Экстракционное извлечение рения из модельных и технологических растворов третичными аминами и спиртами различного строения

Extraction of rhenium by tertriary amines and aliphatic alcohols of various structure from acid solutions has been studied. The technology of complex extraction recycling of striping acid of copper – nickel production, that provides extraction of rhenium, has been proposedИзучена экстракция рения(VII) третичными аминами и алифати- ческими спиртами различного строения из кислых растворов. Предложена схема комплексной экстракционной переработки промывной кислоты медно-никелевого производства, обеспечивающая извлечение рения

Mechanism and Kinetics of Iron Extraction from High Silica Boehmite–Kaolinite Bauxite by Hydrochloric Acid Leaching

The chemical and mineral compositions of bauxite recovered from the Severoonezhsk Bauxite Mine (Arkhangelsk region, Russia) were studied by XRD, ICP-OES, TG/DSC, SEM, TEM, and Mössbauer spectroscopy. The iron-containing minerals of the bauxites were found to comprise alumogoethite (α-Fe1–xAlxOOH), alumohematite (α-(Fe1–xAlx)2O3), alumoakaganeite (β-Fe1–xAlxO(OH,Cl)), and chromite (FeCr2O4). The efficiency of Fe extraction from the bauxite by HCl leaching was 82.5% at 100 °C, HCl concentration of 10%, solid/liquid ratio of 1:10, and the process duration of 60 min, with aluminum loss from the bauxites below 4.5% of the total Al contents in the bauxite. Analysis of the kinetics of the iron leaching process proved diffusion to be the limiting stage of the process at 90–100 °C. Bauxite residue after leaching presented traces of α-Fe1–xAlxOOH and β-Fe1–xAlxO(OH,Cl), and most of the iron content was in the FeCr2O4. In bauxite residue after HCl leaching, in addition to iron oxide, the contents of chromium and calcium oxides significantly decreased. The iron chloride liquor after leaching contained the rare earth elements (REE) of 6.8 mg/L Sc, 4.1 mg/L Ce and 2.3 mg/L Ga. © 2021 The Nonferrous Metals Society of China.This research was funded by a Ministry of Science and Higher Education of the Russian Federation (scientific topic No. 0137-2019-0023). The authors would like to appreciate the assists from The Center for Collective Use Testing Analytical Center of the JSC “Scientific-Research Institute of Chemical Technology” and personally to Natalya Ognevskaya for chemical analysis of solid and liquid samples

International Asteroid Warning Network Timing Campaign : 2019 XS

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The IXPE View of GRB 221009A

We present the IXPE observation of GRB 221009A, which includes upper limits on the linear polarization degree of both prompt and afterglow emission in the soft X-ray energy band. GRB 221009A is an exceptionally bright gamma-ray burst (GRB) that reached Earth on 2022 October 9 after traveling through the dust of the Milky Way. The Imaging X-ray Polarimetry Explorer (IXPE) pointed at GRB 221009A on October 11 to observe, for the first time, the 2–8 keV X-ray polarization of a GRB afterglow. We set an upper limit to the polarization degree of the afterglow emission of 13.8% at a 99% confidence level. This result provides constraints on the jet opening angle and the viewing angle of the GRB, or alternatively, other properties of the emission region. Additionally, IXPE captured halo-rings of dust-scattered photons that are echoes of the GRB prompt emission. The 99% confidence level upper limit to the prompt polarization degree depends on the background model assumption, and it ranges between ∼55% and ∼82%. This single IXPE pointing provides both the first assessment of X-ray polarization of a GRB afterglow and the first GRB study with polarization observations of both the prompt and afterglow phases

Solvent extraction of rhenium from model and process solutions by tertiary amines and various spirits

Extraction of rhenium by tertriary amines and aliphatic alcohols of various structure from acid solutions has been studied. The technology of complex extraction recycling of striping acid of copper – nickel production, that provides extraction of rhenium, has been propose

Динамика изменения численности русского населения в Западном Причудье (Эстония) в XVII–XIX веках и проблема старообрядчества

In this paper, changes in the number of inhabitants in Estonia as well as the Russians in the villages on the western coast of Lake Chudskoe (Western Prichudye) in the period from the end of the 16th to the end of the 19th centuries have been traced. The data obtained from the inspections, lists of Lutheran parishes, the estimations, the analysis of toponymy of 16th century and dialect peculiarities of the Russians of Western Prichudye made it possible to conclude that the main body of Russian population of the coastal villages were the descendants of Russians that had lived in the Northern and Western Prichudye long before the split of the Orthodox Church in Russia took place. As it is read in the reports to the Governor General in the 19th century, the Old Belief without the priest spread over Prichudye due to vigorous activity of Feodosii Vasiliev adepts among local Russians, and not as a result of the resettlement of a considerable number of Old Believers from Russia as it was supposed earlier. The assumption is made that the origin of the word vene used by western Finns to call the Russians is a derivative from the word словене

Chloride atomic-layer chemical vapor deposition of TiO2 with a chloride pretreatment of substrates

A procedure for changing the course of the atomic-layer chemical vapor deposition (ALCVD) growth of TiO2 from TiCl4 and H2O on amorphous SiO2 substrates/underlayers at low temperatures is proposed. The changes are characterized by the real-time incremental dielectric reflection measurements and post-growth spectrophotometry and reflection high-energy electron diffraction measurements. In the procedure, an ultrathin layer of the material is deposited and, subsequently, in situ inhomogeneously etched in the TiCl4 flow, both steps being performed at a temperature above 350°C. As a result, an ultrathin microrough mixed amorphous/anatase-phase surface layer is created. By using this layer as a seed layer, the crystalline-growth temperature of the material is reduced. So anatase (mixed with amorphous phase) TiO2 thin films on SiO2 substrates at 125°C are, for the first time, grown. The films are shown to be depth-inhomogeneous. The upper part of the films, when they are thicker, is well texture

Optical and luminescence characterization of LiBaAlF6 single crystals

Far ultraviolet optical, luminescence excitation and pulse cathodoluminescence spectroscopy methods were used to determine the electronic structure properties of undoped single crystals of LiBaAlF6 (LBAF). The spectrum of the refraction index in the ultraviolet–visible range was recorded. The photoluminescence excitation spectroscopy was carried out for both the excitonic (4.3 eV) and fast vacuum ultraviolet (6.6 eV) emission bands of LBAF single crystals at 10 K. Modeling of the photoluminescence excitation spectra for excitonic emission was performed to characterize the low-energy tail of the host absorption of LBAF single crystals. The pulse cathodoluminescence spectroscopy method was used to characterize the fast vacuum ultraviolet (6.6 eV) emission band and proof its origination from the radiative core-valence transitions F− 2p →→ Ba2+ 5p

Utilization of Converter Slag from Nickel Production by Hydrometallurgical Method

The possibility of hydrometallurgical processing of converter slag from nickel production aimed at integrated use of mineral raw materials and environmental protection is shown. The scheme of hydrometallurgical processing of slag using hydrochloric acid is proposed. The method involves leaching the slag with hydrochloric acid in the presence of ferric ions. The high values of iron and nonferrous metals extraction into the leaching solution are achieved during hydrochloric acid leaching. Silicon is concentrated in an insoluble residue. Liquid extraction was used to extract iron from hydrochloric acid leaching solutions. Silica-containing residues can be successfully used in the construction industry

Niejednorodność składników zeszklonego żużla pochodzącego z procesu hutniczego rud niklu z Półwyspu Kolskiego (Rosja)

The problem of the disposal of metallurgical slags in the copper-nickel industry also remains open in the Kola Peninsula area, where this kind of exploitation and processing of sulphide Cu-Ni deposits is conducted. The urgent need is to reuse the waste slag heaps through the effective manner of their use based on our available technologies. The slag obtained after processing sulphide copper-nickel ores in the Kola Peninsula contains about 4 wt.% of the ore. The chemical and mineral composition of the slag plays a key role when considering the possibility of its re-use in the context of environmental nuisance. The line of processing Cu-Ni sulfide deposits from the slag proposed by the authors is based on the ability to change the slag phase composition by its oxidation and reduction processes for the enrichment of ore mineralization for reuse.Kwestia utylizacji żużli hutniczych przemysłu miedziowo-niklowego pozostaje otwarta również na Półwyspie Kolskim, gdzie jest prowadzona eksploatacja i obróbka siarczkowych złóż Cu-Ni. Pilną potrzebą jest ponowne wykorzystanie hałd. W tym celu, przy zastosowaniu dostępnych technologii, poddaje się je efektywnemu przetworzeniu. Podczas przetwarzania siarczkowych rud miedzi z niklem w żużlu pozostaje około 4% wag. minerałów rudy. O ponownym wykorzystaniu żużla decyduje jego chemiczny i mineralny skład, który nie może zagrażać naturalnemu środowisku. Zaproponowany przez autorów projekt linii przetwarzania osadów siarczków Cu-Ni z żużla zakłada uzyskanie zmiany składu fazowego żużla w wyniku utleniania i redukcji w trakcie obróbki cieplnej, koniecznej do wzbogacenia mineralizacji rudnej, a tym samym do jej ponownego użycia