92results about "Rhenium compounds" patented technology

The invention discloses a purification method of crude ammonium perrhenate from copper smelting, which belongs to the technical field of ammonium perrhenate purification. The specific process is: slurrying crude ammonium perrhenate to leach, obtain leaching residue and leachate, and part of the leachate is returned to the acid production adsorption process in an open circuit; slurrying the leaching residue obtained in the previous step, heating and leaching, solid-liquid separation, obtain leaching residue and leachate, and the leaching residue returns to the system; adding oxidant A to the leachate in the previous step, heating and oxidizing, fine filtering, and returning the oxidized residue to the system; freezing and crystallizing the oxidized liquid, solid-liquid separation, obtain primary crystals and liquid after primary crystallization; adding primary crystals to the solution, heating and dissolving, and then controlling the temperature of the filtrate for crystallization, separating the crystals and returning them to dissolve, freezing and crystallizing the liquid after crystallization, and then filtering and washing to obtain secondary crystals and liquid after secondary crystallization, and drying the secondary crystals to obtain the final product ammonium perrhenate. The direct yield of ammonium perrhenate of the invention is greater than 96%, the recovery rate is greater than 99%, and the ammonium perrhenate content is greater than 99.99%.

The invention discloses a rapid preparation method of sodium perrhenate, which comprises the following steps: step 1, dissolving perrhenate in deionized water to obtain a perrhenate solution, and then enabling the perrhenate solution to flow through an exchange column filled with H + type cationic resin to obtain a perrhenic acid solution; the perrhenate is ammonium perrhenate or potassium perrhenate; and 2, adding sodium borohydride into the perrhenic acid solution obtained in the step 1, stirring, and then carrying out centrifugal filtration and drying to obtain a sodium perrhenate solid. According to the preparation method, NH4 < + > or K < + > in perrhenate and H < + > in H < + > type cationic resin are subjected to an exchange reaction to obtain a perrhenic acid solution, then sodium borohydride is added to be subjected to a precipitation reaction with perrhenic acid to obtain a sodium perrhenate solid, the preparation cost of sodium perrhenate is effectively reduced, the preparation period of sodium perrhenate is effectively shortened, and the preparation method is suitable for the technical field of sodium perrhenate synthesis.

The invention relates to a composite gas-sensitive material, a gas sensor and a preparation method and application of the composite gas-sensitive material. The composite gas sensitive material comprises gold modified rhenium disulfide, and the molar ratio of gold to rhenium disulfide is (0.01-0.15): 1. Wherein the gold has excellent catalytic performance and can reduce the activation energy of the reaction and promote the proceeding of the surface chemical reaction. When the gold is combined with rhenium disulfide, the gold can be used as a catalyst to accelerate the adsorption and reaction process of gas molecules on the surface of the material. Meanwhile, gold and rhenium disulfide form a Schottky barrier, and carrier transmission in the rhenium disulfide material can be adjusted due to the existence of the barrier, so that the electrical property of the material is influenced. When gas molecules are adsorbed, the change of the Schottky barrier can cause the rapid change of parameters such as resistance or capacitance of the material, so that rapid response is realized, and the material has important significance in improving the sensing performance of the material.

The invention relates to a method for preparing high-purity ammonium rhenate from crude rhenate. The method specifically comprises the following steps: S1, preparing a crude rhenate solution; s2, preparing a calcium hydroxide suspension; s3, anion impurities in the crude rhenate solution are separated through the calcium hydroxide suspension, and rhenate filtrate is obtained; s4, cation impurities in the rhenate filtrate are adsorbed and separated through cation resin, and a rhenate solution is obtained; s5, treating through a two-chamber bipolar membrane stack electrodialysis system to obtain a perrhenic acid solution; and S6, ammonium rhenate is prepared from ammonium hydroxide in a perrhenic acid solution. According to the method for preparing the high-purity ammonium rhenate from the crude rhenate, the technological process is short and easy to operate, impurities in the crude rhenate form an open circuit, and the flow recovery rate is higher than 99%; the purity of the obtained ammonium rhenate is 99.995% or above, the ammonium rhenate product is stable in quality, waste water and waste gas are not generated, and the method has the advantages of being obvious in environmental protection advantage, free of evaporation and concentration and low in energy consumption.

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 present invention provides a preparation method of a chelating resin and its application in the purification of ammonium perrhenate. By setting the ratio of the oil-phase mixture and the water-phase mixture and precise temperature control, a chelating resin with excellent performance is prepared. This chelating resin not only has a uniform dispersion of the extractant, a strong binding force with the resin, but also is not easily lost. When using this chelating resin to purify ammonium perrhenate solution in a chromatography column, by controlling the solution concentration and flow rate, ammonium perrhenate with a purity greater than 99.99% can be obtained. The chelating resin prepared by the method provided by the present invention can not only improve the purification efficiency and purity of ammonium perrhenate, but also reduce the generation of organic waste liquid, reduce the impact on the environment, and at the same time simplify the resin synthesis and regeneration process, so as to enhance the economy and environmental protection of the ammonium perrhenate refining technology, and provide a high-quality rhenium metal resource guarantee for the development of China's aerospace industry.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a preparation method of a high-purity rhenium strip. The high-purity rhenium strip is prepared by generally taking an ammonium perrhenate crude product as a raw material, and carrying out purification, hydrogen reduction and isostatic pressing to obtain a green body; and sintering the green body to obtain the high-purity rhenium strip. According to the preparation method, an ion exchange method is usually adopted during purification of an ammonium perrhenate crude product, and the problems of high loss of metal rhenium and low content of final rhenium strips exist. The invention discloses a preparation method of a high-purity rhenium strip, which comprises the following steps: firstly, dissolving an ammonium perrhenate crude product into deionized water, and adding an organic solvent to separate out a colloidal substance; then, colloidal substances are separated through centrifugal sedimentation, sedimentation liquid is subjected to evaporative crystallization, and a refined ammonium perrhenate product is obtained; then, the ammonium perrhenate refined product is subjected to hydrogen reduction, and high-purity rhenium powder is obtained; and finally, the high-purity rhenium powder is subjected to cold isostatic pressing and sintering, and the high-purity rhenium strip is obtained. The preparation method has the advantages of low metal rhenium loss and high metal rhenium strip content.

The invention provides a method for extracting rhenium from tungsten-molybdenum-rhenium alloy waste, which comprises the following steps: a three-temperature-zone tubular furnace comprises a high-temperature oxidation zone, a gas phase transition zone and a concentrated deposition zone, the temperature of the high-temperature oxidation zone is 600-900 DEG C, the temperature of the gas phase transition zone is 360-420 DEG C, and the temperature of the concentrated deposition zone is 25-150 DEG C; the three-temperature-zone tubular furnace is connected with oxygen-containing gas, the oxygen-containing gas sequentially passes through a high-temperature oxidation zone, a gas-phase transition zone and a centralized deposition zone, tungsten-molybdenum-rhenium alloy powder is placed in the three-temperature-zone tubular furnace, oxidation reaction is carried out in the high-temperature oxidation zone to obtain rhenium oxide, and the rhenium oxide is placed in the centralized deposition zone through airflow; the rhenium oxide and the tungsten-molybdenum oxide can be effectively separated through the high-temperature oxidation zone and the gas-phase transition zone, the purity of the rhenium oxide is improved, and separation of rhenium, molybdenum and tungsten is effectively 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 relates to an exciton luminescence regulation and control method of a transition metal chalcogenide. The method comprises the following steps: S1, obtaining a two-dimensional layered transition metal chalcogenide; s2, putting the two-dimensional layered transition metal chalcogenide into a sample boat, putting the sample boat into a tubular furnace, putting the tubular furnace into a second temperature zone, and putting S powder, Se powder or Te powder into the first temperature zone of the tubular furnace; s3, annealing treatment is conducted on the two-dimensional layered transition metal chalcogenide, the temperature of the second temperature zone in the tubular furnace is controlled to range from 100 DEG C to 350 DEG C, hydrogen-containing gas is introduced into the tubular furnace, the hydrogen flow ranges from 1 sccm to 8 sccm, and the annealing time ranges from 10 min to 60 min; and S4, keeping the ventilation state, cooling the tubular furnace, and taking out the sample boat to obtain a target product. The method can be used for adjusting the vacancy of the chalcogenide element of the two-dimensional layered transition metal chalcogenide material to obtain the material with high exciton luminescence quality.

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 belongs to the technical field of scattered metal salt purification, and particularly relates to a preparation method of 5N-grade ammonium perrhenate. In the prior art, two methods are generally adopted when 5N-grade ammonium perrhenate is prepared: 1, an ammonium perrhenate crude product is adsorbed and separated by ion exchange resin to obtain 5N-grade ammonium perrhenate; and 2, heating and decomposing the ammonium perrhenate crude product to form rhenium heptoxide, separating and purifying the rhenium heptoxide to obtain 5N-grade rhenium heptoxide, and absorbing the 5N-grade rhenium heptoxide by ammonia water to obtain 5N-grade ammonium perrhenate. Wherein the method 1 is wider in application, but the preparation process has the following problems: 1, the purification process is complicated and the efficiency is low; 2, the loss of ammonium perrhenate is large, and the purification rate is low; the invention discloses a preparation method of 5N-grade ammonium perrhenate. The 5N-grade ammonium perrhenate is prepared by separating and purifying an ammonium perrhenate crude product by adopting macroporous adsorption resin. The preparation method provided by the invention has the characteristics of simple process and high purification rate.

The invention provides a method for removing organic matters in ammonium perrhenate, and particularly relates to the technical field of hydrometallurgy, the method comprises the following steps: adding oxyacid into an ammonium perrhenate solution, and adjusting the pH to acidity to obtain an acidic ammonium perrhenate solution; adding an adsorbate into the acidic ammonium perrhenate solution, stirring and filtering to obtain adsorption slag containing organic matters and a clean ammonium perrhenate solution; adjusting the pH value of the clean ammonium perrhenate solution to be greater than or equal to 5, then carrying out evaporation concentration, cooling crystallization and filtration to obtain ammonium perrhenate crystals, and drying the ammonium perrhenate crystals to obtain an ammonium perrhenate product. According to the method, the oxyacid is added to adjust the pH value to be acidic, under the strong acidic condition, the solubility of organic matter impurities in the solution is remarkably reduced, the impurities are easy to separate out, then the organic matter impurities are adsorbed and removed through the adsorbate, meanwhile, the added oxyacid can also oxidize part of organic matter into gas to be removed, and therefore the content of the organic matter in the solution is reduced. And the removal effect of organic impurities is excellent.

The invention discloses a preparation method of a double perovskite oxide Sr2CrReO6 with high purity. According to the method, strontium carbonate and rhenium heptoxide are taken as raw materials and are subjected to high-temperature reaction under the protection of argon to synthesize an intermediate product; then mixing with chromium sesquioxide and elemental chromium powder, and carrying out high-temperature reaction under a vacuum tube sealing condition to obtain a crude product; and finally, carrying out heat treatment for multiple times in an inert atmosphere, and removing an impurity phase to obtain high-purity Sr2CrReO6 powder. By optimizing the temperature and time of the high-temperature reaction and introducing the heat treatment step, the impurity content is remarkably reduced, and the product purity is improved. According to the compact ceramic prepared from the high-purity powder through a spark plasma sintering technology, the antisite defect is 13.5%, the Curie temperature reaches 610 K, and the saturation magnetization is 0.84 microB / f.u. The method is easy and convenient to operate, low in equipment requirement, high in safety and suitable for laboratory-scale high-quality material preparation.

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.

According to the preparation method of the levextrel resin and the application of the levextrel resin in purification of ammonium rhenate, the levextrel resin with excellent performance is prepared by setting the ratio of the oil-phase mixed solution to the water-phase mixed solution and accurately controlling the temperature. According to the extraction resin, the extraction agent is uniformly dispersed, the binding force with the resin is strong, and the loss is not easy. When the extraction resin is used for purifying an ammonium rhenate solution in a chromatographic column, ammonium rhenate with the purity larger than 99.99% can be obtained by controlling the concentration and the flow speed of the solution. The extraction resin prepared by the method provided by the invention not only can improve the purification efficiency and purity of ammonium rhenate, but also can reduce the generation of organic waste liquid and reduce the influence on the environment, and meanwhile, the synthesis and regeneration process of the resin is simplified, so that the economical efficiency and environmental protection property of an ammonium rhenate refining technology are improved; and a high-quality rhenium metal resource guarantee is provided for the development of the aerospace industry in China.

The invention belongs to the technical field of ammonium rhenate preparation, and particularly relates to an ammonium rhenate extraction mechanism and method. The ammonium rhenate extraction mechanism comprises a kettle body, an inner container, a first rotating rod, a first motor, blades, a partition plate and an interception plate; the ammonium rhenate solution is conveyed into the kettle body, and meanwhile, a first motor drives a first rotating rod and a paddle to rotate, so that the ammonium rhenate solution rotates in the kettle body; the ammonium rhenate solution in the kettle body is cooled, so that ammonium rhenate crystals are separated out of the ammonium rhenate solution; meanwhile, the ammonium rhenate solution rotates, the ammonium rhenate crystals are fully intercepted by the intercepting plate, the ammonium rhenate crystals are attached to the surface of the intercepting plate, then the partition plate is controlled to rotate and turn over, the intercepting plate attached with the ammonium rhenate crystals is driven to rotate into the collecting cavity, and the ammonium rhenate crystals on the surface of the intercepting plate fall into the collecting cavity; the ammonium rhenate crystals attached to the inner wall of the inner container are reduced, the ammonium rhenate crystals can be continuously discharged, the cleaning frequency of workers is reduced, and the production efficiency of the ammonium rhenate crystals is improved.