47 results about "Perrhenic acid" patented technology

To provide a method which can manufacture highly-pure perrhenic acid using a dry process from crude rhenium sulfide. A manufacturing method of perrhenic acid aqueous solution contains a process of gasifying and discharging sulfur oxide and getting rhenium oxide as burning residual by performing furst burning of rhenium sulfide in presence of oxygen content gas and producing the rhenium oxide and the sulfur oxide; a process of collecting gasified rhenium oxide by performing second burning of the burning residual in presence of the oxygen content gas; a process of cooling and solidifying the gasified rhenium oxide or a process getting a perrhenic acid aqueous solution by dissolving the gasified rhenium oxide in water while cooling with water; and a process of getting the perrhenic acid aqueous solution by dissolving the solidified rhenium oxide in water, or heating and gasifying the solidified rhenium oxide and dissolving it in water, when the rhenium oxide is solidified.

The invention discloses a preparation method of high purity ammonium rhenate, the method comprises the following steps of S1, dissolving ammonium rhenate in pure water to obtain an ammonium rhenate solution and adjusting pH value to 7 to 10, then performing oxidation and precipitation in sequence, and centrifuging to obtain an ammonium rhenate solution without containing TI; S2, after performing concentration and crystallization on the ammonium rhenate solution without containing TI, performing oxidation volatilization to obtain a perrhenic acid solution; S3, exchanging the perrhenic acid solution by adopting a cation exchange resin for removing impurities; S4, adding ammonia water into the perrhenic acid solution subjected to adsorption and impurities removal and performing concentrationand crystallization to obtain the high purity ammonium rhenate. According to the preparation method of the high purity ammonium rhenate disclosed by the invention, TI<+> in the ammonium rhenate solution is oxidized into TI<3+>, a harmful impurity TI is removed through a synergistic effect of hydrolytic precipitation of TI<3+> and adsorption packaging of a flocculating agent, then trace TI and other impurity elements are removed through oxidation volatilization, ion exchange and concentration crystallization to obtain the high purity ammonium rhenate with low TI content, the high purity ammonium rhenate meets the requirements of rhenium with low TI content in aeronautical material.

The invention belongs to the field of separation and reclamation of dispersed elements, and particularly relates to a method for separating and recovering a rhenium element. The method comprises the following steps: transforming a sample containing rhenium into a perrhenic acid ReO4<-> solution; enabling mannich alkali of calixarene to react with perrhenic acid ReO4<-> under an acid condition, so as to generate a white precipitate of perrhenic acid calixarenes ammonium salt; enabling the white precipitate of the perrhenic acid calixarenes ammonium salt to react under an alkaline condition; degrading the product into the perrhenic acid ReO4<-> and the mannich alkali of calixarene; concentrating the perrhenic acid ReO4<-> dissolved into the alkali; finally separating out perrhenate; recycling the calixarene mannich alkali after filtering. The method disclosed by the invention is simple, low in cost, free of pollution, and high in yield; no organic solvent is used in an operation process, and the pH value is controlled, so as to achieve the targets of separation and recovery. The reagent calixarene mannich alkali for recovery can be recycled.

The invention belongs to the molybdenum metallurgy industry in the field of nonferrous metallurgy, and relates to a method for extracting molybdenum and rhenium from rhenium-containing molybdenum concentrate, which specifically includes 8 steps, which are pretreatment process, mixing and granulation process, solidification and roasting process, Water leaching process, precipitation, crystallization process, acid leaching process, co-extraction-reextraction process, acid precipitation process, the obtained molybdenum is crystallized in the form of ammonium tetramolybdate, and rhenium is crystallized in the form of potassium perrhenate. The present invention pretreats the molybdenum concentrate to remove lead, so that the lead is recovered in the form of lead dichloride, and the harm of lead is greatly reduced. Quicklime is added to convert the sulfide in the concentrate into sulfate, and eliminate the sulfide produced in the oxidation roasting process. SO 2 In addition, the process of the present invention is expected to shorten the process flow, reduce equipment investment, improve the recovery rate of molybdenum and rhenium and the quality of products, and facilitate the production of ammonium molybdate products.

The invention relates to the technical field of nuclear fuel reprocessing, and discloses a MOFs material for fluorescence recognition of pertechnetate or perrhenate, its preparation method and application, using tetrabromotetraphenylethylene, 5-pyrimidine boronic acid and potassium carbonate as reactants , tetrakis(triphenylphosphine) palladium is used as a catalyst to prepare tetrapyrimidine tetraphenylethylene; and tetrapyrimidine tetraphenylethylene is used as a ligand to mix with silver nitrate to react to obtain the MOFs material. The MOFs material can produce obvious fluorescence changes after absorbing pertechnetate or perrhenate, and realize the recognition of pertechnetate or perrhenate through the change of fluorescence color. It is an excellent fluorescent material, and it can also effectively adsorb pertechnetate or perrhenate, and is used for adsorption and separation of pertechnetate in the post-processing of nuclear fuel.

The invention discloses an imprinted polymer for separating perrhenate ions, a preparation method and application thereof, and belongs to the field of hydrometallurgy. In this method, perrhenate (ReO 4 ‑ ) is a template ion, N-vinylpyrrolidone (NVP) and acrylic acid (AA) are functional monomers, N'N-methylenebisacrylamide (NMBA) is a crosslinking agent, H 2 o 2 ‑Vc is the initiator, water is the solvent, and the perrhenate ion-imprinted polymer (ReO 4 ‑ ‑IIP), and use it as an adsorption adsorbent to separate and recover the rhenium (Re) element in the rhenium-containing waste solution, which improves the separation effect and recovery efficiency of Re. The ion imprinted polymer prepared by the invention has high selectivity, large adsorption capacity, high desorption rate and high reuse rate, and makes up for the shortcomings of traditional separation materials in the field of alloy wet recovery.