442 results about "Reducing atmosphere" patented technology

The invention provides a production process for stably controlling adhesive force of a DP steel zinc layer. The production process comprises the following steps: step 1, setting a heating section 1, a heating section 2 and a furnace nose section in a total radiation heating annealing furnace; 2, according to the model and thickness of DP steel, target dew points of a first heating section, a second heating section and a furnace nose section are set; 3, according to the target dew points set in the first heating section, the second heating section and the furnace nose section in the step 2, water vapor is put into the protective gas for humidification, and the water vapor reacts with Si, Mn and Cr elements enriched on the surface of the steel plate to generate volatile oxides; the dew point of the annealing furnace is precisely controlled in a segmented mode, different humidification modes are adopted, and the surface state is controlled, so that surface oxide residues are reduced, cleanliness of a steel substrate is guaranteed, and the binding force of a zinc layer is improved; the iron oxide layer formed on the surface of the steel plate enters a reducing atmosphere annealing furnace containing hydrogen, the hydrogen can reduce the iron oxide layer on the surface of the steel plate to form a reduced iron layer, and the adhesive force of a zinc layer is improved.

The invention relates to the technical field of solar cells, in particular to copper-based paste, a TOPCon cell and a preparation method of the TOPCon cell. The copper-based slurry includes: copper powder as main powder densified in a sintering process to form a conductive phase; the hydrogen storage material is used for releasing a hydrogen element in the sintering process and locally forming a reducing atmosphere so as to prevent the copper powder from being oxidized; the hydrogen storage material comprises a liquid hydrogen storage material; and the organic carrier provides fluidity and thixotropy for the slurry. Compared with solid hydrogenated metal particles, the liquid hydrogen storage material can be more uniformly dispersed in the copper-based slurry and can coat the copper powder, so that the hydrogen element released from the copper-based slurry is more uniform, and the oxidation of the copper powder can be comprehensively inhibited. Meanwhile, the dehydrogenation amount of the liquid hydrogen storage material is far higher than that of the solid hydrogenated metal particles, the release amount of hydrogen elements can be increased by multiple times under the same mass, and then more sufficient oxidation protection is provided for the copper powder.

The invention discloses a method for improving corrosion resistance of steel, and belongs to the technical field of metal protection. The method for improving the corrosion resistance of the steel comprises the following procedures of acid pickling, rinsing, drying, reduction, hot dipping, passivation, drying and packaging. Replacing a plating assisting process in the hot dipping process with a thermal reduction process; and in the thermal reduction process, hydrogen with the volume content of 3-25% is adopted for thermal reduction. A plating assisting technology in a traditional hot dipping technology is replaced with a reduction technology, the steel obtained after acid pickling is dried and then fed into the atmosphere box, a small amount of iron oxide remaining on the surface of the steel is reduced into sponge iron in the hydrogen reduction atmosphere, the surface of the steel keeps active, and then a zinc-based or zinc alloy plating layer can be better plated; therefore, the corrosion resistance of the steel is greatly improved, and the service life is prolonged.

The invention belongs to the technical field of ceramic materials, and relates to high-thermal-conductivity silicon nitride ceramic and a preparation method thereof. The invention discloses a preparation method of high-thermal-conductivity silicon nitride ceramic, which comprises the following steps: (1) uniformly mixing silicon powder and a sintering aid to obtain mixed powder, and carrying out compression molding on the mixed powder to obtain a silicon blank; the sintering aid is a rare earth metal oxide; (2) placing the silicon blank in a nitrogen-containing reducing atmosphere environment, pre-treating at 600-1180 DEG C, heating to 1350-1700 DEG C, and carrying out nitriding treatment to obtain a silicon nitride blank; and (3) placing the silicon nitride green body in an inert atmosphere, and sintering at 1800-2200 DEG C to obtain the silicon nitride ceramic. The pretreatment step is added before the nitridation reaction, so that silicon dioxide impurities wrapped on the surface of the silicon powder are effectively eliminated, and the oxygen content in a liquid phase is reduced on the basis of not reducing the total content of a sintering aid, so that a silicon nitride blank with low lattice oxygen content is more easily prepared, and the heat conductivity of the silicon nitride ceramic is improved.

The invention relates to a process for extracting iron from red mud by using hydrogen reduction and electrolysis technologies, the red mud is a by-product generated in the industrial production process of aluminum, the environmental burden caused by the by-product can be solved, the carbon emission can be reduced, and the development of a green metallurgical technology can be promoted. Comprising the following steps: conveying red mud serving as a raw material into a rotary furnace, conveying hydrogen serving as a reducing medium into the rotary furnace, enabling iron oxide in the red mud to form hydrogen reduced iron in a furnace heating state and a hydrogen reducing atmosphere, conveying the red mud containing the hydrogen reduced iron into a sulfuric acid solution, the hydrogen reduced iron is dissolved in the sulfuric acid solution to form a sulfuric acid solution containing iron ions, the sulfuric acid solution containing the iron ions serves as an electrolyte in an electrolysis device, and electrolytic pure iron formed by electrolytic deposition of the iron ions is obtained through the electrolysis device.

The invention relates to a nano silicon carbide whisker and a preparation method thereof, and the preparation method comprises the following steps: (1) carrying out acid process treatment on fly ash by using an acid solution, so that the content of key impurity elements in the fly ash accounts for 2-11% of the total mass of the treated fly ash, and obtaining acid-treated fly ash; (2) mixing the acid-treated fly ash with a first carbon source to obtain a mixture; and (3) covering the mixture with a second carbon source, roasting in a reducing atmosphere to obtain a roasted material which comprises a nano silicon carbide whisker layer and a total impurity layer positioned below the silicon carbide whisker layer, and removing the total impurity layer to obtain the nano silicon carbide whisker. According to the preparation method, the low-cost fly ash is taken as a raw material, the advantages of low preparation cost and relatively high product yield can be taken into account through the synergistic effect of moderate acid treatment, raw material position setting and roasting in the reducing atmosphere, and good morphology and relatively high purity of the nano silicon carbide crystal whiskers are ensured.

The application discloses a platinum-based high-entropy intermetallic compound and a preparation method and application thereof as a hydrogen fuel cell cathode catalyst, and belongs to the field of fuel cells.The preparation method comprises the following steps: S01, adding platinum salt, at least five other metal salts and a nitrogen-rich organic compound into an organic solvent, uniformly mixing, and obtaining a metal precursor mixed solution; S02, adding a carbon carrier into the metal precursor mixed solution, fully mixing, drying, collecting, and obtaining a precursor; and S03, heat treating the dried precursor under a reducing atmosphere, and performing heat preservation treatment, so as to obtain the platinum-based high-entropy intermetallic compound.The preparation method is simple, low in cost and good in repeatability, the prepared catalyst has the advantages of uniform particle size and high oxygen reduction activity, and has a good development prospect in the field of hydrogen fuel cell catalyst applications.

The invention belongs to the technical field of catalytic materials and hydrocarbon reforming, and particularly relates to a high-entropy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution containing lanthanum, chromium, copper, zinc, manganese, nickel, iron and cobalt ions with a chelating agent and a dispersing agent for reaction, carrying out ultrasonic cavitation treatment to obtain sol, adjusting the pH value, gelatinizing under an oil bath heating condition to obtain a colloidal precursor, drying, and calcining in an air atmosphere to obtain a perovskite type high-entropy oxide precursor; and then treating in a reducing atmosphere to obtain the FeZnCuNiCo perovskite type high-entropy alloy catalyst which contains metal components of La, Cr, Ni, Mn, Fe, Zn, Cu and Co and takes a multi-metal alloy active center of Fe-Zn-Cu-Ni-Co as a main component. The high-entropy catalyst can meet the harsh requirements of high temperature, strong carbon deposition driving force and long-period operation in a propane dry reforming reaction, and is suitable for industrial application scenarios of continuous production of high-temperature synthesis gas.

The invention relates to the technical field of coal gangue resource utilization, in particular to a magnetic coal series kaolin hydrogel adsorbing material as well as a preparation method and application thereof. The preparation method of the material specifically comprises the following steps: carrying out ultrafine grinding, sieving and grading on coal gangue ore to obtain a coal series kaolinite material; further performing magnetic separation to obtain coal series kaolinite iron-rich tailings; further performing magnetizing roasting in a reducing atmosphere to obtain magnetic coal series kaolin; the preparation method comprises the following steps: compounding magnetic coal series kaolin with sodium alginate and chitosan by adopting a gel coating method, dropwise adding a calcium chloride solution for crosslinking, and freeze-drying to obtain the magnetic coal series kaolin hydrogel material. The preparation method is simple, and the obtained adsorption material has the characteristics of low cost, large adsorption capacity, high adsorption rate, high selectivity, excellent cyclic utilization performance and the like.

The invention belongs to the technical field of catalysts, and discloses an ammonia decomposition hydrogen production catalyst and a preparation method and application thereof. The preparation method of the catalyst for hydrogen production through ammonia decomposition comprises the following steps: in an inert atmosphere, successively carrying out calcination and acid treatment on a carbon carrier to prepare an acid-treated graphitized carbon carrier; adding a ruthenium precursor, a rare earth element precursor and an alkali metal precursor into ethanol, and mixing to prepare a mixed solution; then adding a graphitized carbon carrier into the mixed solution, and mixing; then adding urea and a surfactant, continuously mixing, and standing to obtain a solid precipitate; and finally, carrying out heat treatment on the solid precipitate in a reducing atmosphere. The catalyst takes a highly graphitized carbon material as a carrier, an alkali metal is doped to provide an alkaline environment, and a rare earth metal oxide and Ru form dual-assistant synergistic regulation of an interface, so that low-temperature high-activity ammonia decomposition hydrogen production and long-acting stable operation are realized.

The invention discloses a method for separating valuable metal in a waste photovoltaic welding strip through reduction smelting-vacuum gasification-vulcanization, and belongs to the technical field of resource recycling. The method comprises the steps that the waste photovoltaic welding strip is placed in a reducing atmosphere and heated for reduction smelting, so that carbon impurities on the surface of the waste photovoltaic welding strip are removed, tin, lead, silver and copper oxides on the surface are reduced, and a copper-tin-lead-silver alloy is obtained; then, heating the decarbonized and deoxidized photovoltaic welding strip under a vacuum condition, and carrying out vacuum gasification separation to obtain condensed metal lead and a copper-tin-silver alloy; and finally, sulfur is added into the copper-tin-silver alloy for vacuum vulcanization-separation, and volatile matter stannous sulfide and residual copper-silver alloy are obtained. According to the method, valuable metals in the waste photovoltaic solder strip can be efficiently separated, and the method has the advantages of being green and economical.

The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a process suitable for roasting activation of coal gangue. The process comprises the following steps: crushing and screening coal gangue to obtain a raw material; preheating at the temperature of 200-750 DEG C to extract volatile components; an inert or micro-reducing atmosphere is introduced at the temperature of 400-600 DEG C for phase control treatment; roasting and activating at 900-1200 DEG C in a mixed atmosphere of nitrogen, carbon dioxide and water vapor in a segmented heating manner; after roasting, slowly cooling and stabilizing in an atmosphere containing CO2 and water vapor; and finally, alkali leaching is adopted for desilicication, so that the aluminum-silicon ratio of the coal gangue is increased to 4-8. Through the process, local overburning and unfavorable crystal phase transformation can be effectively avoided, excessive generation of mullite is inhibited, and the separation state of aluminum oxide and silicon dioxide is kept, so that the desilicication efficiency and the dissolution rate of aluminum oxide are remarkably improved, and a feasible path is provided for efficient utilization of coal gangue resources.

The invention discloses a layered, zoned and differentiated CO2 injection system and method for a blast furnace, and belongs to the technical field of ferrous metallurgy low carbon. The system comprises a CO2 supply and distribution system, a tuyere area injection module, a furnace body middle-lower part injection module and a furnace body upper part injection module. And according to the temperature gradient and atmosphere layering characteristics in the blast furnace, a differential CO2 distribution proportion and a collaborative thermal compensation strategy are adopted. An oxygen-CH4 synergistic injection device is arranged in a tuyere area, and rapid conversion of CO2 is promoted by using a high-temperature strong reducing atmosphere; a biomass charcoal synergistic injection device and an angle-adjustable nozzle are arranged at the middle lower part of the furnace body, so that efficient gasification reaction is realized; and low-concentration CO2 mixed injection is adopted at the upper part of the furnace body, so that indirect reduction reaction is promoted. According to the invention, the CO2 conversion rate is 65-80%, the coke ratio is reduced by 15-25%, the consumption of CO2 per ton of iron is 260-90Nm < 3 >, the carbon emission is obviously reduced, and the ironmaking efficiency is improved.

The invention discloses an oxygen evolution-free sodium carbonate composite material as well as a preparation method and application thereof. The preparation method of the composite material comprises the following steps: carrying out powder refinement treatment on a sodium carbonate precursor to obtain particles with the average particle size from micron to nanoscale; s2, uniformly mixing the sodium carbonate precursor treated in S1 with a conductive carbon material to form a composite precursor; placing the composite precursor in an inert atmosphere or a reducing atmosphere, calcining the composite precursor at 400-900 DEG C, and then cooling the composite precursor to room temperature to obtain the oxygen evolution-free sodium carbonate composite material, wherein the conductive carbon material is a high-specific-surface-area carbon material of which the surface is rich in at least one of carbonyl, carboxyl and hydroxyl. The composite material obtained by the method disclosed by the invention is applied as a pre-sodium-modified additive, so that the decomposition voltage of the pre-sodium-modified additive can be greatly reduced, and oxygen evolution is effectively inhibited, thereby improving the first-week coulombic efficiency, cycling stability and overall safety performance of the sodium-ion battery.

The invention relates to the technical field of anaerobic methanogenesis, and provides a polyurethane foam filler as well as a preparation method and application thereof. The polyurethane foam filler comprises a polyurethane foam body and auxiliaries dispersed in the polyurethane foam body, and the auxiliaries comprise nano zero-valent iron, molybdate and a conductive carbon material. According to the polyurethane foam filler provided by the invention, through the synergistic effects of filler surface hydrophilicity, reducing atmosphere, inhibition on sulfate reduction reaction, promotion on interspecific electron transfer and the like, the starting of an anaerobic methanogenesis process can be accelerated, the impact resistance is enhanced, the efficiency of the anaerobic methanogenesis process and the reaction operation stability are effectively improved, and the service life of the polyurethane foam filler is prolonged. And the method has wide practical value and application prospect.

The utility model discloses a flash and top-blowing coupled molten pool tin smelting device, which belongs to the technical field of pyrogenic smelting of crude tin and comprises a top-blowing molten pool and a top-blowing spray gun. Wherein the lower half part of the top-blowing spray gun extends into the top-blowing molten pool, and tin concentrate, tin middling subjected to fuming enrichment and powdery tin smoke dust are subjected to ore blending with a flux and then are smelted; adding a carbonaceous reducing agent into the molten pool, and reducing to form a CO reducing atmosphere layer at the upper part of the slag layer; and blowing fluidized bed furnace roasting dry powder to the upper part of the CO reducing atmosphere layer, carrying out flash reduction smelting on the fluidized bed furnace roasting dry powder, enabling the fluidized bed furnace roasting dry powder which is not subjected to flash reduction smelting to enter a molten pool, and continuing to carry out a reduction stage in top-blowing molten pool smelting, so that flash and top-blowing coupling is realized, and crude tin is prepared. According to the utility model, flash and top-blowing molten pool smelting are effectively coupled together, fuel consumption can be reduced by about 20%, and the bed capacity is obviously improved.

The invention discloses a near-wall air device for preventing high-temperature corrosion of a front and back wall hedging pulverized coal boiler, and relates to the technical field of application of near-wall air of pulverized coal boilers. The close-to-wall air device for preventing the high-temperature corrosion of the front and rear wall hedging pulverized coal fired boiler comprises a close-to-wall air nozzle arranged on the side wall of a hearth, the hearth comprises a furnace wall, the side wall of the hearth is provided with a plurality of wall-type arranged over fire air nozzles and wall-type arranged burner nozzles, and the close-to-wall air nozzle is arranged on the side wall of the furnace wall in a penetrating mode. By means of the wall-attached air nozzles, in the using process, according to the requirement for preventing high-temperature corrosion of the boiler in the reducing atmosphere, multiple layers of wall-attached air can be arranged on the wall face of the side wall of the hearth, each layer of wall-attached air comprises the multiple wall-attached air nozzles, and the area, prone to high-temperature corrosion, of the wall face of the boiler can be completely covered; the oxidizing atmosphere of the near-wall area is formed, the risk of high-temperature corrosion of the water cooling wall is effectively avoided, and meanwhile the air volume corresponding to each piece of near-wall air can be adjusted according to actual needs.

The invention provides a preparation method of porous metal copper, which comprises the following steps: S1, adding copper oxide powder and a pore-forming agent into an organic solvent, and stirring and mixing to obtain slurry; in the slurry, the mass percentages of the copper oxide, the pore-forming agent and the organic solvent are 60%-70%, 0-10% and 20%-30% respectively; s2, printing the slurry through a steel mesh to obtain a biscuit; s3, the biscuit is sintered in a reducing atmosphere, the sintering temperature ranges from 600 DEG C to 900 DEG C, the sintering time ranges from 2 h to 8 h, and a sintered body is obtained after cooling; and S4, the sintered body is cleaned and freeze-dried, and the porous metal copper is obtained. According to the technical scheme, by controlling the technological parameters such as the size of the copper oxide, the content of the pore forming agent and the size and shape of the steel mesh, the prepared porous metal copper is controllable in pore size, size and proportion, the process is simple, the cost is low, and batch preparation of the porous copper can be achieved.

The preparation method mainly comprises the following steps: dissolving chloroplatinic acid, lanthanum salt and manganese salt in water according to a certain proportion, adding a complexing agent, adjusting the pH value, and carrying out gelation, drying and high-temperature calcination to obtain a perovskite precursor; and treating in a reducing atmosphere, so that platinum atoms are selectively dissolved out from crystal lattices, high-dispersion platinum nanoparticles are formed on the surface, and finally, the composite catalyst with extremely low platinum loading capacity is obtained. According to the method, platinum species are stably anchored through the perovskite carrier, the platinum atom utilization rate and catalytic stability are remarkably improved, excellent electrocatalytic activity and durability are shown in the oxygen reduction reaction, and the method can be widely applied to energy conversion equipment such as zinc-air cells and fuel cells and has important practical application value.

This invention belongs to the field of catalyst technology, providing a CO purification oxygen-rich catalyst, its preparation method, and its application. The preparation method involves dispersing γ-alumina in water, then sequentially adding copper nitrate and cerium nitrate to obtain a reaction solution. The reaction solution is mixed with an inorganic base, followed by a substitution reaction and a crystallization reaction to obtain a catalyst precursor. The catalyst precursor is calcined under a reducing atmosphere to obtain the CO purification oxygen-rich catalyst; the reducing atmosphere includes hydrogen. This preparation method generates sufficient active sites through a copper-cerium binary system, and then utilizes the basic groups provided by the inorganic base to form a low-valence metal-hydroxyl composite structure under a reducing atmosphere. Through the combined action of metal atoms, hydroxyl groups, and active oxygen sites, the research goals of high efficiency, stability, high selectivity, and economy are achieved. Furthermore, this preparation method does not use precious metals, resulting in low cost.

The application discloses a method for preparing Fe-CaTiO3 heterogeneous visible light Fenton catalyst from vanadium-titanium magnetite, and comprises the following steps: (1) vanadium-titanium magnetite powder, bentonite, slaked lime and water are mixed according to a proportion, and then enter a disc balling machine to be balling to prepare green balls; (2) the green balls prepared in the step (1) are dried and roasted to prepare oxidized pellets; (3) the oxidized pellets are reduced in a hydrogen-rich reducing atmosphere to obtain direct reduced iron (DRI) containing CaTiO3; (4) the DRI is cooled to below 50 DEG C under the protection of inert gas; and (5) the cooled DRI is crushed and ball milled, and thus Fe-CaTiO3 is obtained. The prepared Fe-CaTiO3, H2O2 and visible light constitute a photo-assisted heterogeneous Fenton reaction system, which can efficiently catalyze degradation of organic pollutants in wastewater; and the method has the advantages of low preparation cost, high catalytic activity, easy recovery and reusability.

The invention relates to the technical field of preparation of environmental functional materials, and discloses a directional synthesis method of magnetic porous iron-doped graphitized biochar, which is realized by the following steps: cooperatively inducing low-temperature graphitization by utilizing a biomass endogenous S < 2 > self-template and nano-diamond; performing double-complexing ultrasonic impregnation on the iron precursor to realize nanoscale dispersion; performing staged pyrolysis, pre-carbonizing in an inert atmosphere to construct a carbon skeleton, and synchronously completing iron reduction and graphitization in a reducing atmosphere; performing mixed pickling to synchronously remove the template and construct a passivation layer; and finally, carrying out magnetic separation to obtain the high-porosity and uniformly iron-doped magnetic graphitized charcoal. A graphitized porous structure is realized through cooperation of a low-temperature self-template and nano-diamond, iron agglomeration is inhibited through a double-complexing ultrasonic technology, a protective layer and active sites are synchronously constructed through mixed pickling and passivation, and three technical barriers of high-temperature collapse, iron particle inactivation and short cycle life of a traditional process are broken through.

The invention relates to the technical field of solid waste harmless and recycling equipment, in particular to a gradient temperature pyrolysis-melting vitrification integrated treatment device and process for red mud. According to the device, an electromagnetic heating rotary kiln pyrolysis section and an electrode melting section are directly coupled with a material transfer device through high-temperature atmosphere isolation. The process comprises the following steps: granulating red mud, a reducing agent and a flux, feeding into a rotary kiln of which the temperature is accurately controlled by multiple groups of electromagnetic induction coils in a partitioned manner, and sequentially completing dehydration, selective reduction and iron particle polymerization to produce gt; high-temperature pyrolysis slag at 1000 DEG C; the pyrolysis slag directly falls into an electric melting pool to complete melting and iron-slag liquid phase separation under absolute isolation of reducing atmosphere and oxidizing atmosphere by the device, and pig iron and a stable glass body are respectively obtained. Through the design of'hot slag direct melting 'and'energy closed loop', the problems of high energy consumption and complex flow of the traditional process are solved, and efficient recovery of iron resources in the red mud and thorough harmless and high-valued utilization of the residues are realized.

The invention discloses a low-energy-consumption method for preparing high-metallization-ratio reduced iron blocks from laterite-nickel ore high-pressure acid leaching residues, and belongs to the technical field of metallurgical solid waste recycling. The method comprises the following steps: performing low-temperature reduction roasting on the laterite-nickel ore high-pressure acid leaching residues in a reducing atmosphere to obtain primary roasted sand; carrying out high-temperature desulfurization roasting on the primary roasted product in a non-reactive atmosphere to obtain a final roasted product; and carrying out hot press molding on the final roasted product to obtain the reduced iron block. According to the method, the technological process of reduction, desulfurization and hot pressing is adopted, the method has the advantages that the process is compact, energy consumption is low, iron and sulfur elements are easy to recover and the like, the laterite-nickel ore high-pressure acid leaching residues can be efficiently converted into high-quality reduced iron blocks with high strength, low impurity and high metallization ratio, high-concentration SO2 meeting the acid making requirement is synchronously obtained, and the method is suitable for industrial production. According to the method, large-scale and high-valued clean utilization of iron and sulfur resources in the laterite-nickel ore high-pressure acid leaching residues is achieved, and the method is mild in technological condition and stable in operation and has a good industrial application prospect.

The invention discloses a RuIr-Gd2O3 bimetallic catalyst, a preparation method thereof and application of the RuIr-Gd2O3 bimetallic catalyst in a reaction for preparing synthesis gas by catalyzing N2O methane oxide dry reforming. The RuIr-Gd2O3 bimetallic catalyst is prepared from a Gd2O3 carrier and a RuIr bimetallic nano-alloy loaded on the Gd2O3 carrier, and the RuIr-Gd2O3 bimetallic catalyst is prepared from the RuIr-Gd2O3 bimetallic nano-alloy. The preparation method comprises the following steps: mixing the Gd2O3 carrier with a solution containing a Ru precursor and an Ir precursor, carrying out a stirring reaction under ultraviolet irradiation, evaporating the solvent to dryness, drying, and roasting in a reducing atmosphere to obtain the RuIr-Gd2O3 bimetallic catalyst. According to the method, efficient activation of N2O, precise cracking of CH4 and selective oxidation of an intermediate are realized through oxygen species slow release, redox center separation and bimetal site coordination strategies, so that the catalyst has high conversion rate and high CO / H2 yield at low temperature, and shows huge potential of cooperatively utilizing greenhouse gases under mild conditions.

This invention relates to the field of comprehensive utilization of solid waste, specifically providing a process for treating ilmenite ore using solid waste pyrolysis products. The process involves preheating the ilmenite ore to above 1000°C with low-oxygen flue gas, then feeding it along with waste plastics, waste coke, and other raw materials into a pyrolysis reduction reactor for pyrolysis reduction. The pyrolysis of waste plastics and waste coke generates reducing gases, ensuring the device is completely in a reducing gas atmosphere. These gases react with the ilmenite ore at high temperatures to generate magnetically separable elemental iron and Fe3O4, thereby increasing the actual FeTiO3 content. Compared to existing ilmenite ore processing technologies, this method significantly increases the processing temperature, improves processing efficiency, and achieves comprehensive energy utilization.

The invention relates to the technical field of soft magnetic materials, and discloses a soft magnetic composite material, a preparation method thereof and a magnetic element, and the preparation method of the soft magnetic composite material comprises the following steps: dissolving an iron source, a silicon source and a complexing agent in a first solvent to obtain sol; soft magnetic particles are dispersed in the sol, aging and first sintering are sequentially carried out on the sol, the first sintering is carried out in a reducing atmosphere, a coating layer coating at least part of the surface of the soft magnetic particles is generated, and the coating layer comprises Fe2SiO4. The coating layer comprises Fe2SiO4, so that the insulating property and the magnetism of the soft magnetic composite material are balanced, the soft magnetic composite material has high insulating property and magnetism, the structural stability and the magnetic stability of the soft magnetic composite material are improved, and the soft magnetic composite material is suitable for a wider temperature range.

The present application provides a method for preparing spherical iridium powder, relating to the field of iridium powder preparation. An iridium raw material and an alkaline reagent are mixed to obtain a mixture, and the mixture is subjected to a first calcination to obtain a calcined product; the calcined product is acid-washed to obtain an acid-washed product; the acid-washed product is plasma-spheroidized in a mixed atmosphere of argon and hydrogen to obtain a plasma-spheroidized product; the plasma-spheroidized product is atomized to obtain an atomized product; the atomized product is subjected to multi-stage cooling to obtain cooled iridium powder; the cooled iridium powder is graded, and a second calcination and cooling are performed in a reducing atmosphere to obtain spherical iridium powder. This method achieves spherical iridium powder with uniform particle size and high sphericity, thereby improving the density and stability of the spherical iridium powder.

The application discloses a method for comprehensively recovering valuable metals in gold smelting slag, and belongs to the technical field of metallurgical solid waste resource utilization, and comprises the following steps: S1, ingredient mixing: uniformly mixing gold smelting slag, a chlorinating agent and a reducing agent according to a mass ratio, preparing into a pellet, and obtaining a mixture; S2, one-step chlorination and reduction roasting: after the mixture obtained in the step S1 is dried, the mixture is sent into a roasting furnace to be roasted, and chlorination volatilization of the valuable metals and reduction magnetization of iron oxides are simultaneously completed in the same roasting system; through accurate proportioning of the chlorinating agent and the reducing agent and synergistic regulation of the roasting temperature and the weak reducing atmosphere, the chlorination volatilization of gold, silver, copper, lead and zinc and the reduction magnetization of iron oxides are simultaneously completed in a single reactor and in the same roasting process, the problems of mutual contradiction between chlorination and reduction atmosphere and mutual restriction of recovery rates of two-step roasting processes are solved, the total roasting time is effectively shortened, and the comprehensive energy consumption is effectively reduced.

The application belongs to the field of preparation of anode catalysts for solid oxide direct ammonia fuel cells, and particularly relates to a misfit-loaded praseodymium-based anode catalyst for direct ammonia solid oxide fuel cells and a preparation method thereof. 2+ doping Pr2NiO4 to prepare a perovskite Pr2Ni 1‑x Zn x O4 precursor, which is subjected to in-situ precipitation of Ni under a reducing atmosphere, is anchored on the catalyst surface in the form of an element, and is converted into Pr2O3 with the destruction of the structure of the precursor, and Zn 2+ with a high segregation Gibbs free energy is retained in the Pr2O3 lattice, realizing the rearrangement of each element, and forming a misfit-loaded Ni / Pr 2‑x Zn x O3 (PNZx), 0