149 results about "Activated Coal" patented technology

The invention discloses a method for preparing a soil conditioner based on infrared activation of coal gangue. The method comprises the following steps: S1, preparing activated coal gangue; s2, mixing the activated coal gangue with a slow-release fertilizer and modified zeolite, performing extrusion granulation to obtain basic particles, diluting a long-acting composite microbial inoculum with deionized water to obtain a microbial inoculum suspension, spraying the microbial inoculum suspension on the surfaces of the basic particles in a low-temperature spraying manner, and performing low-temperature drying to obtain a core material; s3, mixing the activated coal gangue with kaolin, humic acid, calcium hydrogen phosphate, sodium alginate and water to obtain coating slurry, and coating the core material with the coating slurry to obtain a shell-core material; s4, mixing the modified activated coal gangue with polyvinyl alcohol, talcum powder, a composite additive and water to obtain outer coating slurry, and coating the outer coating slurry on the core-shell material to obtain the soil conditioner. According to the method, the coal gangue is subjected to infrared activation treatment and then prepared into the soil conditioner with a high additional value, and waste resource utilization is achieved.

The invention discloses a method for preparing high-performance cement mortar based on NaOH activated coal gangue, which comprises the following steps: putting preliminarily crushed coal gangue into a rod mill for crushing and screening to obtain undersize coal gangue and oversize coal gangue; calcining the treated coal gangue, and putting the calcined product into a rod mill for fine grinding to obtain an admixture; weighing the admixture and the cement in proportion, and uniformly stirring and mixing to obtain a cementing material; the preparation method comprises the following steps: pouring a cementing material and gravel into a stirrer according to a mortar ratio, uniformly stirring, dissolving an exciting agent NaOH and a water reducing agent into water, pouring into the stirrer, and uniformly stirring the mixed materials to obtain the final high-performance cement mortar. The coal gangue is calcined and ground by a rod mill to serve as the admixture to replace part of the Portland fly ash cement, and the exciting agent NaOH is added, so that the bending strength and the compressive strength of a test piece added with the exciting agent NaOH are increased, and the admixture is effectively excited and activated by the NaOH.

The purpose of this invention is to provide a method for preparing cemented backfill materials based on response surface methodology using composite activating coal gasification slag. This method belongs to the field of mining engineering technology. Based on sorting and removing impurities from the coal gasification slag and drying it, the invention obtains ultrafine powder of the coal gasification slag for preparing the backfill material through ball milling. Then, coal gangue is crushed and screened using a crusher to obtain coarse, medium, and fine aggregates for the backfill material. Finally, cement, ultrafine coal gasification slag powder, coal gangue aggregate, activator, and water are mixed evenly to prepare the cemented backfill material. This invention not only solves the problem of low activity of coal gasification slag volcanic ash but also effectively controls the shortage of cemented backfill materials and high backfilling costs during cemented backfill mining, ensuring sustainable development. Furthermore, it effectively utilizes the widely accumulated coal gasification slag, reducing pollution and large-scale land occupation of the surrounding environment.

The invention discloses geopolymer cement based on coal gangue activation reaction as well as a preparation method and application thereof, and relates to the technical field of building materials. The invention relates to a coal gangue concrete, which is prepared from the following raw materials in percentage by mass: 50 to 70 percent of activated coal gangue powder, 5 to 15 percent of alkali activator, 10 to 30 percent of auxiliary cementing material and water, wherein the water accounts for 30 to 40 percent of the total mass of the activated coal gangue powder, the alkali activator and the auxiliary cementing material. Through a composite activation process of medium-temperature calcination decarburization and superfine grinding, the activity of silicon-aluminum components in the coal gangue is effectively excited, the reaction efficiency is remarkably improved, the mixing amount of the coal gangue reaches 50%-70%, the resource utilization rate of solid waste is greatly increased, and efficient activation and resource utilization of the coal gangue are achieved. By adopting the methyl sodium silicate and sodium silicate composite activator, the reaction rate and the product structure are regulated and controlled, and the workability and the setting and hardening behaviors of slurry are improved, so that the obtained geopolymer cement has relatively high early and later strength and excellent durability.

The invention relates to the technical field of zeolite molecular sieve production, in particular to a method for synthesizing a zeolite molecular sieve through solid waste coal gangue in-situ crystallization. The method comprises the following steps: roasting coal gangue at 600-800 DEG C for 1-5 hours to obtain roasted coal gangue; mixing the coal gangue with acid and water in a ratio of 1: (0.1-0.5): (4-8), reacting at 65-95 DEG C for 1-5 hours, dropping alkali to adjust the pH value to 7-10, aging, filtering, washing and drying to obtain activated coal gangue; mixing the activated coal gangue with an external source, a template agent, a solid-phase seed crystal (the crystallinity is greater than or equal to 85%) and water in proportion, crystallizing for 24-72 hours at the temperature of 100-200 DEG C, roasting to obtain SAPO-34, SSZ-13 or AlPO4-5, and adding ammonium salt for ion exchange to prepare an MTO catalyst. The crystallization degree of the molecular sieve is improved, the methanol conversion rate of the MTO catalyst is larger than or equal to 96%, coal gangue recycling is achieved, cost is reduced, and the technology is universal and suitable for industrialization.

The invention discloses a solid-waste-based grouting material for mine roof contact filling and a preparation method. The solid-waste-based grouting material comprises 30-44 parts of steel slag powder, 25-39 parts of fly ash, 8-15 parts of desulfurized gypsum, 10-24 parts of activated coal gangue powder and 13-18 parts of an alkali activator. The mass ratio of the alkali activator water glass to the sodium hydroxide is 1.5-2.5; the content of free calcium oxide f-CaO required by the steel slag powder is lt; the specific surface area is greater than or equal to 700m < 2 > / kg; the activated coal gangue powder is prepared by calcining coal gangue at 650-750 DEG C for 1-2 hours, removing organic matters and activated silicon-aluminum components, and grinding until the specific surface area is greater than or equal to 500m / kg. The fluidity of the obtained material is 260-310 mm, the 3d compressive strength is larger than or equal to 7.2 MPa, and the 28d shrinkage rate lt is achieved; the solid waste utilization rate is greater than or equal to 90%, and the cost is reduced by more than 35% compared with that of the traditional material. The material is used for mine filling roof contact, has the characteristics of good fluidity, rapid hardening, appropriate early strength, excellent volume stability, environmental friendliness and low cost, and has wide application prospects.

The invention provides a method for preparing a poly-aluminum and functional silicon material by activating coal gasification slag and waste hydrochloric acid through microwave synergistic mechanical force, and belongs to the technical field of industrial solid waste recycling. The method comprises the following steps that the coal gasification slag is sequentially subjected to microwave radiation treatment and ball milling, activated slag and waste hydrochloric acid are subjected to an acid leaching reaction, and aluminum-iron-containing leachate and silicon-rich slag are obtained; extracting the aluminum-iron-containing leaching solution to obtain an iron-rich organic phase and a purified aluminum chloride solution; performing thermal polymerization reaction on the purified aluminum chloride solution to obtain polyaluminum chloride; the method comprises the following steps: carrying out alkaline leaching reaction on silicon-rich slag and waste alkali liquor, adding a structure-directing agent into a sodium silicate solution, and sequentially carrying out aging, solution pH value adjustment and crystallization precipitation to obtain mesoporous silica. According to the method, the aluminum-silicon leaching rate is remarkably increased through microwave-mechanical force synergistic activation, synergistic and efficient treatment of the three kinds of waste including the coal gasification slag, the waste hydrochloric acid and the waste alkali liquid is achieved, the technological process is closed, the product additional value is high, and the environmental and economic benefits are remarkable.

The invention belongs to the technical field of coal gangue refined comprehensive utilization, and particularly relates to a process for preparing aluminum oxide by coal gangue decarburization activation acid leaching, which comprises the following steps: multi-stage activation, circular salt separation, catalytic alkalization, directional crystallization, oxygen-controlled roasting, magnetic separation impurity removal, flue gas reuse and the like. Efficient extraction of aluminum and deep removal of impurities in the coal gangue are achieved, and the final product aluminum oxide is high in purity, low in impurity content and fine and uniform in granularity and meets the metallurgical-grade aluminum oxide standard. The invention provides an industrial feasible scheme for high-value utilization of the coal gangue.

The invention discloses an integrated method for realizing sand prevention and stabilization and soil improvement based on coal gangue, which comprises the following specific steps: crushing the coal gangue, grading and screening, taking the coal gangue with the particle size of 0.1-10 mm, and adding bacillus thuringiensis and a compound additive into the coal gangue for activating treatment; the activated coal gangue is mixed with sand grains, then the coal gangue with the grain size being 10-100 mm is laid on the desert earth surface, and integrated treatment is completed; under the combined action of the bacillus thuringiensis and the compound additive, degradation of the coal gangue is accelerated to form a fine particle matrix, and organic matters contained in the coal gangue are synchronously degraded to generate humic acid; meanwhile, metabolites of the bacillus thuringiensis and biological enzymes can promote slow release of nutrient elements such as silicon, potassium and phosphorus in the coal gangue, so that the physical and chemical properties of desert sand grains are improved, and the dual purposes of sand prevention and stabilization and soil improvement are finally achieved by combining the surface laying effect of the coal gangue with the large particle size.

The invention discloses a coal activated carbon rotary kiln inner container and a modular structure and an assembly method thereof, and overcomes the defects that an existing rotary kiln inner container is prone to deformation, waste gas is prone to accumulation, and activation is affected. The modular structure comprises a central pipe, a plurality of stirring blades, at least one connecting hoop, a fastener and at least one exhaust hole, the modular structure of the rotary kiln inner container comprises a stirring assembly and a tightening assembly, and a method for assembling the modular structure comprises the steps that the tightening assembly and the stirring assembly are sequentially connected at intervals in the axial direction of the central pipe; according to the invention, the structure is stable, the service life is long, the exhaust is smooth, the reaction is sufficient, the modular design is realized, the implementation is convenient, the connection is reliable, the connection strength between the end part of the stirring blade and the connecting hoop as well as between the root part of the stirring blade and the central pipe is enhanced by the supporting plate and the connecting strip, and the service life of the stirring blade is prolonged. And the whole liner structure is firmer and more durable.

The invention belongs to the technical field of adsorption, and relates to a hydrogel adsorption material based on microbial activated coal gangue loaded with rare earth elements as well as a preparation method and application of the hydrogel adsorption material. The method comprises the following steps: grinding and calcining a coal gangue raw material to obtain calcined coal gangue; mixing the calcined coal gangue with a mixed microbial agent, adjusting the pH value, standing and culturing to obtain microbial activated coal gangue; immersing the microbial activated coal gangue into a rare earth element salt solution, and magnetically stirring to obtain rare earth element loaded modified coal gangue; dissolving sodium methacrylate sulfonate and 2-acrylamido-2-methylpropanesulfonic acid in deionized water, adding a cross-linking agent, an initiator, a rare earth element salt solution and the modified coal gangue, fully reacting until the system is viscous, and freeze-drying to obtain the microbial activated coal gangue loaded rare earth element hydrogel adsorption material. The problems that the potential activity of the coal gangue is not fully utilized, and a traditional hydrogel adsorption material is poor in selectivity, high in cost and the like are solved.

This invention discloses a rotary kiln liner for coal-based activated carbon, its modular structure, and assembly method. It overcomes the shortcomings of existing rotary kiln liners, such as easy deformation and waste gas accumulation affecting activation. The rotary kiln liner is located within the rotary kiln body and includes: a central tube, multiple stirring blades, at least one connecting hoop, fasteners, and at least one exhaust port. This invention provides a modular structure for the rotary kiln liner, including stirring components and fastener components. The method for assembling the modular structure includes sequentially and spacedly connecting the fastener components and stirring components along the axial direction of the central tube. The assembled liner has at least one fastener component with a clamping clamp. This invention features a stable structure, long service life, smooth exhaust, and sufficient reaction. The modular design facilitates implementation and ensures reliable connection. The support plate and connecting strip strengthen the connection between the stirring blade tip and the connecting hoop, as well as between the stirring blade root and the central tube, making the entire liner structure more robust and durable.

The application discloses a preparation method of a silicate cement porous vegetation concrete material, and comprises the following steps: calcining coal-based kaolin to obtain activated coal-based kaolin; adding the activated coal-based kaolin and a water reducing agent into mixing water, and performing ultrasonic dispersion to form an activated coal-based kaolin suspension; weighing silicate cement, concrete recycled aggregates and fertilizer, and uniformly mixing to form dry materials; uniformly mixing the activated coal-based kaolin suspension and the dry materials, and loading into a mold for forming; and performing film covering and curing. The application is free from the low-alkalinity porous vegetation concrete system of a sulphoaluminate cement used in the preparation of a porous vegetation concrete in the prior art, and utilizes the activated coal-based kaolin after calcination and ultrasonic treatment as a main alkali-reducing agent to reduce the alkalinity of the silicate cement according to the condition that coal-based kaolin resources are rich, and the activated coal-based kaolin is matched with the fertilizer and the concrete recycled aggregates to provide a new material with rich raw material sources and low cost for ecological protection of a slope and a bank.

The invention relates to the technical field of coal gangue treatment, in particular to a method for preparing 45 mullite by using solid waste coal gangue, which comprises the following steps: crushing and screening the solid waste coal gangue, then carrying out microwave irradiation, after irradiation, feeding into a planetary ball mill for grinding and drying, adding a composite alkali solution, stirring and activating to obtain 45 mullite; the composite alkali solution is an aqueous solution formed by mixing NaOH and Na2CO3; adding an interface modifier and composite nanoparticles into the activated coal gangue powder to obtain modified powder; adding water, mixing, pugging, aging, carrying out static pressure molding, and maintaining the pressure to obtain a green body; and uniformly spraying an aqueous solution prepared from a mineralizing agent on the surface of the green body, pre-drying after spraying, carrying out segmented calcination, and cooling to room temperature to obtain the 45 mullicarb. The coal gangue is cooperatively treated through microwave irradiation, compound alkali activation, interface modification and a compound mineralizer, so that the problems of inertia of silicon-aluminum components and poor interface compatibility of the coal gangue are solved, and solid waste resource utilization is realized.

The invention provides a fluidized bed granulation method of coal-based quantum carbon dot intercalation adsorption type slow-release urea, and relates to the technical field of slow-release fertilizer preparation, and the fluidized bed granulation method comprises the following steps: S1, taking low-rank coal as a raw material, crushing the low-rank coal, mixing the crushed low-rank coal with a deep eutectic solvent DES, and carrying out a stripping reaction under a microwave-assisted condition to prepare coal-based quantum carbon dots CQDs; s2, urea powder is mixed with the coal-based quantum carbon dots CQDs dispersion liquid prepared in the step S1, and a urea-CQDs premix is obtained; according to the method, the coal-based quantum carbon dots are prepared from the low-rank coal, the cost of the low-rank coal raw material is only 1 / 10 of that of traditional activated carbon, the stripping degree of a carbon skeleton can be directionally regulated and controlled through a microwave-assisted deep eutectic solvent stripping method, the specific surface area of CQDs is increased to 1800-2500m / g, the content of surface hydroxyl and amino functional groups reaches 8-18mmol / g, and the adsorption capacity to urea is increased to 150-200mg / g.

The invention relates to microbial agent activated low-grade coal gangue graded and quality-divided artificial soil, preparation and application. The artificial soil comprises a bottom structure supporting layer, and a nutrition activation layer is laid on the structure supporting layer; the structure supporting layer adopts large-size-fraction low-grade coal gangue; the nutrition activation layer adopts a mixture inoculated with a microbial agent, and compost fermentation is performed after inoculation; the mixture is formed by mixing small-particle-grade low-grade coal gangue and local soil in equal proportion; a raised dust covering layer is arranged on the nutrition activation layer and adopts medium-grade low-grade coal gangue; the coal gangue nutrients are activated through the complex microbial inoculants, the coal gangue is divided according to the particle size, different grades of coal gangue and different treatment modes are adopted for different grades, and on the premise that the soil function is not affected, the cost can be reduced, the coal gangue absorption amount can be increased, and conversion from solid waste to artificial soil can be completed.

This invention discloses a coal liquefaction residue-based warm-mix self-healing dual-function asphalt modifier and its preparation method, belonging to the field of road engineering materials technology. The modifier consists of the following components by mass percentage: plasma-activated coal liquefaction residue micropowder (40-60%), warm-mix functional agent (10-20%), self-healing microcapsules (15-25%), interface reinforcing agent (5-10%), and coupling agent (2-5%). The plasma-activated coal liquefaction residue micropowder has a particle size of 0.15 mm, a specific surface area of ​​300-400 m² / g, and a surface hydroxyl content of 1.2-2.0 mmol / g. Its porous structure is used to adsorb and slowly release the warm-mix functional agent, and also serves as a carrier for the microcapsules. The warm-mix functional agent is a compound of sodium alkylbenzene sulfonate / polyoxyethylene ether and glyceryl stearate / methyl oleate, which are oriented at 120-130℃ to form a lubricating interface layer, reducing the viscosity of the asphalt mortar by more than 30%. The self-healing microcapsules use polyurethane as the shell material and contain asphalt recycler, sulfur, and plasticizer in the core material. They can rupture and release the core material when microcracks propagate.

The utility model discloses an assembly welding tool for a roller tooth holder of a coal mining machine, which is applied to the field of assembly welding equipment and comprises a shell, a suction fan is bolted in the shell, an activated carbon filter screen is placed in the shell, an air suction hole is formed in the top of the shell, an air outlet is formed in one side of the shell, and an air outlet is formed in the other side of the shell. A supporting base is connected to the top of the shell in a bolting mode, a positioning disc is arranged on the top of the supporting base, and a lining ring is installed in a groove in the top of the suction ventilator. The welding precision and efficiency of the tooth holder can be improved, the tooth holder is welded according to the principle that scale marks directly correspond to false teeth on the tooth holder, the welding tool is simple and practical, the complicated process that the axial height, the radial length and the installation angle of each tooth holder need to be measured before welding in the traditional technology is reduced, the auxiliary time is greatly saved, and the welding efficiency is improved. And meanwhile, the dust collecting and purifying functions can be achieved, smoke generated in the matching welding process can be treated, the body health of personnel is guaranteed, the surrounding environment is improved, and practicability is high.

A method for preparing a cementing material by sintering and activating coal gangue is provided. The method includes the following steps: (1) crushing coarse-grained coal gangue to predetermined particle size; (2) fully and evenly mixing the crushed coal gangue, the composite additive and water according to a set proportion, and granulating the obtained mixture; (3) distributing, igniting and exhausting the granulated pellets in the sintering machine to obtain decarburized coal gangue sinter; (4) cooling the decarburized coal gangue sinter in a cooler; (5) crushing and finely grinding the cooled coal gangue sinter to obtain a coal gangue active mixture; and (6) mixing the coal gangue active admixture, the fly ash, the quicklime and the gypsum according to a predetermined ratio, and then carrying out injection moulding, mold removal and curing to obtain the coal gangue-based cementitious material.

The system for preparing the activated carbon from the flue gas and the steam of the coal-fired power plant comprises a boiler, a combustor is arranged on the boiler, a hearth outlet of the boiler is connected with an inlet of a flue, a flue gas connector is arranged on the flue, and a heat exchanger is arranged in the flue; a carbonization device; a solid outlet of the gas-solid separation device is connected with an inlet of the combustor, and a gas outlet of the gas-solid separation device is connected with the inlet of the combustor through a second pipeline; a solid inlet of the activating device is connected with a solid outlet of the carbonizing device; an outlet of the flue gas supply pipeline is connected with an inlet of the dust remover; and at least one of a steam outlet of the heat exchanger and a steam outlet of the steam turbine cylinder is connected with a steam interface of the activation device. Therefore, the system for preparing the activated carbon from the flue gas and the steam of the coal-fired power plant has the advantages of high energy utilization rate and small pollution.

The utility model relates to the technical field of pressure relief devices, and particularly discloses a safety pressure relief device of a high-temperature and high-pressure reactor for coal chemical industry, which comprises a communication mechanism, the communication mechanism comprises a transition bin, an inlet pipe and an outlet pipe, a pressure relief bin is arranged on the upper surface of the transition bin, and an electromagnetic ball valve and a processing mechanism are mounted in the pressure relief bin; the processing mechanism comprises a fixed seat arranged on the upper surface of the pressure relief bin, and a movable seat is mounted in the fixed seat; according to the device, the movable seat with the treatment bin is arranged, so that shunted gas does not directly flow to the outside but enters the treatment bin through the fixed seat and the movable seat, and an activated carbon filter layer and an acid-base filter layer in the treatment bin can perform effective harmless treatment on the gas; and an external flange is arranged on the treatment bin and used for being connected with an external storage bin, so that gas is recycled and waits for unified treatment, harmless treatment can be conducted on the discharged gas while pressure relief is achieved, and pollution to the environment is avoided.

The utility model relates to activated carbon processing technical field discloses a kind of efficient energy-saving vertical coal quality activated carbon calcining furnace of multilayer heat insulation structure, comprising: the support seat of supporting main body, the inner wall of the support seat is fixedly connected with combustion furnace, the top of the combustion furnace is fixedly connected with fixed box, the top of the fixed box is fixedly connected with first motor, the drive end of the first motor is fixedly connected with rotating rod and is penetrated through fixed box, the outer wall of the rotating rod is fixedly connected with connecting plate.The utility model in this paper, rotating rod is driven by first motor, rotating rod drives connecting plate, connecting plate rotates, gear and gear ring cooperate to drive rotating shaft, rotating rod and rotating shaft drive stirring plate to stir, then open air heater to make it suck external air and heat, air will enter from air inlet and then be discharged from air outlet, so that each particle or each layer of raw material can receive heat evenly, which helps to improve the stability of calcination effect and product quality.

The invention provides rare earth tailing activated coal gangue as well as a preparation method and application thereof, and relates to the technical field of coal-based solid waste treatment. The invention provides a preparation method of rare earth tailing activated coal gangue, which comprises the following steps: mixing coal gangue powder and rare earth tailing powder, roasting and activating to obtain the rare earth tailing activated coal gangue; the rare earth tailing powder contains fluoride and chloride; the roasting activation temperature is less than or equal to 850 DEG C, and air is introduced in the roasting activation process. According to the method, fluorides, chlorides and rare earth elements in the rare earth tailings are utilized, activation energy is greatly reduced, energy consumption is reduced, coal gangue is utilized for fixing carbon, a large amount of heat energy is provided through combustion, and an aluminosilicate mineral phase structure with stable gas cracking is generated; stepped extraction is achieved, and no hazardous waste is generated. Moreover, the ore phase of the rare earth tailings and the ore phase of the coal gangue have high similarity, after catalytic activation, the grade of the final product is not affected, and high-grade minerals can be obtained.

The invention discloses a fluidized bed type granular coal gangue calcining process and system coupled with a cement clinker sintering system, and the process comprises the following steps: treating large undisturbed coal gangue to obtain granular coal gangue, and carrying out quantitative analysis on minerals in the granular coal gangue; feeding the granular coal gangue raw material into an activating and calcining fluidized bed, and sequentially activating, calcining and regulating the color; then feeding the coal gangue into a grate cooler of a cement clinker sintering system for cooling to obtain calcined activated coal gangue; wherein an activating and calcining heat source comes from grate cooler high-temperature section hot air, the ratio of the high-temperature section hot air to combustion-supporting air is controlled, and temperature and oxygen concentration adjustment in the activating and calcining stage is achieved; and the color regulation heat source is hot air from an outlet of the C4 preheater. According to the invention, the system for preparing the auxiliary cementing material by calcining the coal gangue is coupled with the original cement clinker sintering system, so that the on-line doping of the auxiliary cementing material in the cement clinker is realized, and meanwhile, the carbon emission is reduced.

The invention relates to the technical field of cracking catalysts, in particular to a high-activity coal gangue cracking catalyst modification process which comprises the following steps: crushing coal gangue, spraying an alkaline pretreatment solution on the surface, and roasting to obtain thermally activated coal gangue powder; soaking the thermally activated coal gangue powder in an acidic treatment solution, heating in a constant-temperature water bath, washing, and drying to obtain acid modified coal gangue powder; soaking the acid-modified coal gangue powder in a metal salt solution, fully dipping through ultrasonic treatment, and drying to obtain high-activity coal gangue powder; and mixing the high-activity coal gangue powder with tricalcium aluminate hexahydrate and water, performing spray drying to generate microspheres, and calcining the microspheres in a kiln to obtain the high-activity coal gangue cracking catalyst. According to the high-activity coal gangue cracking catalyst, through matching and combination of the raw materials and the preparation steps, the catalytic activity of the catalyst can be improved, the internal structure of coal gangue is improved, the mechanical strength is enhanced, and the service life is prolonged.

This invention relates to a method for preparing nutrient soil based on coal gangue-induced gypsum crystallization and its application in saline-alkali land improvement. It belongs to the field of solid waste resource utilization technology and solves the technical problem of the lack of an integrated method for "coal gangue soil treatment, directional conversion of pyrite FeS2, and in-situ preparation of gypsum CaSO4·2H2O". The method includes the following steps: Step 1, crushing the coal gangue and activating the coal gangue powder; Step 2, mixing cow dung, straw, and FeS2 to obtain initial organic material, adjusting the carbon-nitrogen ratio, and performing aerobic fermentation on the initial organic material to obtain organic fermented material with peak sulfur-oxidizing bacteria abundance; Step 3, uniformly mixing the activated coal gangue powder and organic fermented material, and placing it in a fermentation tank for controlled maturation. The coal gangue-based nutrient soil produced by this method has excellent chemical properties, good porosity, and stable and abundant aggregates. Gypsum CaSO4·2H2O can be used as a core component for saline-alkali land improvement.

The invention discloses a Portland cement porous vegetation concrete material preparation method, which comprises: calcining coal series kaolin to obtain activated coal series kaolin; adding the activated coal series kaolinite and a water reducing agent into the mixing water, and performing ultrasonic dispersion to form activated coal series kaolinite suspension; weighing the Portland cement, the concrete recycled aggregate and the fertilizer, and uniformly mixing to form a dry material; uniformly mixing the activated coal series kaolinite suspension and the dry material, and loading the mixture into a template for molding; and laminating and curing. According to the preparation method, a sulphoaluminate cement low-alkalinity porous vegetation concrete system adopted in the conventional preparation of porous vegetation concrete is separated, and according to the condition that coal series kaolin resources are rich, activated coal series kaolin subjected to calcination and ultrasonic treatment is used as a main alkalinity reducing agent to reduce the alkalinity of Portland cement; the fertilizer and the concrete recycled aggregate are matched, so that a new material with rich raw material sources and low cost is provided for ecological protection of side slopes and embankments.

The utility model discloses a coal mining machine for coal mining in a coal mine, which belongs to the technical field of coal mining machines and is characterized in that the coal mining machine comprises a coal mining machine body. Smoke containing particulate matter generated during coal seam crushing is absorbed by the dust hood through the filter box and the suction pipe and then enters the filter box, large-particle impurities such as coal cinder and broken stone are intercepted through the primary filter screen frame in the filter box and prevented from making direct contact with fan blades, fine dust is captured through the dust interception filter bag frame, and the dust removal effect is achieved. And finally, harmful gas and peculiar smell in the waste gas are removed through an activated carbon peculiar smell adsorption and purification frame, a three-stage filtration and purification system is formed, the suction efficiency and the dust collection precision are improved, the draught fan can be effectively protected, exhausted gas can be effectively purified, and the problems that an existing dust collection structure is prone to damage, and the peculiar smell of the waste gas is not treated are solved.

The invention discloses a method for preparing a high-performance grouting material by exciting coal gangue through water glass, which comprises the following steps of: putting the coal gangue into a rod mill for crushing and screening to obtain undersize coal gangue and oversize coal gangue; washing the oversize coal gangue with water to obtain a precipitate, and drying the precipitate; mixing the precipitate with the undersize coal gangue; preheating the mixed coal gangue, and calcining to obtain a calcined product; weighing a calcined product and water glass according to a ratio, and grinding into fine powder through a tube together to serve as an admixture; weighing the admixture, the cement, the water reducing agent and the water in proportion, and uniformly stirring and mixing to obtain a cementing material; the preparation method comprises the following steps: weighing the cementing material and the gravel in proportion, and uniformly stirring and mixing. The coal gangue is subjected to ball-milling separation and screening for a certain period of time, so that the coal gangue is separated due to different hardness, the fragile coal gangue is calcined to induce and excite the volcanic ash activity, the fragile coal gangue is used as an admixture to prepare a cement mortar material with a certain amount of water glass, and the high-performance grouting material is obtained.

The utility model discloses a coal mining area groundwater pollution prevention and control comprehensive device which comprises a sewage treatment assembly, and the sewage treatment assembly comprises a water collecting well, a water outlet pipe, a filter box, a connecting pipe, an adsorption box, a drainage pipe, a water temperature sensor, a pH value sensor, a conductivity sensor, a pin shaft, a well lid, a sealing bin, a controller, a limiting frame and a water inlet pipe. Underground water is collected through the water collecting well, large-particle suspended solids, small-particle impurities and part of organic pollutants and heavy metal ions are sequentially filtered through the coarse filter screen, the fine filter screen and the activated carbon filter layer in the filter box, and then water is deeply purified through a special adsorbent in the adsorption box. Meanwhile, the underground water condition is monitored in real time by means of the water temperature sensor, the pH value sensor, the conductivity sensor and the water level sensor, the controller controls the electric valve and other components to work according to monitoring data, comprehensive and efficient prevention and control over underground water pollution in the coal mining area are achieved, and all the components are reasonable in structure and convenient to maintain and operate.