Chemical Procedures for Rhenium Extraction from …
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- ...
Rhenium, Chemical Element
Rhenium was discovered by a German research team that included Walter Noddack (1893-1960), Ida Tacke (1896-1979) and Otto Berg. ... They see if they get the same results as those reported. In this case, the German team turned out to be half right. Scientists were able to confirm the existence of element 75. ... Extraction Ores containing ...
Effect of operational parameters and internal recycle on rhenium …
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 ...
Hydrophobic eutectic solvents for the selective solvent extraction …
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.
Rhenium extraction from pressure oxidative leaching …
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 ...
Rhenium(VII) extraction from sulfuric aqueous solutions …
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 ...
Extractive metallurgy of rhenium: a review
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 …
Selective recovery of Rhenium from industrial leach solutions …
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.
Rhenium extraction from dilute solution by precipitation …
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 …
Extraction of Rhenium With Trialkylbenzylammonium …
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 ...
Liquid-liquid extraction of rhenium (VII) from hydrochloric …
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.
Study of the Possibility of Rhenium Extraction and …
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
Selection of crud processing methods with complex extraction …
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 …
Extraction of Rhenium from Lead Sludge of …
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 ...
On the uptake of rhenium by plants: Accumulation and recovery from
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 ...
Development of a Method for Reprocessing Technogenic Lead Production
The results of an experimental study into the reduction smelting of rhenium-containing cyclone dust obtained from lead production are presented. The optimal dust processing modes characterized by the extraction of water-soluble rhenium (80–84.3%) and water-insoluble arsenic compounds (65–70%) into sodium sulfate slag are established. Thermogravimetric …
Substantiation of New Reagent Compositions for the Effective Extraction …
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 …
Hydrometallurgical Extraction of Molybdenum and …
[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.
Efficient extraction of rhenium through demulsification of …
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 ...
Chemical Procedures for Rhenium Extraction from …
Our results show that the HF desilicification elevated the rhenium extraction efficiency (by 9–15%) evidenced from basaltic and andesitic rocks (e.g., BHVO-2, TDB-1 and AGV-2). This implies that a small proportion of Re resides in silicate phases.
Technetium(VII) and Rhenium(VII) Extraction by a New …
Technetium(VII) and Rhenium(VII) Extraction by a New Diamide Reagent, 2,2'-(Imino)bis(N,N-dialkylacetamide) (IDAA) Yuji SASAKI,*1 Yumi SUGO,1 Morihisa SAEKI,1 Yasuji MORITA, 1 and Akira OHASHI2 1 Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan 2 Department of Chemistry, Ibaraki Univeraity, Bunkyo 2-1-1, …
Hydrometallurgical Extraction of Molybdenum and Rhenium …
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 ].
Review of rhenium extraction and recycling technologies …
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 …
Diluent effects in the solvent extraction of rhenium (VII) …
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 ...
Extractive metallurgy of rhenium: a review
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 …
Chemical Procedures for Rhenium Extraction from Geological Samples
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 ...
Rhenium extraction from pressure oxidative leaching …
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 …
Extractive metallurgy of rhenium: a review
Results showed that 98% of the aqueous rhenium was recoverable, and allowed for the production of a 98% pure rhenium precursor product using solvent extraction
Recovery of Molybdenum and Rhenium from Mo Concentrate
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 ...
Introduction and calculation of interaction coefficients in …
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 ...