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micrometer zirconium hafnium and their ternary borides As a comparison synthesis of zirconium diboride using phenolic resin with poor complexation ability was also conducted 2 Experimental procedure A general procedure for the precursor preparation was depicted as
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Read Polarographic Determination of Zirconium and Hafnium with EDTA Journal of the Chinese Chemical Society on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips
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Instrument analysis method is used in this experiment which detecting the zirconium content of zirconium powder by using plasma-atomic emission spectrometer In this experiment the instrumental detective conditions were determined and analyzed several main factors affecting the experimental results concluded the effects of temperature hydrofluoric acid and deionized water on dissolving
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FIELD: chemistry SUBSTANCE: method of extracting zirconium and hafnium from process solutions to obtain an extract for further extraction of said elements includes combined extraction of zirconium and hafnium from nitrate solutions with tributyl phosphate solutions in an organic diluent based on unsaturated aromatic hydrocarbons
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Separation of hafnium tetrachloride from zirconium tetrachloride by introducing zirconium tetrachloride containing about 2-4 wt percent of hafnium tetrachloride into an electrolytic cell filled with a molten salt and dissolving it to make an electrolytic bath Running first phase electrolysis which produces zirconium trichloride containing a lower hafnium content than the dissolved zirconium
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Crystal bar hafnium dissolving in hydrofluoric acid and in hydrofluoric-hydrochloric acid mixtures exhibited a positive difference effect similar to that previously observed for zirconium dissolving in hydrofluoric acid The effect was so pronounced as to completely overbalance the hydrogen volume developed by the internal polarization current and to reduce the rate of self-dissolution
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zirconium tetrachloride translation in English-French dictionary en (c) 1773 ferric chloride anhydrous (iron (III) chloride anhydrous) 2331 zinc chloride anhydrous 2440 stannic chloride pentahydrate 2475 vanadium trichloride 2503 zirconium tetrachloride 2508 molybdenum pentachloride 2802 copper chloride 2869 titanium trichloride mixture
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Zirconium sulfate It is the important raw material in the production of leather tanning agent wool processing agent and paint surface oxidation agent can be used as a catalyst carrier amino acid and protein precipitant and deodorant intermediate raw materials are for zirconium chemicals and metal zirconium and hafnium Zirconium oxide
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Also the wikipedia page on zirconium nitrate says it's prepared by dissolving zirconium oxide in nitric acid and evaporating off the excess which seems much easier than boiling it in sulphuric acid so maybe it's possible to use the nitrate instead?
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USGS Minerals Information: Zirconium and Hafnium Zirconium and hafnium are contained in zircon at a ratio of about 50 to 1 Zircon is a coproduct or byproduct of the mining and processing of heavymineral sands for the titanium minerals ilmenite and rutile or tin minerals
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Extraction of zirconium and hafnium by D2EHPA extractant in nitric acid media is shown in Fig 6 Since D2EHPA is a stronger organic acid than Cyanex 272 it gives higher extraction from more concentrated acids than Cyanex 272 Therefore extraction of hafnium and zirconium in 0 1 M nitric acid solution is approximately complete
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zirconium alloys while Fe improves corrosion resistance Ni intensifies hydrogen absorption which in turn decreases fracture toughness The detrimental effects of impurities on the properties of zirconium alloys are synergistic Solvent extraction and separation of hafnium from zirconium using Ionquest 801
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Water-Based Syntheses In addition to lowering reaction temperature aqueous synthesis eliminates the environmental and human health risks associated with organic solvents To this end research effort has been dedicated to the development of water-based syntheses for an assortment of MOFs including those of aluminum hafnium iron and zirconium
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of hafnium oxide in the manufacture of optics resistors electronic ceramic the neutron absorbing compositions of the catalysts One of the main conditions of its appli-cation is high purity material The raw materials used in the mineral zironc containing 50% zirconium and 2 0% of hafnium Zirconium and hafnium are chemical ana-
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Hafnium sponge (consist of small dendritic crystals) Hafnium powder Hafnium crystal bars (made by iodide Van Arken and De Boer process) Hafnium zone refined rod Hafnium turnings Hafnium evaporation pellets Plasma-cutter copper electrodes with Hf tips and hafnium tips after dissolving of copper in the HNO 3 Hafnium carbide tipped endmill
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Zirconium sulfate It is the important raw material in the production of leather tanning agent wool processing agent and paint surface oxidation agent can be used as a catalyst carrier amino acid and protein precipitant and deodorant intermediate raw materials are for zirconium chemicals and metal zirconium and hafnium Two zirconium oxide
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The influence of extraction time on the extraction of hafnium and zirconium by the mixture of DIBK and P204 was conducted under the conditions of 117 1 g/L zirconium 2 89 g/L hafnium 1 0 mol/L acidity 3 0 mol/L NH 4 SCN in aqueous phase and 10% (v/v) P204 and 90%
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29 06 1976I claim: 1 A continuous process for the separation of the tetrahalides of hafnium and zirconium comprising dissolving a crude feed consisting essentially of hafnium tetrahalide and zirconium tetrahalide in a solvent comprising a near eutectic mixture of zirconium tetrahalide and at least one alkaline metal halide selected from the group consisting of sodium
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23 11 2019The column feed solution is prepared by dissolving the mixed zirconium-hafnium tetrachloride in an organic solution The organic solvent maybe an alcohol a ketone an aldehyde an organic acid or other similar solvent in which the tetrachloride will dissolve without decomposition of the tetrachloride or of the solvent
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Zirconium is used to make the cladding for uranium oxide fuel elements As mined zirconium contains 1-3% per cent of hafnium which is chemically very similar and although it is difficult to separate the two elements this has to be done for the metal used in the nuclear industry because hafnium absorbs neutrons very strongly
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1 O l f O-Z5 0 50 0 75 l OC HCL concentration mol/L K-value for the difference effect for hafnium metal dissolving in hydrofluoric- hydrochloric acid mixtures at 250C versus concentration of HCI The difference effect and anodic behavior of hafnium dissolving in hydrofluoric acid 275 TABLE 1
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A method for separating a metal (a) from a metal (2) preferably zirconium from hafnium which consists in dissolving said metals in an aqueous solution wherein said metals are in a state preventing them from passing through a nanofiltration membrane treating the aqueous medium with a ligand for example EDTA which is complexed with metal (1) and/or metal (2) then in
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osti gov technical report: the difference effect and anodic behavior of hafnium dissolving in hydrofluoric acid progress report on corrosion of nuclear metals the difference effect and anodic behavior of hafnium dissolving in hydrofluoric acid
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There is a method of dissolving zirconium bearing materials in a mixture of hydrofluoric and nitric acid (Processing of nuclear fuel Ed by S of Stoleru R R the century The disadvantages of this method are associated with a low rate of dissolution of zirconium strong corrosive solvent agents large amounts of generated solutions
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A process is provided for separating zirconium and hafnium tetrachlorides by the direct distillation from their solution in an eutectic mixture of sodium and potassium chlorides Hafnium tetrachloride and zirconium tetrachloride are provided in adequate purity for direct introduction into reduction units for the production of the respective metals by virtue of controlled ratios of the salt
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The invention concerns a method for separating a metal (1) from a metal (2) preferably zirconium from hafnium which consists in dissolving said metals in an aqueous solution wherein said metals are in a state preventing them from passing through a nanofiltration membrane treating the aqueous medium with a ligand for example EDTA which is
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Hafnium is not all that uncommon compared to many other exotic elements It occurs to the extent of 5 8 ppm of the Earth's upper crust by weight The reason why it took a long time to isolate is that its atoms have almost the identical size to those of zirconium along with which it typically occurs in minerals
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Hafnium is a chemical element with symbol Hf and atomic number 72 A lustrous silvery gray tetravalent transition metal hafnium chemically resembles zirconium and is found in many zirconium minerals Its existence was predicted by Dmitri Mendeleev in 1869 though it was not identified until 1923 by Coster and Hevesy making it the last stable element to be discovered Hafnium
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