4333 results about "Calcination" patented technology

An integrated carbon honeycomb structure material and its preparation method are disclosed, belonging to the field of carbon materials technology. Based on a co-sacrificial template low-temperature pyrolysis strategy, the target material can be obtained through three main steps: preparation of a metal salt-colloidal microsphere template precursor, precursor pressing and molding, and subsequent calcination and carbonization. This technology has the characteristics and advantages of simple preparation process, regular and controllable macroscopic structure of the sample (such as shape, area, and thickness), rich and tunable chemical composition, and three-dimensional interconnection of graphene carbon matrix. It has great application potential in many fields such as electrochemical energy storage, catalysis, gas separation, adsorption, and electromagnetic shielding.

The present invention discloses a sulfurized nano zero-valent iron material, its preparation method and application, including: a core-shell structure sulfurized nano zero-valent iron material and a preparation method, the inner core of the sulfurized nano zero-valent iron is zero-valent iron, and the outer shell is Fe9S 10 , calculated by the mass of the sulfurized nano zero-valent iron, the mass percentage of zero-valent iron is 70-80%, and the mass percentage of the iron sulfide is 20-30%; the preparation method includes: placing iron powder in an H2S gas atmosphere for calcination, after the calcination is completed, cooling to room temperature to obtain the sulfurized nano zero-valent iron material. This material can be used for in-situ remediation of chlorinated hydrocarbon organic pollutants in groundwater. Compared with the prior art, the prepared sulfurized nano zero-valent iron is less likely to be oxidized and can overcome the problem of rapid passivation of nano zero-valent iron during the remediation process.

According to the invention, biomass rice hull ash and a sodium hydroxide solution are reacted to obtain water glass and carbon mud. And reacting the water glass with CO2 generated by calcining the limestone to produce a white carbon black product and a mixed waste liquid of sodium carbonate and sodium bicarbonate. Meanwhile, quick lime obtained by calcining limestone is digested and then reacts with sodium carbonate and sodium bicarbonate mixed waste liquid to generate a light calcium carbonate product and dilute sodium hydroxide waste liquid. And finally, the dilute sodium hydroxide waste liquid is concentrated and reused for water glass production, so that the waste liquid is recycled, and a complete process closed loop is formed. According to the process method disclosed by the invention, two leading-edge innovative processes, namely production of white carbon black by renewable resource biomass rice hull ash and production of white carbon black by a carbonization method, are organically combined and are coupled with production of light calcium carbonate by a limestone calcination process, so that the problem that a large amount of sodium sulfate-containing wastewater is discharged in a traditional process is solved; meanwhile, the carbon footprint of white carbon black and calcium carbonate products is greatly reduced.

The invention discloses a high-content steel slag-based functionalized nano-composite cementing material and a preparation method thereof, and belongs to the technical field of solid waste resource comprehensive utilization. The nano composite cementing material is prepared from the following raw materials in parts by mass: 50 to 65 parts of steel slag, 10 to 20 parts of fly ash, 10 to 25 parts of carbide slag, 8 to 15 parts of desulfurized gypsum, 0.3 to 1.0 part of nano silicon dioxide and 0.003 to 0.03 part of silane coupling agent. On the basis of a solid waste synergism theory and an internal alkali excitation effect, quaternary solid wastes such as steel slag and fly ash are optimized and compounded by adopting methods of mechanical-thermal activation, addition of modified nano silicon dioxide, synergistic gelling between solid wastes and the like; the paint is prepared through gradient grinding and a medium-temperature wet curing process. The preparation method is simple, high-temperature calcination is not needed, cement clinker and exogenous excitant do not need to be added, the obtained cementing material can replace part of cement to be applied to the fields of road bases, mine filling, low-carbon building material products and the like, resource utilization and high-value utilization of regional bulk industrial solid waste can be achieved, and carbon emission and production cost are effectively reduced.

The invention discloses a preparation method of an In2O3-Cu-Cu2O ternary heterojunction catalyst and a preparation method of the In2O3-Cu-Cu2O ternary heterojunction catalyst. The method comprises the following steps: at room temperature and normal pressure, firstly, dissolving indium chloride tetrahydrate in a mixed solvent of ethylenediamine-ethylene glycol (the volume ratio is 1: 20-1: 30) and dihydric alcohol amine to obtain a homogeneous solution; then transferring the solution to a hydrothermal kettle, adding deionized water and Cu2O powder with different volumes, and carrying out hydrothermal crystallization at 160-200 DEG C for 10-14 hours; and centrifuging the obtained precipitate, alternately washing with water and alcohol for 2-3 times, carrying out vacuum drying at 60 DEG C for 5-7 hours, heating to 600 + / -10 DEG C at a speed of 3-5 DEG C / min in an N2 atmosphere, calcining for 3 hours, and cooling along with a furnace to obtain a target product. By adjusting the adding amount of the deionized water, the mass proportion of the three phases of In2O3, Cu and Cu2O can be continuously adjusted and controlled, and controllable preparation from'rich copper 'to'rich cuprous oxide' and'stable ternary 'is achieved.

The invention discloses an A-site high-entropy solid oxide fuel cell cathode material as well as a preparation method and application thereof, and provides an A-site high-entropy solid oxide fuel cell cathode material Pr < 0.2 > M < 0.2 > La < 0.2 > Ba < 0.2 > Sr < 0.2 > Co < 0.8 > Fe < 0.2 > O < 3-delta > with a perovskite phase. The preparation method comprises the following steps: S1, weighing multi-element metal nitrates, and mixing to obtain a first mixed solution; s2, dissolving ethylenediamine tetraacetic acid in ammonia water to obtain a second mixed solution; mixing the first mixed solution, the second mixed solution and citric acid to form a mixed precursor solution; s3, carrying out second heating treatment on the mixed precursor solution, and adjusting the pH value to form a gel precursor; and S4, carrying out pre-sintering treatment, third heat treatment and calcination treatment on the gel precursor to obtain a high-grade powder precursor, and carrying out ball milling and sieving treatment to obtain the A-site high-entropy solid oxide fuel cell cathode material. The cathode material is high in stability and good in chemical compatibility with a barrier layer GDC, provides high-quality mass transfer channels and active sites for O2 / O- / O2-, and has good electrochemical performance at medium and low temperatures.

The invention discloses a method for synthesizing GaOOH and beta-Ga2O3 materials with relatively good crystal quality and relatively uniform phase by taking gallium nitrate as a gallium source through a hydrothermal method and high-temperature calcination treatment, and characterizing the GaOOH and beta-Ga2O3 materials. The hydrothermal method adopted by the method has the advantages of simplicity in operation, low cost and the like, and has great advantages in the aspect of synthesizing gallium oxide. And compared with the traditional methods such as CVD (Chemical Vapor Deposition) and the like, which need to introduce noble metal elements as catalysts, easily cause reduction of material crystal quality and introduce unnecessary impurity elements, the method disclosed by the invention can be used for synthesizing the gallium oxide material with relatively good crystal quality and relatively uniform phase by combining a hydrothermal method and high-temperature calcination treatment. GaOOH powder is synthesized by adding an anionic surfactant sodium dodecyl benzene sulfonate (SDBS) solution with different concentrations, and then the GaOOH powder is calcined at the high temperature of 900 DEG C to obtain beta-Ga2O3 materials with different sizes.

The invention discloses a method for preparing a platinum-based alloy catalyst by using a plasma enhanced chemical vapor deposition low-temperature technology, relates to a preparation method of a platinum-based alloy catalyst, and aims to solve the technical problems that a carbon layer is not uniformly coated and metal particles of the catalyst are easy to agglomerate in a high-temperature calcination process in the existing platinum-based alloy catalyst prepared by carbon coating. The method comprises the following steps: 1, preparing Pt / C by a polyhydric alcohol reduction method; 2, pre-treating a Pt / C catalyst; 3, preparing M-Pt / C by a dipping evaporation method; 4, PECVD carbon shell coating is carried out; (5) alloying; and 6, removing a part of carbon shell to obtain the platinum-based alloy catalyst. When the Pt / C catalyst is used for preparing a membrane electrode of a proton exchange membrane fuel cell, the peak power density can reach 1.72-1.89 W / cm < 2 > under a hydrogen-air condition, which is improved by 20.3% and 32.2% compared with a membrane electrode of a commercial 20% Pt / C catalyst, and the Pt / C catalyst can be used in the field of proton exchange membrane fuel cells.

The invention relates to the technical field of crushers, and discloses a crusher for bulk materials after sodium sulfide calcination and a crushing process thereof.The crusher mainly comprises a dust removal mechanism, the dust removal mechanism is fixedly arranged on the right side of the bottom end of a working shell and used for cleaning dust in the working shell, and the dust removal mechanism comprises a dust storage box; a moving assembly is arranged in the dust storage box and used for cleaning the first filter screen and the second filter screen. When the moving assembly works, the moving piston drives the moving shaft to work, so that the moving part moves in the dust storage box, the second filter screen is effectively rubbed, the first filter screen is impacted, dust on the first filter screen and the second filter screen is fully cleaned, and the dust removal mechanism is effectively and timely self-cleaned; and resistance increase and suction reduction caused by dust accumulation are prevented, so that the dust removal efficiency is improved, the working shell does not need to be shut down to treat dust, and the working efficiency is improved.

The invention discloses a method for preparing a catalyst by using red mud and titanium dioxide acidolysis waste residues as well as a product and application thereof. The method comprises the following steps: calcining red mud, adding titanium dioxide acidolysis waste residues and an auxiliary agent, uniformly stirring, adding a desulfurization waste liquid, uniformly stirring, carrying out a hydrothermal reaction, carrying out solid-liquid separation, and calcining to obtain the catalyst material. The preparation process is simple, and efficient resource utilization of the red mud and the titanium dioxide acidolysis waste residues can be achieved. The catalyst prepared through a hydrothermal reaction and a secondary calcination process realizes efficient removal of COD, ammonia nitrogen, total phosphorus and heavy metal pollutants in waste liquid through a photocatalytic function.

The invention discloses spherical silicon dioxide, a high-frequency high-speed copper-clad plate and a preparation method of the spherical silicon dioxide. The dielectric constant Dk of the spherical silicon dioxide is 3.5 F / m-4. 0F / m, the dielectric loss Df is 0.0001-0.005, the amorphous state proportion is larger than or equal to 99%, the spheroidization rate is larger than or equal to 99%, and the porosity is 0.1%-2%. During preparation, the hydrolysis degree is controlled till partial polycondensation is achieved, then under the oxygen introduction condition, pre-oxidation is conducted at the low temperature to remove alkyl, gradient calcination is conducted at the high temperature, local crystallization influence and defect influence caused by powder spontaneous combustion are prevented, meanwhile, viscous bodies in the microspheres are accurately controlled to flow to fill nanoscale pores, and the particle size is reduced. The spherical silicon dioxide with high purity, high spheroidization rate and low dielectric loss is obtained, the dielectric property of the high-frequency and high-speed copper-clad plate can be met, and the high thermal stability and high reliability of the high-frequency and high-speed copper-clad plate are improved.

The invention provides a cyclic utilization method of chelated landfill waste fly ash, and belongs to the technical field of household waste fly ash utilization. The cyclic utilization method of the chelated landfill fly ash comprises the following steps: S1, collecting the chelated landfill fly ash, crushing the chelated landfill fly ash to a certain particle size, and adding an acid solvent for dechlorination and decalcification treatment; washing the pretreated fly ash with water, and drying until the water content is 5-20%; s2, an additive is added into the dehydrated pretreated fly ash, the additive comprises a binder, a combustible matter and a combustion improver, and the mixture is pressed into balls after being evenly mixed; through the synergistic effect of acid pickling and high-temperature calcination, the degradation rate of dioxin in the fly ash reaches up to 99.89%, meanwhile, the leaching concentration of heavy metal is reduced to be lower than the standard limit value of hazardous waste, the problems of land occupation and secondary pollution of a traditional landfill method are solved, and long-term harm of hazardous waste to the environment is reduced through recycling of the fly ash; and the solid waste treatment principle of reduction, harmlessness and recycling is met.

The invention discloses a porous ceramic filter for liquid magnesium alloy purification and a preparation method thereof, and the porous ceramic filter comprises the following raw materials in percentage by mass: 70-85wt% of ceramic particles, 8-15wt% of multi-element oxide system microcrystalline glass brazing filler metal and the balance of a binder, al2O3-B2O3-SiO2-MgO-CaO multi-element oxide system microcrystalline glass brazing filler metal is adopted, under the condition of air atmosphere high-temperature calcination, a compact reaction layer containing a low-melting-point glass phase, an aluminum oxide phase, a magnesium aluminate spinel phase, a calcium aluminosilicate phase, a borate phase and a silicate phase is generated on the surfaces of ceramic particles of a porous ceramic filter through a chemical reaction; the magnesium alloy filter has high strength and good high-temperature stability, and the problems that the filter loses efficacy and magnesium alloy melt is polluted due to the fact that the filter is eroded by magnesium alloy liquid are effectively solved.

This invention discloses a method for preparing a CuZnAlGa-based layered double hydroxide (TLH)-derived catalyst for methanol production from carbon dioxide-rich syngas. Using Cu, Zn, Al, and Ga metal salts as precursors, Na₂CO₃ and NaOH as precipitants, and a mixed alcohol-water solution as an auxiliary solvent, co-precipitation is performed under controlled temperature and pH to obtain a LDH-like catalyst precursor. After high-temperature calcination and in-situ reduction in a hydrogen atmosphere, a layered framework structure of Cu nanoparticles immobilized by oxides is obtained. The LDH-like structure provides lattice confinement, preventing Cu particle aggregation, and the interaction between Cu and the oxides enhances the catalyst surface's adsorption capacity for CO and CO₂, thereby improving the activity and stability of methanol production from carbon dioxide-rich syngas.

The invention relates to a fly ash-based MOFs adsorption-catalysis material integrated preparation method, and belongs to the field of solid waste treatment and resource utilization. The material takes industrial solid waste fly ash as a matrix, and is prepared by the following steps: firstly, carrying out alkali modification and silane coupling agent surface activation treatment on fly ash to form a high-activity matrix; then loading a metal organic framework (MOFs) on the surface of the activated fly ash through an in-situ synthesis process to form a porous composite carrier; the integrated material with CO2 adsorption and catalytic conversion functions is further prepared through impregnation of a copper-based active component and a high-temperature calcination process. According to the invention, the problems of high energy consumption, high cost and low comprehensive utilization rate of fly ash of the traditional CO2 capture and utilization technology (ICCU) are solved, high-valued resource utilization of industrial solid waste and efficient capture and conversion of CO2 are synchronously realized, and the method has dual values of environmental protection and economy.

The invention discloses a carbon / nano zero-valent iron composite material based on coal gasification slag and a preparation method of the carbon / nano zero-valent iron composite material. The method comprises the following steps: performing component separation on the coal gasification slag to obtain an iron-rich residual carbon component, mixing and grinding the iron-rich residual carbon component and sodium hydroxide according to a specific mass ratio, performing high-temperature calcination treatment in a nitrogen protective atmosphere, and performing hydrothermal activation reaction, solid-liquid separation, washing and drying to obtain the carbon / nano zero-valent iron composite material. The material shows excellent hexavalent chromium removal performance, can realize efficient removal of Cr (VI) in water within 5 minutes (the removal rate reaches 78.9%), and has remarkable structural stability. Synergistic activation of the endogenous iron-carbon components in the industrial solid waste is creatively achieved, a green and environment-friendly novel functional material solution is provided for heavy metal pollution treatment, and the method has important environmental benefits and industrial application value.

The invention provides a biochar composite porous material for heavy metal contaminated soil remediation and a preparation method and application of the biochar composite porous material. The preparation method comprises the steps that biomass raw materials are subjected to high-temperature pyrolysis carbonization and then smashed, ground and sieved, and biochar powder is obtained; dispersing in a phosphoric acid solution to obtain a biochar solution, and filtering, washing and drying after a hydrothermal activation reaction to obtain activated biochar; dispersing in a chitosan solution, carrying out ultrasonic oscillation, filtering, washing and drying to obtain modified charcoal; mixing sodium bentonite, attapulgite and deionized water, uniformly mixing the modified charcoal, the functional slurry and a sodium carboxymethyl cellulose solution to obtain composite slurry, performing compression molding to obtain a green body, and then drying and calcining the green body. The biochar composite porous material prepared by the invention can simultaneously play multiple roles of physical adsorption, chemical chelation, ion exchange and the like in a heavy metal contaminated soil treatment process, so that efficient fixation of various heavy metal ions is realized.

The invention belongs to the technical field of petroleum processing, and particularly relates to a catalyst and a preparation method and application thereof. The raw materials of the catalyst comprise a metal active component, a carrier and an auxiliary agent, the metal active component is sulfides of Mo and Ni elements, the carrier is spherical gamma-Al2O3 of 0.5-1 mm, and the auxiliary agent is P; the carrier is modified by using the metal active component and the auxiliary agent to serve as the catalyst. The high-activity catalyst is synthesized by adopting the strategy of changing the roasting temperature, adding the additive for doping modification and changing the molar ratio of metal active components, the additive is combined with surface aluminum atoms, the framework strength is enhanced, pore channel collapse caused by acid / water erosion is reduced, the water resistance and acid resistance of the catalyst are improved, and the catalytic reaction activity is further improved. The catalyst disclosed by the invention is accurate and controllable in structure, can be synthesized in batches, and can be applied to the co-catalytic hydrogenation process of biomass pyrolytic oil and / or a model compound thereof and petroleum distillate oil and / or VR.

The invention belongs to the technical field of solid waste concrete, and discloses fireproof sound-insulation heat-preservation light-weight high-strength all-solid waste concrete and a preparation method thereof.The fireproof sound-insulation heat-preservation light-weight high-strength all-solid waste concrete is prepared from an all-solid waste fireproof cementing material, all-solid waste light aggregate, water and a functional additive; the all-solid-waste fireproof cementing material comprises an alkaline activator component and an active powder component, the alkaline activator component comprises red mud and carbide slag in a mass ratio of (1.5-2.5): 1, and the active powder component comprises granulated blast furnace slag and low-temperature activated calcined coal gangue powder in a mass ratio of (1.0-1.8): 1; the all-solid-waste lightweight aggregate comprises coarse aggregate and fine aggregate in a mass ratio of (1-1.5): 1, wherein both the coarse aggregate and the fine aggregate comprise high-temperature expanded and roasted coal gangue lightweight aggregate; wherein the low-temperature activated and calcined coal gangue powder is obtained by performing gradient temperature control calcination on coal gangue at 650-800 DEG C and then grinding the coal gangue until the specific surface area is greater than or equal to 500m < 2 > / kg; the high-temperature expanded and roasted coal gangue lightweight aggregate is obtained by roasting and expanding coal gangue at 1100-1300 DEG C and then screening and grading.

The invention discloses a method for preparing silicon carbide materials by using coal gasification slag, belonging to the field of solid waste recycling. The solution of the invention includes first pre-treating the coal gasification slag, then performing acid leaching, water washing, suction filtration and drying on the pre-treated coal gasification slag, and then performing Joule heating treatment. After calcination, silicon carbide is obtained; in the Joule heating treatment, the discharge voltage is set to 120V-150V, and the number of discharges is 1-5 times. By performing Joule heating treatment on the coal gasification slag, the reaction time of each Joule heating reaction is extremely short, greatly reducing the energy consumption, and sharply shortening the reaction time, solving the technical problem of high energy consumption caused by the long reaction time in the traditional carbothermal reduction for preparing silicon carbide materials in the prior art.

According to the low-expansion ceramic fiber board and the preparation method thereof, high-purity aluminum silicate fibers and refined cordierite powder are compounded, and the nanoscale permeation effect of ammonia type silica sol is combined, so that the fibers and the powder form a three-dimensional network bonding structure, and the thermal expansion coefficient is reduced; the wettability of the combination of the fibers and the powder is remarkably improved by a pre-dispersion process of the cationic starch, and the block mass rate is reduced; the vacuum-assisted compression molding and the gradient calcining process are synergistic, so that the density uniformity of the product is improved, and high-temperature cracking is avoided.

The invention discloses a ceramic rock plate with a decorative effect and a production process thereof, and belongs to the technical field of ceramics. The rock plate is composed of a green body layer, a ground glaze layer, a cover glaze layer and an ink jet pattern layer, and after firing, a micro-nano rough and low-surface-energy synergistic protection layer is formed through oxygen-nitrogen plasma activation, a hydrothermal reaction of aluminum salt and an ammonia source compound, high-temperature calcination and silane derivative dipping and curing. The green body takes wollastonite, quartz sand and the like as raw materials, and the ground glaze and the cover glaze adopt a feldspar-quartz-nepheline system; after firing, performing plasma treatment and hydrothermal treatment to generate needle-shaped aluminum oxide, and introducing a silane derivative to realize double functions of super-hydrophobicity and wear resistance. Compared with the prior art, the anti-fouling and wear-resistant coating reaches the national standard 5 level, the process is simple, and the coating can be directly connected to an existing production line and is suitable for high-end wall floor decoration.

The utility model relates to the technical field of limestone calcination, in particular to a limestone calcination device which comprises a rotary kiln and a preheater, a coarse material bin, a first preheating area, a second preheating area and a discharging chute are distributed in the preheater from top to bottom, and a coarse material inlet is formed in the top of the coarse material bin. The coarse material bin is communicated with the first preheating area through a plurality of blanking pipes, a preheating table used for receiving blanking materials is arranged in the second preheating area, the preheater is provided with a material pushing mechanism used for pushing the materials on the preheating table into the discharging chute, and a fine material inlet is formed in the side wall of the preheater in the second preheating area. And the fine material inlet is externally connected with a fine material feeding mechanism. By using the device, the preheating effect of coarse material particles and fine material particles is improved, the coarse material particles and the fine material particles can be decomposed more completely after entering the rotary kiln, the quality of calcium oxide is improved, in the whole production process, the energy loss is reduced, the utilization rate of raw materials and resources and the overall production efficiency are improved, and the production cost is greatly saved.

The invention provides a method and system for utilizing flue gas generated after petroleum coke calcination, and belongs to the field of aluminum electrolysis and aluminum carbon. The method comprises the following steps: collecting high-temperature flue gas discharged after calcining petroleum coke; the high-temperature flue gas is subjected to heat exchange treatment, and low-temperature flue gas with the set temperature is obtained; low-temperature flue gas is used as a heat source, the wet-based petroleum coke is heated and dried, and dry-based petroleum coke with a set water value is obtained; and calcining the dry-based petroleum coke, and circularly using flue gas collected by calcining for heating and drying the wet-based petroleum coke to form a closed cycle. High-temperature flue gas obtained after calcination is subjected to heat exchange to form low-temperature flue gas, the low-temperature flue gas is used for drying wet-based petroleum coke, a flue gas circulation system is formed, and multi-stage utilization of waste heat is achieved. Meanwhile, the dried petroleum coke can reduce energy consumption required by water evaporation during calcination, and erosion of water vapor to a hearth refractory material is avoided. Therefore, the negative influence of petroleum coke moisture on the heat efficiency is reduced while the waste heat utilization rate after petroleum coke calcination is improved.

The invention discloses a high belite iron aluminate cement clinker, which is prepared from the following raw materials in parts by weight: 39 to 73 parts of carbide slag, 8 to 37 parts of low-grade bauxite, 10 to 16 parts of ardealite, 1 to 31 parts of fly ash and 3 to 9 parts of steel slag. According to the cement clinker, the resource utilization rate of industrial solid waste in cement preparation can be remarkably increased, and dependence on natural raw materials and high-grade raw materials is reduced; impurities in various solid wastes can be used as in-situ mineralizing agents and activating agents, and on the basis of realizing high-added-value resource utilization of various industrial solid wastes and low-grade bauxite, efficient synthesis of target minerals at a relatively low temperature is promoted; and gradient temperature control calcination and gradient cooling processes are further combined, so that sufficient crystallization and development of a target mineral phase can be effectively promoted, a clinker microstructure is optimized, excellent early strength and continuously increased later strength of the cement are ensured, and the common problems of strength shrinkage and the like of the traditional solid waste-based cement can be effectively avoided.

The invention belongs to the field of soft magnetic functional materials, and particularly relates to a low-loss high-superposition Fe-Si-Al magnetic powder core and a preparation method thereof, and the preparation method comprises the following steps: preparing a coating agent, passivating coated powder, bonding and lubricating, and pressing and annealing. According to the method, based on the hydrolysis characteristic of metasilicic acid and the hydrolysis promotion effect of the alkaline catalyst, nano-porous silicon dioxide is prepared as a coating agent, meanwhile, the etching effect of alkaline matter on silicon dioxide can effectively increase the specific surface area of the nano-porous silicon dioxide, and the bonding strength of the nano-porous silicon dioxide and iron-silicon-aluminum powder is improved; the vacuum calcination treatment not only removes residual reagents, but also promotes sufficient thermal decomposition of metasilicic acid into silicon dioxide for in-situ coating, and stabilizes the lattice structure of the metasilicic acid. The coating layer of the low-loss high-superposition Fe-Si-Al magnetic powder core is firm in combination, thin and uniform in thickness and stable and compact in structure, the hysteresis loss of the Fe-Si-Al magnetic powder core can be effectively reduced, the direct-current bias performance is improved, and rising of eddy-current loss is avoided.

The invention relates to the technical field of environmental chemistry, in particular to a double-vacancy Fe0. 96S (at) MoS2 nano composite material as well as a wet-type mechanochemical synthesis method and application thereof. The preparation method comprises the following steps: firstly carrying out co-ball milling by utilizing a wet mechanical chemical synthesis method to obtain a low-crystallinity Fe0. 96S (at) MoS2 precursor, and then carrying out further calcination treatment to accelerate the thermal reaction of the precursor, improve the crystallinity and remove redundant sulfur powder impurities, thereby obtaining the high-crystallinity Fe0. 96S (at) MoS2 nano composite material. Iron powder is introduced in the process of preparing MoS2 nanosheets from molybdenum powder and sulfur powder, the reaction activity of the molybdenum powder and the sulfur powder is improved and the formation energy of MoS2 is reduced by utilizing the characteristic of ball-milling heat release of the iron powder and the sulfur powder, the reaction barrier that MoS2 is difficult to prepare between Mo and S through a mechanical ball-milling process originally is broken, and the generation of the MoS2 nanosheets is promoted.

The invention discloses a lanthanum-doped CuMgAl catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the lanthanum-doped CuMgAl catalyst comprises the following steps: adding a copper salt, a magnesium salt, an aluminum salt and a lanthanum salt into water to obtain a first solution; adding a precipitator into water to obtain a second solution; adding the second solution into the first solution to adjust the pH value to 10.5 to obtain a mixed solution, stirring the mixed solution to generate a co-precipitation reaction, after the reaction is completed, carrying out aging treatment to promote growth and structure ordering of layered double hydroxide crystals, and then carrying out calcination treatment to convert a layered double hydroxide precursor into an oxide, thereby obtaining the layered double hydroxide. And the lanthanum-doped CuMgAl catalyst is obtained. The lanthanum-doped CuMgAl catalyst prepared by the preparation method disclosed by the invention has excellent activity and stability.

The invention relates to the field of catalysts, in particular to a preparation method of a green and efficient copper catalyst. Comprising the following steps: (1) mixing basic cupric carbonate, ammonia water and water, adding ammonium salt at the same time, and preparing a copper ammonia solution as a precursor solution at room temperature; (2) mixing the precursor solution with a carrier or a carrier precursor to realize active component loading and catalyst preparation; and (3) filtering, washing, drying and roasting the mixed system in the step (2) to prepare the copper-based catalyst. According to the preparation method of the copper ammonia complexing precursor solution, preparation of the copper ammonia complexing solution at room temperature can be achieved, heating operation in the precursor preparation process is avoided, meanwhile, the nitrogen content of the system and nitrogen emission in the subsequent roasting process can be reduced by preparing the copper-based catalyst through the basic copper carbonate precursor, and efficient and green preparation of the catalyst is achieved.

The invention discloses a composite system geopolymer grouting material and a preparation method thereof. The composite system geopolymer grouting material comprises the following raw materials in percentage by mass: 50-70% of coal gangue, 10-30% of fly ash and 10-30% of cement. Functional additives: 5%-20% of desulfurized gypsum and 5%-15% of bentonite; the composite exciting agent is formed by compounding carbide slag and sodium silicate according to the mass ratio of 1: 1-1: 2. The geopolymer is excellent in mechanical property, meets engineering requirements, is remarkable in environmental protection benefit, conforms to double-carbon target low-carbon process innovation: a calcination-free process: traditional high-temperature calcination is abandoned (the temperature needs to be 550-900 DEG C), carbon emission is reduced by more than 30% (compared with a contrast, the carbon emission of a traditional process is increased by 35%), and the geopolymer conforms to the green positioning of low energy consumption and low three wastes of geopolymers. The cost advantage is prominent, the economic value is remarkable, the raw material cost is reduced, specifically, the coal gangue (low-cost solid waste) is used for replacing 30%-50% of cement, and the comprehensive raw material cost is reduced by 40% (compared with a traditional cement-based grouting material).