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Expert consulted on the manufacturing of molybdenum, tungsten, and rhenium chemicals: troubleshooting, unit operation startups and new product development.He advised on the recovery of copper, nickel, cobalt, lead, and precious metals from industrial wastes: troubleshooting, unit operation startups, and new product development.
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Rhenium was also recovered efficiently and selectively from rhenium–tungsten solutions (initial concentration 10.4 mM for each metal): when the pH ranged from 7.0 to 12.0 and the irradiation ...
The rhenium's production base in Russia is based on the processing of the concentrates of the effective tungsten-molybdenum mines (Zhirkenskyi, Sorskyi, Tyrnyauzskyi) and opening up of the new ones (Bugdainskyi, Aksukskyi and others), as well as on the recovery of rhenium from the gases during the burning of the shales.
Nov 01, 2018· The lack of rhenium raw materials sources on the territory of Russia leads to the necessity of this valuable metal recovery from wastes and secondary raw materials, in particular, from tungsten-rhenium alloys. The using of hydrometallurgical and electrochemical technologies is the most promising way to dissolve and recovery these metals in the ...
The lack of rhenium raw materials sources on the territory of Russia leads to the necessity of this valuable metal recovery from wastes and secondary …
Alloys of palladium with tungsten, rhenium, osmium and iridium Physical and chemical properties of platinum metals alloyed with tungsten, rhenium, osmium, and …
The direct electrodialysis recovery of rhenium from the alkaline electrolytes formed during the anodic dissolution of tungsten–rhenium alloys is found to be unreasonable because of a rapid ...
Rhenium (IPA: /ˈɹiːniəm/) is a chemical element in the periodic table that has the symbol Re and atomic number 75. A silvery-white, rare, heavy, polyvalent transition metal, rhenium resembles manganese chemically and is used in some alloys. Rhenium is obtained as a by-product of molybdenum refinement and rhenium-molybdenum alloys are superconducting. . This was …
Jan 31, 2015· If the partitioning coefficient of rhenium, tungsten and molybdenum between the γ matrix and the γ' precipitates is taken into account, the effectiveness of the alloying elements in two-phase superalloys can be calculated and the rhenium effect can be explained.}, doi = {10.1016/j.actamat.2014.12.011}, journal = {Acta Materialia}, number ...
May 01, 2021· In-situ field-ion microscope study of the recovery behavior of heavy metal ion-irradiated tungsten, tungsten (rhenium) alloys and molybdenum. [30 keV W/sup +/ and Mo/sup +/] Technical Report Nielsen, C. H.
Production Technology of Tungsten Rhenium Wire: 1) Careful select the raw materials 2) Controlling production process be strict. The simple step of Tungsten-rhenium wire process: Mixing - Sintering - Swaging - Drawing - Inspection - Packaging Packing :Each Set 400-600g, 250m-260m per kg, Vacuum Packaging, Carton and bags.
Rhenium was also recovered efficiently and selectively from rhenium–tungsten solutions (initial concentration 10.4 mM for each metal): when the pH ranged from 7.0 to 12.0 and the irradiation time was 6 h, the rhenium recovery was 90–95% and the rhenium recovery ratio was 7.3–45 times that of tungsten.
Recovery and refining of rhenium, tungsten and molybdenum from W-Re, Mo-Re and other alloy scraps. ... The recycling and recovery of tungsten and molybdenum is also essential because of their increasing use in high temperature alloys, metal carbides, cutting and drilling tools, and a variety of other applications. ...
[6] J. Matolich, H. Nahm, J. Moteff, Swelling in neutron irradiated tungsten and tungsten -25 percent rhenium, Scripta Metallurgica 8 (1974) 837-841. DOI: 10.1016/0036-9748(74)90304-4 [7] T. Noda, M. Fujita, M. Okada, Transmutation and induced radioactivity of W in the armor and first wall of fusion reactors, Journal of Nuclear Materials 258 ...
A process is disclosed for recovering chromium from a chromium bearing material containing cobalt, molybdenum, and tungsten. The process involves roasting the material and alkali metal compound at a temperature of at least about 400° C. for a sufficient time to react the alkali metal compound with the material and form a reacted mixture containing essentially all of the …
The present invention relates to a method for recovering rhenium from an ethylene oxide catalyst containing rhenium and at least silver on a solid support, wherein at least a substantial portion of the rhenium present in the catalyst is extracted by intimate contact of the catalyst with one or more polar non-acidic organic solvents substantially free of water such that a rhenium …
Rhenium heptoxide, Re 2 O 7 sublimes due to its high vapour pressure and escapes with the flue gases. Rhenium heptoxide is soluble in water and so HReO 4 is formed. It is then passed through multistage pressure-jet venturi scrubbers that enable high rhenium recovery efficiencies up to 90%. Production of rhenium metal powder and pellets
Rhenium also is associated with copper minerals in sedimentary deposits in Armenia, Kazakhstan, Poland, Russia, and Uzbekistan, where ore is processed for copper recovery and the rhenium-bearing residues are recovered at copper smelters. Substitutes: Substitutes for rhenium in platinum-rhenium catalysts are being evaluated continually.
Jul 20, 2021· Additively manufactured tungsten-rhenium alloys have been compared with pure tungsten in terms of their volumetric density, cracking behavior, microstructure, and hardness. The compositions W-5 wt.%Re and W-25 wt.%Re were explored. Increasing the rhenium content led to an increasing percentage of the theoretical density, with a maximum of 97.6% achieved …
Jul 28, 2010· Rhenium Market Reliant on Aerospace for Recovery ... 109 8.3 Consumption of rhenium in other end-uses 111 8.3.1 Use of tungsten-rhenium and molybdenum-rhenium alloys 111 8.3.1.1 Use of rhenium ...
This is believed due to the formation of rhenium, as a result of thermal-neutron (n, γ) reactions in tungsten. The shifts of the peak temperatures of the lower-temperature recovery regions are believed to result primarily from the weakening of the lattice by rhenium at low temperatures and high thermal-neutron fluences.
Rhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-gray, heavy, third-row transition metal in group 7 of the periodic table.With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust.Rhenium has the third-highest melting point and highest boiling point of any stable …
A process is disclosed for separating tungsten from a solution containing tungstate and perrhenate ions. The process involves reacting a sufficient amount of hydrochloric acid with the solution at a sufficient temperature to form a solid containing essentially all of the tungsten and a liquor containing essentially all of the rhenium, and separating the solid from the liquor.
May 06, 2017· V. P. Guro and A. A. Belov, "Repeated removal of ammonium perrhenate and the recovery of rhenium from the wastes of rhenium-containing alloys," in Proceedings of Conference on Resource-Recycling, Low- Waste, and Nature-Saving Technologies of Land Reclamation (Ust'-Kamenogorsk, 2012), pp. 165–166. Google Scholar 7.
The lack of rhenium raw materials sources on the territory of Russia leads to the necessity of this valuable metal recovery from wastes and secondary raw materials, in particular, from tungsten-rhenium alloys. The using of hydrometallurgical and electrochemical technologies is the most promising way to dissolve and recovery these metals in the form of prospective precursors.
Abstract. A detailed study of the recovery of defects in tungsten after fast neutron ( E m ⩾ 1 MeV) irradiation at about 70° C over a fast neutron fluence range from 8.5 × 10 17 n/cm 2 to 1.5 × 10 21 n/cm 2 has been completed. Three principal recovery regions have been observed at about 0.15 T m, 0.22 T m, and 0.31 T m where T m is the melting temperature of tungsten in °K.
rhenium requirements by about 50 percent. The number of companies that process molybdenum-rhenium scrap and tungsten-rhenium scrap continues to grow, especially in the United States and Germany. In addition, spent platinum-rhenium …
Rhenium occurs up to about 20 parts per million in molybdenite and to a lesser extent in sulfidic copper ores. The recovery of rhenium is aided by the concentration of its volatile heptoxide (Re 2 O 7) in the flue dust and gases given off during the smelting of molybdenite ore or from its concentration with the platinum metals in the anode sludge during electrolytic copper refining.
Jan 11, 2018· Rhenium is named for the Rhine River (Rhenus being Latin for Rhine) and is one of the rarest elements in the Earth with an estimated 1 part per billion. Of all the elements, rhenium element has the third highest melting point (behind only tungsten and carbon) as well as the fourth most dense (behind platinum, iridium and osmium).
Rhenium recovery from recycling is about 23 ton per year, and reported to be increasing (Dodson et al. 2011, Zimmerman andGößling-Reissemann 2014; Anderson et al. 2013). Recycling of rhenium ...
Rhenium (Re), a silvery gray metal that is characterized by high hardness and density, is one of the rarest chemical elements.It can only be re-rolled at red-hot spots and has one of the highest melting and boiling temperatures after tungsten.. This metal is obtained mainly from molybdenum ores, especially molybdenum.
Nov 06, 2010· A combined electrochemical and chemical process was developed for the recovery of tungsten and cobalt from hard alloys of VK grades with the preparation of tungstic acid and cobalt oxalate as intermediates. The subsequent reduction of these intermediates in hydrogen yields metal powders of increased purity.