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The separation factors shown in Figure 5 indicate that tungsten and rhenium can be readily separated with 0.9% NaCl solutions at pH levels below 7.5. Based on these data, hydroxyapatite based generators were constructed using four 0.9% NaCl solutions at pH 5.5, 6.0, 6.3, and 6.5 (series A), and using hydroxyapatite particles of three sizes ...
Table 1 summarizes the reported results on the effect of alloying elements on tungsten's DBTT. The tungsten-rhenium alloys are, of course, the most well-known tungsten alloy system enhancing ductility [23, 40, 41].Most reported research on tungsten-rhenium alloys shows the combined effects of rhenium alloying and thermomechanical …
Hatanoa et al. [21] reported that adding rhenium can reduce DBTT and improve ductility of tungsten materials, in particular, W-26%Re alloys exhibit plasticity at room temperature [22], but rhenium ...
Abstract. A process is described for recovering tungsten and rhenium from a relatively impure tungsten and rhenium solution. The process consists of: (a) adjusting the pH of the relatively impure solution to from about 9.0 to about 10.0 to precipitate impurities contained therein and form a purified tungsten and rhenium solution, the pH adjustment from a …
costly, tungsten-rhenium alloys. Pugh et al. (ref. 5) have demonstrated that this is the case with fine wire of doped tungsten made by powder metallurgy techniques. In a pre-vious study (ref. 6), room-temperature bend ductility in worked sheet fabricated from electron-beam-melted tungsten alloys with 2 and 6 percent rhenium was observed.
A process for recovering tungsten and rhenium from a relatively impure tungsten and rhenium solution, said process comprising: (a) adjusting the pH of said relatively impure solution to from about 9.0 to about 10.0 to precipitate impurities contained therein and form a purified tungsten and rhenium solution, the pH adjustment from a value below ...
Tungsten-rhenium alloys are also applied in rotating anodes, e.g., for mammography, angiography and computer tomography (CT). These days the most frequent rhenium application is the production of superalloys for jet engines. The nickel superalloys contain 3–6% rhenium and are utilized in combustors, turbine blades and jet nozzles.
In this work, recovering rhenium from molybdenum and arsenic containing H 2 SO 4 solutions was studied with three weak anion exchangers. Experimental studies were done as batch uptake kinetics and single column experiments, and the system was also modeled. ... Recovery and refining of rhenium, tungsten and molybdenum from …
1. The Application of Titanium in The Production of Vitamin B1. Vitamin B1 is mostly produced by the hydrogen chloride conversion method, and the finished product is dried by a cyclone and separated by two cyclones. The medium is thiamine hydrochloride with a PH value of 2.5 and a temperature of 110°C, so it is very corrosive.
Journal o f the Less-Common Metals, 86(1982)121 -128 121 RECOVERY AND REFINING OF RHENIUM, TUNGSTEN AND MOLYBDENUM FROM W-Re, Mo-Re AND OTHER ALLOY SCRAPS B. HESHMATPOUR* and R. E. McDONALD Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830 (U.S.A.) (Received …
of secondary rhenium, recovering rhenium from nickel-base superalloy scrap, spent oil-refining catalysts, and foundry revert. The major uses of rhenium were in superalloys used in high-temperature turbine engine components and in petroleum-reforming catalysts, representing an estimated 80% and 15%, respectively, of end uses. Bimetallic
Operating molybdenum and tungsten mine in China. ... and tungsten concentrate, while recycling byproducts including copper, rhenium, fluorite, and iron. In 2019, CMOC produced 14,918 tonnes of molybdenum and 10,722 tonnes of tungsten. ... cultivating new profit growth opportunity by recovering associated iron resources;
Rhenium has an extremely high melting point (3180 °C), only lower than carbon (3500 °C) and tungsten (3422 °C) of all the elements. Rhenium has a heat-stable crystalline structure and excellent ductility from freezing to very high temperatures, making it exceptionally resistant to heat and wear (Millensifer et al., 2014, John et al., 2017).
This paper presents a review of both primary and secondary processing technologies for the recovery of rhenium. A variety of processing technologies exist for …
This report showcases five examples of industries applying circular strategies for CRMs: (1) recycling of tungsten carbide scrap by H.C. Starck Tungsten, (2) recycling of battery cathode materials by SungEel Hitech, (3) recovery of rare earth elements from hard disk drives by Group, (4) closed rhenium loops by Rolls-Royce, and (5) recovery …
SECTION 1. IDENTIFICATION. Product Name: Tungsten Rhenium Alloy Product Number: All applicable American Elements product codes, e.g. W-RE-02, W-RE-03, W-RE-04, W-RE-05 CAS #: 1 Relevant …
Two types of tungsten-rhenium wires with nominal composition of 80W-20Re and diameter of 80 μm and with different nanofibrous structures were used in this study. These wires were prepared by sintering tungsten powder and rhenium powder, and successive hot working and cold drawing. Tungsten-rhenium wires with coarse and fine na-
Tungsten–rhenium thermocouples are ideal alternatives to platinum–rhodium thermocouples for high-temperature measurement. This is attributed to the high thermal electromotive force, high melting point, rapid response, and cost efficiency of tungsten–rhenium thermocouples [1–3].ASTM International standardized a W–5% …
Historically, tungsten-25wt.% rhenium alloy has been manufactured into wire for the thermocouple market, but recent demands for high-temperature structural components have forced the development of novel processing techniques for tungsten-rhenium and tungsten-rhenium with hafnium carbide. With a melting temperature of …
The main steps for recovery include alkali fusion, recrystallization, hydrogen reducing and washing.
The results showed that the tungsten-rhenium wires with nanofibrous grains exhibited a very high tensile strength reaching values of 3.5 GPa and 4.4 GPa for the coarse (grains diameter of 240 nm ...
A variety of processing technologies exist for recovery from both primary and secondary sources of rhenium. Currently, there are no …
In fusion applications, tungsten (W) based alloys are known to harden and embrittle as a result of irradiation-assisted transmutation to rhenium (Re) and its subsequent precipitation into non ...
Experimental data show that the accumulation of rhenium and osmium from transmutation reactions severely affect the microstructural evolution and property degradation of tungsten-based materials under neutron irradiation. Theory and modeling have confirmed that Re atom transport in W is by irradiation-produced migrating self …
Tungsten alloy with addition of rhenium and tantalum was prepared by laser sintering. Microstructure and properties of the samples were tested by optical microscope, X-ray diffractometer and ...
Recovery of rhenium from tungsten‑rhenium wire by alkali fusion in KOH-K2CO3 binary molten salt Longgang Ye a, Zhen Ouyang a, Yongming Chen b, Shufen Liu b Add to Mendeley https://doi/10.1016/j.ijrmhm.2019.105148 Get rights and content • …
The calibration results show that the thin film thermocouples based on the tungsten-rhenium material achieve ideal static characteristics and work well in the practical applications. A tungsten-rhenium thin film thermocouple is designed and fabricated, depending on the principle of thermal-electric effect caused by the high temperature. The …
Rhenium can be recovered together with tungsten, molybdenum, platinum and other valuable metals from spent catalysts, which contain about 0.3 wt% Re. Every …
A variety of processing technologies exist for recovery from both primary and secondary sources of rhenium. Currently, there are no known primary rhenium deposits; thus, the method in which primary rhenium is produced is dependent on the commodity of which it is a byproduct, e.g., copper, molybdenum, uranium, etc. In addition, focus on the …
