservoir area engineering geology and a three-dimensional true color remote-sensing image visualization system; secondly, establishing remote-sensing interpretation marks of the bad geologic bodies of the landslide, the collapse, the debris flow and the like; thirdly, performing preliminary interpretation with geography interpretation as a priority; fourthly, performing outdoor verification by matching of image interpretation; fifthly, performing detailed comprehensive interpretation with three-dimensional interpretation as a priority; sixthly performing reservoir leakage comprehensive interpretation based on a GIS; seventhly, performing reservoir bank stability comprehensive interpretation based on the GIS; eighthly, performing reservoir bank collapse and reservoir immersion comprehensive interpretation based on the GIS; and ninthly, performing reservoir debris flow comprehensive interpretation based on the GIS.

The present invention provides an open pit coal mine mining process, which comprises the following operation steps: 1, adopting a bucket wheel excavator to dig a loess layer on the upper portion, and adopting a dumping plough to dump the loess on a conveying belt into a dump; 2, adopting a loosening blasting method to blast a rock layer on the upper portion, and then adopting a single bucket truck to convey rocks to the dump until a rock layer on the lower portion is exposed; 3, adopting a casting-blasting method to blast the rock layer on the lower portion, adopting a bulldozer to form a combination extension platform, and adopting match of the single bucket truck and a dragline to directly dump the blasting amount into the dump on the combination extension platform until a coal layer is exposed; and 4, adopting the loosening blasting method to blast the coal layer with a thickness of 30 m in one time, carrying out tracking type mining along a dragline work line direction in two coal mining benches, adopting the single bucket truck to convey the mined coal to a crushing plant, and then conveying the crushed coal to a designated location with a belt conveyor.

The invention provides a head-plate multi-section control mining method for the high inclination-angle coal seam comprehensive top-coal caving. The method is characterized in that two or more sections/working faces are arranged on the same stage of the coal seam, protective or isolating coal pillars are arranged between the sections/working faces; the upper sections/working faces on the same stage is mined firstly when mining the single coal seam; the upper layer of coal is mined firstly when mining the coal seam group; the upper sections/working faces on the same stage of a same coal seam is mined first, and the top-coal is not caved or is caved in control during the mining process; the normal top-coal caving stopping procedure begins mining from the second or lower section/working face; in the course of mining the second or lower section/working face, the protective or isolating pillars on the section/working face of the recovery part can ensure that the gangue slips or rolls into the space formed after the top-coal on the middle or upper areas of the section/working face is caved. The method can improve the top-coal recovering rate of the high inclination-angle coal seam top-coal caving and the output of the working face, and can ensure safe production.

The invention relates to a gob-side entry retaining process for solid-filling, coal-mining and laying a gangue wall. The gangue wall is laid at one side of a filling body in a gob on a filling and coal-mining surface and is laid into a wall body by filling gangues in a coal mine into a woven bag or a plastic woven bag to form a mining roadway on a next working surface. The specific process comprises the following steps of: cutting coals by a coal mining machine-moving a frame-pushing a scraper conveyer at the front part for one step distance-closing down and locking; and carrying out temporary supporting to the two ends-packaging a gangue bag and laying the gangue wall-carrying out prestressed supporting to a metal net, a W-shaped steel belt, a ladder beam, a double-head anchor rod with threads-hanging a wind curtain-filling the gob-entering a next circulation. The invention has the beneficial effects that the gob-side entry retaining process is effectively matched with a working surface coal mining and filling process; the operation and the implementation on the filling and coal-mining working surface are easy, and the gob-side entry retaining process is safe and reliable.

The invention discloses a gob-side entry retaining method for an anchor bolt network gangue bag wall body for coal mining without pillars. The gob-side entry retaining method comprises the following steps of: A, crushing solid wastes obtained by separating tunneling gangue and/or coal gangue until the granularity is small than 0.1m and bagging by adopting plastic woven bags to obtain gangue bags; B, conveying the gangue bags obtained in the step A to the position of a working surface, which is used for building an entry, through an underground conveying system and fixing the gangue bags for building a roadside gangue bag wall body to form a gob-side entry; C, arranging the gangue bag wall body into a plurality of steps with different heights; and D, building the gangue bag wall body to the designed position and height and then mounting anchor bolts and paving a metal net, and simultaneously, paving a vertical protection steel belt, carrying out two-way anchoring or single-side pretightening in a large-pallet lane and keeping a gangue bag filling body in the gangue bag wall body in a three-dimensional stress state to achieve the functions of increasing the side pressure of the gangue bag filling body and improving the strength and the rigidity of the filling body.

The invention discloses a method for estimating the development height of an overlying strata water flowing fractured zone of solid filling and coal mining. The method comprises the following steps: establishing a solid filling and coal mining numerical value model by using finite element analysis software according to the collected engineering geological condition information of a filling and coal mining working surface and the physical and mechanical parameters of coal-rock mass obtained by a rock mechanics experiment; simulating the height of an overlying strata plastic region under the conditions that the mining height M and the fullness ratio are changed, then simulating the height of the overlying strata plastic region under the conditions that the fullness ratio is unchanged and the mining height M is changed, and determining the height of the plastic region to be the development height H of the water flowing fractured zone; on the basis of the simulating result, performing multiple regression to obtain a relational expression of the fullness ratio mining height M and the development height H of the water flowing fractured zone; according to the actual engineering parameters of filling and coal mining, designing the actual mining height Mc of the fullness ratio and calculating the development height Hc of the overlying strata water flowing fractured zone. The method provides a reference for accurate estimation of the development height of the overlying strata water flowing fractured zone of the solid filling and coal mining, and provides a theoretical reference for safety mining of a coal seam under a water-bearing layer.

The invention relates to a biological ceramisite filter material made of vulcanized lead zinc ore flotation tailings. The material is characterized by being prepared from 80-90wt% of vulcanized lead zinc ore flotation tailings, 8-18wt% of clay, 1.5-2.5wt% of pore former and an additional bonder, wherein the pore former is sawdust, bamboo scraps or straws, the bonder is lignin calcium xanthate, sodium carbonate or sodium silicate liquid, and the solid-to-liquid ratio of materials used by the biological ceramisite filter material is (8-12):1. The preparation method comprises the following steps of: weighing based on proportion of main and auxiliary materials; drying; mixing; forming; drying; preheating; roasting; and cooling to prepare a biological ceramisite filter material product made of the vulcanized lead zinc ore flotation tailings. The preparation method is simple and convenient to implement, free from secondary pollution, practical and reliable. The biological ceramisite filter material made of the vulcanized lead zinc ore flotation tailings provided by the invention has the advantages of turning ore waste residue into wealth and greatly lowering the cost of materials, so that the biological ceramisite filter material is a high-quality water treatment agent.

The invention relates to a method of solid filling coal mining and building gangue walls along the goaf, which is to build a gangue wall on the side of the filling body in the goaf of the coal mining face, and pack the coal mine gangue into the gangue wall with woven bags or snakeskin bags. If it is full and built into a wall, the coal mine gangue can be directly filled with the gangue filling the coal mining face. Then, the gangue wall needs to be pre-prepared with single-layer metal mesh, "W"-shaped steel belt, ladder beam and double-ended threaded anchor rod. Tight support. As the working face continues to advance, this method can leave a complete gangue wall for the mining of the next working face. The roadway retaining method is simple and practical, has high support strength and low cost.

The invention discloses a method for evaluating the sealing capacity of an oil and gas field reservoir serving as a CO2 storage body at the middle and later periods of oil and gas field exploitation. According to the method, to overcome the defects of the prior art and solve the problems existing in the prior art, based on deep geological research of the storage body, the difference between the reservoir and an overlying strata is considered, a geology evaluating mark set is established and corresponds to log response characteristics, and then the problems existing in CO2 storage evaluation are solved within the oil field spreading range. The method for evaluating the CO2 geological storage body is based on geology evaluating marks and the log response characteristics and comprises the steps of (1) researching various geology evaluating mark parameters of the reservoir and the overlying strata of the geological storage body, (2) establishing the corresponding relation between the geology evaluating marks and the log response characteristics, (3) analyzing the main difference between the reservoir and the overlying strata on lithology and physical property and the cause of the difference, and (4) establishing the technological standard and method for evaluating the CO2 geological storage body of a certain oil field.

The invention discloses a high-strength aerated concrete block which is prepared from the following components in part by weight according to the conventional manufacturing process of the aerated concrete block: 28 to 32 parts of vanadiumore tailings, 5 to 10 parts of cement, 10 to 15 parts of quick lime, 5 to 10 parts of modified nanopowder, 5 to 10 parts of acetylene sludge, 3 to 5 parts of gypsum, 0.05 to 0.1 part of aluminum powder, 0.002 to 0.008 part of peregal, 0.03 to 0.08 part of calcium bicarbonate, 0.003 to 0.005 part of sodium carbonate, 0.5 to 0.8 part of calcium stearate, 0.3 to 0.5 part of zinc stearate, 0.01 to 0.03 part of sodium silicate, 0.05 to 0.1 part of hydroxypropyl methyl cellulose sodium, and proper amount of water. Through addition of nanopowder mineral powder, the volume weight of the brick is reduced, and meanwhile, the energy consumption is reduced. The high-strength aerated concrete block is good in heat insulation property and sound insulation property which are remarkably improved as compared with those of the conventional high-strength aerated concrete block. Meanwhile, the materials in a formula are optimized, so that the strength and the freezing resistance of the high-strength aerated concrete block are improved obviously.