13 results about "Ammonium perrhenate" 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.

This invention belongs to the field of metal ingot preparation technology, specifically relating to a high-purity rhenium ingot and its preparation method. Using ammonium perrhenate solution as raw material, this invention directly generates elemental rhenium and rhenium oxides of different valence states through electrodeposition without complex pretreatment. The mixture is then crushed and fed into a transferred arc hydrogen plasma reaction zone, where the rhenium oxides of different valence states are rapidly reduced to rhenium powder under the high temperature and high energy environment of the hydrogen plasma. The rhenium powder and elemental rhenium fall into a water-cooled copper crucible, where they are continuously heated and melted by the transferred arc hydrogen plasma to form liquid rhenium. Unreacted rhenium oxides continue to be reduced in the liquid rhenium pool to ensure complete reduction. Finally, the liquid rhenium is cooled and solidified to obtain a high-purity rhenium ingot. This invention integrates the reduction and melting processes, resulting in a simple and efficient process that effectively avoids the introduction of impurities. The prepared rhenium ingot has a purity ≥99.99%, high density, and uniform composition, making it widely applicable in high-end fields such as aerospace, nuclear energy, and electronics.

This invention belongs to the field of metallurgical technology, and specifically relates to a method for efficiently extracting rhenium from rhenium-containing waste. The method includes the following steps: pulverizing and sieving the raw material, adding a purification reagent to remove impurities, followed by electrolytic dissolution, evaporating and concentrating the resulting solution, separating it by resin adsorption, eluting with an eluent, purifying by recrystallization, and finally obtaining high-purity rhenium powder by hydrogen reduction. The method provided by this invention effectively removes impurity ions from the waste by introducing a purification reagent, and further utilizes a cation exchange resin to adsorb and separate residual trace metal ions in the solution, thereby avoiding the impact of impurities on the purity of subsequent ammonium perrhenate and rhenium powder. This method has a simple process flow, is highly operable, has a wide range of applications, and has minimal environmental impact, showing promising application prospects.

The invention belongs to the field of powder metallurgy, and particularly discloses a method for preparing nano molybdenum-rhenium alloy powder through liquid-phase in-situ precipitation. According to the method, ammonium heptamolybdate and ammonium perrhenate serve as raw materials and are dissolved in an ammonia water solvent, then a dispersing agent, a complexing agent and a surface active agent are added, the pH is adjusted to be within the acidic range, so that molybdenum-rhenium precursors are rapidly separated out from the solution in situ, and atomic-scale mixed ammonium dimolybdate-ammonium perrhenate mixed crystals are formed. And then low-temperature calcination dehydration is conducted in the argon atmosphere, gradual reduction and alloying of oxides are sequentially achieved through a three-stage hydrogen reduction technology, and finally the nanometer molybdenum-rhenium alloy powder which is uniform in component, good in dispersity and about 160 nm in average particle size is obtained. The method is simple in process, and the prepared powder is small in particle size and concentrated in distribution, has high sintering activity and is suitable for preparing a high-performance molybdenum-rhenium alloy material.

The application discloses a rhenium disulfide-nitrogen doped porous carbon composite material and a preparation method and application thereof. The preparation method of the rhenium disulfide-nitrogen doped porous carbon composite material comprises the following steps: (1) adding a rhenium source, thiourea and sodium chloride into a folic acid solution and uniformly mixing to obtain a mixed solution, wherein the rhenium source is at least one of ammonium perrhenate and potassium perrhenate; (2) performing freeze drying on the mixed solution to obtain a mixed dry powder; (3) performing heat treatment and sulfuration treatment on the mixed dry powder under an inert atmosphere and at a certain temperature; and (4) performing washing and freeze drying on the product obtained in the step (3) to obtain the rhenium disulfide-nitrogen doped porous carbon composite material. The rhenium disulfide-nitrogen doped porous carbon composite material prepared by the method has good conductivity and low volume expansion effect, and is not prone to agglomeration or accumulation.

This invention discloses a combined pyrometallurgical-hydrometallurgical cascade separation method for arsenic-containing sludge from copper smelting, relating to the field of solid waste treatment technology. The method first involves low-temperature roasting of the arsenic-containing sludge at 300-600℃ in a reducing atmosphere to achieve preferential volatilization and recovery of arsenic, while copper and rhenium are retained in the roasted sludge. Next, the roasted sludge is subjected to pressure oxidative leaching, with copper and rhenium entering the leachate, and sulfur being enriched and recovered as elemental. Subsequently, arsenic is precipitated as stable arsenic crystals through ternary coupling control of redox potential, pH, and temperature. After deep removal of residual arsenic using barium / lead salts, rhenium is extracted using a co-extraction system to prepare ammonium perrhenate. Finally, copper is recovered from the raffinate by displacement or electrodeposition. This method can efficiently separate arsenic, sulfur, copper, and rhenium, with a sulfur recovery rate ≥92%, arsenic resource recovery rate ≥99%, rhenium recovery rate ≥92%, copper recovery rate ≥95%, solid waste reduction ≥80%, and no secondary pollution. It is suitable for the resource-based treatment of arsenic-containing sludge from copper smelting.

This invention discloses a method for recovering tungsten and rhenium from tungsten-rhenium alloy waste, belonging to the field of waste metal recycling technology. The method includes: leaching pretreated tungsten-rhenium alloy waste by heating and stirring with a mixed solution of dilute hydrochloric acid and hydrogen peroxide, converting tungsten and rhenium into tungstate ions and perrhenate ions respectively into the solution; then, rapid acidification by quantitatively adding concentrated hydrochloric acid, causing tungsten to precipitate as crystalline tungstic acid; filtering to obtain a crystalline tungstic acid filter cake and a rhenium-containing filtrate; adsorbing the rhenium-containing filtrate through an anion exchange resin to load perrhenate ions onto the resin; subsequently eluting with an ammonia solution to obtain an ammonium perrhenate solution; evaporating, concentrating, and crystallizing to obtain ammonium perrhenate crystals; simultaneously washing and drying the tungstic acid filter cake to obtain the tungstic acid product. This invention features a simple process flow, thorough tungsten-rhenium separation, high recovery rate, is green and economical, and can obtain high-purity tungsten and rhenium products.

This invention discloses a method for preparing 4N ammonium permanganate from low-concentration rhenium-containing waste acid, which is divided into a crude refining stage and a refining stage. The crude refining stage includes a rhenium precipitation process, a leaching process, a hydrolysis process, an acidification process, an extraction process, a back-extraction process, and a crystallization process. The refining stage includes a crude ammonium permanganate dissolution process, an ion exchange process, an extraction process, a back-extraction process, a crystallization process, and a nitration-recrystallization process, ultimately obtaining ammonium permanganate with a purity of 99.99%. In the crude refining stage, this invention first prepares 4N ammonium permanganate from low-concentration rhenium-containing waste acid. Rhenium is efficiently and selectively enriched in concentrated waste acid to obtain a 1% grade rhenium precipitate. Then, a weak oxidation leaching process is used to remove impurities from the precipitate, followed by calcium hydroxide hydrolysis, acidification, high-efficiency extraction, back-extraction, and crystallization to obtain a crude ammonium perrhenate product with a grade of ≥99%. In the refining stage, the crude ammonium perrhenate is dissolved a second time, and a resin ion exchange, extraction, back-extraction, and crystallization process is used to obtain a refined ammonium perrhenate with a grade of ≥99.9%. Finally, a nitration-recrystallization process is used to remove impurities from the refined ammonium perrhenate to achieve a 4N grade quality.

The application relates to a small-particle-diameter nano W-Re-Y2O3 alloy powder and a preparation method thereof. The small-particle-diameter nano W-Re-Y2O3 alloy powder comprises 79-94 wt.% of W, 10-20 wt.% of Re and 1-5 wt.% of Y2O3 according to mass percentage. The small-particle-diameter nano W-Re-Y2O3 alloy powder is prepared by a sol-gel method. Specifically, citric acid is dissolved in deionized water, then ammonium metatungstate, ammonium perrhenate and yttrium nitrate are added respectively, and water bath heating and stirring are carried out until a colloid is formed. After the colloid is dried and calcined, a nano oxide powder is obtained. The nano oxide powder is placed in a reaction furnace, and hydrogen reduction is carried out to obtain W-Re-Y2O3 powder. The application realizes the combination of W and Re at an atomic scale by using the sol-gel method, and Y2O3 particles are generated in situ during calcination, so that Y2O3 is uniformly mixed in the powder. The average particle diameter of the prepared alloy powder is about 12 nm, and the reduced powder does not need subsequent treatment. The preparation method is simple, the raw material cost is low, and the method is easy to realize large-scale production.

The application discloses a preparation method of a W-Re alloy with a crystal boundary irradiation damage alleviating characteristic, and belongs to the technical field of alloy materials. The preparation method of the W-Re alloy comprises the following steps: dissolving ammonium metatungstate, ammonium perrhenate and polyethylene glycol in a citric acid aqueous solution, drying and calcining after sol preparation, and obtaining an oxide precursor powder; reducing the oxide precursor powder in an environment containing hydrogen, and then sintering in a vacuum environment to obtain a target product. The application realizes uniform dispersion of W and Re at a molecular level, Re is completely solid-solved in a W matrix and segregation does not occur, compared with pure W under the same irradiation condition, the helium bubble number density and the crystal boundary swelling rate of the W-Re alloy prepared by the application are both reduced, and the crystal boundary irradiation damage is effectively alleviated. The application provides a new technical scheme for the design of the crystal boundary irradiation damage resistance of a nuclear fusion reactor plasma-facing W alloy.

The invention discloses a preparation method of 6N-grade high-purity ammonium perrhenate based on chromatographic separation and directional crystallization. The method aims at solving the technical bottleneck that trace metal impurities similar to rhenium ions in property are difficult to effectively remove to achieve the purity of 6N in a traditional process. The method comprises the following core steps: (1) dissolving and pretreating an industrial-grade ammonium perrhenate raw material; (2) carrying out separation by adopting an ion exchange chromatographic column filled with a chromatographic filler modified by a specific functional group, and realizing accurate separation by utilizing the difference of affinity between different ions and the filler; and (3) introducing a crystallization inducer, and obtaining a high-purity crystal through directional crystallization controlled by programmed cooling and evaporation. According to the method, high selectivity and high efficiency of chromatographic separation are combined with the purification amplification effect of directional crystallization, online mass spectrum monitoring and feedback control are integrated, technological process intelligence and high product purity stability are achieved, and the method is particularly suitable for being used as a high-performance metal rhenium powder raw material and a high-end petrochemical catalyst precursor.

The application discloses a Re-doped Ti4O7 anode and a preparation method thereof, relates to the technical field of electrochemical technology for repairing polluted water bodies, and comprises the following steps: adding an ammonium perrhenate solution into a tetrabutyl titanate solution, adding an ethanol aqueous solution, continuously stirring, and standing to obtain a gel; grinding the gel into a powder after drying, and calcining to obtain Re-doped TiO2; adding the Re-doped TiO2 and carbon black into anhydrous ethanol, dispersing and ball-milling, vacuum drying, and performing carbon reduction treatment to obtain Re-doped Ti4O7; performing discharge plasma sintering on the Re-doped Ti4O7, naturally cooling, and obtaining the Re-doped Ti4O7 anode; adding modified carbon nanotubes into deionized water, ultrasonic dispersing, adding the Re-doped Ti4O7 anode, vacuum impregnating, drying, heat treating, and obtaining a composite Re-doped Ti4O7 anode.

A preparation method of high-temperature hot cathode relates to the technical field of vacuum electron device manufacturing. Ammonium metatungstate, ammonium perrhenate, lanthanum nitrate and calcium nitrate are dissolved in water respectively, and then mixed into a clear solution. The solute is precipitated by water bath heating, dried in an oven, and then reduced in a hydrogen atmosphere to obtain a cathode precursor powder. The cathode precursor powder is sintered in a sintering furnace. During the working process of the cathode, the rare earth oxide can rapidly diffuse to the surface of the cathode, thereby supplementing the evaporation of the surface composition caused by high temperature and ensuring the stable release of electrons during the working process of the cathode. The noble metal rhenium has excellent chemical stability, less surface adsorbed gas, good ion bombardment resistance, good high-temperature mechanical properties, low evaporation rate, high resistivity, and can form a tungsten-rhenium alloy with the cathode matrix after being added, or rhenium-coated tungsten, thereby improving the overall emission performance of the cathode. After the addition of the alkaline earth metal, the evaporation of the active substances on the surface of the cathode can be reduced, and the surface ablation can be reduced, thereby improving the service life of the cathode.