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Tytuł:
Magnetic filtration/adsorption process for Snake River Plain Groundwater Treatment
Autorzy:
Cotten, G.
Eldredge, H.
Navratil, J.
Powiązania:
https://bibliotekanauki.pl/articles/148582.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
groundwater
magnetic filtration
magnetite
Opis:
A magnetic filtration/adsorption process has been evaluated for development for groundwater treatment at the Idaho National Engineering and Environmental Laboratory (INEEL). The process uses inexpensive magnetite (FeOźFe2O3) in a supported mode surrounded by an external magnetic field. Prior studies have been shown to remove actinides and fission products in laboratory studies. This research has focused on supporting magnetite in an economical manner that promotes both magnetic filtration/adsorption of metal species and satisfactory water flow. The process utilizes the natural metal ion adsorptive properties of magnetite as well as the High Gradient Magnetic Separation (HGMS) effect for removing metal colloids and submicron particles. Results are presented on scoping studies for developing the process for groundwater treatment at the INEEL.
Źródło:
Nukleonika; 2003, 48, 1; 17-23
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhanced effect of fine magnetite on the flotation performance of fine hematite in sodium oleate system
Autorzy:
Pei, Bin
Luo, Ximei
Yang, Wen
Wei, Dayong
Li, Chao
Wang, Yunfan
Powiązania:
https://bibliotekanauki.pl/articles/2146908.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
magnetite
hematite
flotation
magnetic aggregation
Opis:
In this work, the effect of magnetite with different particle sizes on the flotation performance of both coarse and fine hematite particles were investigated by using sodium oleate as a collector. The results showed that the magnetite particles with different particle sizes showed a negative effect on hematite (-106+45 μm) recovery, but the addition of magnetite with the same particle sizes as hematite during the direct flotation of -45 μm hematite was beneficial to improve the recovery of micro-fine hematite and the Fe grade of concentrate. The finer the magnetite particle was, the more obvious the agglomeration effect of hematite was. Therefore, the beneficial effect could be achieved by adjusting the particle sizes of particles. Moreover, sodium oleate was beneficial to promote the agglomeration of micro-fine magnetite and hematite. The results from the microscopic analysis, laser particle size analysis, and EDLVO calculation proved that there was an effective aggregation between fine magnetite and fine hematite particles, which increased the apparent size of hematite particles and the probability of the mineral particles adhering to bubbles, thus improving the hematite recovery.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 149673
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photon attenuation properties of concretes containing magnetite and limonite ores
Autorzy:
Gur, A.
Artig, B.
Cakir, T.
Powiązania:
https://bibliotekanauki.pl/articles/109840.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
magnetite
limonite
cement
radiation shielding
WinXCom
Opis:
In this study, gamma shielding properties of concretes containing magnetite and limonite ores at different ratios (5%, 10%, 15%, 20%, and 30%) were investigated by using a 60Co (1.25 MeV) radioactive source which was built in Thratron 1000E™ device used for radiotherapy purposes. Then, the photon transmission values (I/I0) were measured by 0.6 cm3, farmer type, PTW™ ion chamber. The dose readings (I0 and I), made by PTW™ Unidose Electrometer, were used to calculate the linear attenuation coefficient (, cm-1), the mean free path (, cm), and the mass attenuation coefficient (, cm2/g) by the Lambert equations, and the results were compared with the calculations obtained using the WinXCom computer program. The findings from this study revealed that the concretes containing magnetite and limonite ores were more effective than the ordinary concrete in the attenuation of gamma rays. It was determined that the values of the mean free path decreased with the increasing concentrations of magnetite and limonite ores while the linear attenuation coefficients for 10 concrete blocks increased with the increasing magnetite and limonite ore concentrations. A comparison of the theoretical values obtained from the WinXCom computer program and the experimental results revealed a good level of conformity.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 184-191
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synergistic effect of a mixture of dodecylamine and kerosene on separation of magnetite ore
Autorzy:
Liu, A.
Fan, M.-Q.
Li, Z.-H.
Powiązania:
https://bibliotekanauki.pl/articles/109849.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
DDA-kerosene
magnetite ore
quartz
flotation
Opis:
In this study, it was discovered that a mixture of dodecylamine (DDA)-kerosene demonstrated a stronger collecting ability for pure quartz and higher selectivity for magnetite ore. The relationship between the DDA-kerosene composition and mineral flotation performance on reverse flotation of magnetite ore was investigated. The results showed that floatability of the floating material increased when the DDA consumption increased. Specifically, during flotation, the fine particles (-0.074 mm fraction) selectively floated with DDA-kerosene. The difficult to float coarser particles (+0.074 mm fraction) with high content of quartz, required higher DDA dosage. However, higher DDA input during the flotation process did not necessarily yield better outcomes. The best results were obtained for 40/60 amine-to-oil ratio, as the quartz floated markedly with smaller magnetite loss and the flotation behavior was superior to pure DDA. Magnetite concentrates with 1.83% SiO2 and 71.04% Fe were produced using 120 g/Mg of DDA-kerosene (WDDA=40%).
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 647-661
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The mechanism study on aryl-substituted aromatic acid ionic liquid as the collector for quartz flotation
Autorzy:
Li, Haonan
Mei, Guangjun
Yu, Mingming
Cheng, Qian
Zhu, Guobin
Powiązania:
https://bibliotekanauki.pl/articles/109922.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ionic liquid
flotation collector
quartz
magnetite
Opis:
An aryl-substituted aromatic acid ionic liquid (M-X) was synthesized through hexadecyl trimethyl ammonium bromide and sodium salicylate, and it was employed as a flotation collector for the separation of quartz from magnetite. Laboratory flotation studies of magnetite and quartz were conducted using the M-X and dodecylamine (DDA) as collector. The results showed that the M-X has a stronger collecting ability and selectivity for quartz without starch. The adsorption mechanism of M-X on quartz and magnetite surfaces was studied by Fourier transform infrared spectroscopy (FTIR), zeta potential and X-ray photoelectron spectroscopy (XPS) analysis. Results indicated that the adsorption of M-X on the quartz surface was more efficient than that on the magnetite surface. And the salicylate anion in M-X was found to have depression effect to magnetite.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1239-1249
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of various surfactants on fatty acid for apatite flotation and their adsorption mechanizm
Autorzy:
Liu, Shuyong
Han, Baisui
Zhao, Tonglin
Powiązania:
https://bibliotekanauki.pl/articles/1447069.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
synergism effect
surfactant
flotation
apatite
magnetite
Opis:
The synergistic effect of surfactants, i.e., Tween-80 (polyethylene glycol sorbitan monooleate), Span-80 (sorbitanoleate), and MES (fatty acid methyl ester sulfonates), on fatty acid collectors were investigated using single mineral flotation experiments, surface tension measurement, Fourier transform infrared spectrum, and contact angle measurements. The single mineral flotation experiments showed that it was possible to efficiently separate apatite from magnetite, quartz, and biotite by mixing fatty acids with surfactants. The surface tension measurement showed that the surfactants could significantly reduce the surface tension and Critical Micelle Concentration (CMC) of fatty acids. Fourier transform infrared spectroscopy analysis indicated that all of the surfactants did not react with the fatty acids, but only physically adsorbed on the surface of apatite, thus promoting the chemical adsorption of fatty acids on apatite. However, the surfactant chemisorbed on magnetite and competing with a fatty acid, which led to a decrease in the flotation recovery. The results for contact angle measurement showed that the contact angle difference between apatite and magnetite increased with the addition of surfactant, and resulted in an efficient separation.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 5; 46-56
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Density functional simulation of metal oxides: $Al_2O_3$ and $Fe_3O_4$
Autorzy:
Łodziana, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2028983.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
density functional theory
metal oxides
alumina
magnetite
Opis:
The study of the metal oxides is a rapidly developing area of research. Below a theoretical method based on the density functional theory, common in studying ceramics, is briefly presented. Application of the theory to the surface and the bulk properties of alumina and magnetite are presented. Relaxation mechanism of two different surfaces of alumina and the (100) surface of Fe3O4 are shown. The mutual stability of the ? and ? phases of Al2O3 is calculated.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 4; 561-572
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase change of chlorite in reducing atmosphere
Autorzy:
Liu, X.
Yu, Y.
Chen, W.
Powiązania:
https://bibliotekanauki.pl/articles/110704.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chlorite
phase change
magnetizing
reducing roasting
magnetite
Opis:
Magnetizing roasting is an important pre-treatment technique for beneficiation of hematite and limonite ores. Reduction mechanisms of these iron minerals have been fully studied while the mechanism of reduction of chlorite is not well understood. In this study, a reduction roasting study examining the phase change of chlorite with roasting temperature was undertaken. The major finding from this study was that chlorite partially was reduced to magnetite by carbon at 750 ⁰C, and the newly formed magnetite was finely disseminated within quartz and olivine. It was demonstrated that these locked magnetite particles would be reported to iron concentrate by low intensity magnetic separation resulting in high impurity content, especially SiO2 and Al2O3 contents in the concentrate.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 607-614
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective agglomeration of magnetite in entlandite-serpentine system and implication for their separation
Autorzy:
Lu, J.
Yuan, Z.
Liu, J.
Li, L.
Wang, N.
Meng, Q.
Powiązania:
https://bibliotekanauki.pl/articles/110411.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
serpentine
pentlandite
magnetite
selective magnetic agglomeration
magnetic separation
Opis:
In nickel sulfide processing, magnesium silicates (serpentines) can easily form slime coatings or hetero-aggregation on pentlandite surfaces, and hence decrease the pentlandite flotation rate and recovery. In this work, magnetic separation of pentlandite from serpentine using selective magnetic coating through adding magnetite fines as magnetic seeds was investigated. Interactions of magnetite-pentlandite and magnetite-serpentine were calculated by the DLVO (Derjaguin-Landau-Verwey-Overbeek) theory. The results show that the interaction of magnetite-pentlandite was obviously stronger than that of magnetite-serpentine with an external weak magnetic field (4776 A/m-1). Therefore, fine magnetite fractions selectively adhered to the pentlandite surfaces and enhanced its magnetism, resulting in being separated from serpentine by magnetic separation, which was further verified by magnetic coating-magnetic separation and SEM observations.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 943-955
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reverse flotation of ultrafine magnetic concentrate by using mixed anionic/cationic collectors
Autorzy:
Lu, D.
Hu, Y.
Li, Y.
Jiang, T.
Sun, W.
Wang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/110550.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ultrafine magnetite
collector mixture
reverse flotation
closed flotation
Opis:
Compared to reverse cationic flotation, the advantages of reverse anionic flotation include relatively lower sensitivity to slimes and lower reagent cost. Besides, anionic collectors were found to have excellent capability of selectively separating an ultrafine magnetite ore. Addition of a small amount of cationic collector into the anionic collector as the collector mixture can improve the metallurgical results of removing silicates in reverse flotation. In this paper, NaOL and DDA were used for reverse flotation of the ultrafine magnetic concentrate. The separation performance of the collector mixture was investigated at different ratios of NaOL and DDA. The results showed that a better separation performance was obtained for the collector mixture than for NaOL alone. There was an optimal molar ratio between NaOL and DDA equal to 10:1. In the flotation system with the presence of the collector mixture, the good selectivity was found when starch was used as a depressor for magnetite and CaO was used as an activator for quartz. The influences of starch and CaO dosages on the separation performance of magnetite, quartz and chlorite had been investigated through micro-flotation tests. The infrared spectral analysis showed stretching vibration peaks of chemical adsorption of the collector mixture on the magnetite surface. The peaks were not present when starch was used as the depressor for magnetite. The closed flotation tests on the magnetic concentrate with the particle size of -25 μm were performed in the laboratory. The Fe concentrate assaying 64.52 % was obtained with Fe recovery of 80.66%, for the Fe content of feed equal to 52.98%.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 724-736
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecule dissociation at the Fe3O4 (001) surface
Autorzy:
Kim-Ngan, N.-T. H.
Jagło, D.
Sitko, D.
Soszka, W.
Powiązania:
https://bibliotekanauki.pl/articles/411955.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Magnetite surface
low energy ion scattering
molecule dissociation
Opis:
The molecular dissociation at the single-crystalline Fe3O4 (001) surface has been investigated using the diatomic H+2 , D+2 and N+2 molecules in the energy range of 3�{8 keV and in the temperature range of 90 K�{300 K. The single collision of ions released from dissociation with the surface atoms was observed only for the N2+ molecules. The detail analysis confirmed that for the light molecules such as H2+ and D2+ the charge-transfer process dominate the interaction of a molecule with the magnetite surface. A large change in the scattered ion yields around the Verwey phase transition temperature was observed indicating a strong correlation between the molecule dissociation and the electronic state of the magnetite surface.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 2; 1-10
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sorbent-Catalyst for Acceleration of The Iron Oxidation Process
Autorzy:
Gomelya, Mykola
Tverdokhlib, Mariia
Shabliy, Tetyana
Radovenchyk, Vyacheslav
Linyucheva, Olga
Powiązania:
https://bibliotekanauki.pl/articles/1839169.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
iron ions
magnetite
sorbent
catalyst
deironing
sorption capacity
Opis:
In this work, the process of water deironing by using magnetite as a catalyst to accelerate the oxidation of iron ions in an aqueous medium was investigated. It was shown that the efficiency of iron ion extraction depends on the solution concentration, sorbent dose and contact time. In all cases, the use of magnetite accelerated the process of extraction of iron by more than an order of magnitude in comparison with similar experiments on the oxidation of iron without the addition of a catalyst. At the pH values greater than 6, the use of magnetite as a catalyst contributes to the deep purification of water from iron ions.
Źródło:
Journal of Ecological Engineering; 2021, 22, 3; 221-230
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective extraction of vanadium from vanadium-titanium magnetite concentrates by non-salt roasting of pellets-H2SO4 leaching process
Autorzy:
Luo, Yi
Che, Xiaokui
Wang, Haixia
Zheng, Qi
Wang, Lei
Powiązania:
https://bibliotekanauki.pl/articles/1445902.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vanadium-titanium magnetite
pellets
selective extraction
sulfuric acid leaching
Opis:
In this work, a novel process of pellet non-salt roasting and H2SO4 leaching was proposed for the selective extraction of vanadium from vanadium–titanium magnetite concentrate. Vanadium can be leached but the iron impurity was maintained in the pellets. Moreover, the leached pellets can meet the quality requirements of the iron-making process after secondary roasting, realizing comprehensive utilization. The maximal vanadium leaching efficiency was up to 60.3%, whereas 0.17% of the iron impurity was leached. The optimum conditions of pellet roasting and leaching were obtained by single-factor experiments. The X-ray diffraction and scanning electron microscopy–energy disperse X-ray spectrometry analyses showed that the vanadium iron spinel can be oxidized and decomposed into Fe2O3 and vanadate during the roasting process. Given that dilute sulfuric acid can react with vanadate without reacting with Fe2O3 in the leaching process, selective vanadium extraction was realized. This work provides new insights into the industrial production of vanadium–titanium magnetite concentrate involving the direct extraction of vanadium.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 4; 36-47
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploration on flotation behavior of galena in seawater and related mechanism
Autorzy:
Song, Ningbo
Sun, Chuanyao
Yin, Wanzhong
Yao, Jin
Yang, Bin
Powiązania:
https://bibliotekanauki.pl/articles/2146915.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
high-sulfur magnetite
pyrrhotite flotation
magnetic separation
mixed collectors
Opis:
The utilization of seawater in mineral flotation is the future development trend because of the shortage of fresh water resources. However, at present, the flotation behavior and mechanism of galena in seawater are not clear. Therefore, this paper comprehensively carried out the effect mechanism of seawater on the flotation of galena. Micro-flotation results illustrated that the recovery of galena was higher in deionized water than that in 5×10-2 mol/L MgCl2 solution, 1×10-2 mol/L CaCl2 solution and seawater. Contact angle determination and Zeta potential distribution measurements showed that hydrophilic substances adsorbed on the surface of galena under alkaline conditions. X-ray photoelectron spectroscopy (XPS) analysis further indicated that these substances were hydroxides precipitates, carbonate precipitates and hydroxyl complexes formed by divalent magnesium and calcium ions, which prevented the adsorption of collector on mineral surface. As a result, the galena recovery declined in 5×10-2 mol/L MgCl2 solution, 1×10-2 mol/L CaCl2 solution and seawater.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 151524
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralogical characteristic and beneficiation evaluation of rare earth carbonate wall rock
Autorzy:
Gao, Chunqing
Yan, Guoying
Wang, Hailiang
Luo, Hongzhen
Zhang, Lin
Yang, Hanxu
Xu, Jian
Powiązania:
https://bibliotekanauki.pl/articles/2200340.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
rare earth
wall rock
magnetite
fluorite
process mineralogy
beneficiation
Opis:
In order to rationalize the development and utilization of the wall rock discarded during rare earth mining, chemical analysis, inductively coupled plasma-atomic emission spectroscopy, X-ray diffraction analysis, artificial panning, optical microscope analysis, mineral liberation analysis and energy-dispersive spectroscopy were used to study the process mineralogy of the wall rock. The results show that the main useful elements in the rare earth wall rock were iron, light rare earth elements, fluorine and niobium. Iron was mainly occurrence as magnetic iron in magnetite, rare earth elements in bastnaesite and monazite, fluorine as a independent mineral in fluorite and niobium in columbite. The main useful minerals were finely disseminated, with magnetite (48.16%), bastnaesite (49.04%), monazite (42.18%), fluorite (39.30%) and columbite (63.26%) distributed in -0.030 mm particle size. The useful minerals were evaluated separately for beneficiation based on the process mineralogical characteristics of the rare earth wall rock, and the results showed that magnetite, rare earth and fluorite resources could be effectively recovered using magnetic separation, flotation, gravity concentration and leaching enrichment methods. The sequential recovery of iron, rare earth, fluorine and niobium elements produces iron concentrate (65.40% TFe at recovery of 38.03%), rare earth concentrate (50.66% REE at recovery of 62.73%), fluorite concentrate (95.23% CaF2 at recovery of 40.34%) and niobium iron ore concentrate (1.63% Nb2O5 at recovery of 5.56%). This study provides recommendations for the rational development and utilization of rare earth wall rock and provides reasonable levels of recovery predictions.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 161300
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bakterie magnetotaktyczne i ich minerały
Magnetotactic bacteria and their minerals
Autorzy:
Sawłowicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2075488.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
bakteria
magnetotaksja
aerotaksja
magnetyt
greigite
bacteria
magnetotaxis
aerotaxis
magnetite
Opis:
Magnetotactic bacteria (MTB) produce magnetic minerals, magnetite (Fe3O4) and greigite (Fe3S4) in their cells. These magnetosome crystals form chains which allow bacterial cells to align with the Earth magnetic field. Magneto-aerotaxis allows bacteria to find optimal growth conditions in the water column. MTB species and their habitats are described, along with the description of minerals and the origin of magnetosomes. Fossil MTB are used to solve different geological problems they especially influence rock magnetism. Cultured magnetotactic bacteria and their nanominerals find more and more applications in many disciplines.
Źródło:
Przegląd Geologiczny; 2016, 64, 5; 328--337
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on recovery of iron and sulfur from high-sulfur magnetite ore
Autorzy:
Zhao, Yongqiang
Zhou, Wen-tao
Sun, Tichang
Ahmadzai, Asadullah
Powiązania:
https://bibliotekanauki.pl/articles/2146914.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
high-sulfur magnetite
pyrrhotite flotation
magnetic separation
mixed collectors
Opis:
In this paper, to produce a saleable magnetite concentrate with a sulfur level below 0.20% and recover sulfur concentrate, flotation and magnetic separation tests were undertaken. Results showed that the optimum conditions of flotation were established as follows: grinding fineness of 90% particles passing 0.074mm, pH 6, 400 g/t of CuSO4, and 400 g/t of combined collectors. Under these conditions and magnetic separation, S grade of the magnetite concentrate was reduced from 3.20% to 0.18%, and the Fe grade improved from 57.29% to 71.17%. At the same time a sulfur concentrate with S grade of 38.05% and recovery of 91.32% was also obtained. The XPS results showed that the addition of CuSO4 benefited the formation of hydrophobic Sn2-/S0 and Cu+-xanthate, enhancing pyrrhotite floatability. The flotation separation efficiency could be enhanced using a mixture of collectors, and collector mixture demonstrated three synergetic effects, namely enhanced S recovery, improved adsorption behavior of the collectors and enhanced hydrophobicity of pyrrhotite surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 150889
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concentration of chromite by means of magnetic carrier using sodium oleate and other reagents
Autorzy:
Ucbas, Y.
Bozkurt, V.
Bilir, K.
Ipek, H.
Powiązania:
https://bibliotekanauki.pl/articles/109814.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chromite
serpentine
magnetite
magnetic carrier
sodium oleate
zeta potential
FTIR
Opis:
Chromite recovery was studied using a magnetic carrier technology. Heavy media grade magnetite was used as the magnetic carrier. The effect of various reagents such as sodium oleate (NaOl) as a collector and carboxymethyl cellulose (CMC) as well as quebracho tannin as depressants on chromite removal was investigated. The effects of pH and reagent dosages were also determined. First, the zeta potential measurements were performed for different minerals in the absence and presence of NaOl, and then magnetic carrier tests were carried out under conditions based on zeta potential measurements. The magnetic carrier tests performed in the case of individual minerals (i.e. single minerals) showed that chromite (recovery of 95.1%) could be separated from serpentine (recovery of 3.2%) whereas it could not be separated from olivine. The best chromite concentrates containing 42.1% Cr2O3 were obtained with a 76% recovery from a synthetic mixtures of chromite and serpentine under optimum test conditions, that is at pH 10.5, 5.10–5 M NaOl, 20 g/Mg CMC, 0.5 g magnetite and 500 g/Mg kerosene (the feed contained 27% Cr2O3). Slime tailings of Turkish Maadin Company, Kavak Chrome Concentrating Plant in Eskisehir, which contain fine chromite, serpentine and olivine, were also investigated. It was found that chromite could not be satisfactorily recovered from the original slime sample in the presence and absence of NaOl by using the magnetic carrier technology. Additional FTIR studies performed with the investigated minerals showed that NaOl adsorption on chromite was greater than that on serpentine and magnetite minerals. It was also found that NaOl adsorption on serpentine is significantly reduced in the presence of magnetite while it increases only slightly on chromite.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 767-782
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro biocompatibility study of biodegradable hybrid composites based on polylactidenanofibres and calcium alginate nanocomposite fibres
Autorzy:
Menaszek, E.
Szparaga, G.
Król, P.
Stodolak-Zych, E.
Boguń, M.
Powiązania:
https://bibliotekanauki.pl/articles/285381.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
polylactide nanofibres
calcium alginate nanocomposite fibres
HAp
magnetite
spinning method
Źródło:
Engineering of Biomaterials; 2013, 16, no. 122-123 spec. iss.; 69-70
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controlled synthesis of iron oxide nanoparticles used as an efficient heavy metal ions adsorbent
Kontrolowana synteza nanocząstek tlenków żelaza stosowanych jako efektywny adsorbent jonów metali ciężkich
Autorzy:
Bobik, M.
Korus, I.
Brachmańska, M.
Powiązania:
https://bibliotekanauki.pl/articles/127234.pdf
Data publikacji:
2015
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
adsorption
heavy metals
magnetite
nanoparticles
adsorpcja
metale ciężkie
magnetyt
nanocząstki
Opis:
In this paper a few attempts of iron oxide nanoparticles synthesis via chemical co-precipitation are presented. Iron(II) and (III) salts were used as a precursors and aqueous ammonia as a precipitation medium. In the literature it was proved that there are some factors, like reaction temperature, base amount (pH of the reaction mixture) or the concentration of iron salts, which affects characteristics of formed nanoparticles such as their size distribution. The aim of presented research was to select such reaction parameters which would lead to the production of the most effective sorbent for few heavy metal ions, such as: Cr(VI), Pb(II), Cr(III), Cu(II), Zn(II), Ni(II) and Cd(II). The synthesis of nanoparticles were carried out for three temperatures (30, 60, 90ºC) and three ammonia volumes (8, 10, 15 cm3) for each temperature. Furthermore the influence of iron salts molar ratio Fe(II) : Fe(III) in the reaction mixture on resulting sorbent was examined. Because the syntheses were lead in the oxidizing environment, in order to compensate partial oxidation of Fe(II) to Fe(III), a few molar ratios Fe(II) : Fe(III) beyond the stoichiometric value (which is 1 : 2 for magnetite Fe3O4) were investigated. Additionally for the magnetite synthesized in the selected conditions the effect of pH on the sorption of heavy metal ions were examined. The pH conditions were estimated to not exceed 7 in order to avoid metal precipitation.
W pracy przedstawiono próby syntezy nanocząstek tlenków żelaza poprzez ich chemiczne współstrącanie. Jako medium strącające zastosowano wodę amoniakalną. W literaturze udowodniono wpływ takich czynników, jak temperatura reakcji, ilość zasady czy też stężenie soli żelaza Fe(II) i Fe(III) w mieszaninie reakcyjnej na charakterystykę, między innymi wielkość, powstających nanocząstek. Celem niniejszej pracy było dobranie takich parametrów reakcji, aby w efekcie uzyskać najbardziej efektywny sorbent względem jonów kilku metali ciężkich: Cr(VI), Pb(II), Cr(III), Cu(II), Zn(II), Ni(II) i Cd(II). Przeprowadzono syntezę nanocząstek w kombinacji trzech temperatur: (30, 60, 90ºC) oraz trzech objętości amoniaku: (8, 10, 15 cm3). Ponadto sprawdzono, jaki wpływ na powstający sorbent ma stosunek molowy jonów żelaza Fe(II) : Fe(III) w mieszaninie reakcyjnej. Biorąc pod uwagę fakt, iż synteza przeprowadzana była przy dostępie tlenu, w celu kompensacji częściowego utlenienia jonów żelaza Fe(II) do Fe(III), wyjściowy stechiometryczny stosunek tych jonów, który dla magnetytu (Fe3O4) wynosi 1:2, obniżono do kilku wartości poniżej 1 : 2. Dodatkowo dla magnetytu zsyntezowanego w wybranych, optymalnych, warunkach przeprowadzono próbę wpływu pH na sorpcję jonów metali. W celu uniknięcia możliwości wytrącania się osadów maksymalne pH ustalono na nieprzekraczające wartości 7.
Źródło:
Proceedings of ECOpole; 2015, 9, 2; 413-424
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie nanocząstek magnetytu w pełnej krwi ludzkiej za pomocą elektronowego rezonansu paramagnetycznego
A study of magnetite nanoparticles in whole human blood by means of electron paramagnetic resonance
Autorzy:
Kubiak, T.
Krzyminiewski, R.
Dobosz, B.
Schroeder, G.
Kurczewska, J.
Hałupka-Bryl, M.
Powiązania:
https://bibliotekanauki.pl/articles/262101.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
Tematy:
nanocząstka magnetytu
EPR
ludzka krew pełna
magnetite nanoparticles
whole human blood
Opis:
Pomiary pokrytych PEG (poli(glikol etylenowy) nanocząstek magnetytu o średnicy rdzenia 10 nm wykonano metodą spektroskopii elektronowego rezonansu paramagnetycznego w zakresie temperatur 135–235 K. Badano nanocząstki znajdujące się w roztworze wodnym oraz w pełnej krwi ludzkiej. Przed dodaniem nanocząstek do krwi, zidentyfikowano naturalnie występujące w niej centra paramagnetyczne. Widmo EPR nanocząstek magnetytu miało postać szerokiej linii, której parametry silnie zależały od temperatury. W przypadku obu ośrodków zaobserwowano wzrost wartości współczynnika g wraz z obniżaniem temperatury środowiska. W przypadku nanocząstek w wodzie, schładzanie próbki do coraz niższych temperatur powodowało poszerzenie linii EPR, natomiast dla nanocząstek we krwi efekt ten był obserwowalny jedynie w przedziale temperatur od 190 do 235 K. Wartości parametrów linii EPR różniły się dla nanocząstek znajdujących się w dwóch ośrodkach (krwi i wodzie), co może wskazywać na wpływ środowiska na wzajemne interakcje nanocząstek.
The measurements of PEG-coated magnetite nanoparticles (PEG – polyethyleneglicol) with a core diameter of 10 nm, were done by means of Electron Paramagnetic Resonance spectroscopy at the temperature range 135–235 K. Nanoparticles were examined in aqueous solution and in whole human blood. Paramagnetic centers naturally occurring in the blood were identified prior to the addition of nanoparticles. The EPR spectrum of magnetite nanoparticles has a form of a broad line, which parameters strongly depend on temperature. The increase in g-factor value was observed in case of both media, when the measurement temperature was being decreased. Gradual cooling of the sample of nanoparticles in water resulted in the broadening of the EPR line, whereas for nanoparticles in the blood this effect was only observed in the temperature range 190 to 235 K. The values of EPR line parameters were different for nanoparticles in two mentioned media (water and blood), which may indicate the influence of the environment on the interactions between nanoparticles.
Źródło:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2015, 21, 1; 9-15
1234-5563
Pojawia się w:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of fine beryl from quartz via magnetic carriers by the aiding of non-ionic surfactant
Autorzy:
Fawzy, Mona M.
Powiązania:
https://bibliotekanauki.pl/articles/1447589.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
beryl
magnetic carrier
sorbitan monooleate
oleate-coated magnetite
zeta potential
FTIR
Opis:
This study demonstrated the possibility of separating fine beryl from quartz by using magnetic carrier technology with the presence of non-ionic surfactant (Sorbitan monooleate). Oleatecoated magnetite was used as a magnetic carrier for enhancing the magnetic properties of fine beryl to be separated and get rid of the most common associated gangue mineral "quartz". This study proved that the most important factors affecting this separation process is the pH, as the study showed that the efficiency of the separation process is the maximum possible when pH at the isoelectric point (IEP) of beryl. Where at IEP, beryl is ready to adsorb oleate-coated maginetite onto its surface and the presence of sorbitan monooleate helps this adsorption and strengthens. To demonstrate the separation process, physico-chemical surface characterization for beryl, quartz, magnetite and oleate-coated magnetite was studied before and after treatment with sorbitan monooleate using zeta potential measurements and Fourier Transform Infrared (FTIR). Mineralogical characterization was take place for separated minerals of beryl, quartz and magnetite using x-ray diffraction (XRD) analyses and scanning electron microscope (SEM) with energy-dispersive spectrometer (EDS) unit. The magnetic carrier separation tests were performed in this study in the case of separate minerals investigated that fine beryl (94% recovery) could be recovered under optimum test conditions of 2.5 pH, 4.29 g/L sorbitan monooleate and 1:0.5 beryl to oleate-coated magnetite ratio, while quartz under the same conditions was recovered by 9.8%. FTIR measurements for the investigated minerals before and after treatment with sorbitan monooleate confirmed that the adsorption of sorbitan monooleate on the surface of beryl far exceeds that of the surface of quartz at beryl IEP.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 2; 14-23
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Separation of Magnetite Iron Novelties from Black Coal Fluid Bed-Ash
Separacja magnetyczna magnetytu z popiołów fluidalnych z węgla kamiennego
Autorzy:
Michalikova, F.
Brezani, I.
Dadova, J.
Stehlikova, B.
Sisol, M.
Frohlichova, M.
Powiązania:
https://bibliotekanauki.pl/articles/317985.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
separacja magnetyczna
popioły fluidalne
magnetyt
magnetic separation
fluid fly ash
magnetite
Opis:
This contribution presents possible separation method of valuable component – iron – from bed-ash resulting from combustion of black coal in fluid boilers of EVO Vojany thermal power plant. Valuable component is composed of particles of magnetite mineral novelties. All the particles act as mineral compounds paramagnetic up to ferromagnetic. Used mineral processing methods are based on knowledge of physical (influence of magnetic field), chemical and mineralogical (mineral novelties of Fe component) knowledge. Leachability of fluid ashes is high – pH 9 to 11. It is therefore necessary to use only dry preparation (classification) and mineral processing methods. Separation of Fe component from black coal fluid bed-ash is realized in process of dry low intensity magnetic separation, resulting in production of magnetite iron rich magnetic product – concentrate and non-magnetic product – tailings with low Fe content, containing mainly alum-silicate novelties of Fe, Ca, Al, Mg and other. Both products – concentrate and tailings – are further processed. Magnetic product is cleaned using dry low intensity magnetic separation and if further increase of Fe grade in final concentrate is needed, then also using second stage cleaning wet low intensity magnetic separation process. Non-magnetic product from roughing stage can be further processed by scavenging magnetic separation. Non-magnetic product from scavenging operation can be used as final product used in building industries. Magnetic product from cleaning operation is a final product with properties allowing its usage in industries, iron, or steel production. Morphology of produced Fe concentrates were studied using electron microscope and particles were analyzed using EDX analysis aimed on determination of highest Fe contents in individual products. Product of dry low intensity magnetic separation contained particles with 70 to 86% Fe. Product of wet low intensity magnetic separation the spectrum of EDX analyses ranges from 87 to 91% Fe. Electron microscope studies confirmed that in the process of wet low intensity magnetic separation, dust particles are washed away from surface of magnetic particles, resulting in higher Fe grades in final magnetic product after wet processing.
Praca przedstawia dostępne metody separacji cennego składnika – żelaza – z popiołu fluidalnego powstałego ze spalania węgla kamiennego w kotłach fluidalnych w elektrowni cieplnej EVO Vojany. Cenny związek powstaje z cząsteczek nowych form mineralnych magnetytu. Wszystkie cząsteczki mają właściwości paramagnetyczne aż do ferromagnetycznych. Wykorzystane metody przetwarzania oparte są na właściwościach fizycznych (wpływ pola magnetycznego), chemicznych i mineralogicznych (nowe formy mineralne związku żelaza). Odczyn popiołu jest wysoki – pH od 9 do 11. Istotne jest zatem, aby używać suchych metod przygotowania (klasyfikacja) oraz separacji. Oddzielanie związku żelaza od popiołu fluidalnego ze spalania węgla kamiennego zachodzi w procesie separacji magnetycznej na sucho., dzięki której powstaje produkt magnetyczny bogata w magnetyt – koncentrat i substancja niemagnetyczna – odpad z niską zawartością Fe, zawierający głównie nowe formy glinokrzemianów Fe, Ca, Al, Mg i innych. Oba produkty – koncentrat i odpady – podlegają dalszemu przetwarzaniu. Koncentrat magnetyczna jest oczyszczana przy użyciu separacji magnetycznej separacji na sucho, oraz, jeśli zajdzie potrzeba wyższej zawartości żelaza w końcowym produkcie, przechodzi przez drugą fazę oczyszczania przy użyciu separacji magnetycznej na mokro. Produkt niemagnetyczny z fazy obróbki wstępnej może zostać poddany dalszej obróbce opartej na czyszczącej separacji magnetycznej. Taki niemagnetyczny produkt jest gotowy do wykorzystania w przemyśle budowlanym. Produkt magnetyczny po procesie oczyszczania jest gotowym produktem z właściwościami pozwalającymi na wykorzystanie w przemyśle produkcji żelaza lub stali. Morfologia powstałych koncentratów żelaza została zbadana przy użyciu mikroskopu elektronowego, a cząsteczki zostały przeanalizowane przy użyciu analizy rentgenowskiej z dyspersją energii (ang. skrót EDX), w celu określenia najwyższych wartości Fe w poszczególnych produktach. Produkt powstały na skutek separacji magnetycznej zawierał cząsteczki z zawartością żelaza od 70 do 86%. Produkt powstały wskutek separacji magnetycznej na sucho zawierał cząsteczki mające od 70 do 86% Fe. Analiza spektralna EDX produktu przy magnetycznej separacji na mokro wykazała od 87 do 91% Fe. Badania mikroskopem elektronowym potwierdziły, że w procesie separacji magnetycznej na mokro cząsteczki pyłu są zmywane z powierzchni cząsteczek magnetycznych, co w rezultacie daje wyższą wartość Fe w końcowym produkcie magnetycznym na mokro.
Źródło:
Inżynieria Mineralna; 2015, R. 16, nr 2, 2; 111-116
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanokompozyt poly(ε-kaprolakton)/tlenki żelaza dla zastosowań medycznych
Poly(ε-caprolactone)/iron oxides nanocomposite for medical applications
Autorzy:
Świętek, M.
Gwizdała, J.
Tokarz, W.
Menaszek, E.
Błażewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/285834.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
magnetyczne nanokompozyty
polimery
magnetyt
cząstki magnetyczne
magnetic nanocomposites
polymer
magnetite
magnetic particles
Opis:
Nanokompozyty polimerowe stanowią szeroką grupę materiałów znajdujących zastosowanie zarówno w wielu gałęziach przemysłu, jak i w medycynie. Fenomen nanokompozytów związany jest z łatwością modyfikacji ich cech materiałowych będących pochodną właściwości zarówno samego polimeru, jak i zastosowanego nanododatku. Pozwala to na projektowanie oraz wytwarzanie materiałów o określonej charakterystyce, adresowanych do konkretnych potrzeb. Celem niniejszej pracy było otrzymanie oraz charakterystyka polimerowych nanokompozytów o właściwościach magnetycznych. Jako osnowę polimerową wykorzystano biozgodny i bioresorbowalny poli(ε-kaprolakton), do którego wprowadzono cząstki magnetytu znajdujące się w dyspersji nanometrycznej. Do przygotowania materiałów zastosowano prostą metodę odlewania filmu/odparowania rozpuszczalnika. W celu zbadania wpływu zawartości nanododatku na właściwości nanokompozytu przygotowano serię materiałów różniących się od siebie ilością wprowadzonych do matrycy polimerowej cząstek magnetycznych (0; 0,5; 1 oraz 2%). Charakterystyka nanokompozytów obejmowała badania własności magnetycznych i powierzchniowych materiałów oraz ocenę ich degradacji oraz biozgodności. Pętle histerezy wprowadzonego do matrycy polimerowej nanododatku oraz otrzymanych nanokompozytów wykazywały przebieg typowy dla multidomenowych materiałów ferrimagnetycznych. Zaobserwowano, że istnieje korelacja pomiędzy wartością namagnesowania nasycenia oraz remanencją, a zawartością cząstek magnetycznych w nanokompozycie. Na podstawie obserwacji mikroskopowych stwierdzono, że część wprowadzonych cząstek magnetycznych ulega aglomeracji, reszta zaś pozostaje w dyspersji nanometrycznej. Wytworzone materiały nie wykazały toksycznego wpływu na komórki (Normal Human Osteoblast), co pozwala sądzić, że otrzymane nanokompozyty mogłyby zostać wykorzystane w medycynie.
Polymer nanocomposites are a wide group of materials which have applications in many branches of industry as well as in medicine. The phenomenon of nanocomposites is associated with simplicity of modification of their features, which are derived from properties of both the polymer matrix and the nanoadditive. This property enables to design and fabricate materials with strictly defined characteristics, addressed to specific needs. The aim of the presented studies was fabrication and characterization of polymer nanocomposites with magnetic properties. As a polymer matrix, a biocompatible and bioresorbable poly(ε-caprolactone) was used. Magnetite powder with nanometer-sized grain fraction was introduced into the polymer matrix as a magnetic nanoadditive. As a fabrication method casting film/solvent evaporation was applied. In order to examine how amount of magnetic nanoadditive influences the properties of nanocomposites, the series of materials with various concentrations of magnetic particles was prepared (0, 0.5, 1 and 2%). Characterization of materials included magnetic and surface properties investigations as well as evaluation of degradability, and biocompatibility of the fabricated materials. Magnetic hysteresis loops of both the nanoadditive itself and the nanocomposite demonstrate curves typical for multi-domain ferromagnetic materials. Existence of the correlation between the values of magnetic saturation and remanence, and the content of magnetic particles has been observed. Microscopic evaluations have shown that small part of magnetic particles has tendency to agglomerate but the rest remains in nanometric dispersion. For the fabricated materials no cytotoxic influence on the cells was observed (Normal Human Osteoblast). This suggests that obtained nanocomposites could find application in medicine.
Źródło:
Engineering of Biomaterials; 2014, 17, 127; 22-32
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of crystallite size changes in a hematite and magnetite formed on steel used in the power idustry
Autorzy:
Gwoździk, M.
Powiązania:
https://bibliotekanauki.pl/articles/297993.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
10CrMo9-10 steel
hematite
magnetite
X-ray diffraction
crystallite sizes
Opis:
The paper presents results of studies on the crystallite sizes of oxide layer formed during a long-term operation on 10CrMo9-10 steel at an elevated temperature (T = 545° C, t = 200,000 h). This value was determined by a method based on analysis of the diffraction line profile, according to a Scherrer formula. The oxide layer was studied on a surface and a cross-section at the outer and inner site on the pipe outlet, at the fire and counter-fire wall of the tube. X-ray studies were carried out on the surface of a tube, then the layer’s surface was polished and the diffraction measurements repeated to reveal differences in the originated oxides layer.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(1); 65-73
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
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