10 results about "Perrhenic acid" patented technology

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 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 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.

The invention discloses a rhenium-copper double-loaded ozone catalyst and a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing aluminum oxide with copper salt, rhenate and a solvent, and standing overnight after vibration treatment; and filtering, collecting filter residues, and roasting to obtain the rhenium-copper double-loaded ozone catalyst. According to the rhenium-copper double-loaded ozone catalyst, activated aluminum oxide serves as a carrier, perrhenate radicals and copper ions serve as main active components, copper can inhibit metal ions from being dissolved out, and the rhenium-copper double-loaded ozone catalyst is prepared through an impregnation and calcination method; copper and rhenium are effectively loaded on porous activated aluminum oxide through high-temperature roasting, and ozone is adsorbed and promoted to be decomposed into hydroxyl free radicals, superoxide free radicals, singlet oxygen and other active oxygen in combination with the reaction activity of copper ions and perrhenate radicals, so that the purposes of effectively degrading organic matters in water and purifying water are achieved.

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.

The invention discloses a magnetic imprinted polymer for separating perrhenate ions as well as a preparation method and application of the magnetic imprinted polymer, and belongs to the field of hydrometallurgy. The method comprises the following steps: firstly, preparing Fe3O4 (at) mSiO2, and then carrying out sulfydryl modification on the Fe3O4 (at) mSiO2 by utilizing 3-mercaptopropyltrimethoxysilane (MPTMS), so as to obtain the Fe3O4 (at) mSiO2 (at) S-H microspheres. Then by taking perrhenic acid radical (ReO4) as template ions, N-vinyl imidazole (NVI) as a functional monomer, N 'N-methylene bisacrylamide (MBA) as a cross-linking agent, benzoin dimethyl ether (DMPA) as a photoinitiator and a mixed solution of water and ethanol as a pore-forming agent, carrying out hydrothermal reaction to obtain a porous polymer; the perrhenate ion magnetic imprinted polymer (ReO4--MIIPs) with high selectivity and high adsorption capacity is prepared by adopting a sulfydryl-alkene click polymerization method. And the rhenium is used as an adsorbent for enriching and recovering rhenium elements in a rhenium-containing secondary resource solution, so that the separation effect and the recovery efficiency of rhenium are remarkably improved. Compared with a traditional perrhenic acid radical ion imprinting material, the magnetic ion imprinting polymer prepared by combining an ion imprinting technology with a magnetic separation technology is good in stability, high in selectivity, large in adsorption capacity, high in adsorption rate, high in desorption rate and good in regeneration performance; reO4 <-> ions in a rhenium-containing secondary resource solution can be directionally separated, extracted and recycled, and a solution is provided for efficient recovery of secondary resource valuable metals.

The application discloses a cationic polymer material for electric field-assisted adsorption of rhenium and a preparation method and application thereof, and belongs to the technical field of functional polymer adsorbents and electrochemical separation and recovery of rare and dispersed noble metals. The cationic polymer material is cross-linked and constructed through multi-pyridine structural units, and is subjected to methylation and anion exchange treatment, so that a porous polymer structure with high-density cationic sites is formed. Under the action of an applied electric field, the cationic polymer material exists in a suspended and dispersed state in a rhenium-containing solution, the electric field drives directional migration of perrhenate anions, and the perrhenate anions are synergistically adsorbed with the cationic sites in the material through electrostatic attraction and anion exchange, so that efficient enrichment and separation of rhenium are realized. The application avoids the limitation that the adsorption material needs to be fixed on the surface of an electrode, is especially suitable for a low-concentration rhenium-containing solution system, and provides a new technical approach for efficient recovery of rhenium.

The invention provides a substituted imidazole compound, a rhenium extraction agent, a preparation method of the rhenium extraction agent and a method for separating molybdenum and rhenium, and relates to the technical field of hydrometallurgy. The structural formula of the substituted imidazole compound is shown in the specification. The substituted imidazole compound takes an imidazole ring as a molecular skeleton, the imidazole ring is modified through a substitution reaction, a plurality of aromatic ring functional groups are introduced, and the hydrophobic property, steric hindrance and electron density of a rhenium extraction agent are adjusted, so that the rhenium extraction agent is more favorable for being combined with ReO4 <-> to realize separation, and the water-phase solubility of the extraction agent is reduced, thereby reducing the dissolution loss of the extraction agent; a large-steric-hindrance aromatic ring is introduced to react with quaternization, an aliphatic chain is introduced to an N-active site, and the electrical property of an imidazole ring and the distribution condition of electron clouds are adjusted, so that a Z-bond network is formed in an organic phase and can be effectively bonded with perrhenic acid radical ions; lone pair electrons of the N-activation site and imidazole ring conjugated electron cloud cooperate with each other, so that perrhenate ions can be combined to the maximum extent.

The invention discloses a method for preparing rhenium dioxide based on sodium formate reduction of perrhenate radicals, and belongs to the technical field of metal material powder metallurgy preparation. The method comprises the following steps: adding perrhenate radicals into an aqueous solution containing sodium formate, taking ionizing radiation such as a < 60 > Co source and an electron accelerator as an energy source, and carrying out irradiation under the ionizing radiation to reduce precipitation to prepare rhenium dioxide. At present, perrhenate radicals can only be reduced to rhenium trioxide through a photoelectrocatalysis method, but the perrhenate radicals can be reduced to rhenium dioxide in a lower valence state through a radiation method; compared with a radiation method using alcohol as a sacrificial agent, the method has the advantages that rhenium dioxide precipitates instead of rhenium dioxide colloids can be directly generated by using sodium formate as the sacrificial agent, so that product separation is facilitated, and the yield is higher. More importantly, the usable radiation source is a commercial electron accelerator with an extensible scale, and the industrial prospect is achieved.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a method for recovering rhenium in rhenium-molybdenum leachate. The method comprises the steps of activated carbon adsorption, oxygen calcination, cooling collection, ammonia water pressurization oxidation leaching, heating concentration and potassium perrhenate preparation. According to the method, the problem of organic pollution is solved, the technological process is simplified, and the product purity and the environmental protection level are improved; the total recovery rate of rhenium reaches 97.8% or above, and the purity of the potassium perrhenate product reaches 99.95% or above.