102 results about "Activated Coal" patented technology

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 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 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 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 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 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.

This application relates to the field of coal gangue treatment technology, specifically to a method for preparing 45 molecate from solid waste coal gangue, comprising the following steps: crushing and screening the solid waste coal gangue, followed by microwave irradiation; then grinding and drying in a planetary ball mill; adding a composite alkali solution (an aqueous solution of NaOH and Na2CO3) for stirring and activation; adding an interface modifier and composite nanoparticles to the activated coal gangue powder to obtain modified powder; mixing with water, kneading, aging, followed by static pressing and pressure holding to obtain a green body; uniformly spraying an aqueous solution of a mineralizer onto the surface of the green body; pre-drying after spraying; then performing segmented calcination; and finally cooling to room temperature to obtain 45 molecate. By synergistically treating coal gangue through microwave irradiation, composite alkali activation, interface modification, and composite mineralizer, the problems of inertness and poor interfacial compatibility of the silicon-aluminum components in coal gangue are solved, while also achieving the resource utilization of solid waste.

The invention relates to the technical field of concrete, and particularly discloses a modified steel slag mixture and a preparation method and application thereof, the modified steel slag mixture comprises modified steel slag, Portland cement, fly ash, silica fume, activated coal gangue and emulsified asphalt; the modified steel slag is prepared from the following raw materials: steel slag, phosphate modified graphene oxide, a polycarboxylate superplasticizer, water glass and sodium sulfate; the phosphate-modified graphene oxide is prepared from the following raw materials: organophosphate and graphene oxide. According to the invention, the P-GO is anchored on the surface of the steel slag, so that agglomeration of a nano material in a cement matrix is avoided. The anchored P-GO captures Fe < 3 + > dissolved out of the C2F in situ, and drives the C2F to be continuously dissolved; the dissolved Fe < 3 + > and Ca < 2 + > are quickly consumed by the water glass and the sodium sulfate, C-(F)-S-H gel and ettringite are generated, circulation is formed, and the problems of insufficient early strength and poor volume stability of the steel slag are synchronously solved.

This invention relates to the field of zeolite molecular sieve production technology, specifically a method for in-situ crystallization synthesis of zeolite molecular sieves from solid waste coal gangue. The steps are as follows: Coal gangue is calcined at 600-800℃ for 1-5 hours to obtain calcined coal gangue; it is mixed with acid and water at a ratio of 1:(0.1-0.5):(4-8), reacted at 65-95℃ for 1-5 hours, and the pH is adjusted to 7-10 with alkali. After aging, it is filtered, washed, and dried to obtain activated coal gangue; the activated coal gangue is mixed with externally sourced materials, template agent, solid seed crystals (crystallinity ≥85%), and water in a specific ratio, crystallized at 100-200℃ for 24-72 hours, and calcined to obtain SAPO-34, SSZ-13, or AlPO. 4 -5. Adding ammonium salts via ion exchange can produce MTO catalysts. This invention improves the crystallinity of molecular sieves, resulting in a methanol conversion rate of ≥96% for the MTO catalyst, enabling the resource utilization of coal gangue, reducing costs, and providing a versatile process suitable for industrial application.

The application relates to the technical field of fire extinguishing materials, and discloses a mine-used fire preventing and extinguishing material and a preparation method thereof. The mine-used fire preventing and extinguishing material is prepared from the following raw materials in parts by weight: 30-40 parts of sulphoaluminate cement, 20-25 parts of acid-activated coal gangue, 5-10 parts of bentonite-based composite phase change body, 3-5 parts of hollow glass microbeads, 0.5-1 part of polypropylene fiber, 3-4 parts of chitosan-acrylic acid copolymer, 1-2 parts of foaming agent, 2-3 parts of expanded graphite, 1-3 parts of zinc borate, 2-4 parts of nano silicon dioxide and 260-320 parts of water. The mine-used fire preventing and extinguishing material provided by the application improves the performance stability in high-temperature fire preventing and extinguishing and the storage stability in the storage process.

The application discloses a kind of mechanically activated coal gasification slag-based cementitious materials and preparation method thereof, and relates to coal gasification furnace slag solid waste resource utilization.Preparation method includes the following steps: S10, obtaining pretreated coal gasification slag;S20, pretreated coal gasification slag is mixed with fused salt according to mass ratio (4-19) :1, and fused salt blend is obtained;S30, fused salt blend is mechanically ground, and activated coal gasification slag is obtained;S40, activated coal gasification slag, Portland cement and water are respectively taken and stirred and mixed, and precast slurry is obtained;S50, precast slurry is cast into shape and cured, and mechanically activated coal gasification slag-based cementitious material is obtained.The application precisely controls mechanical grinding parameters, and improves the cementitious performance of coal gasification slag in a targeted manner, meeting the diversified needs of cementitious materials in different application scenarios in actual engineering.

The present application belongs to solid waste treatment technical field, provide a kind of coal mine powder slag grouting material and its preparation method and application, by the following raw materials preparation: activated coal mine powder slag 70~80 parts, aluminum ash aqueous solution 30~40 parts, aggregate 17~25 parts, plant fiber 8~12 parts, silica sand 7~10 parts, water reducing agent 2~2.5 parts, mixing water 10~15 parts.Activated coal mine powder slag under alkaline conditions, obtain small unit containing Si-O-Si bond, Si-O-Al bond;Small unit is connected to become aluminosilicate oligomer network to become gel state material;Through alkaline silicon oxide interlocking, promote the degree of polymerization to further improve, network structure is more compact, strength continues to grow, so as to obtain solid filler.The present application not only effectively solves the problem of powder slag accumulation and pollution, but also can avoid the collapse hidden trouble caused by mining, one hit multi, the process requirement of the scheme provided by the present application is low, suitable for mine use.

This invention relates to the field of heavy metal soil remediation technology, specifically to a physical washing method for removing heavy metals from coal gangue and its application in building materials and improved soil. The method includes the following steps: Step S1: Crushing and particle size classification of the raw coal gangue. This invention utilizes a combined physical washing process of "gravity air separation + jigging + hydrocyclone," combined with particle size classification and surface modification technology, to effectively separate and remove heavy metals from the coal gangue at its source. Simultaneously, the separated heavy metal-rich components are subjected to targeted treatment. Surface-activated coal gangue is further used to prepare environmentally friendly non-fired bricks and microbial organic improved soil. The lead leaching toxicity removal rate of the treated coal gangue is improved, allowing it to be directly used for ditch filling and land reclamation without seepage prevention treatment. This achieves source elimination of heavy metals and full-scale resource utilization of solid waste, demonstrating broad application prospects.

The invention belongs to the technical field of tailing ore processing and treatment, and particularly discloses ecological carbon sequestration aggregate based on coal mine slag powder and a preparation method of the ecological carbon sequestration aggregate. The method comprises the following steps: sequentially performing grinding activation and thermal activation (adding an activating agent) on coal mine slag powder to obtain activated coal mine slag powder; then mixing and granulating with a calcium source, an alkali activator, reinforced fibers and a pore-forming agent to obtain a raw material; and sequentially carrying out steam pre-curing, carbonization curing and natural curing on the raw material to obtain the ecological carbon sequestration aggregate. The prepared ecological carbon sequestration aggregate has low preparation cost and good mechanical properties, can consume a large amount of coal mine slag powder, and is beneficial to environmental protection; meanwhile, CO2 can be stored, and permanent solidification of CO2 is achieved.

The application discloses a coal gangue microbial active substrate for planting and a preparation method thereof. The application can dissociate effective mineral elements in coal gangue through the decomposition and activation of microorganisms, and can form a microbial substrate for planting by cooperating with added biogenic solid waste such as biogas residue, coconut husk, poultry manure and vinegar residue. The prepared microbial substrate contains active microbial strains which can continuously decompose and activate coal gangue, and can continuously release mineral elements necessary for plant growth, and can decompose organic matters in biogenic solid waste. Through the added biogenic solid waste, a certain particle size, loose and breathable physical structure and stable physicochemical properties are formed, and the physical structure can stably provide nutrient elements and organic matters for plants in the plant growth period. The microbial active substrate prepared by using the application can slowly provide necessary nutrient substances for plants in the cultivation period, and can better promote plant growth.