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An interesting result for future research is the one obtained using Thy:DecA which is selective to Re(VII) (S Re / M o = 87). Although the extraction percentage is low (%E ≈ 10), this HES exhibits low viscosity and further optimization, for example, changing the aqueous-organic ratio (A/O), could increase the extraction of this valuable metal.
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A literature review on the production processes of rhenium by pyrometallurgical (roasting, smelting, distillation) and hydrometallurgical (leaching, extraction, reextraction, …
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Based on these results, a 40-electrode, 108-kva prototype of an industrial-sized cell was constructed and tested for extracting metal values from offgrade molybdenite concentrates. ... Molybdenum-rhenium extraction was unaffected by presence of chalcopyrite in the molybdenite concentrate; however, molybdenum extraction declines if the copper ...
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According to the orthogonal experiment results of rhenium extraction and rhenium molybdenum separation coefficient, rhenium extraction model, rhenium molybdenum separation coefficient model and the corresponding regression equation were established. The rhenium extraction performance of N263 was investigated by the rhenium equilibrium curve and ...
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Chemical Procedures for Rhenium Extraction from Geological ... shales in order to provide 'real-world' results and to maintain laboratory throughput. Additionally, the analysis of geolog- ...
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Modern trends in technological improvement for producing high-quality rhenium-containing molybdenum concentrates are aimed at developing environmentally friendly solutions com-pared to traditional ones, involving a reduction in consumption or complete replacement of toxic substances and the use of plant reagents and microorganisms and make it possible to …
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Rhenium concentration in scrubbed liquor remains significantly less (30–200 mg/L) than Mo(VI) concentration []; however, the high economic value of rhenium over molybdenum is more attractive to the metallurgists in recent time.Flue-dusts' leaching in water/dil. H 2 SO 4 followed by ion exchange and solvent extraction are the major techniques employed to …
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In addition, the result regarding radiation stability of the microemulsion extraction system indicates that the extraction efficiency of rhenium was almost unaffected given an extraction system irradiated below 200 kGy (Fig. 5 c), but the extraction efficiency of other competitive ions was inhibited to a certain degree (Fig. 5 b). Therefore ...
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At present, the available data on the behavior of osmium in the course of extraction of rhenium from washing sulfuric acid used in the production of copper are extremely limited and contradictory. In this connection, the investigation of its behavior in some processes of processing of osmium-containing raw materials and its purposeful accumulation in cruds prove …
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The article presents the results of oxidative leaching of lead sludge from copper production in order to extract rhenium into solution. The optimum regimes for product leaching man-made product in ...
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Rhenium is extracted from roasting fume and dust, leaching residue, and aqueous solution to produce a rhenium bearing solution. Subsequently, rhenium rich solution is …
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The results showed that the extraction at a concentration of A:O = 1:25, contact time = 10 min, pH = −0.5, and temperature = 25 °C was > 99.9 for Re in 100 mg/L Re synthetic …
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As extraction and recycling of rhenium from primary and secondary sources are of vital importance to the supply of rhenium in the industrial chain, there is a large amount of research carried out on rhenium extraction, recycling, and separation. Kasikov and Petrova (2008) reviewed the processing methods for spent platinum–rhenium catalysts.
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The results obtained in this study can provide additional information on the solvent extraction of rhenium employing TBP as the prominent organic extractant. Acknowledgements This research work was undertaken as an internal basic research by Mineral and Material Chemistry Lab. (Dept. of Chemistry), UAF, Pakistan.
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Rhenium‐Osmium geochronometry for samples with low Re and complex matrices require improved Re extraction methods. Here we investigate plausible controls on efficiency and efficacy of Re ...
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Rhenium(VII) extraction from sulfuric aqueous solutions using ionic liquids as diluent and extractant: insights on the extraction stoichiometry and process parameters. ... RESULTS. This extracting phase yielded high extraction percentages: 95% with only 3% (v/v) of [TOMA][BA] in [omim][Tf 2 N]. A detailed study of the SX stoichiometry was ...
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leaching of rhenium from the ash; ii) ethanol extraction of rhenium from raw leaves followed by evaporation of ethanol, ashing of dry residue and alkaline extraction of rhenium from the ash. It was found possible to concentrate rhenium 24 444 times (as compared to its initial concentration in soils) using ethanol extraction from green plant
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The present work addresses the recovery of rhenium from scrub liquor of molybdenite concentrate roasting fume and dust by solvent extraction method. According to the results, recovery of rhenium ...
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The experimental results shown in Fig. 5 illustrate that the extraction efficiency of rhenium was approximately 46% at 0.2 mol·L − 1 and increased to more than 50% at 1.0 mol·L − 1. Furthermore, it slowly increased up to approximately 80% with 4.0 mol·L − 1 chloride ion, leaving more than 300 mg·L − 1 of the rhenium content in the ...
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Rhenium is extracted from roasting fume and dust, leaching residue, and aqueous solution to produce a rhenium bearing solution. Subsequently, rhenium rich solution is generated by separation with...
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RESULTS AND DISCUSSION Extraction isotherms for TBP and TOPO The extraction of rhenium (VII) from hydrochloric acid solutions by TBP and TOPO in benzene at 20 o C gave the results presented in Figs. 1 and 2.
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Results indicated that only TOPO-based and N 8881-Cl-based HES did not form ... [54]. It should be noted that TOPO:LauA DES has previously been reported in metal extraction, specifically in the extraction of molybdenum (Mo) and rhenium (Re) from synthetic pregnant leach solutions, achieving an extraction efficiency of >90 % [55]. TOPO:LauA (1:1 ...
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Experiments were performed on crushed and uncrushed catalysts in both packed columns and agitated leach vessels. Experimental results showed that that rhenium is preferentially leached in the sodium bicarbonate solution. Rhenium …
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The results of the application of the synergistic extraction system to rhenium separation is resented in Table 2. As shown, even in the presence of high arsenic concentrations, i.e., the synergistic extraction system of TBP + Alamine 336 can selectively bind and extract the perrhenate ion instead of arsenate in solution.
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The extraction of rhenium from molybdenite roasting dust leach solution was performed using a mixersettler extractor by tributyl phosphate (TBP) diluted in kerosene as the extractant. In the single-stage extraction experiments, effect of the aqueous ... Thus, the Table 4 Results of the single-stage extraction experiments. Time (h) Qa/Qo ¼ 1:1 ...
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The results show that the mixture of 20% triotylamine and 30% tributyl phosphate diluted kerosene oil is selective extractant of rhenium with respect to molybdenum. ... High rhenium extraction efficiencies (about 97%) were obtained when the ratio of aqueous phase to organic phase (volume) was in the range from 1:2 to 1:1. ...
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It results in a significant loss of molybdenum in flue dust along with the major portion of volatilized rhenium oxide in the outgoing dust of the roasting furnace [5,6,7]. It has been determined that such flue dust usually contains 50% of molybdenum with a significant amount of rhenium therein [ 7 ].
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Results showed molybdenum extraction efficiency is below 10 percent and rhenium extraction efficiency above 94 percent. Rhenium extraction efficiency from molybdenite roasting dust leached in water in the mixer settler using 3 counter current extraction stages (at pH = 0, O/A = 1:2, diluted TBP in Kerosene and room temperature) was reported ...
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The results showed the incredible properties of hydrophobic-DESs for selective extraction of iridium(IV) over rhodium(III) with the highest separation factor equal to 20. In the other work, tetraalkylammonium or tetraalkylphosphonium halide mixed with a monocarboxylic acid was carried out as a hydrophobic-DES for extraction of trace ...
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The possibility of selective leaching process was investigated during molybdenite flue dust leaching to recover its rhenium content. The results show that addition of alcohols to water makes the medium less favorable for molybdenum transfer …
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The low mass transfer effect of dilute solution results in low recovery efficiency of critical metal Re ions from ultralow-concentration metallurgical industrial effluents.Bubble driving was an effective measure to enhance the mass transfer in the dilute solution, and bubble flotation technology was adapted to enrich and recover metal ions.In this work, the extraction of critical …
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Dried leaf samples, three per replicates per species, were subjected to the extraction procedure described in section 2.4, employing 30 mL of H 2 O and 30 min of stirring, following the results obtained with alfalfa. Rhenium concentrations in the aqueous extracts and dried leaf samples were determined through the DMDTO spectrophotometric method ...
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And increased extraction of UO 2 (NO 3) 2 will suppress the rhenium extraction. Furthermore, an increase in rhenium extraction was also observed as a result of its co-extraction with U(VI). D Re has a value of 3 at 1 mol L −1 HNO 3 and 2.2 without uranium in the rhenium extraction as shown in Fig. 2 .
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A mixture of TBP and triotylamine (TOA) as extractant was used in alkaline solution to sperate rhenium from molybdenum, where the complete separation of rhenium from molybdenum was possible if repeated extraction and stripping were conducted [Cao et al., 2009].The results showed that the mixture of TOA (20 %) and TBP (30 %) diluted in kerosene …
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Rhenium is extracted from roasting fume and dust, leaching residue, and aqueous solution to produce a rhenium bearing solution. Subsequently, rhenium rich solution is generated by …
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[8]. Therefore, the effective extraction of molybdenum from the flue dust is equally important to the metallurgy of both refractory metals. Except for a few studies, molybdenum extraction has been given less importance than rhenium through the processing of flue dust, and molybdenum is accounted as an impurity for rhenium extraction.
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