1353 results about "Cobalt" patented technology

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention discloses a high-hardness tungsten carbide-cobalt hard alloy and a preparation method thereof. A production raw material formula comprises the following components in parts by mass: 100 parts of tungsten carbide powder, 6-20 parts of cobalt powder, 0.2-1.3 parts of a composite sintering aid, 0.5-4 parts of a wet grinding medium and 0.2-4 parts of a forming agent, the composite sintering aid is composed of rare earth oxide and cobalt phosphide according to the mass ratio of (1-5): 1. The method has the advantages that on the premise that the toughness of the tungsten carbide-cobalt hard alloy is slightly improved, the hardness and wear resistance of the alloy are remarkably improved, and the industrial problems that the hardness improvement of the tungsten carbide-cobalt hard alloy with a single sintering aid is limited and the toughness of the alloy is lost are solved.

The invention is suitable for the technical field of photocatalyst preparation, and provides a modified tubular g-C3N4 loaded Ni-CoP photocatalyst and a preparation method thereof. The preparation method comprises the following steps: calcining a carbon nitride precursor in stages to obtain tubular carbon nitride, stirring the tubular carbon nitride with a cobalt and nickel-containing compound and an alkaline compound, washing and drying to obtain a precipitate, calcining, mixing and grinding with a phosphorus-containing compound, calcining again, and modifying the product with polydopamine and polypyrrole to obtain the composite material. The photocatalyst modified by the polydopamine and the polypyrrole and loaded with the Ni-CoP by taking the tubular g-C3N4 as the carrier is obtained. According to the invention, three-in-one synergistic integration of'carrier-modifier-cocatalyst 'is realized, the prepared photocatalyst still keeps tubular morphology and has a larger specific surface area, the requirements of anode oxygen evolution reaction (OER) on rapid charge separation and transmission can be met, meanwhile, the light absorption range is widened, the solar energy utilization rate is increased, and a foundation is laid for efficient OER reaction.

The invention belongs to the technical field of new energy materials and bioelectrochemistry, and particularly relates to an iron-based multi-metal sulfide composite carbon anode material and a preparation method of the iron-based multi-metal sulfide composite carbon anode material. The preparation method is simple in process flow, convenient to operate, easy for large-scale production, wide in raw material source, low in cost and environment-friendly, and can be used for preparing the three-dimensional porous carbon matrix which is formed by foaming and carbonizing polyvinylpyrrolidone and is provided with interconnected carbon nanosheets. Through reasonable composition design and structural regulation, and optimization of metal ratio and vulcanization conditions, accurate regulation of material performance can be realized, electrochemical performance and biocompatibility are significantly improved, electricity generation performance and operation stability of a microbial fuel cell are improved, and good industrial application prospects are achieved.

The invention discloses an HVOF spraying coating and a preparation method and application thereof, and belongs to the technical field of high-end equipment manufacturing, and the preparation method of the HVOF spraying coating comprises the following steps that hypersonic flame spraying is adopted, and a transition layer and a working layer are sequentially sprayed on the surface of a base body; the transition layer is made of NiCr (nickel chromium)-CoCrFeNiMo (cobalt chromium) or NiCr (nickel chromium); and the working layer is at least one of the following components: 10 < CoCr > FeNi < 18 > NiCr < 72 > Cr3 < C2 >, 20 < CoCr > FeNi < 16 > NiCr < 64 > Cr3 < C2 >, 75 < NiCr > < 25 > Cr3 < C2 >, 25 < NiCr > < 75 > Cr3 < C2 > and 50 < NiCr > < 50 > Cr3 < C2 >. According to the HVOF spraying coating prepared through the method, collaborative optimization of high-temperature wear resistance and corrosion resistance is achieved, and an effective path is provided for design of a high-performance protective coating under the complex working condition.

The application discloses a method for preparing a metal organic framework film by magnetic field induction regulation control. The method comprises the following steps: vertically immersing a sheet carrier into a film forming solution of the metal organic framework film; placing a container provided with the film forming solution and the carrier into a uniform magnetic field; and standing for 4-24 hours to obtain the metal organic framework film prepared by the magnetic field induction regulation control. The metal organic framework film is a cobalt-based, nickel-based or iron-based metal organic framework film. The carrier material comprises alumina, porous carbon and porous organic material. The magnetic field direction is perpendicular to or parallel to the surface of the carrier. The metal organic framework film prepared by the application has excellent gas separation performance, and the film forming process is simple, convenient, easy to enlarge and popularize.

The invention belongs to the technical field of rhenium alloy materials, and particularly relates to a high-strength rhenium alloy material and a preparation method thereof. The rhenium alloy material is prepared from the following raw materials in percentage by mass: 12 to 24 weight percent of molybdenum, 6 to 9 weight percent of niobium, 2 to 5 weight percent of cobalt, 1 to 3 weight percent of tungsten, 0.5 to 1.2 weight percent of modified tantalum carbide, 3 to 6 weight percent of high-entropy rare earth and the balance of rhenium and other inevitable impurities. The modified tantalum carbide is prepared by the following preparation process: adding tantalum chloride, zirconium oxychloride and phenolic resin into a mixed solution of acetylacetone and n-butyl alcohol, stirring for 1-2 hours under a heating condition, dropwise adding ammonia water, continuously stirring for 0.5-1 hour, and drying to obtain a precursor; calcining the precursor, and cooling to obtain the modified tantalum carbide. The rhenium alloy prepared through the method has high hardness, good bending strength and excellent high-temperature mechanical property.

The invention provides a ternary positive electrode precursor material and a preparation method and application thereof. The ternary positive electrode precursor material sequentially comprises a nickel-cobalt-manganese core, a nickel-cobalt-manganese transition layer and a nickel-cobalt-manganese shell from inside to outside, wherein the surface of the nickel-cobalt-manganese core is coated with the nickel-cobalt-manganese transition layer, and the surface of the nickel-cobalt-manganese transition layer is coated with the nickel-cobalt-manganese shell; wherein the nickel-cobalt-manganese core is also doped with a boron element; the molar content of nickel in the surface, close to the nickel-cobalt-manganese core, of the nickel-cobalt-manganese transition layer is smaller than the molar content of nickel in the nickel-cobalt-manganese core, the molar content of nickel in the nickel-cobalt-manganese transition layer is gradually reduced from inside to outside, and the molar content of nickel in the surface, close to the nickel-cobalt-manganese shell, of the nickel-cobalt-manganese transition layer is larger than or equal to the molar content of nickel in the nickel-cobalt-manganese shell; and the molar content of manganese in the nickel-cobalt-manganese shell is the highest. According to the precursor material, the lithium-nickel mixing phenomenon is inhibited, stress cracking easily caused by sudden change of components between the core and the shell from the core to the shell is relieved, the effect of inhibiting the side reaction of an electrolyte is also achieved, and the cycling stability and safety of the battery are improved.

The invention discloses a method for extracting copper fine powder by flotation of copper-containing ore, which belongs to the technical field of mineral processing, and comprises the following steps: after copper-containing raw ore is crushed, ground and classified by a cyclone, overflow enters flotation, and settled sand is returned for regrinding; sodium carbonate is added into graded overflow to adjust the pH, a sodium hexametaphosphate-polyacrylamide composite dispersant is added, and copper sulfate is added and stirred after low-temperature microwave heating; gradient flotation is conducted, specifically, copper sulfide is roughly selected, the pH is adjusted, an amino-sulfonic acid group synergistic modified layered double metal hydroxide / cobalt ferrite composite collecting agent is added, and rough concentrate 1 is obtained through high-frequency pulse air inflation flotation; copper oxide roughing is conducted, clear water is supplemented to adjust the pH, and a collecting agent is supplemented to obtain rough concentrate 2; scavenging is performed for three times, a collecting agent is added for flotation, and concentrate returns to the previous stage; the rough concentrates are combined, and magnetic impurities are removed through high-gradient magnetic separation to obtain magnetic concentrates; and carrying out microbiological leaching on tailings to recover copper. The composite collecting agent is prepared through layered double hydroxide carrier synthesis, amino modification, sulfonic acid group grafting and cobalt ferrite anchoring.

The invention provides a laterite-nickel ore leaching solution catalytic oxidation-fractional precipitation method, and relates to the field of hydrometallurgy, the method comprises the following steps: adding a catalytic oxidant and a first neutralizer into a laterite-nickel ore leaching solution to obtain a first filtrate and iron slag; adding a catalytic oxidant, a second neutralizer and a first coalescing agent into the first filtrate to obtain a second filtrate and a second precipitate; adding a third neutralizer and a first reducing agent into the second filtrate to obtain a nickel-cobalt precipitate and a third filtrate; adding a fourth neutralizer and a second reducing agent into the third filtrate to obtain a fourth precipitate and a fourth filtrate; mixing the second precipitate with a third reducing agent, performing reduction leaching, and adding a second coalescing agent and a fifth neutralizing agent to obtain a silicon-aluminum precipitate and manganese-scandium filtrate; the manganese-scandium filtrate is extracted, and manganese enters raffinate; and adding a catalytic oxidant and a sixth neutralizer into the raffinate to obtain the manganese oxide. Elements are recycled step by step, and the method has the advantages of multiple types of recycled elements, less resource waste and the like.

The invention discloses a nickel-cobalt-selenium (Co1-xNixSe2) nano material for electrocatalytic oxidation of ethylene glycol as well as a preparation method and application of the nickel-cobalt-selenium (Co1-xNixSe2) nano material. The material is prepared by a hydrothermal method which comprises the following steps: (1) pouring 20mL of deionized water containing 475.9 mg of CoCl2. 6H2O into a 1mol / L NaOH solution containing 0.32 g of selenium powder to prepare a precursor solution; (2) placing in a stainless steel autoclave with a polytetrafluoroethylene lining, carrying out hydrothermal reaction at 180 DEG C for 18 hours, washing with absolute ethyl alcohol and deionized water, and carrying out vacuum drying at 60 DEG C to obtain a CoSe2 material; and (3) the molar feeding ratio of CoCl2. 6H2O to NiCl2. 6H2O is adjusted, so that the nickel / cobalt ratio x is 0.25, 0.50 or 0.75, and materials with different components, namely Co < 0.75 > Ni < 0.25 > Se < 2 >, Co < 0.50 > Ni < 0.50 > Se < 2 > and Co < 0.25 > Ni < 0.75 > Se < 2 >, are prepared. The series of materials are applied to ethylene glycol oxidation under the alkaline condition, the catalytic performance of Co < 0.50 > Ni < 0.50 > Se < 2 > is optimal, the current density reaches 111 mA cm <-2 > under the electric potential of 1.6 V vs.RHE, the total Faraday efficiency reaches up to 91.4%, and the application prospect in the field of PET plastic recovery is wide.

The application relates to a high-cobalt rare earth permanent magnet material and a preparation method thereof, and belongs to the technical field of rare earth permanent magnet materials. The high-cobalt rare earth permanent magnet material comprises the following components in percentage by mass: RE a Co b M c TM e Fe 100‑a‑b‑c‑d B d , 28<=a<=35, 15<=b<=30, 0.5<=c<=1.2, 0.95<=d<=1.2, 0.2<=e<=3; RE is one or a combination of Pr, Nd, La, Ce, Y, Gd, Tb, Dy and Ho; M is one or a combination of Cu and Al; TM is one or a combination of Cr, Nb, Zr, Ga, Ti, Zn, V, Mo and Mn; the microstructure comprises a main phase and a grain boundary phase, the Co-rich phase in the grain boundary phase accounts for less than or equal to 5% of the total volume fraction of the grain boundary phase; and the Co:M mass percentage in the Co-rich phase is 5:1-100:1. The microstructure of the magnet can be optimized, and the coercivity of the magnet is improved.

The invention discloses a neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and a preparation method thereof, and relates to the technical field of neodymium-iron-boron magnet preparation, and the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet comprises the following preparation raw materials: 170-175 kg of PrNd (praseodymium-neodymium alloy), 25-30 kg of BFe (iron white copper), 1-5 kg of Co (cobalt), 0.1-2 kg of Cu (copper), 1-5 kg of Zr (zirconium), 0.1-1 kg of Ga (gallium) and 380-420 kg of Fe (iron). According to the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and the preparation method thereof, the 54H sintered neodymium-iron-boron magnet is prepared through a double-alloy technology with neodymium, iron and gallium as auxiliary alloy without adding dysprosium, terbium and other scarce type heavy rare earth elements, and performance optimization and cost optimization of the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet are achieved.

The invention relates to the technical field of grinding fluid, in particular to wafer polishing fluid containing graphene nanosheets and a preparation process of the wafer polishing fluid. A graphene modified abrasive; an oxidant; a complexing agent; a metal corrosion inhibitor; a pH adjusting agent; a dispersion stabilizer; an interface modifier; a defect repairing agent; a corrosion inhibition synergist; a wettability modifier; an anti-agglomeration agent; and deionized water. Through introduction of the graphene modified abrasive and multi-component collaborative design, the graphene modified abrasive polishing solution has high polishing efficiency, low corrosion rate and excellent dispersion stability, compared with a traditional polishing solution, the Cu / Co corrosion rate is reduced by 60% or above, the copper surface roughness Ra is smaller than or equal to 0.5 nm, polished wafers do not have obvious micro-scratches, and the lubricating property and the mechanical grinding property of graphene nanosheets are coordinated, so that the mechanical polishing effect is good. The copper / cobalt removal rate ratio is stabilized at 1: 1 + / -0.1, and the defects of dished pits and corrosion pits are effectively avoided.

The invention provides a treatment method for synergistically enhancing the comprehensive performance of a neodymium-iron-boron magnet, and belongs to the technical field of magnetic materials. According to the method, a heavy rare earth layer and a corrosion-resistant metal layer such as copper, nickel and cobalt for promoting grain boundary diffusion of heavy rare earth are respectively deposited on the surface of the neodymium-iron-boron magnet by adopting a multi-layer electroplating method, the coercivity of the neodymium-iron-boron magnet is enhanced through grain boundary diffusion, and the corrosion resistance of the magnet is enhanced through a nickel-cobalt coating. The treatment method comprises the following steps: carrying out electrochemical deposition on the neodymium-iron-boron magnet in a heavy rare earth metal plating solution, and then respectively electroplating a copper plating layer and a nickel-cobalt plating layer to obtain a heavy rare earth-containing plating layer with strong corrosion resistance and good plating film binding force; the neodymium-iron-boron magnet containing the heavy rare earth coating is subjected to heat treatment, and the coercive force of the magnet is improved through heavy rare earth grain boundary diffusion. The neodymium iron boron grain boundary diffusion process and the surface corrosion prevention process are subjected to integrated treatment, the technological process of high-performance neodymium iron boron industrial preparation is shortened, and the coercive force and the corrosion resistance of the magnet are comprehensively enhanced.

The invention relates to the technical field of diamond saw blades, and provides a diamond saw blade and a preparation method thereof. The diamond saw blade comprises a disc base body and a tool bit fixed to the periphery of the disc base body, and the tool bit is prepared from, by weight, 30-45 parts of iron powder, 15-25 parts of copper powder, 8-12 parts of nickel powder, 8-15 parts of cobalt powder, 3-5 parts of tin powder, 2-5 parts of molybdenum powder, 1-3 parts of silicon-boron alloy powder, 0.5-2 parts of tungsten carbide powder, 20-25 parts of diamond particles and 0.05-0.1 part of liquid paraffin. According to the diamond saw blade provided by the invention, the scientificity and the accuracy of proportion matching of all the components in the raw material formula of the tool bit are improved, the stability of the sintering process is improved, and the condition that the hardness and the toughness of the tool bit are difficult to achieve the optimal balance is improved.

The invention discloses a cerium-zirconium-based high-entropy oxide as well as a preparation method and application thereof. According to the cerium-zirconium-based high-entropy oxide, cerium and zirconium serve as main bodies, and meanwhile rare earth elements (lanthanum, praseodymium, neodymium and samarium) and transition metal elements (manganese, iron, cobalt, nickel, copper and zinc) are introduced to form a high-entropy solid solution with the equal molar ratio and containing 3-8 kinds of metal. In the cerium-zirconium-based high-entropy oxide, the cerium element and the zirconium element respectively account for 20%-40% of the total amount, and the other elements are respectively 10%-30% in an equimolar ratio. The cerium-zirconium-based high-entropy oxide catalyst prepared by the invention has excellent oxygen storage and release capacity and CO oxidation capacity, and the CO complete conversion temperature is 181 DEG C. The method adopts a simple coprecipitation process, is mild in condition and low in cost, and is suitable for large-scale application in the field of tail gas purification.

The invention provides an impurity and oil removal method for a laterite-nickel ore hydrometallurgy filter stick. The impurity and oil removal method comprises the following steps: dynamically cleaning a to-be-treated filter stick by adopting a first cleaning solution so as to remove oil stains on the surface of the filter stick; the first cleaning solution comprises an alkaline reagent and a surfactant; dynamically cleaning the oil-removed filter stick by adopting a second cleaning solution so as to remove metal impurities on the surface of the filter stick; the second cleaning solution comprises an acidic reagent and fluoride. According to the method, a step-by-step strategy of oil removal and impurity removal is adopted, the alkaline reagent and the surfactant cooperate with each other, oil stains on the surface of the filter stick can be efficiently stripped, and a channel is opened for subsequent impurity removal; the acidic reagent and the fluoride cooperate with each other, nickel, cobalt, lead and other impurities on the surface of the filter stick can be efficiently removed, fluorine ions and the metal ions can form a water-soluble complex, the problem of impurity metal residues is thoroughly solved, and deep regeneration of the filter stick is achieved. The strategy is excellent in oil and impurity removal effect and regeneration performance.

The invention relates to a low-stress copper-cobalt-nickel-silicon alloy and a preparation method and application thereof. The low-stress copper-cobalt-nickel-silicon alloy comprises 0.5 wt%-1.0 wt% of Ni, 0.005 wt%-0.4 wt% of Co, 0.1 wt%-0.3 wt% of Si, 0.05 wt%-0.4 wt% of Sn, 0.01 wt%-0.02 wt% of P, 0.05 wt%-0.3 wt% of Zn and the balance Cu and inevitable trace impurities. The preparation method of the low-stress copper-cobalt-nickel-silicon alloy comprises the steps of burdening, smelting, casting, hot rolling, rough rolling, primary annealing, intermediate rolling, aging heat treatment, finished product rolling and secondary annealing. The preparation method comprises the following steps: proportioning and smelting according to the mass percent of each element of the copper alloy; the aging heat treatment is stepped aging heat treatment, heating is conducted to 200-350 DEG C, heat preservation is conducted for 1-2 h, then heating is conducted to 400-500 DEG C, and heat preservation is conducted for 10-12 h.

The invention provides a high-wear-resistance and corrosion-resistance valve ball valve seat and a preparation method thereof, and belongs to the technical field of alloy materials. The valve ball and valve seat comprises, by mass, 70%-85% of tungsten carbide, 5%-23% of cobalt, 2%-10% of nickel, 5%-10% of composite reinforced particles and 0.5%-2% of microelements. The composite reinforced particle comprises a core, a transition layer and a shell layer, the core comprises a high-entropy carbide solid solution, the transition layer is a carbide layer, and the shell layer comprises a nano composite structure layer. According to the high-abrasion-resistance and corrosion-resistance valve ball valve seat, through the synergistic effect of all the components, the defects that a traditional valve ball valve seat is prone to being abraded and damaged are overcome, in the application of components such as a valve ball and a valve seat in oil exploitation equipment, the high-abrasion-resistance and corrosion-resistance valve ball valve seat can better adapt to severe exploitation conditions, the service life of the components is prolonged, and the maintenance cost of the equipment is reduced; the method has wide application prospects and remarkable economic benefits.

The invention relates to the technical field of industrial process control, in particular to a multi-extraction-system intelligent collaborative optimization control system for efficient separation of nickel and cobalt. According to the system, the water phase ion concentration, the phase interface state and the organic phase health degree are monitored in real time through the enhanced sensing layer module; through an impurity removal section dynamic optimization control module and a separation section intelligent collaborative optimization module, model prediction control and feed-forward-feedback collaborative adjustment are conducted on an impurity removal section and a separation section respectively, and the saponification rate, the O / A ratio and the pH value are dynamically optimized; the global material balance and cost optimization module constructs an economic digital twinborn model to realize comprehensive optimization of the metal yield and cost in the whole process; the intelligent execution and predictive maintenance early warning module is responsible for accurate execution of control instructions, abnormal early warning and maintenance prompting, and an end-to-end intelligent cooperative closed loop from perception, control, optimization to execution is formed. According to the method, the nickel-cobalt separation efficiency, the product purity and the economical efficiency are remarkably improved.

The invention provides a mechanochemical treatment method of a high-entropy oxide and application of the mechanochemical treatment method. The high-entropy oxide is an oxide composed of five or more transition metals (at least including iron, cobalt, manganese, zinc and nickel elements). The method comprises the following steps: adding the high-entropy oxide into activated carbon powder (including coconut shell powder, walnut shell powder, bamboo charcoal powder and the like) or directly carrying out mechanochemical treatment, carrying out grinding by mainly adopting a grinder or a ball mill in the mechanochemical treatment, controlling grinding conditions to prepare an active super-stable catalyst, and introducing the catalyst and ozone into pollutants of benzotriazole, and benzotriazole can be degraded. The high-entropy oxide subjected to high-temperature roasting is treated by a mechanochemical method to obtain the ozone catalyst with both activity and stability, and the ozone catalyst is used for a long time in an acid environment, less in metal ion leaching, high in catalytic activity and good in ozone catalyst efficiency.

The invention relates to the technical field of hydrometallurgy, in particular to a selective leaching method of alkaline hydroxide ore, which comprises the following steps: fully mixing the alkaline hydroxide ore, an ammonium leaching agent and water to react, and obtaining reaction slurry after the reaction is finished; carrying out solid-liquid separation on the obtained reaction slurry to obtain a leaching solution I and a leaching residue I, and collecting the leaching solution I; s3, mixing the leached residues I with water for slurrying to obtain leached residue slurry; and S4, an acid leaching agent and a reducing agent are added into the leaching residue slurry under the conditions of heating and stirring, solid-liquid separation is conducted after full reaction, second leaching liquid and second leaching residues are obtained, and the second leaching liquid is collected. According to the leaching method, the follow-up impurity removal difficulty can be reduced while the leaching rate of cobalt, manganese and nickel of the alkaline hydroxide ore can be increased.

The application relates to a high-temperature nitriding preparation method of a cobalt-based high-temperature alloy by using nitride dispersion reinforcement, and belongs to the technical field of dispersion reinforcement materials. The cobalt-based high-temperature alloy profile is placed in a high-temperature nitriding furnace, the inner cavity of the nitriding furnace is vacuumized, the cobalt-based high-temperature alloy profile is in a vacuum environment, then argon is filled into the inner cavity of the nitriding furnace, and the temperature is raised to a set temperature of 1100-1200 DEG C; then a mixed gas atmosphere of nitrogen and argon is introduced into the inner cavity of the nitriding furnace, the flow speed is 80-120 mL / min, the cobalt-based high-temperature alloy profile is subjected to nitriding treatment in the furnace for a certain time, and after the high-temperature nitriding process is completed, the temperature is cooled to room temperature at a cooling rate of 20-40 DEG C / min. The method is aimed at cobalt-based high-temperature alloy wire or plate, high-temperature nitriding treatment is carried out in a mixed gas atmosphere of nitrogen and argon, stable nitrides are formed in the alloy organization to play a dispersion reinforcement role, and the problem that the strength of the cobalt-based high-temperature alloy is relatively low can be effectively solved.

The invention relates to an oxygen pressure leaching method of copper and cobalt slag, which comprises the following steps: after mixing the copper and cobalt slag to be treated into pulp, grinding the pulp to obtain ore pulp; after the ore pulp and concentrated sulfuric acid are mixed and react, mixed slurry is obtained; and after oxygen pressure leaching is conducted on the mixed slurry, solid-liquid separation is conducted, and oxygen pressure leaching liquid and oxygen pressure leaching residues are obtained. According to the method, the ore pulp is treated with the concentrated sulfuric acid firstly, then oxygen pressure leaching is conducted, the cobalt leaching rate can be effectively increased, and the iron leaching rate can be reduced.

The invention provides a nickel-based superalloy with high cobalt and gamma'content and a preparation method and application thereof, and belongs to the technical field of superalloy additive manufacturing. The invention provides spherical nickel-based high-temperature alloy powder which comprises the following components in percentage by mass: 20 to 30 percent of Co, 8 to 10 percent of Cr, 4 to 7 percent of Al + Ti, 14 to 16 percent of W + Mo + Ta, 0 to 3.5 percent of Nb, 0.001 to 0.015 percent of B, 0.05 to 0.1 percent of C and the balance of Ni. And the spherical nickel-based superalloy powder serves as a printing raw material, laser additive manufacturing is conducted, then heat treatment is conducted, and the nickel-based superalloy with the high cobalt content and the high gamma'content is obtained. The nickel-based superalloy with high cobalt and gamma'content prepared by the method has excellent high-temperature mechanical properties and excellent printability, and is suitable for direct forming of turbine blades or additive manufacturing repair of damaged turbine blades.

The invention provides a high-entropy Prussian blue material and a preparation method and application thereof, and relates to the technical field of electrochemical material preparation and energy. The preparation method of the high-entropy Prussian blue material comprises the following steps: mixing a cobalt source, a nickel source, a copper source, a manganese source, a zinc source, an organic reducing compound and a first dispersing agent to obtain a first mixture; the molar ratio of the cobalt source to the nickel source to the copper source to the manganese source to the zinc source is 1: 1: 1: 1: 1; mixing the ferricyanide compound with a second dispersing agent to obtain a second mixture; and sequentially stirring and standing the first mixture and the second mixture to obtain the high-entropy Prussian blue material. The high-entropy Prussian blue material prepared by the method is stable in morphology, high in crystallinity and high in chemical stability, and can be applied to the field of electrochemical energy storage.

The application provides a method for efficiently and selectively removing iron and chromium from cobalt-nickel hydroxide raw materials, which can realize the synchronous and deep removal of iron and chromium impurities for high-iron and high-cobalt nickel hydroxide raw materials through the synergistic process of acid leaching, reduction pH adjustment, oxidation precipitation and solid-liquid separation, and the concentrations of iron and chromium in the purified nickel-cobalt liquid are both controlled below 10 mg / L, and the impurity removal precision meets the subsequent high-purity production requirements; the chromium-goethite co-precipitation crystal product is generated in situ in the reaction, and has excellent settling and filtering performance, solving the problems of difficult colloid precipitation and filtration and easy equipment blockage in the traditional method, and the process route is short and the reaction conditions are mild, which can effectively reduce the adsorption entrainment and co-precipitation loss of nickel and cobalt valuable metals, and while realizing the efficient and deep purification of iron and chromium, the excellent solid-liquid separation performance and high main metal recovery rate are also considered, and the method is suitable for the industrial purification treatment of high-iron and high-chromium complex cobalt-nickel raw materials.

A process for producing amines by reductive amination, the process includes introducing a feed stream, the feed stream comprising an amino alcohol and a reducing agent, and hydrogen in a reaction zone of a reactor, and contacting the feed stream with a catalyst in the reaction zone. A hydrogen flow rate into the reaction zone is adjusted, and a product stream comprising ethyleneamines is extracted. The catalyst includes a carrier component selected from alumina, silica, and combinations thereof; and an active component having a first metal, a second metal, and a third metal. The first metal is selected from cobalt, nickel, and copper, the second metal is selected from rhenium, ruthenium, chromium, zinc, sodium, calcium, magnesium, strontium, lithium, potassium, barium, cesium, lanthanum, tungsten, iron, silver, titanium, manganese, aluminum, rhodium, platinum, palladium, iridium, and combinations thereof, and the third metal is niobium.

This invention provides a highly conductive preformed solder sheet, comprising a core layer and a shell layer disposed around the core layer. By embedding the solid flux core layer within the solder alloy layer to form a sandwich-like shape, the flux can be effectively protected from oxidation. There is no need to apply flux before brazing or remove it after brazing, reducing manufacturing costs and the void rate on the welded surface, thus improving the reliability of the solder sheet. The solder alloy shell is composed of tin, silver, copper, indium, cerium, vanadium, lutetium, yttrium, and zinc. The addition of small amounts of rare earth elements lutetium, yttrium, and cerium improves the conductivity and heat transfer of the solder sheet. The addition of indium, vanadium, and zinc increases the melting point of the solder sheet and improves its solidification state. Since no magnetic materials such as lead, iron, cobalt, nickel, or niobium are added, signal interference caused by metals is avoided.