45results about "Rhenium compounds" patented technology

The invention discloses a surfactant for selectively extracting perrhenate and an application method of the surfactant, the surfactant is a high-selectivity diamino surfactant, and ammonium perrhenate can be separated and enriched by the surfactant. The application method comprises the following steps: adjusting the pH value of a perrhenate-containing leachate, sequentially adding the diamino surfactant and the bubble dispersant, and introducing gas for flotation to obtain a rhenium-rich component; and after the rhenium-rich component is subjected to pH adjustment, a stripping agent is added for stripping, so that ammonium perrhenate with relatively high purity is obtained. The method is simple in technological process, low in operation cost, good in selective separation effect on ammonium perrhenate, capable of effectively overcoming the defects that a traditional solvent extraction process is tedious and high in extraction agent consumption, and suitable for selective separation of ammonium perrhenate under the low-concentration condition.

The application discloses a method for preparing high-purity ammonium rhenate by separating molybdenum and rhenium, which comprises a reaction device and a reaction process. The reaction device is a T-shaped quartz tube, which is divided into four temperature zones. The first, second and third temperature zones are located in the horizontal tube section of the T-shaped quartz tube, and the fourth temperature zone is the vertical tube section of the T-shaped quartz tube. Oxide raw materials containing molybdenum and rhenium are placed in the first temperature zone. Under the oxygen atmosphere, the high-valence molybdenum and rhenium oxides are separated in the horizontal straight tube by the temperature difference between the temperature zones. The gaseous high-valence rhenium is condensed in the fourth temperature zone to generate high-purity rhenium heptoxide. Under the assistance of high-purity ammonia water, high-purity ammonium rhenate is prepared by cooling and crystallization. The quality of the ammonium rhenate can reach 4N or above.

The invention discloses an ammonium rhenate preparation device which comprises a concentration kettle body, a reaction cavity, an interlayer, a rotating part and an outer feeding pipe, and further comprises a multi-position flow mixing structure, the reaction cavity is a round barrel, a plurality of guide ribs are arranged on the inner side of the round barrel, the multi-position flow mixing structure comprises a plurality of downward concave holes formed in the bottom of the interior of the round barrel, and the outer feeding pipe is arranged in the middle of the inner side of the round barrel. A lower concave hole is formed in the top of the circular barrel, a wrapping piece is installed in the lower concave hole and used for wrapping the interior of the circular barrel, a flow mixing frame is installed on the inner side of the guide rib in a sliding mode, the bottom of the flow mixing frame is attached to the wrapping piece, a plurality of upper concave holes are formed in the top of the circular barrel, and upper sealing pieces are installed in the upper concave holes; the outer punching structure comprises a lower hollow cylinder arranged at the lower end of the lower concave hole, and a pressurizing part is installed on the inner side of the lower hollow cylinder. The ammonium rhenate crystallization effect is better within the same time, and the purity of ammonium rhenate obtained after crystallization is higher.

This invention discloses a process for preparing chlorides by reducing chlorination with rare metal oxides, comprising the following steps: S1, in an inert atmosphere, a mixture containing rare metal oxide powder, a reducing agent, and a chloride salt is subjected to a reduction reaction at a predetermined temperature 1; S2, the temperature is lowered to a predetermined temperature 2, oxygen is introduced, and the concentration of oxygen in the mixed gas is adjusted to carry out a chlorination reaction, and the chlorinated product is condensed and collected. This invention eliminates the need for gaseous chlorinating agents such as chlorine or hydrogen chloride, avoiding the leakage risks of liquid chlorine and compressed hydrogen chloride during storage and transportation; the raw materials can be directly rare metal oxides, with a wide range of sources, good process adaptability, and significantly reduced production costs.

The invention discloses resin purification equipment for ammonium perrhenate production and an extraction method thereof, and relates to the field of non-ferrous metal smelting waste residue utilization, the resin purification equipment comprises a support, at least two columns are installed on the support, partition plates are used for separating resin particles, and multiple layers of partition plates are arranged in the height direction in the columns at intervals; the rotating shaft is coaxially and rotationally connected into the column body, the bottom end of the partition plate is rotationally connected with stirring rods used for stirring resin particles, liquid inlet flow at the top end of the column body can drive the rotating shaft to rotate, and the rotating shaft and all the stirring rods are provided with mutually-matched protruding block structures in a staggered mode. The rotating shaft can rise and fall in a reciprocating mode in the height direction while rotating. The rotating mechanism is driven by liquid inlet water flow in the ion exchange process to intermittently disturb the resin bed in each independent chamber, so that resin particles are in full contact with the material liquid in a transient suspension state, and the problems of crushing and shear desorption caused by long-term stirring are effectively avoided.

The invention discloses a preparation method of high-purity ammonium rhenate, which comprises the following steps: adding rhenium-rich slag and water into a high-pressure kettle, uniformly stirring, adding hydrogen peroxide, heating, pressurizing and leaching, precisely filtering after leaching, and standing to obtain a leaching solution; the leachate is treated through a four-stage anion exchange column, the saturated ion exchange column is resolved through high-quality ammonia water, and resolved liquid is purified and enriched ammonium rhenate liquid; and performing high-temperature thermal crystallization on the purified and enriched ammonium rhenate solution under the action of micro-pressure ultrasonic waves, performing centrifugal separation to obtain high-purity ammonium rhenate crystals, and performing high-temperature drying to obtain a high-purity ammonium rhenate product. The method is simple in process, and the prepared product is high in activity, high in crystallization rate and excellent in purity and has high application value.

The invention relates to the technical field of ammonium rhenate purification, and particularly discloses a method for removing Tl impurities in ammonium rhenate. The method specifically comprises the following steps: dissolving ammonium rhenate in deionized water, adding an oxidant, carrying out an oxidation reaction while stirring, filtering, carrying out ion exchange, evaporation and concentration, adding ammonia water / ammonia gas to obtain an ammonium rhenate solution, freezing, crystallizing, and drying to obtain a high-purity ammonium rhenate solid. The method is simple to operate and ingenious in process, the oxidizing agent is added to oxidize and adsorb the Tl, impurities are not introduced, and the Tl which is not easily removed by ion exchange is removed, so that the high-purity ammonium rhenate is obtained. The Tl content is smaller than 0.9 ppm, and the purity of ammonium rhenate is larger than 99.999%.

The invention belongs to the technical field of preparation of scattered metal oxides, and particularly relates to a preparation device and method of 5N-grade rhenium heptoxide and application of the 5N-grade rhenium heptoxide. In the prior art, two methods are generally adopted when 5N-grade rhenium heptoxide is prepared: 1, an ammonium perrhenate crude product is adsorbed and separated by ion exchange resin to obtain 5N-grade ammonium perrhenate, and the 5N-grade ammonium perrhenate is heated and decomposed to form 5N-grade rhenium heptoxide; and 2, heating and decomposing the ammonium perrhenate crude product to form rhenium heptoxide, and separating and purifying the rhenium heptoxide to form 5N-grade rhenium heptoxide. The invention discloses a preparation device, method and application of rhenium heptoxide formed by heating and decomposing an ammonium perrhenate crude product as a raw material and separating and purifying the rhenium heptoxide, and compared with the prior art, the preparation device and method have the advantages of simple technological process, high purification efficiency, stable product quality, low cost and the like. And the purification rate is high.

The invention provides a comprehensive recovery method for valuable metals in smelting waste acid, and relates to the technical field of hydrometallurgy. The method comprises the steps that smelting waste acid is heated and then mixed with a sulfur-containing substance, a sulfur-containing compound is introduced, copper and rhenium in the smelting waste acid are selectively separated, and copper-rich rhenium slag and liquid obtained after copper and rhenium precipitation are obtained; the copper-rich rhenium slag is leached, and a leaching solution is obtained; and extracting the leachate to obtain a loaded organic phase and raffinate, carrying out reverse extraction on the loaded organic phase to obtain ammonium rhenate, and carrying out evaporative crystallization on the raffinate to obtain copper sulfate. Compared with the prior art, the precipitation rate of rhenium can be improved, selective separation of copper, rhenium and arsenic in the waste acid is achieved, the production cost of enterprises is reduced, and the economic benefits of the enterprises are improved.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a preparation method and application of a porous rhenium imprinted composite material. According to the technical scheme, the preparation method comprises the following steps: firstly, synthesizing silicon dioxide with a porous structure in an ionic liquid mixed system, dispersing the porous silicon dioxide in a rhenium-containing ionic liquid aqueous solution, then adding N-vinyl imidazole and 4-chloromethyl styrene, adding azodiisobutyronitrile, heating and stirring at 50-70 DEG C for 10-12 hours, and cooling to room temperature; after the reaction is completed, perrhenate ions used for imprinting are washed away with a diluted hydrochloric acid solution, meanwhile, other reactants which are not polymerized and are left on the surface are washed away, and the porous rhenium imprinting composite material is obtained through drying. When the material is applied to extraction and preparation of ammonium rhenate, the purity of the obtained ammonium rhenate product can reach 99.999% or above, the used reagent is environment-friendly, and obvious social benefits and economic benefits are achieved.

The application relates to a method for preparing high-purity ammonium rhenate from crude rhenate, and the method is specifically performed according to the following steps: S1, preparing a crude rhenate solution; S2, preparing a calcium hydroxide suspension; S3, separating anion impurities in the crude rhenate solution by using the calcium hydroxide suspension, and obtaining a rhenate filtrate; S4, separating cation impurities in the rhenate filtrate by using a cation resin adsorption, and obtaining a rhenate solution; S5, treating the rhenate solution by using a two-chamber bipolar membrane membrane stack electrodialysis system, and obtaining a perrhenic acid solution; and S6, preparing ammonium rhenate from the perrhenic acid solution and ammonia water. The method for preparing high-purity ammonium rhenate from crude rhenate has a short technological process, is easy to operate, and has the advantages that the impurities in the crude rhenate form an open circuit, the recovery rate of the process is higher than 99%, the purity of the obtained ammonium rhenate is higher than 99.995%, the quality of the ammonium rhenate product is stable, no waste water and waste gas are generated, the environmental protection advantage is obvious, evaporation and concentration are not needed, and the energy consumption is low.

The application discloses a method for preparing ammonium rhenate from copper smelting rhenium-rich slag and belongs to the technical field of rare and dispersed metal metallurgy. The method comprises the following steps: mixing the copper smelting rhenium-rich slag with water, adjusting the pH value of the mixed solution to 11-13, adding hydrogen peroxide for oxidation depolymerization reaction to obtain solution I; mixing the solution I with a magnesium salt for a first precipitation reaction, performing solid-liquid separation to obtain filtrate II from which impurities M are removed; mixing the filtrate II with a calcium salt for a second precipitation reaction, performing solid-liquid separation to obtain purified ammonium rhenate solution from which impurities N are removed; and sequentially performing extraction, washing, reverse extraction and crystallization on the purified ammonium rhenate solution to obtain ammonium rhenate products. The method realizes deep removal of impurities and preparation of 4N high-purity products through a five-step coupling process of "chemical pretreatment (oxidation depolymerization + fractional precipitation)-extraction-washing-reverse extraction-crystallization".

The utility model discloses an ammonium rhenate purification and potassium removal device which comprises an exchange column shell, cover plates are installed at the upper end and the lower end of the exchange column shell through bolts, multi-interface connecting mechanisms are arranged at the ends, away from each other, of the upper cover plate and the lower cover plate, and a plurality of columnar storage boxes are arranged in the exchange column shell; the utility model belongs to the technical field of ammonium rhenate purification, and aims to solve the problems that if a plurality of interfaces are arranged in the prior art, the unused interfaces need to be sealed by customizing a sealing cover or a sealing element, and the sealing cover or the sealing element is easy to lose during subsequent switching. The pipeline connector has the advantages that the pipeline connector can be fixedly connected with pipelines of various specifications, the connecting range is wide, practicability is high, meanwhile, different connectors do not need to be sealed through corresponding sealing covers or sealing pieces, when the pipeline of another specification is switched to be connected, the sealing cover or the sealing piece does not need to be found, and operation is convenient. And the accident that the sealing cover or the sealing element is lost and cannot be found is avoided.

The invention provides a method for recovering ammonium perrhenate and removing molybdenum from molybdenum ore, which comprises the following steps: carrying out water heating saturation primary redissolution on a high-molybdenum ammonium perrhenate product needing molybdenum reduction to obtain a high-molybdenum liquid; then hydrogen peroxide and ammonia water are added, the temperature is kept at 70-75 DEG C, the pH value of the high-molybdenum liquid is larger than 10, then nanoscale cross-flow filtration is conducted, and concentrated liquid is returned to be redissolved; performing freezing crystallization on the filtered high-molybdenum clear liquid at the final temperature of 0-3 DEG C, and returning crystallization mother liquor for re-dissolution; carrying out negative pressure suction filtration on the obtained primary crystallized ammonium perrhenate by using 200-mesh filter cloth to obtain a primary crystallized ammonium perrhenate filter cake; and carrying out water saturation secondary redissolution on the obtained primary crystallized ammonium perrhenate filter cake, then adding ammonia water, carrying out freezing crystallization, and carrying out suction filtration and drying after crystallization to obtain a low-molybdenum ammonium perrhenate product. According to the method, two redissolution separation stages are set in the molybdenum and rhenium separation process, and the molybdenum removal efficiency is further guaranteed.

The invention belongs to the technical field of scattered metal, and particularly relates to a preparation method of 5N-grade high-purity rhenium powder. In the prior art, industrial-grade ammonium perrhenate is generally used as a raw material, and 5N-grade high-purity ammonium perrhenate is obtained through ion exchange resin adsorption separation. And the 5N-grade high-purity ammonium perrhenate is subjected to hydrogen reduction to prepare the 5N-grade high-purity rhenium powder. The preparation method has the problems of complex purification process, low purification efficiency and low purification rate. The invention discloses a preparation method of 5N-grade high-purity rhenium powder, which is characterized in that industrial ammonium perrhenate with the content of 99.9% is subjected to precision filtration and two times of recrystallization to prepare 5N-grade high-purity ammonium perrhenate. And reducing the 5N-grade high-purity ammonium perrhenate with hydrogen to prepare the 5N-grade high-purity rhenium powder. The preparation method of the 5N-grade high-purity rhenium powder has the advantages of being simple in preparation process, high in purification efficiency and high in purification rate.

The invention provides a method for super-cleanly transferring a two-dimensional material. The method comprises the following steps: adding water drops to the surface of a target substrate, then covering the water drops of the target substrate with a growth substrate on which a two-dimensional material grows, and pressing the water drops into a water film by two layers of substrates to form a sandwich structure; cooling the sandwich structure to convert the water film into an ice layer; stripping the growth substrate, and leaving the ice layer attached with the two-dimensional material on the target substrate; the ice layer is removed, and transfer of the two-dimensional material to the target substrate is completed; wherein the method further comprises the operation of preheating the growth substrate before dropwise adding water and / or the operation of preheating the obtained sandwich structure before cooling. The transfer method provided by the invention can realize pollution-free, rapid, smooth and complete transfer of the two-dimensional material.

The invention relates to the technical field of wet smelting of non-ferrous metals, in particular to a method for wet separation of molybdenum and rhenium and enrichment extraction of rhenium in a high-acid solution, which comprises the following steps: adding a phosphorus source into a raw material solution containing molybdenum and rhenium, and adjusting the acidity to a high-acid environment with the hydrogen ion concentration greater than or equal to 1mol / L; extracting rhenium from the acidity-adjusted raw material liquid containing molybdenum and rhenium by using an amine extraction system to obtain a rhenium-rich organic phase; the amine extraction system comprises an amine extraction agent and a modifier; and carrying out reverse extraction on the rhenium-rich organic phase to obtain a rhenium product. According to the method, the phosphorus source is added into the raw material liquid containing molybdenum and rhenium, so that phosphate ions are hydrolyzed from the phosphorus source, molybdenum can be effectively prevented from being extracted by an extraction system, the selectivity of the extraction system to rhenium is greatly improved, and the recovery rate of rhenium and the molybdenum and rhenium separation effect are improved; the problems that in the prior art, an extraction system is difficult to adapt to molybdenum-rhenium separation under the high acid concentration, the rhenium recovery rate is low, the rhenium-molybdenum separation effect is poor, and a high-acid-concentration solution cannot be treated are solved.

The present application relates to the field of metallurgical materials, and particularly relates to a purification method of ammonium rhenate. The method specifically comprises the following steps: taking impure ammonium rhenate as raw material, adding the raw material and ultrapure water into a reaction container, obtaining an ammonium rhenate solution with a certain concentration after complete dissolution, and reserving; the dissolved ammonium rhenate solution is subjected to adsorption and impurity removal through an adsorption tube filled with attapulgite, the ammonium rhenate after adsorption and impurity removal is precisely filtered, then the ammonium rhenate filtrate is subjected to freeze centrifugal crystallization to obtain mixed slurry; the mixed slurry is filtered to obtain pre-crystallization powder and ammonium rhenate refined filtrate; the obtained ammonium rhenate refined filtrate is subjected to low-temperature slow recrystallization again, the recrystallization slurry is filtered, and 5N ammonium rhenate is obtained after the recrystallization is washed with ultrapure water and freeze-dried, and the remaining ammonium rhenate filtrate is evaporated and concentrated to a certain concentration, then subjected to adsorption and impurity removal again, and reused.

The invention provides a preparation method and application of a samarium-cobalt-based composite wave-absorbing material, by utilizing the method, tetraethyl silicate and ammonia water are added during ball milling to obtain samarium cobalt coated with silicon dioxide, rhenium sulfide grows on the surface of the samarium cobalt coated with the silicon dioxide through a hydrothermal method to obtain Sm2Co17 / Co9S8-coated SiO2-coated ReS2, and after silicon dioxide is coated and sulfide is introduced, the Sm2Co17 / Co9S8-coated SiO2-coated ReS2 is prepared into the samarium-cobalt-based composite wave-absorbing material. The electromagnetic parameters of the samarium cobalt are adjusted, the dielectric property is improved, and the samarium cobalt coated with the silicon dioxide can better prevent the vulcanization phenomenon of the samarium cobalt during growth of rhenium sulfide. Compared with traditional samarium cobalt, the material synthesized by the method has the advantages that the matching thickness is obviously reduced, the effective bandwidth is obviously increased, the minimum reflection loss is also obviously enhanced, and the material has good microwave absorption performance.

The invention relates to metal nanoparticles which comprise a metal and a capping agent coordinated to the metal, wherein the capping agent is a salt of a cationic compound capable of absorbing visible light. It also relates to semiconductor metal oxide nanoparticles which comprise the metal nanoparticles, to a functionalised material comprising the semiconductor metal oxide nanoparticles, and to a photocatalytic paint which comprises either the semiconductor metal oxide nanoparticles or the functionalised material. The invention also relates to processes for the preparation of all these materials, and to the use of the semiconductor metal oxide nanoparticles or the functionalised material comprising them as biocides; particularly for the treatment or prevention of a viral disease or a bacterial infection; for removing Volatile Organic Compounds (VOCs) from of air and water supplies, and as a photocatalyst for water splitting.

The invention discloses a preparation method of rhenium trioxide and rhenium dioxide, which comprises the following steps of: 1, dissolving ammonium perrhenate in deionized water to prepare an ammonium perrhenate solution, and enabling the ammonium perrhenate solution to flow through an exchange column filled with H + type C160 cationic resin to obtain a perrhenic acid solution; 2, ammonium perrhenate is subjected to hydrogen reduction, and active rhenium powder is obtained; 3, mixing and drying the perrhenic acid solution and the active rhenium powder to obtain a rhenium oxide precursor; and 4, thermally decomposing the rhenium oxide precursor in an inert atmosphere to obtain a rhenium trioxide or rhenium dioxide solid. According to the method, ammonium perrhenate is subjected to cationic resin ion exchange and hydrogen reduction treatment to obtain a perrhenic acid solution and active rhenium powder respectively, then the perrhenic acid solution and the active rhenium powder are evenly mixed, dried and subjected to thermal decomposition, and cubic-crystal-form rhenium trioxide or orthorhombic-crystal-form rhenium dioxide solids are obtained; the crystal form of rhenium dioxide is effectively controlled, the raw materials are easier to obtain and store, the difficulty of the preparation process is reduced, and the method is suitable for large-scale production.

The application discloses a preparation method of rare metal chloride, which comprises the following steps: in an inert atmosphere, a mixture containing rare metal powder, a chlorine salt and an auxiliary material is heated to a predetermined temperature, oxygen is introduced, the concentration of oxygen in the mixed gas is adjusted, a chlorination reaction is carried out, and a chlorination product is condensed and collected to obtain the rare metal chloride. The application avoids the safety production risk caused by the use of chlorine or hydrogen chloride in the traditional production, and the production process avoids the leakage risk of liquid chlorine and compressed hydrogen chloride in the storage and transportation process. Since the reaction process is a double decomposition reaction, the reaction rate is controllable, the reaction does not have obvious heat release, and is safe and reliable. The chlorine content in the production tail gas is extremely low, and the environmental pollution problem caused by a large amount of chlorine-containing tail gas in the traditional chlorination process is avoided.

The invention provides a method for preparing 6N-grade ammonium rhenate, and relates to the technical field of ammonium rhenate purification. The chelate resin is treated with ammonia water, and treated chelate resin is obtained; sequentially introducing the ammonium rhenate solution into the treated chelating resin, the strongly acidic macroporous cationic resin and the strongly acidic gel type cationic resin for ion exchange to obtain a high-purity ammonium rhenate solution; the high-purity ammonium rhenate solution is subjected to evaporation concentration and freezing crystallization, and 6N ammonium rhenate is prepared; wherein the main body structure of the chelating resin comprises a crosslinked polystyrene / styrene-divinylbenzene copolymer. The preparation method is simple and convenient to operate and high in practicability.

The application discloses a preparation device for ammonium rhenate, which comprises a concentration cauldron body, a reaction cavity, a sandwich, a rotating part, an outer feeding pipe, a multi-position mixed flow structure, a circular cylinder body, a plurality of guide ribs arranged on the inner side of the circular cylinder body, a plurality of lower concave holes arranged on the bottom of the circular cylinder body, a wrapping part arranged in the lower concave holes, a mixed flow frame slidingly arranged on the inner side of the guide ribs, a lower empty cylinder arranged at the lower end of the lower concave hole, a booster arranged on the inner side of the lower empty cylinder, a plurality of upper concave holes arranged on the top of the circular cylinder body, and an upper closing part arranged in the upper concave holes.

The invention discloses equipment for preparing high-purity ammonium rhenate by directly purifying a low-concentration rhenium solution. The equipment comprises a feeding unit, a resin pretreatment unit, an adsorption unit, a directional impurity removal unit, a sectional elution unit, a circulating enrichment unit and an evaporative crystallization unit which are controlled by a control unit in a centralized manner, a resin pretreatment unit with an annular distributor is arranged at the top of the adsorption column, uniform backwashing and ammonium activation are realized, impurities are selectively removed through a directional impurity removal unit after adsorption, and low-concentration eluent flows back to the adsorption column for secondary adsorption and enrichment through a sectional elution and circulating enrichment unit; feeding the high-concentration rhenium-rich liquid into an evaporative crystallization unit, and returning mother liquid to a system for circulation; therefore, through integrated integration and full-process automatic control, efficient adsorption, deep impurity removal, internal circulation concentration and high-purity crystallization of low-concentration rhenium are achieved, and the technical problems that in a traditional process, the adsorption rate is low, the product purity is insufficient, high-energy-consumption external concentration equipment is depended on, and operation is complex are solved.

A one-step salt-assisted general synthetic methodology for the controlled phase transformation of various types of 2H-phase transition metal dichalcogenides (2H-TMDs), yielding large-scale metastable 1T′-phase transition metal dichalcogenides (1T′-TMDs), including WS2, WSe2, MoS2, and MoSe2 is described. By tuning the reaction conditions, alloyed 1T′-TMDs such as WS2xSe2(1−x) and MoS2xSe2(1−x) are also obtained. Commercially-available metal salts such as K2C2O4·H2O, Na2C2O4, K2CO3, Na2CO3, Cs2CO3, Rb2CO3, KHCO3, and NaHCO3, are demonstrated to be effective for the controlled phase transformation at elevated temperatures in a reducing atmosphere. The technique may be extended to the phase engineering of other materials with various polymorphs.

The invention discloses an ultra-small-size ruthenium-rhenium-oxygen solid solution particle water electrolysis catalyst and a preparation method thereof. Ruthenium-rhenium alloy grows on the surface of rhenium trioxide through a solvothermal method to obtain a ruthenium-rhenium-oxygen solid solution, XPS characterization proves that the product contains multivalent ruthenium and rhenium components and a rhenium trioxide carrier, the particle size of ruthenium-rhenium nanoparticles on the carrier is 1-3 nm, and the utilization rate of ruthenium is greatly increased. An electrochemical test shows that the mass activity, the stability and the cost performance of the catalyst in a pure seawater electrolytic reaction are higher than those of commercial platinum. The catalyst has great significance on commercialization of a direct seawater electrolysis hydrogen production technology.

The invention discloses a device and method for preparing rhenium hexafluoride. A reactor is of a vertical cylindrical structure, an upper-layer mesh cage structure and a lower-layer mesh cage structure are arranged in the reactor and used for being filled with raw material metal rhenium, the aperture of the upper-layer mesh cage is larger than that of the lower-layer mesh cage, a heating mechanism is arranged outside the reactor, and a gas inlet pipe and a gas distributor are arranged at the bottom of the reactor. A gas outlet pipe at the top of the reactor is sequentially connected with the first-stage freezing collector, the second-stage freezing collector and the washing tank; a communicating pipeline is arranged between the top and the bottom of the reactor. The preparation method comprises the following steps: (1) drying metal rhenium and then placing the metal rhenium on an upper-layer mesh cage and a lower-layer mesh cage; (2) introducing nitrogen / nitrogen trifluoride mixed gas into the reactor, raising the temperature to 300-350 DEG C, and maintaining the temperature for 4-6 hours; and (3) condensing and collecting the gas generated by the reaction to obtain rhenium hexafluoride. The reaction conditions are controllable, the process is simple, and efficient and oriented conversion of ReF6 is realized.

The method for manufacturing of mixtures of rhenates(VII) of selected metals i.e. copper and / or nickel, and / or cobalt characterized in that the nickel(II) oxide of grain size from 10 to 50 nm and / or cobalt(II) oxide is added to rhenic(VII) acid of rhenium concentration ≥50 g / dm3, neutralization is carried out at 75-85°C, until pH 0.7-1.5 is achieved, non-dissolved residue is filtered and washed regularly, using 0.005-0.020 dm3 of isopropyl alcohol per each 1g, while non-dissolved residue is used for neutralization of fresh portion of rhenic(VII) acid, in such amounts that the mass of non-dissolved residue does not exceed 75%, while filtrate from filtration of non-dissolved residue is treated with copper(II) oxide, until pH 3.8-4.3 is achieved, the neutralization is carried out at 75-85°C, for 60 minutes, and non-dissolved copper residue is filtered and washed regularly using 0.005-0.020 dm3 of isopropyl alcohol per each 1 g of non-dissolved copper residue, non-dissolved copper residue from washing by isopropyl alcohol is used in neutralization of rhenic(VII) acid, after prior neutralization with nickel(II) oxide and / or cobalt(II) oxide in such amount that mass of non-dissolved copper residue does not exceed 50%, and filtrate from filtration of non-dissolved copper residue is evaporated until dry, at temperature not exceeding 85°C, thus obtained residue is dried, first at ≥150°C, for 3-6 h, then ≥190°C, for 6-12 h, until homogenous, non-hygroscopic mixture of rhenates(VII) containing ≥10% of copper, and / or nickel, and / or cobalt in total, is obtained.

The invention relates to the technical field of fluorine chemical industry, in particular to a synthesis method of rhenium hexafluoride. The method comprises the following steps: S1, preheating fluorine-nitrogen mixed gas to 50-100 DEG C in a first temperature zone; s2, introducing the preheated fluorine-nitrogen mixed gas into a second temperature zone to react with rhenium metal to generate mixed gas containing rhenium hexafluoride, wherein the temperature of the second temperature zone is 120-180 DEG C; s3, mixed gas containing rhenium hexafluoride is introduced into a third temperature zone and continues to react with rhenium metal, and the temperature of the third temperature zone ranges from 300 DEG C to 450 DEG C; s4, introducing the gas obtained in the step S3 into a fourth temperature zone, and controlling the temperature of the fourth temperature zone to be 200-300 DEG C, and S5, carrying out low-temperature collection on the gas generated in the step S4 through a cold trap to obtain the high-purity rhenium hexafluoride. Through temperature control in multiple areas, the impurity content is reduced, and the product purity is improved.