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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 time was 6 h, the rhenium recovery was 90–95% and the rhenium recovery ratio was 7.3–45 times that of tungsten.

There is current interest in recovering rhenium from solutions produced as a result of copper heap and stockpile leaching. Copper-bearing leach solutions typically …

The rhenium recovery process was characterized by its simplicity, stabilization and efficiency. According to production statistics the average content of …

Although various novel adsorbents with different structures are exploited for rhenium recovery, developing cost-effective micron-sized adsorbents with high adsorption capacity, rapid uptake, and excellent selectivity is still challenging from a practical point of view. ... In current work, two ionic liquid functionalized cellulose microsphere ...

As per the current industrial practice, oxidation of sulfides (including iron sulfide) to form sulfur dioxide is an essential step in the production scheme of Cu, Mo and Re [10], [11]. ... Technological issues existed in the recovery of rhenium from industrial waste water terms with of low rhenium content and high sulfuric acidity. To solve the ...

The sulfuric-acid leaching kinetics of nickel as the main component of grinding wastes originating from machining a rhenium-containing heat-resistant ZhS-32VI superalloy and containing the impurities of abrasive materials, oils, ceramics and other pollutants has been studied in the agitation mode concentrating refractory metals in the solid residue. …

There is provided a hydrometallurgical process of recovering rhenium values from mixtures thereof with other metal values in which the rhenium values constitute a minority amount, for example super-alloys, which comprises subjecting the mixture to strongly oxidizing acid conditions, preferably an aqueous mixture of hydrochloric acid and nitric acid, so as to …

In general, hydrometallurgical rhenium recovery processes involve alkaline or acid leaching and/or electro-decomposition of the scrap or waste followed by separation using solvent extraction [6], [14], [22], ion exchange [12], [23], adsorption [24], and precipitation [25]. ... superalloy scraps are recycled to alleviate the current resource ...

The current technology for Re recovery involves capturing Re 2 O 7 from gases produced during Mo and Cu pyrometallurgical processing . ... Rhenium recovery from solutions containing copper could be performed using culture in the stationary phase of growth, and in the case of solutions containing rhenium, copper, and molybdenum, …

The current industrial practice of recovery rhenium from rhenium bearing materials can be described as leaching–extraction and leaching-ion exchanging resin absorbing–eluting processes (Li and Zhu, 1992, Gupta, 1992, Tao, 1996, Juneja et al., 1996, Kholmogorov and Kononava, 1999, Yun et al., 2006). ... The recovery of rhenium from …

There is current interest in recovery of rhenium from solutions produced during the leaching of low-grade copper resources. Large scale heap and stockpile leaching takes place at many copper operations throughout the world. During leaching for copper, large volumes of dilute acid ferric sulfate solutions comes in contact with molybdenite and ...

Rhenium is characterized by a high alloy fraction (70%) and a moderate-to-high functional recycling rate. Rhenium's alloy use is entirely in superalloys—high in value and efficiently tracked ...

The current generation of superalloys contains 5–6% rhenium by weight. ... Rhenium recovery has been reported to reach 97% for crushed catalysts and 87% for uncrushed catalyst samples. This result would be expected as the use of cruched catalysts leads to a greater surface area for the dissolution reaction.

Rhenium recovery reached 97% for crushed catalysts, and 87% for uncrushed catalyst samples. After dissolution, the aque- ous rhenium is crystallized via evaporative crystallization as an ammonium ...

There is current interest in recovering rhenium from solutions produced as a result of copper heap and stockpile leaching. Copper-bearing leach solutions typically contain rhenium at ...

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 ...

Conditions at which Re2O7 is reduced to rhenium metal by S2 have been identified and key process conditions are outlined to maximize performance of the LSO scheme and rhenium recovery. View Show ...

Most manufacturers that can realize rhenium recovery use molybdenum concentrate and copper concentrate with high rhenium content as raw materials to …

rhenium than that of molybdenum, the recovery of rhenium from rhenium bearing materials has both economic and environmentally beneficial [1, 2]. The best sources of rhenium are molybdenite concentrate

Abstract. Lead sludge from copper production is a source of rare metals, such as rhenium and osmium, whose content reaches 0.06–0.08% and 0.0025–0.0050%, respectively. The base of the sludge consists of lead sulfate. A method of reductive smelting of lead sludge from copper smelting production at 1000–1100 °C has been developed.

The current technology for rhenium recovery involves capturing Re 2 O 7 from the gases produced during Mo and Cu pyrometallurgical processing. During the oxidative processing of the Cu and Mo sulfide ores, the rhenium contents are also oxidized to the volatile Re 2 O 7, which reports to the gas phase that also contains the SO 2 …

Rhenium (Re) is one of the rarest elements on the earth's crust with the atomic number 75. It is utilized as an additive tungsten and molybdenum-based alloy to provide useful characteristics. Rhenium catalysts are highly resistant to poisons, such as nitrogen oxides, sulfur, and phosphorus, and are utilized for the hydrogenation of fine ...

Although various novel adsorbents with different structures are exploited for rhenium recovery, developing cost-effective micron-sized adsorbents with high adsorption capacity, rapid uptake, and excellent selectivity is still challenging from a practical point of view. In current work, two ionic liquid functionalized cellulose microsphere (ILFC-NO 3 …

Processes for Re recovery from lead slime via oxidation roasting and hydrometallurgical leaching, or from in-situ leaching of Re-containing uranium ore are in use, although less commercially...

A process is disclosed wherein essentially all of the rhenium can be removed from an aqueous solution of molybdenum without the extraction of molybdenum using a particular solvent extraction solution. The extraction solution consists essentially of quaternary ammonium compound and at least about 50 percent by volume of a highly aromatic …

The base mineral raw materials for recovery of rhenium are solid and liquid by-products of copper, lead and uranium production.In pyrometallurgical processing of sulfide copper concentrates ...

The current technology for Re recovery involves capturing Re 2 O 7 from gases produced during Mo and Cu pyrometallurgical processing [4]. ... Activated carbon is a suitable sorbent for rhenium ...

With current global demand at only ∼50 t Re/yr, our minimum global estimate would be sufficient to meet global demand for centuries, unless a major shift in the use of Re takes place to boost future demand. ... Rhenium recovery is predicted to be a process with a great potential because over 80% of rhenium can be recovered (Shen et …