Complex electrochemical processing of the metallic wastes from a rhenium-containing nickel superalloy in sulfuric acid electrolytes

Palant, A; Levchuk, O. M.; Bryukvin, V. A.; Levin, A. M.; Paretskii, V. M.

doi:10.1134/s0036029511060176

Cited by 14 publications

(11 citation statements)

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“…For example, by adding HCl or hexamine (C 6 H 12 N 4 ) to an aqueous solution containing Re and W, tungstic acid (H 2 WO 4 , H 4 WO 5 ) and hexamine-tungsten compounds are formed that are separated from the Re in the solution. 187,269,270 The addition of CaO or Ca(OH) 2 to a NH 4 OH or NaOH solution containing Re, W, and Mo results in the conversion of Mo and W in the aqueous solution to CaMoO 4 and CaWO 4 precipitates, respectively 170,196 (cf. Figure 19,24).…”

Section: Purification Methods For the Rhenium Present In Aqueous Solu...mentioning

confidence: 99%

“…Flowchart of the process of electrochemical digestion of superalloys in a H 2 SO 4 electrolysis bath. 170,171 Figure 20. Flowchart of the process of the digestion of superalloys in a molten alkali salt bath followed by Re separation.…”

Section: Recycling Of Rhenium From Scrapsmentioning

confidence: 99%

“…To overcome these problems, techniques for the direct dissolution of large pieces of superalloy scraps by utilizing electrochemical oxidation, which does not require pulverization pretreatment, have been developed. 141,[165][166][167][168][169][170][171][172][173][174][175][176][177][178][179] In this regard, Krynitz et al developed a method for the anodic dissolution of a superalloy in an organic solvent electrolytic bath to separate and recover valuable metals. 168 Figure 17 shows the flowchart of their process.…”

Section: Recycling Of Rhenium From Scrapsmentioning

confidence: 99%

“…196 Palant et al conducted the electrolysis of a Ni-based superalloy by using alternating current in a H 2 SO 4 bath and HNO 3 bath, respectively. 170,171 Figure 19 shows the process flowchart of the electrochemical oxidation of superalloys in a H 2 SO 4 electrolysis bath. More than 70% of the Re in superalloys is separated and concentrated in anode slimes when using the H 2 SO 4 electrolysis bath.…”

Section: Recycling Of Rhenium From Scrapsmentioning

confidence: 99%

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Review: Rhenium and its smelting and recycling technologies

Yagi,

Okabe

2024

International Materials Reviews

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Rhenium is utilized as an additive to improve the high-temperature strength and stability of materials, such as nickel-based superalloys, which are employed in jet engine turbine blades, alloys for ultrahigh-temperature thermocouples, and platinum catalysts, which are used in oil refining. Currently, around 80% of rhenium demand is for superalloy production, and this demand has been increasing with the increase in demand for aircrafts. The abundance of rhenium in the earth's crust is only 1 ppb (10−9), which is less than those of platinum and gold. Owing to the rare and unevenly distributed nature of rhenium, there is the risk of supply disruption and rapid increases in its price. In this article, the recent situation of rhenium and its compounds are reviewed, especially with respect to their demand, distribution characteristics, smelting, and recycling. Some of the technologies recently developed for smelting and recycling rhenium are also introduced.

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Section: Purification Methods For the Rhenium Present In Aqueous Solu...mentioning

confidence: 99%

Section: Recycling Of Rhenium From Scrapsmentioning

confidence: 99%

Section: Recycling Of Rhenium From Scrapsmentioning

confidence: 99%

Section: Recycling Of Rhenium From Scrapsmentioning

confidence: 99%

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Review: Rhenium and its smelting and recycling technologies

Yagi,

Okabe

2024

International Materials Reviews

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“…Titanium baskets containing the superalloy scrap are used as electrodes 22,45) . Fig.6 Flowchart of a process for the electro chemical digestion of superalloys in H2SO4 electrolysis bath 46,47) . Fig.7 Flowchart of a process for the digestion of superalloys in molten alkali salt bath followed by Re separation 49) .…”

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confidence: 99%

Current Status of Recycling of Rhenium and Process Technologies

Yagi

Okabe

2016

Journal of the Mining and Materials Processing Institute of Jap

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レニウム (Re) は高融点 (3453 K) かつ高弾性率 (室温で 460 GPa) を有するレアメタルである 1) 。特定の金属に Re を添加する Rhenium (Re) is used as an additive in several alloys, such as nickel-based superalloys for jet engine turbine blades, platinum catalysts for oil refining, and thermocouples used at ultra-high temperature, in order to improve strength and stability at high temperature. Due to the rare and unevenly distributed nature of Re, there is risk of supply disruption owing to supply shortage and the rapid increase in Re price. To minimize the risk of a supply disruption, processes for recycling Re from Re-containing alloys and catalysts have been developed. In this article, we review characteristics of Re-containing materials and the current status of Re recycling; we also introduce some recent recycling technologies for recovering Re from various scraps.

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