237 results about "Activated Coal" patented technology

The invention belongs to the technical field of civil engineering materials, and particularly relates to a coal gangue-based solid waste cementing material as well as a preparation method and application thereof. The coal gangue-based solid waste cementing material is prepared from the following raw materials in percentage by mass: 60-80% of activated coal gangue powder, 5-20% of an exciting agent, 5-15% of superfine slag powder, 2-5% of silica fume, 1-3% of gypsum and 1-3% of fan blade short fibers. According to the invention, solid waste resources (coal gangue and superfine slag powder) are recycled, and on the basis of consumption of the solid waste resources, the coal gangue-based solid waste cementing material obtained by using the solid waste resources has good mechanical properties and durability, and can meet the use requirements of highway engineering base layers.

The invention belongs to the technical field of desiliconized fly ash, and particularly relates to a high-alumina-silica-ratio material capable of replacing bauxite as well as a preparation method and application of the high-alumina-silica-ratio material. The preparation method comprises the following steps: S1, crushing coal gangue, and grinding the crushed coal gangue until the particle size is less than 40 meshes to obtain a ground material; s2, mixing the ground material and a catalyst according to a weight ratio of 100: (1-2), roasting, and cooling to obtain activated coal gangue; the catalyst comprises sodium carbonate, calcium oxide and aluminum oxide in a weight ratio of 1: (0.3-0.5): (1.4-1.6); s3, mixing a sodium hydroxide solution, the activated coal gangue and a surfactant, and reacting at 50-90 DEG C for 1-6 hours to obtain desiliconized slurry; and S4, filtering the desiliconized slurry, collecting a solid phase, washing with water, and drying to obtain desiliconized fly ash, namely the high alumina-silica ratio material capable of replacing bauxite. The method is high in desiliconization rate.

The invention relates to the technical field of mine ventilation equipment, and discloses coal mine dust removal ventilation equipment which comprises an air pipe, an air draft assembly used for air draft is arranged at the top of a bottom plate of an inner cavity of the air pipe, a collecting assembly used for dust removal is arranged in the air pipe, and the collecting assembly comprises a lower baffle and an upper baffle. The lower baffle and the upper baffle are fixed to one side of a bottom plate and one side of a top plate of an inner cavity of the air pipe correspondingly, an air cylinder is fixed to the surface of the middle position of the upper baffle, an output shaft of the air cylinder penetrates through the top of the air pipe, a linkage plate is rotationally connected to the top of the output shaft of the air cylinder, and a magnetic sheet set is inlaid in the bottom of the linkage plate. According to the exhaust fan, the activated carbon box set is arranged in the air pipe, when the exhaust assembly conducts exhaust type ventilation, after air enters the air pipe, dehumidification and dust removal are conducted through activated carbon particles in the activated carbon box set, the influence of dust and moisture on an impeller of the exhaust fan is reduced, and then the ventilation efficiency of the exhaust fan is improved.

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 invention relates to the technical field of building construction materials, in particular to low-carbon high-performance concrete and a preparation method thereof. The low-carbon high-performance concrete is prepared from the following preparation raw materials in parts by mass: 150 to 180 parts of Portland cement, 24 to 27 parts of sulphoaluminate cement, 120 to 150 parts of activated coal gangue powder, 60 to 80 parts of fly ash, 600 to 700 parts of gravel, 60 to 65 parts of modified basalt fiber, 20 to 25 parts of limestone powder, 10 to 12 parts of light calcined magnesia, 2 to 3 parts of accelerant, 7 to 10 parts of modified polycarboxylate superplasticizer and 180 to 220 parts of water. According to the low-carbon high-performance concrete disclosed by the invention, excellent mechanical properties and durability are ensured, the environmental protection targets of low cost and low carbon emission are achieved, and a new solution is provided for sustainable development of concrete materials.

The invention belongs to the technical field of carbon materials, and relates to a coal pre-oxidation treatment-based high-layer spacing porous carbon material and a preparation method thereof.A large number of oxygen-containing functional groups are constructed in coal through low-temperature pre-oxidation, and a cross-linked structure is constructed through the oxygen-containing functional groups in the coal low-temperature pyrolysis process; free movement, stacking and growth of aromatic lamellas are inhibited, a graphitization process of a carbon material is hindered, a foundation is laid for improvement of interlayer spacing, carbon is activated and etched by adopting excessive carbonate with relatively weak corrosivity, a large number of graded pore structures are generated, activated carbon with high specific surface area is generated, an oxygen-containing functional group structure generated by coal pre-oxidation is generated, and the carbon material is prepared. And uniform generation of subsequent pore structures is also facilitated. The coal-based carbon material obtained by coupling pre-oxidation with medium-temperature carbonate activation has higher interlayer spacing and specific surface area, and has a hierarchical porous structure.

The invention discloses a preparation method of a low-temperature SCR (Selective Catalytic Reduction) catalyst with coke loaded with transition metal oxide. The preparation method comprises the following steps: preparing superfine coal powder; removing mineral substances from the superfine coal powder to obtain ash-removed coal powder; chemically activating the deashed coal powder into an activated coal base; coking the activated coal base to form a coal coke carrier; and preparing a single Fe oxide catalyst and an Fe-Mn composite oxide catalyst which take the coal coke as a carrier. The catalyst is prepared from the coal, so that the utilization value of the coal can be improved, the conversion of the coal from fuel to raw materials can be accelerated, and the pollution of the coal to the environment is reduced. Meanwhile, compared with a noble metal catalyst and coke, the catalyst with the coke carrier prepared by the method disclosed by the invention is lower in price and wide in source, so that the preparation cost of the catalyst can be reduced, and compared with other matrix materials, the coke carrier prepared by the method disclosed by the invention takes superfine pulverized coal coke as a matrix, so that the cost of the catalyst is reduced. The preparation cost is lower, and the pore structure is richer.

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 belongs to the technical field of carbon materials, and discloses coal-based porous carbon based on trace salt induction activation and a preparation method thereof. The preparation method of the coal-based porous carbon based on trace salt induced activation comprises the following steps: uniformly mixing Zhundong coal and trace salt to obtain a mixed product, heating the mixed product in an inert atmosphere and then keeping the temperature constant to obtain a carbonized product, and cooling the carbonized product to room temperature in an active atmosphere to obtain activated carbon, sequentially carrying out acid pickling and drying treatment on activated carbon to obtain coal-based porous carbon; the catalytic action of positive ions in trace active salt and the induction action of negative ions can be combined, so that the action effect of the trace salt is further improved, the activation rate is increased, the distribution of a pore structure is regulated and controlled, the specific surface area of the coal-based porous carbon is increased, and the pore structure is also improved.

The invention relates to a method for preparing spinnable mesophase pitch and carbon fibers from coal tar fractions, and belongs to the technical field of carbon materials. The method comprises the following steps: distilling and extracting aromatic hydrocarbon fractions in different distillation ranges from coal tar, activating the aromatic hydrocarbon fractions in one or more distillation ranges as raw materials, and carrying out non-catalytic polymerization reaction on one or more activated coal tar fractions and one or more non-activated coal tar fractions at a low temperature, and performing high-temperature polymerization reaction to obtain matrix asphalt, and performing reduced pressure distillation treatment, solvent extraction or inert gas purging to obtain the spinnable mesophase asphalt. The spinnable mesophase pitch has wide-area streamline optical texture distribution, good directional arrangement and orderliness, the mesophase content can reach 100%, the softening point is low, the coking value is high, the ash content is low, and the structure is controllable. The carbon fiber prepared based on the mesophase pitch is short in required oxidation time and has excellent performance.

The invention relates to a multilayer filter medium (10) for use in a filter element, comprising: i) an electrically conductive first conductor layer (12), ii) a counter layer (14), wherein the counter layer (14) comprises: ii.a) an activated carbon layer (16), comprising activated carbon in a mass fraction of 70% or more, based on the mass of the activated carbon layer (16), and iii) a multilayer intermediate layer (18) arranged between the first conductor layer (12) and the counter layer (14), wherein the intermediate layer (18) comprises: iii.a) a particle filter layer (20), comprising a first textile fabric, wherein the first textile fabric consists at least partially of an electret material, iii.b) a protective layer (22) arranged between the activated carbon layer (16) and the particle filter layer (20), comprising a second textile fabric.

The utility model discloses a waste gas treatment purification device for coal chemical industry, which comprises an acid liquor purification seat and an alkali liquor purification seat, the acid liquor purification seat is communicated with the alkali liquor purification seat through a gas guide pipe, and the inner side of the acid liquor purification seat and the inner side of the alkali liquor purification seat are respectively provided with a gas distribution seat. A gas inlet pipe is fixedly connected to the input end of the top side of the gas distribution seat on the inner side of the acid liquid purification seat, and the gas distribution seat is a hollow frame seat; according to the waste gas treatment and purification device for the coal chemical industry, through the arrangement of an acid liquid purification seat and an alkali liquid purification seat, waste gas can be sequentially conveyed into gas distribution seats on the inner sides of the acid liquid purification seat and the alkali liquid purification seat through a gas inlet pipe, the contact area of the waste gas and acid and alkali liquid can be guaranteed through cooperation of a top plate and a gas distribution pipe, and the purification and adsorption effect is guaranteed; meanwhile, due to the arrangement of the two activated carbon adsorption net groups, liquid molecules in gas in contact with acid and alkali liquid can be absorbed, the purification effect is ensured, and the problem that an existing device is difficult to continuously perform acid and alkali liquid purification treatment on waste gas is solved.

The utility model discloses a conveying device for coal gangue backfilling, which comprises a conveying device body and a supporting seat, the bottom of the conveying device body is connected with the supporting seat, the top of the conveying device body is provided with a frame body, the outside of the frame body is provided with a first bearing frame and a second bearing frame, the first bearing frame is internally provided with a first breathable net, and the second bearing frame is internally provided with a second breathable net. A first activated carbon plate is arranged on the top of the first breathable net, and a second breathable net is arranged in the second bearing frame. According to the conveying device for coal gangue backfilling, the frame body, the first bearing frame, the second bearing frame, the first activated carbon plate, the second activated carbon plate and other structures are arranged at the top of the conveying device body, the first bearing frame and the second bearing frame are installed on the outer portion and the side face of the frame body correspondingly, and then the first activated carbon plate and the second activated carbon plate are placed; in this way, the adsorption structure can be installed preliminarily, the activated carbon plate can adsorb dust, and therefore the adsorption effect is good in the using process.

The utility model provides honeycomb activated carbon multi-component cutting equipment which comprises a supporting frame, a control device arranged on one side of the supporting frame and a conveying belt installed on the supporting frame, the supporting frame is further provided with a longitudinal cutting device and a transverse cutting device, and the longitudinal cutting device and the transverse cutting device are both located above the conveying belt. The device is used for cutting honeycomb-shaped coal slime on a conveying belt. Two sensors are arranged on the inner side of the supporting frame. The sensor sends electric signals to the control device, and the control device starts the longitudinal cutting device and the transverse cutting device. The whole large honeycomb coal slime is cut into a plurality of honeycomb coal slime blocks with small sizes through the longitudinal cutting device and the transverse cutting device, and then the honeycomb coal slime blocks can be used daily after being dried, carbonized and cremated subsequently. The longitudinal cutting device and the transverse cutting device achieve automatic cutting of the machine, and compared with manual cutting, the production efficiency is improved, and the labor cost is reduced.

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 weathered coal processing, in particular to a humic acid co-production process for pre-selection optimization of weathered coal. The process comprises a pre-selection device, a reaction device, a solid-liquid separation device, a drying device, a heat supply device and a control system. The weathered coal is accurately graded through the weathered coal multi-stage screening device and the weathered coal winnowing device, impurities are removed through the weathered coal feeder and the sodium hydroxide and other additive filling device, solid-liquid separation is conducted through the centrifugal separator, drying treatment is conducted through the humic acid drying machine, and humic acid and activated carbon are generated through the coal-fired steam boiler. The intelligent control system adjusts operation parameters of all devices through the central processing unit, and the resource utilization rate, the energy efficiency and the product quality are improved.

The invention relates to the technical field of metallurgy, in particular to a high-aluminum coal gangue desiliconization method which comprises the following steps: crushing and grinding high-aluminum coal gangue to obtain pretreated high-aluminum coal gangue; roasting and cooling the pretreated high-aluminum coal gangue to obtain activated coal gangue; mixing a sodium hydroxide solution with the activated coal gangue for reaction to obtain desiliconized slurry; filtering the desiliconized slurry, wherein a liquid phase is a sodium silicate solution; and washing the solid phase with water, and drying to obtain the desiliconized fly ash. The coal gangue selected by the invention is high-aluminum coal gangue, the aluminum content of the raw ore is 35-38%, the aluminum-silicon ratio of the raw ore is 0.8-0.9, the aluminum-silicon ratio after roasting activation reaches 0.85-0.95, and the aluminum-silicon ratio after one-step desiliconization can reach 5-8. Compared with the existing desiliconization technology, the technology not only can greatly improve the aluminum-silicon specific speed, but also can replace bauxite to be used as a raw material for preparing aluminum oxide by a Bayer process, so that the production cost is greatly reduced, and the utilization rate of resources is improved.

The invention relates to the technical field of carbon dioxide trapping, and discloses a device for trapping carbon dioxide generated by heat activation coal gangue, which comprises a rack frame, and a heat exchanger and a trapping mechanism are respectively arranged in the rack frame. According to the device for capturing carbon dioxide generated by heat-activated coal gangue, through the arrangement of the primary absorption assembly and the secondary absorption assembly, carbon dioxide in calcination gas can be captured and treated multiple times, the tank body is filled with organic amine, the organic amine can make contact with injected coal gangue heat-activated calcination gas, and the carbon dioxide in the calcination gas can be captured and treated. The organic amine material in the tank body is circularly guided and pressurized through the circulating driving part, so that the contact effect of the gas and the organic amine material is improved, the carbon dioxide trapping effect is improved, and the problems that the absorption performance is reduced due to the fact that the organic amine is easily oxidized and degraded, and the carbon dioxide trapping effect is reduced are solved. Meanwhile, the viscosity of the solution is increased, and gas transmission is not facilitated.

The utility model provides a box type diesel generator, which comprises a case, a generator and a diesel engine, the generator and the diesel engine are fixed in the case, a radiator is arranged on the right side of the diesel engine, an exhaust hood is arranged on the right side of the radiator, a filter box is arranged at the top of the case, and the filter box is used for filtering air entering the case; the filter box penetrates through the machine box and is fixed to the top of the machine box, the filter box comprises a filter screen, an activated carbon layer and an air inlet, the filter screen is arranged on the top, the air inlet is formed in the bottom, the activated carbon layer is arranged between the filter screen and the air inlet, and it can be guaranteed that dust and other impurities in air are filtered out by arranging the filter box; the air purifier is simple in structure, easy and convenient to use, and convenient to disassemble and maintain.

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 relates to a coal gangue-based soil water retention material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) carrying out hydrothermal treatment on coal gangue to obtain activated coal gangue; (2) carrying out modification treatment on the activated coal gangue in the step (1) by adopting microorganisms to obtain microorganism modified coal gangue; and (3) mixing the microorganism modified coal gangue in the step (2) with fly ash and humic acid for reaction to obtain the coal gangue-based soil water retention material. According to the preparation method provided by the invention, the coal gangue is sequentially subjected to hydrothermal activation, microbial modification and mixing reaction with the fly ash and the humic acid to obtain the coal gangue-based soil water retention material, the method is short in preparation process and low in cost, the product is environment-friendly, and a'micro reservoir and water storage network 'is constructed through activation, modification treatment and functional group modification; the obtained material can remarkably improve the water retention and moisture conservation performance of soil, and ecological utilization of coal gangue is achieved synchronously.

The invention relates to the technical field of building materials, and particularly discloses coal gangue doped cement and a preparation process thereof. The coal gangue doped cement is prepared from the following raw materials in parts by mass: 20-30 parts of activated coal gangue powder, 50-60 parts of cement clinker, 15-20 parts of slag powder, 1.5-2.5 parts of nano calcium carbonate, 0.8-1.5 parts of calcium sulphoaluminate, 3-5 parts of a composite curing agent, 4-9 parts of a composite exciting agent, 3-5 parts of water glass and 0.5-1 part of a water reducing agent, the activated coal gangue powder is prepared through urea pretreatment, segmented calcination and acid salt activation; the composite curing agent comprises silica fume and organic acid; the composite exciting agent comprises gypsum and triethanolamine. The coal gangue doped cement prepared by the invention has relatively excellent compressive strength and breaking strength.

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 relates to the technical field of ceramsite sand treatment, and discloses a composite modification method for improving the density of gangue ceramsite sand. The method comprises the following steps: crushing and grinding coal gangue, soaking and activating; preparing a composite modifier system; mixing the activated coal gangue and a modifier, and curing; preforming by using a granulator and spraying a binder; carrying out gradient calcination and surface modification; and carrying out gradient cooling strengthening and screening classification to obtain a high-density ceramsite sand finished product. The density of the coal gangue ceramsite sand is improved, the internal structure and surface characteristics of the coal gangue ceramsite sand are improved through a systematic composite modification method, the strength of the coal gangue ceramsite sand is remarkably improved while the light characteristic is kept, the water absorption rate is reduced, and the durability is enhanced.

The invention relates to the technical field of catalyst preparation, and particularly discloses a catalyst for efficient coal-based synthesis of dimethyl carbonate and a preparation method thereof.The catalyst comprises, by weight, 85%-88% of a coal-based activated carbon carrier, 7%-8% of copper oxide, 3%-4% of zinc oxide, 1%-2% of aluminum oxide and 1%-2% of rare earth oxide; the coal-based carbon material is used as the carrier, so that the thermal stability and the surface adsorption capacity of the catalyst are remarkably improved; after CeO2 is introduced, the redox cycle efficiency is improved, and the methanol conversion rate and DMC selectivity are enhanced; a pore structure is improved through a coal tar blending carbonization technology, and reactant molecule diffusion and product desorption are facilitated; the catalyst is stable in structure, long in continuous reaction time and good in renewability and industrial adaptability, organic functional groups in coal can be directionally reserved through multiple treatment means, high-density defect sites can be constructed, and the loading performance of the catalyst is enhanced.

The smelting furnace for the monometal raw materials comprises a mounting plate, hydraulic cylinders are rotationally connected to the two sides of the top end of the mounting plate, a furnace body is rotationally connected to the top ends of the two hydraulic cylinders, a vertical plate is fixedly connected to one end of the top end of the mounting plate, and the top of the vertical plate is hinged to the furnace body. Hinged frames are rotatably connected to the two sides of the bottom end of the mounting plate, a bottom plate is rotatably connected to the bottom ends of the two hinged frames, a filter box is fixedly connected to one corner of the top end of the mounting plate, an air pipe fixedly communicates with the top end of the filter box, a fan is fixedly mounted on the front face of the filter box, and a clamping groove is formed in one side in the filter box; according to the smelting furnace for the monometal raw materials, the position of the pouring nozzle can be adjusted according to the height of the inlet of the molten metal receiving container, molten metal can be poured more conveniently, harmful smoke generated in the smelting period of monometal materials can be purified, and the health of operators is prevented from being affected.