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Tytuł:
A successful operational initiative in copper oxide flotation: Sequential sulphidisation-flotation technique
Autorzy:
Asadi, Moharram
Soltani, Faraz
Mohammadi, Mohammad Reza Tavakoli
Khodadadi, Darban Ahmad
Abdollahy, Mahmoud
Powiązania:
https://bibliotekanauki.pl/articles/110770.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper oxide
sulphidisation
flotation
Opis:
One of the main challenges in the copper oxide processing industry is implementation of a flotation method to reduce operating costs. Sulphidising flotation is the most common used technique in which a sulphidisation agent is used to sulphidise the surface of the oxide minerals. In this research, the mentioned technique was used sequentially for the concentration of silicate-carbonate ore containing 3.1% Cu (malachite). The presence of 39% Cu in -38 μm size fraction (fine particles) of feed led to poor grades and recoveries in the initial tests. The addition of sodium sulfide and subsequent flotation at three sequential stages was identified as a successful operational initiative to solve this problem in the following tests. The dosages of 1500, 1567 and 100 g/Mg of sodium silicate, sodium sulfide and potassium amyl xanthate, respectively, the conditioning time of 5 min for sulphidisation and pH=9.72 were chosen as optimum operational conditions using central composite design (CCD) method of experiments design. The rougher concentrate with 9.28% grade and 81.15% recovery was obtained under these conditions. The grade of obtained concentrate was reached to 24% in the cleaner step. The total recovery of both steps was over 74%.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 2; 356-369
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anodic growth of copper oxide nanostructures in glow discharge
Autorzy:
Breus, A.
Abashin, S.
Lukashov, I.
Serdiuk, O.
Powiązania:
https://bibliotekanauki.pl/articles/2201134.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
nanotechnology
plasma synthesis
copper oxide nanostructure
glow discharge
nanotechnologia
synteza plazmowa
nanostruktura tlenku miedzi
wyładowanie jarzeniowe
Opis:
Purpose: Application of plasma glow discharge to copper oxide nanostructure growth is studied. The simplicity of the proposed technique may be beneficial for the development of new plasma reactors for large-scale production of diverse metal oxide nanostructures. Design/methodology/approach: Copper sample was placed on anode of a setup designed to ignite plasma glow discharge. The proposed approach allows eliminating the negative effects of ion bombardment, like sputtering and generation of defects on a surface of the growing nanostructures, but preserves the advantages of thermal growth. The growth process was explained in terms of thermal processes interaction occurring on a surface of the anode with the glow discharge plasma. Findings: Plasma treatment resulted in generation of reach and diverse nanostructures that was confirmed by SEM images. Nanowire-like, flower-like, anemone-like nanostructures and nanodisks composed into the nanoassemblies are observed; the nanostructures are associated with microbabbles on CuO layer. These findings allow concluding about the possible implementation of the proposed method in industry. Research limitations/implications: The main limitation is conditioned by the lack of heat supplied to the anode, and absence of independent control of the heat and ion fluxes; thus, the additional heater should be installed under the anode in order to expand the nomenclature of the nanospecies in the future studies. Practical implications: High-productivity plasma process in copper oxide nanostructures synthesis was confirmed in this research. It may be applied for field emitter and supercapacitor manufacturing. Originality/value: Oxide nanostructure synthesis is conducted by use of a simple and well-known glow discharge technique in order to expand the production yield and diversity of nanostructure obtained in the processes of thermal growth.
Źródło:
Archives of Materials Science and Engineering; 2022, 113, 3; 24--33
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Próba zwiększenia własności przeciwzatarciowych Smaru Maszynowego 2
Attempt at enhancing anti-seizing properties of Machine Grease 2
Autorzy:
Czupryk, W.
Powiązania:
https://bibliotekanauki.pl/articles/189143.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Smar Maszynowy 2
tlenki miedzi
redukacja tlenku
Auger Electron Spectroscopy (AES)
Machine Grease 2
copper oxide
oxide reduction
Auger electron spectroscopy (AES)
Opis:
Smar Maszynowy 2 charakteryzuje się zbyt niskimi własnościami przeciwzatarciowymi w zastosowaniu do smarowania łożysk tocznych. Cechę tę potwierdzają dane literaturowe i wyniki badań własnych wykonanych na aparacie czterokulowym. W celu zwiększenia własności przeciwzatarciowych Smaru Maszynowego 2 wprowadzono do jego objętości mieszankę tlenku miedzi i gliceryny z alkoholem etylowym. Badania miały na celu dać odpowiedź na pytanie, czy w warunkach dużych nacisków, zmiennych naprężeń i wysokich krótkotrwałych temperatur w obszarze kontaktu tlenek miedzi będzie redukowany do miedzi metalicznej, która będzie spełniała rolę smaru stałego. Badania wykonano na aparacie czterokulowym w trzech następujących po sobie seriach. Każda z nich trwała 60 sekund. Nacisk był stały i wynosił 1472 N. Po wykonaniu badań obliczono graniczne obciążenie zatarcia G0Z. Stwierdzono znaczny wzrost wskaźnika G0Z dla smarów z wymienionymi wcześniej dodatkami: G0Z dla Smaru Maszynowego 2 wynosił 529 [N/mm2], a dla innych składów dodatków wprowadzonych do smaru zawierał się w przedziale 900–1736 [N/mm2]. W celu potwierdzenia zjawiska redukcji tlenku miedzi do miedzi metalicznej wykonano badania powierzchniowe i wgłębne z użyciem spektrometrii AES. Wyniki analiz potwierdziły występowanie w warstwie powierzchniowej i warstwach głębiej zlokalizowanych miedzi metalicznej. Obecność warstewki metalicznej miedzi na ścieżce kontaktu spełniającej rolę smaru stałego skutkowała zwiększeniem odporności na zatarcie Ft trzy-, a nawet czterokrotnie w stosunku do tego samego wskaźnika dla Smaru Maszynowego 2.
The anti-seizing properties of Machine Grease 2 are too poor to ensure the proper lubrication of rolling bearings. This is confirmed by research publications and the results of the author's tests carried out using the four-ball EP tester. In order to enhance the anti-seizing properties of Machine Grease 2, a mixture of copper oxide, glycerine, and ethyl alcohol was introduced into its volume. The aim of the tests was to find out if, under high pressures, variable stresses and short-duration temperatures in the contact region cause the copper oxide to be reduced to metallic copper functioning as grease. The tests in the four-ball EP tester were carried out in three consecutive series, each lasting 60 seconds. The pressure remained constant and amounted to 1472 N. After the tests, the limit of the seizure load G0Z was calculated. Index G0Z was found to be considerably higher for lubricants containing the above additives, amounting to 529 [N/mm2] and 900–1736 [N/mm2] for Machine Grease 2 and lubricating compositions containing the mixture of copper oxide, glycerine and ethyl alcohol, respectively. Due to the presence a metallic copper film on the contact path, seizure resistance Pt increased three to even four times in comparison with this index for Machine Grease 2.
Źródło:
Tribologia; 2012, 3; 35-44
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of Copper-based Multi-walled Carbon Nanotube Composites
Autorzy:
Domagała, K.
Borlaf, M.
Kata, D.
Graule, T.
Powiązania:
https://bibliotekanauki.pl/articles/355954.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MWCNT
water treatment
copper
cuprous oxide
cupric oxide
Opis:
In this study, the synthesis of copper-based multi-walled carbon nanotube compositesis described. Over the last years, carbon nanotubes (CNTs) have been widely used in many scientific research fields and have found applications in several sectors, e.g. for water treatment. This work focuses on combining the exceptional characteristics of CNTs, such as high specific surface areaand antibacterial properties, with the antimicrobial / antivirus features of copper oxides. The influence of synthesis parameters and thermal treatment on the final product was studied. Copper leakage was evaluated at both pH 5 and pH 7, confirming the possibility of applying Cu-based MWCNT composites in water filtration systems.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 157-162
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Properties of Graphene Oxide–Copper Composites
Autorzy:
Duda, P.
Muzyka, R.
Robak, Z.
Kaptacz, S.
Powiązania:
https://bibliotekanauki.pl/articles/351676.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composites of copper
graphene oxide
surface microgeomety
tribological properties
Opis:
Due to their characteristics, sintered Cu-C composites are materials used in electrical equipment. These characteristics include high electrical conductivity, thermal conductivity and excellent resistance to abrasion. Currently, graphite nanopowder is used successfully as a carbon material. Metal-graphite, which is created on its basis, exists in different proportions of graphite to metal. A larger graphite content has a positive effect on smaller wear of commutators and rings. In contrast, a material with a higher copper content is used at high current densities. An example of such machines is a DC motor starter characterized by low voltage and large current. Tribological properties of Cu-C composites depend on the form of carbon they include. Owing to the capability to manufacture graphene, it has become possible to produce composites with its content. The present study tested the effect of a graphene oxide content on tribological properties in contact with steel. Tests were conducted on a ball-on-disk apparatus in conditions of dry friction. Microscopic observation was performed on the Hitachi SU70 field emission electron microscope. EDS analyses were performed using the Thermo Scientific X-ray Microanalysis system. Disk wear and surface geometrical structure parameters (SGP) of the samples after tribological tests were determined on the basis of measurements made on the Talysurf 3D contact profilometer from Taylor Hobson.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 863-868
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of CuO Nanoparticles by the Chemical Liquid Deposition Method and Investigation of Its Catalytic Effect on the Thermal Decomposition of Ammonium Perchlorate
Autorzy:
Eslami, A.
Juibari, N. M.
Hosseini, S. G.
Abbasi, M.
Powiązania:
https://bibliotekanauki.pl/articles/358128.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
copper oxide nanoparticles
ex-situ growth
ammonium perchlorate
thermal decomposition
chemical liquid deposition
Opis:
Copper oxide nanoparticles have been synthesized by the chemical liquid deposition method and characterized by means of X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The XRD and SEM results showed that the particle size was between 50 nm and 70 nm. Ammonium perchlorate (AP)-CuO nanostructures have been prepared by ex-situ mixing of AP and CuO nanoparticles, while AP/CuO nanocomposites have been obtained by in-situ growth of nano CuO on the surface of AP. The effect of the nanoparticles on the thermal decomposition of AP has been examined by differential scanning calorimetery (DSC) and thermogravimetric analysis (TGA) methods. The results showed that the ex-situ prepared nanoparticles had better catalytic activity than the in-situ prepared ones. The effect of the synthesized nanoparticles on the thermal decomposition of AP in experiments with a AP to CuO ratio of 98:2 was as follows: with the ex-situ prepared experiments, the decomposition temperature decreased from 428 °C to 348 °C and the heat released increased from 344 J·g−1 to 1432 J·g−1, while those with the in-situ prepared samples exhibited 341 °C and 1317 J·g−1, respectively.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 1; 152-168
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the quality of titanium oxide and copper oxide layers by means of optical microscopy
Autorzy:
Głuszek, A.
Sawicka-Chudy, P.
Wisz, G.
Sibiński, M.
Cholewa, M.
Powiązania:
https://bibliotekanauki.pl/articles/101772.pdf
Data publikacji:
2018
Wydawca:
Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
Tematy:
titanium oxide
copper oxide
optical microscopy
histograms
Opis:
The aim of this paper is to analyse high-resolution optical images of the surface layers of titanium oxide and copper oxide. The materials were produced using the PREVAC Modular Platform for layer deposition located at the University of Rzeszów. Images with a magnification of 50x were obtained using an optical microscope. On the basis of the results obtained, the quality of the layers was evaluated based on the image analysis. The quantitative method of analysis was applied, as a result of which the conditions of the manufacturing process for which the obtained layers had the highest homogeneity were indicated. The minimum range of grey shade counting was from 65 to 150 and the maximum range from 135 to 220. The standard deviation was from 8 to 40%.
Źródło:
Energy Policy Studies; 2018, 1 (2); 39-51
2545-0859
Pojawia się w:
Energy Policy Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D block modelling of the Sin Quyen IOCG deposit, North Vietnam
Autorzy:
Hao, Duong Van
Nguyen, Dinh Chau
Klityński, Wojciech
Zygo, Władysław
Nowak, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/27310153.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
North Vietnam
iron oxide copper deposits
3D model
resources
deposit development
Opis:
The IOCG Sin Quyen deposit is located in the Red River shear zone of North Vietnam. The ore bodies are known as hydrothermal veins and are hosted in Proterozoic metapelite. A block modelling approach was used to build a 3D model of the ore bodies. An analysis was carried out on Surfer 11 computer software using the archival data recorded from several dozen boreholes distributed within the study area, as well as data obtained from the mineral and chemical analysis of 50 samples collected recently in the deposit. The ore bodies generally trend in a NW-SE direction with an average azimuth of 107° and dip of around 70°.The Cu content in the ore bodies is inhomogeneous. In the bed extension direction, the exponential correlation of Cu concentration in ore bodies is recognized within 2,500 m, while in the direction perpendicular to the bed strike, the exponential dependence is observed on 500 m of distance. The high-grade mineralisation of copper within the ore bodies is often at the altitude interval from ∼100 m to ∼150 m above sea level (asl). These bodies are also rich in uranium and gold bearing minerals. The total resources of Cu, U and Ag were estimated and amount to 361,000; 12.7 and 11.87 tonnes respectively. The model indicates the downward extension of some ore bodies to below 300 m beneath the ground surface.
Źródło:
Geology, Geophysics and Environment; 2023, 49, 2; 175--195
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Copper (II) Oxide particles as Adsorbent for Removal of Alkali Blue; Isotherm and Kinetic Studies
Autorzy:
Ibrahim, M. A.
Ibrahim, M. B.
Powiązania:
https://bibliotekanauki.pl/articles/1158766.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Adsorption
Copper (II) Oxide particles
FTIR
Isotherm
Kinetics
Opis:
Adsorption behaviour of copper (II) oxide particles (CuO-Ps) for the removal of Alkali Blue (AB) was studied. Different adsorption variables such as contact time, initial concentration and pH for the adsorption process were investigated by batch adsorption studies. FTIR was carried out to determine the functional groups present at the surface of the particle with functional groups such as –OH, C=C, C-H, C≡C detected. The percentage removal and optimum contact time for the removal of AB was 84.8% at 10 min. The experimental isotherms data were analyzed using Langmuir, Temkin, Freundlich and Dubinin-Radushkevich (D-R) isotherms and it was observed that AB fits closely to Langmuir with R2 value of 0.884. Kinetics studies shows that the adsorption process fits better to pseudo-second order with the experimental values of qe 4.242 been closer to the calculated values of the qe 4.108. Effect of pH shows that it adsorb better at the initial pH of 5.30. Lower value of mean square energy of 0.707 kJ/mol indicates that the adsorption process is physical. The results indicated that copper (II) oxide particle can be used as a low-cost adsorbent for the removal of AB from aqueous solutions.
Źródło:
World Scientific News; 2018, 114; 208-217
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antiviral Activities of Cu2+ Ions in Viral Prevention, Replication, RNA Degradation, and for Antiviral Efficacies of Lytic Virus, ROS-Mediated Virus, Copper Chelation
Autorzy:
Ishida, Tsuneo
Powiązania:
https://bibliotekanauki.pl/articles/1177808.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Capsid protein
Copper chelation
Copper homeostasis
Copper oxide nanoparticles
Cu2+ and Cu1+ ions
DNA/RNA virus
HSV
ROS
Viral replication
mRNA degradation or decay
Opis:
Copper has been known for decades that marked changes of micronutrient homeostasis in the host are accompanied by infection or inflammation. Copper levels in the serum are significantly elevated in response to inflammation that copper accumulates at sites of inflammation. Easily oxidized copper oxide nanoparticles (CuONPs) are widely used as catalysts that the ability of CuONPs to reduce bacterial population and virus application is enhanced. The mechanism of copper-mediated inactivation of herpes simplex virus (HSV) is by which cupric ions oxidatively damage biomolecules. Virus-mediated subjugation and modulation of host lipids during infection that the life cycle of most viruses proceeds through a series of basic steps: binding and internalization, fusion, uncoating, of the viral genome, its replication, assembly of new particles, and budding or release of the newly made viruses. The HIV-1 protein Vpu is an 81-amino-acid (16-kDa) type I which the presence of Vpu leads to the degradation of BST-2 via an endosome-lysosome degradation pathway. Oxidative degradation by a Cu-metalloenzyme, and ubiquitin-mediated degradation of cellular proteins were exploited. Copper can disrupt the lytic cycle of the Coccolithovirus. Lysins represent a novel class of anti-infectives derived from bacteriophage which lysins are bacterial cell wall hydrolytic enzymes that selectively and rapidly kill specific bacteria. Regarding copper induced cellular toxicity, several mechanisms have been proposed based on the formations of ROS by free Cu ions as cupric and cuprous ions can participate in redox reactions. ROS (O2ˉ,･OH, OHˉ), Cu+ and H2O2 play the important roles for viral inactivations. Thujaplicin-copper chelates inhibit influenza virus-induced apoptosis. Pyrrolidine dithiocarbamate as a metal ion binding agent inhibits the activity of the viral proteases of polyprotein processing and RNA replication of HRV. Chelation enables metals are capable of ligand scavenging via complexation, since reverse transcriptase enzyme inhibits the growth and replication of RNA tumor viruses. Thus, copper complex and copper chelation enhance antiviral efficacy.
Źródło:
World Scientific News; 2018, 99; 148-168
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological properties of Cu based composite materials strengthened with Al2O3 particles
Autorzy:
Kaczmar, J.
Granat, K.
Grodzka, E.
Kurzawa, A.
Powiązania:
https://bibliotekanauki.pl/articles/381312.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal matrix composite
copper
aluminium oxide particles
tribological properties
wear resistance
friction coefficient
Pin-on-disc tester
kompozyt metalowy
miedź
tlenek aluminium
właściwości tribologiczne
odporność na ścieranie
współczynnik tarcia
Opis:
In the present work copper was strenghtened with 20 and 30 vol. % of alumina particles characterized by diameter of 3-6μm. The copper based composite materials were manufactured by the squeeze casting method. Preheated preforms made from Al2O3 particles were placed in the desired place in the heated cast die and the squeeze casting process with liquid copper was performed applying the infiltration pressure of 90MPa and pressure was kept for 10-15s until solidification was complete. The microstructure and physical properties: Brinell hardness (HBW) and density were characterized. Metallografic examinations showed that alumina particles were uniformly distributed in the copper matrix. Hardness of 208 HBW for composite materials containing 30 vol.% of particles was achieved. Wear investigations were performed applying the tribological pin-on-disc tester. Friction forces between copper based composite materials containing 20 and 30 vol. % of Al2O3 particles and cast iron were registered and wear was determined on the base of the specimen mass loss after 1.0, 3.5 and 8.5 km friction distance.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2s; 33-36
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacja komputerowa procesu redukcji ciekłego żużla
Computer simulation of process in molten oxide slag reduction
Autorzy:
Kalisz, D.
Rzadkosz, S.
Piękoś, M.
Powiązania:
https://bibliotekanauki.pl/articles/381577.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
symulacja komputerowa
ciekły żużel
tlenek miedzi
równowaga termodynamiczna
computer simulation
liquid slag
copper oxide
thermodynamic equilibrium
Opis:
Praca zajmuje się termodynamiczną analizą elementarnych procesów chemicznych zachodzących podczas redukcji żużla zawierającego tlenek miedzi. Redukcja żużla zachodzi przez zastosowanie reduktora w postaci stałej - węgla, gazowej - tlenek węgla lub węgla rozpuszczonego w ciekłym żużlu. Obecna praca rozpatruje dwa procesy chemiczne: reakcję ciekłego żużla z węglem oraz z tlenkiem węgla. Korzystając z komercyjnego oprogramowania FATSage obliczono w warunkach równowagi termodynamicznej składy faz dla układów: stały węgiel – ciekły żużel - stop Cu–Fe–Pb – faza gzowa oraz gazowy CO – ciekły żużel – stop Cu–Fe–Pb – faza gazowa. Symulację prowadzono dla temperatury procesu 1500, 1600, 1700 K. Gazowe produkty reakcji redukcji i stop Cu–Fe–Pb były usuwane z układu w każdym kroku obliczeniowym. Uzyskane wyniki obliczeń wykazały, że redukcja za pomocą węgla odgrywa zasadniczą rolę w procesie odzysku miedzi.
The present work deals with thermodynamic analysis of process of the reduction of molten slag containing copper oxide. Reduction of liquid slag is possible with solid carbon, gaseous carbon oxide. and carbon dissolved in liquid slag. This work studied two chemical reactions of liquid slag containing copper oxide: with solid carbon and gaseous CO. Thermodynamic equilibrium in the system: solid carbon – liquid slag – metallic alloy Cu–Fe–Pb – gas and gaseous CO – liquid slag – metallic Cu–Fe–Pb – gas were calculated by means of FACTSage software. The simulation of the progress of reduction process at 1500, 1600, 1700K was obtained under assumption that the gaseous reduction products and metallic alloy Cu–Fe–Pb were removed from consideration after each simulation step. The calculation revealed that consumption of reducing agent is much higher in the case of CO reduction. The effect of simulation suggested, that reduction with solid carbon is the predominant mode of industrial process.
Źródło:
Archives of Foundry Engineering; 2012, 12, 1s; 91-96
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie zawartości miedzi w strumieniach technologicznych procesu wytwarzania poli(tlenku fenylenu)
Analysis of copper content in the poly(phenylene oxide) production process streams
Autorzy:
Kolasa, D.
Ratajczak, W.
Talma-Piwowar, M.
Krakowiak, J.
Majewska, E.
Polarczyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/947148.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
poli(tlenek fenylenu)
skład strumieni technologicznych
oznaczanie miedzi
mineralizacja próbek
poly(phenylene oxide)
process streams composition
determination of copper
sample digestion
Opis:
Przedstawiono wyniki oznaczania zawartości miedzi w strumieniach technologicznych pochodzących z procesu otrzymywania poli(tlenku fenylenu) (PPO) metodą polimeryzacji strąceniowej 2,6-dimetylofenolu z użyciem soli miedzi(II) jako kokatalizatora. Techniką FAAS (płomieniowa absorpcyjna spektrometria atomowa) badano mineralizaty próbek pochodzących z węzła odzysku rozpuszczalników (metanol lub etanol, toluen) i z węzła odzysku składników układu katalitycznego [jony miedzi(II), morfolina]. Zaproponowano procedurę analityczną obejmującą, na etapie przygotowania roztworów do badań, mineralizację próbek za pomocą nowoczesnego systemu do roztwarzania mikrofalowego Ultra WAVE (Milestone). Metoda ta (w połączeniu z techniką FAAS) pozwala na szybkie i sprawne oznaczanie zawartości miedzi w ciekłych próbkach z matrycą organiczną (metanol/etanol – toluen, morfolina) i wodno-organiczną.
Results of copper determination in process streams coming from the poly(phenylene oxide) (PPO) production by precipitation polymerization of 2,6-dimethylphenol using the copper(II) salt as a co-catalyst have been presented. A microwave-assisted sample preparation analytical procedure for the determination of copper in stream samples from the organic solvents (methanol or ethanol, toluene) and the catalyst components [copper(II) ions, morpholine] recovery nodes using a modern Milestone Ultra WAVE digestion system combined with the FAAS technique has been proposed. The method is useful for quick and efficient determination of copper in liquid samples with organic (methanol/ethanol – toluene, morpholine) mixtures and aqueous-organic matrix.
Źródło:
Polimery; 2018, 63, 4; 290-296
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Copper Doped Neodymium Nickelate Oxide as Cathode Material for Solid Oxide Fuel Cells
Autorzy:
Lee, K. J.
Choe, Y-J.
Hwang, H-J.
Powiązania:
https://bibliotekanauki.pl/articles/351292.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solid oxide fuel cells
copper
electrical conductivity
excess oxygen
Opis:
Mixed ionic and electronic conducting K2NiF4-type oxide, Nd2Ni1-xCuxO4+δ (x=0~1) powders were synthesized by solid state reaction technique and solid oxide fuel cells consisting of a Nd2Ni1-xCuxO4+δ cathode, a Ni-YSZ anode and ScSZ as an electrolyte were fabricated. The effect of copper substitution for nickel on the electrical and electrochemical properties was examined. Small amount of copper doping (x=0.2) resulted in the increased electrical conductivity and decreased polarization resistance. It appears that this phenomenon was associated with the high mean valence of nickel and copper and the resulting excess oxygen (δ). It was found that power densities of the cell with the Nd2Ni1-xCuxO4+δ (x=0.1 and 0.2) cathode were higher than that of the cell with theNd2NiO4+δ cathode.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 625-628
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction of vanadium and potassium compounds from the spent vanadium catalyst from the metallurgical plant
Autorzy:
Mazurek, K.
Powiązania:
https://bibliotekanauki.pl/articles/779744.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
kwas siarkowy
tlenek siarki
katalizatory wanadu
ługowanie
wanad
potas
miedź
cynk
arsen
ołów
XRF
sulfuric acid
sulfur oxide
spend vanadium catalysts
leaching
recovery
vanadium
potassium
copper
zinc
arsenic
lead
Opis:
A spent vanadium catalyst, from the plant of metallurgical type, was leached in a sulfuric acid solution to recover vanadium and potassium compounds. The effect of time, temperature, concentration of acid, catalyst particle size and phase ratio was studied. Additionally the concentration of iron, copper, zinc, arsenic and lead compounds was determined. The flow sheet for the proposed process of spent vanadium catalyst leaching is presented.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 2; 49-53
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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