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Tytuł:
The influence of the degree of iron-ore enrichment on it’s metallization parameters
Autorzy:
Amdur, A. M.
Pelevin, A. E.
Purevsuren, B.
Munkhtuul, L.
Raznitsina, A. L.
Powiązania:
https://bibliotekanauki.pl/articles/411734.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Fe
iron ore
coal
magnetite ore
production of superconcentrate
enrichment of ore
Opis:
Have been developed a scheme of enrichment (benification) of magnetite iron-ore concentrates with total content of Fet = 31 % in ore at magnetic separator and obtained a superconcentrate with Fet = 69,50 %. Experimentally determined that the reduction reaction degree of Fe by coal increases linearly with increasing of the content of Fe in concentrate. Certainly it has positive influence of decreasing the content of more difficult for reduction and poor magnetic iron containing components in the processing of wet magnetic separation (WMS). Almost all iron are in the form of good to reduce magnetite in the superconcentrates and enrichment of concentrate accompanying with growth of specific surface.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 14; 89-95
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the effectiveness of organic binders as an alternative to bentonite in the pelletization of low grade iron ore
Autorzy:
Tafadzwa, Ngara
Mavengere, Shielah
Bright, Sharrydon
Mapamba, Liberty
Powiązania:
https://bibliotekanauki.pl/articles/27323655.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bentonite
iron ore
low grade ore
organic binder
pelletization
pellet evaluation
refractory ore
Opis:
Bentonite is the traditionally used binder in iron ore pelletization. However, it consists of up to 85% silica and alumina which are undesired acidic gangue in iron-making. In this study, carboxymethyl cellulose, sodium lignosulfonate and cornstarch were used as acidic gangue-free organic alternatives to bentonite in synthesizing iron pellets. Iron ore, water and the corresponding binder were mixed and rolled in a pelletizing disk to form green pellets. The green pellets were dried and subsequently indurated in a furnace at 1200 ℃ to form indurated pellets. To evaluate the effectiveness of the organic binders, the pellets produced were tested on various pellet properties. Known industrial pellet property standards and the bentonite binder were used as references. Carboxymethyl cellulose, sodium lignosulfonate and corn starch produced green pellets with average drop numbers of 7.20 ± 0.84, 5.60 ± 0.89 and 6.00 ± 1.00 respectively, compared to bentonite’s 5.00 ± 0.71. Dry pellets of average compressive strength 5.93 ± 0.09, 5.86 ± 0.03 and 11.52 ± 0.18 kg/pellet were produced by carboxymethyl cellulose, sodium lignosulfonate and corn starch respectively while bentonite’s averaged 5.60 ± 0.08 kg/pellet. For indurated pellets, carboxymethyl cellulose (210.2 ± 1.88 kg/pellet) and sodium lignosulfonate (198.1 ± 2.49 kg/pellet) pellets were weaker than those of bentonite (250.4 ± 2.06 kg/pellet) but satisfied the industrial requirement of 181.4 kg/pellet. A boron oxide additive (0.1 wt. %) was used to boost the strength of carboxymethyl cellulose indurated pellets to 252.6 ± 1.32 kg/pellet, rendering them superior to those of bentonite.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 176094
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Department of Geophysics
Autorzy:
Jarzyna, J.
Dec, J.
Wawrzyniak-Guz, K.
Powiązania:
https://bibliotekanauki.pl/articles/184176.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
black coal
copper
iron ore
Źródło:
Geology, Geophysics and Environment; 2016, 42, 2; 236-240
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A preliminary study on enrichment of Anini iron ore for use by Algerian metallurgical industry
Autorzy:
Chaabia, R.
Bounouala, M.
Boukelloul, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/88999.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
enrichment
iron ore
desliming
basicity index
metallurgy
Opis:
The Anini iron ore contains mainly ferriferous hematite rocks with inclusions of quartz and clay. The chemical analysis showed that the average content of iron is 55% while SiO2 and Al2O3 is 26.20% and 12%, respectively. The XRD mineralogical analysis confirmed that the prevailing mineral phase are hematite, quartz, clay and some inclusions of calcite in this matrix. According to the tests, preliminary desliming by washing provides iron 62% is the concentrate while SiO2 decreases from 26.20% to 2.30% and Al2O3from 12% to 3%. The calculated partial basicity index Ip= (CaO/SiO2) was 1.07, meaning that the washed-out ore achieves standards to be used in metallurgy. The by-products remaining after washing (quartz, clay and a small content of iron) can be used in cement production.
Źródło:
Mining Science; 2015, 22; 201-213
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physicochemical study and application for pyrolusite separation from high manganese-iron ore in the presence of microorganisms
Autorzy:
Farghaly, Mohamed Galal
Abdel-Khalek, Nagui Aly
Abdel-Khalek, Mohamed Abdel-Dayem
Selim, Khaled Abdelaal
Abdullah, Samah Saleh
Powiązania:
https://bibliotekanauki.pl/articles/1448933.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
iron ore
bioflotation
pyrolusite
hematite
Paenibacillus polymyxa
Opis:
Paenibacillus polymyxa bacteria strain as a surface modifier in a flotation process could remove 64.89% of $MnO_2$ from high manganese iron ore. A concentrate containing 3.7% $MnO_2$, 0.5% $SiO_2$ and 71.30% $Fe_2O_3$, with a hematite recovery of 72.46% is produced from a feed containing 8.79% $MnO_2$, 0.49% $SiO_2$ and 67.90% $Fe_2O_3$. The bio-flotation results indicated that such type of bacteria is selective for upgrading El-Gedida iron ore from the Western Desert of Egypt. The role of Paenibacillus polymyxa on the surface properties of pyrolusite and hematite single minerals was investigated through zeta potential, FTIR and adsorption measurements.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 1; 273-283
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of new commercial collectors for the recovery of coarse quartz particles in iron ore flotation
Autorzy:
de Oliveira, Geraldo Lisboa
da Silva, Gilberto Rodrigues
Powiązania:
https://bibliotekanauki.pl/articles/24202892.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
new collector
amine
iron ore
coarse quartz
Opis:
Currently, a small range of commercial collectors is available for the use in reverse iron ore flotation at Vale. This input represents a considerable unit cost, being essential for the concentration of low content itabiritic iron ores. The present work evaluated the reverse cationic flotation of an itabiritic ore with low iron content (39.6 % Fe) from the Iron Quadrangle (BR) in bench scale tests, focusing on the use of new collectors to remove coarse quartz. The sample presents 19% of its particles as oversize in the 0.150 mm sieve. The poor flotation of coarse quartz particles (>0.150 mm) causes significant problems in various iron ore flotation circuits by contaminating the concentrate. The study evaluated the performance of 10 new collectors from the etheramine family with different degrees of neutralization and at different collector dosages. The flotation process variables were set as industrially practiced at the Cauê iron ore plant (BR). In tests varying the specific collector dosage, the nonneutralized etheramines showed improved performance compared to the current 50% neutralized etheramine used in the plant, achieving industrial targets: concentrate SiO2 content rate lower than 4.5% (1.4%), tailings iron content lower than 23% (18.94%), metallurgical recovery greater than 66% (74,8%), and Gaudin Selectivity Index greater than 6.6 (10.5). The 0.150 mm oversize in the concentrate, mostly coarse quartz particles, was reduced from 5.7% down to 1.2%, indicating the potential for the industrial application of non-neutralized etheramines in the recovery of coarse quartz.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 174292
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study on the effect of using conventional and high pressure grinding rolls crushing on the ball mill grinding kinetics of an iron ore
Autorzy:
Barani, K.
Balochi, H.
Powiązania:
https://bibliotekanauki.pl/articles/109893.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
high pressure grinding rolls
HPGR
grinding
iron ore
Opis:
The effect of using conventional and high pressure grinding rolls (HPGR) crushing on the ball mill grinding of an iron ore was assessed to determine how these different comminution processes affect the ball mill grinding kinetic. For this purpose, the sample was obtained from the Jalalabad Iron Ore Mine and crushed by conventional crusher and HPGR. Then, the crushing products were ground in a laboratory ball mill. Five single-sized fractions of (–4+3.15 mm), (–2+1.7 mm), (–1+0.850 mm), (–0.500+0.420 mm), and (–0.212+0.180 mm) were selected as the ball mill feed. The specific rates of breakage (Si) and cumulative breakage distribution function (Bi,j) values were determined for those size fractions. It was found that for all fraction the Bi,1 values of the HPGR product were higher than those for the crusher product. It means that the particles produced by the dry ball milling of the HPGR product were finer than by the crusher. Also, the results showed that the specific breakage rate of the material crushed by HPGR at coarse fractions (–4+3.15 mm, -2+1.7 mm, and -1+0.850 mm) was higher than the material crushed by conventional crushers. However, at fine fractions (–0.500+0.420 mm and -0.212+0.180 mm), there was a small difference and the specific breakage rates were the same. This issue can be explained by the fact, that for coarse fractions the particles had longer side surfaces and thus were more affected by the lateral pressure. The results of verification test showed that after 60 seconds of grinding the 80% passing size of the HPGR and crusher products (D80) were reduced from 3311 μm to 760 μm and 1267 μm, respectively.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 920-931
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations on a novel collector for anionic reverse flotation separation of quartz from iron ores
Autorzy:
Fang, Ji
Ge, Yingyong
Liu, Shunbing
Yu, Jun
Liu, Cheng
Powiązania:
https://bibliotekanauki.pl/articles/1448585.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
reverse flotation
iron ore
quartz
collector
fatty acid
Opis:
It is necessary to exploit an easy and effective way to obtain flotation collector. In this paper, oleic acid was modified by oxidation reaction to obtain an excellent collector. The flotation performances of oleic acid and its oxidation products were systematically investigated and a novel collector ((E)-8,11-dihydroperoxyoctadec-9-enoic acid, EDEA) was obtained. Single mineral flotation tests results showed that EDEA had strong flotation power towards quartz at pH＞11 and hardly floated hematite and magnetite at pH=8~13. The recovery of quartz could achieve 92.35% with 120 mg/L EDEA under the condition of pH=12 and dosage of $CaCl_2$ 60mg/L while the recovery was 62.44% with 120 mg/L oleic acid. Bench scale flotation tests results showed that EDEA had a preferable effect on separating quartz from iron ore especially at low flotation temperature (288K). The mechanism research revealed that EDEA attracted on quartz surface through electrostatic attraction and the neighboring EDEA molecules could form intermolecular hydrogen bonds which resulted in a closer alignment of EDEA on quartz surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 1; 136-155
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of iron ore processing in technological units based on the hybrid approach
Autorzy:
Morkun, Vladimir
Tron, Vitaliy
Zymohliad, Vadym
Powiązania:
https://bibliotekanauki.pl/articles/2106233.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
iron ore
Rosin–Rammler
fuzzy model
separation characteristics
Opis:
The process line of concentrating iron ore materials is considered as a sequence of connected concentration units, some of which partially return ore materials to the previous unit. The output product of the final concentration unit in the process line is the end product of the whole line. Characteristics of ore, such as distribution of ore particles by size and distribution of iron content by size classes, are considered. Processing of iron ore materials by process units (a cycle, a scheme) is characterised by a separation characteristic – namely the function of extracting elementary fractions depending on physical properties of ore particles. The results of fraction analysis of ore samples in different points of the process line provide an experimental definition of separation characteristics and numerical values of the Rosin–Rammler equation factors. To identify dependencies that cannot be analytically described, the hybrid approach accompanied by the Takagi–Sugeno fuzzy models, in accompaniment with triangular membership functions determining fuzzy sets in preconditions, are used. To identify fuzzy sets in rule preconditions, triangular membership functions are used. Introduction of a-priori data on iron ore concentration as constraints for model parameters is a promising trend of further research, since it enables increased accuracy of identification despite limited availability of experimental data.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 1; 82--90
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New method of electrostatic separation of the oxidized iron ore
Autorzy:
Idres, A.
Bouhedja, A.
Bounouala, M.
Benselhoub, A.
Powiązania:
https://bibliotekanauki.pl/articles/89112.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
iron ore
electrostatic separation
reagent-collector
reagent–depressant
efficiency
Opis:
The complexity of the mineralogical, chemical and exogenous parameters generates a low efficiency of electrical separation of oxidized iron ore. For this purpose, a study was conducted to provide a method for electrostatic separation and to select the chemical reagents. And this, for increasing the contrast of the dielectric separating minerals in the corona discharge field. The reagent-collector used is the auramine with a specific consumption of 0.3 kg/t. Whereas, the reagent depressants is carboxymethyl cellulose mixture with a specific consumption of 0.25 kg/t. From the obtained test results electrical treatment of oxidized iron ore are satisfied for proposed process.
Źródło:
Mining Science; 2016, 23; 33-41
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of reduction of magnetite based carbon composite pellets under semi-fusion conditions
Autorzy:
Benkli, Y. E.
Boyrazli, M.
Senoz, G. M. L.
Cizmecioglu, Z.
Powiązania:
https://bibliotekanauki.pl/articles/110725.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
iron ore
pelletizing
cold bonded composite pellet
iron nugget
Opis:
In this study, carbon composite pellets were exposed to a reduction test under low temperature and semi-fusion conditions in which iron was melted without a solid form of slag deteriorated. The purpose of the reduction experiments under the semi-fusion condition was to produce an iron nugget which had physical and chemical properties similar to blast furnace pig iron at lower temperatures. These nuggets were produced from pellets that were made from a mixture of iron oxide, coke, flux, and a binder. These nuggets heated in a furnace with a chamber temperature of 1330 °C. The produced dried carbon composite pellets were melted and carbureted in a single-stage process. In this study, three distinct products were produced as a function of furnace residence time at fixed furnace temperature (1330 °C). These products were direct reduced iron (DRI), transition direct reduced iron (TDRI), and iron nuggets produced at residence times 8-24, 32-40 min, and 48 min, respectively. The iron nugget produced had a high apparent density (6.903 g/cm3), high micro hardness values (328 HV), high iron content (92.7% Fe), and was similar to blast furnace pig iron.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 621-628
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of high voltage electrical pulses on iron ore comminution to improve desulfurization flotation recovery
Autorzy:
Soltanmohammadi, Vahid
Noaparast, Mohammad
Aslani, Soheila
Powiązania:
https://bibliotekanauki.pl/articles/2146929.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
high voltage electrical pulses
crushing
flotation
desulfurization
iron ore
Opis:
In this research, the effect of employing high voltage electrical pulse (HVEP) on crushing to improve the recovery of iron ore desulfurization was investigated compared to mechanical crushing. To determine the effect of mechanical and electrical crushing, jaw crusher, cone crusher, and high voltage electrical pulse crusher (50Kv) were applied. The results indicated that coarser particles with fewer slimes are produced in the initial crushing stage using electric pulses. Selective separation mechanism from the boundary of the particles based on different dielectric constants, was the main difference between the HVEP method and mechanical crushing. In the flotation process of sulfide minerals crushed by an electric pulse crusher, recovery of the sample was 10.6% higher, and the grade of sulfur in flotation residue of iron ore concentrate was approximately 58% lower than the sample which was undergone through the initial mechanical crushing stage. The obtained results evidenced 37.5% increase in flotation kinetics constant while electric pulse crushing is preferred to mechanical crushing. For mineralogical studies, microparticles (-38 microns) were studied in the pulp phase of the sample, and the results proved that in the electric pulse crushing of the microparticles, they are dispersed, and there is a distance between them, while in the mechanical approach they are formed in the shape of agglomerated particles. This phenomenon leads to better preparation and further possible contact of pyrite particles with air bubbles, which increases flotation kinetics and the recovery of sulfur merely when electric pulse crushing was employed.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 150264
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predictive control of the iron ore beneficiation process based on the hammerstein hybrid model
Autorzy:
Porkuian, Olga
Morkun, Vladimir
Morkun, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/970606.pdf
Data publikacji:
2019
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
predictive control
iron ore
beneficiation
Hammerstein model
recursive-parallel model
Opis:
Non-linear, dynamic, non-stationary properties characterize objects of the iron ore beneficiation line. Therefore, for their approximation, it is advisable to use models of the Hammerstein class. As a result of comparing the three models of Hammerstein: simple, parallel and recursive-parallel, it was shown that the best result for identifying the considered processes of magnetic beneficiation of iron ore by the minimum error criterion was obtained using the Hammerstein recursive-parallel model. Hence, it is recommended for the identification of beneficiation production objects.
Źródło:
Acta Mechanica et Automatica; 2019, 13, 4; 262-270
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of magnetic separation and reverse anionic flotation to concentrate fine particles of iron ore with high sulfur content
Autorzy:
Dehghani, Fahimeh
Khosravi, Rasoul
Pazoki, Amir
Kebe, Moustapha
Jahanian, Reza
Siavoshi, Hossein
Ghosh, Tathagata
Powiązania:
https://bibliotekanauki.pl/articles/2146898.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
iron ore
fine particles
magnetic separation
reverse anionic flotation
sulfur
Opis:
The sulfur content in iron ore causes technical problems in the process of sintering iron ore in steel and alloys, and environmental problems in discharging the tailing. The major challenge in the iron ore processing plant is handling the finer particles. The key objectives of this research included the concentration of Band Narges Mine iron ore (< 150 μm) as well as the reduction of the sulfur content to achieve a marketable product. First, the mineralogical characterization of iron ore was established, which showed that Fe3O4, SiO2, and CaO were the predominant minerals in the ore body. Moreover, magnetite particles with a size of < 150 μm were mainly locked into the associated gangue mineral. Second, metallurgical experiments were conducted, including magnetic separation and froth flotation. To increase the iron grade and recovery and decrease the sulfur content, two separate process flowsheets were tested, three steps of magnetic separation with a magnetic field strength of 2000 G were used in the first process flowsheets, followed by regrinding to < 74 μm and application of a three-stage reverse flotation. The overall iron grade and recovery were 76.38% and 67.9%, respectively, from this flowsheet. A five-stage successive reverse flotation followed by three stages of magnetic separation at 1000 G was carried out in the second flowsheet. The final recovery and grade of iron for this flowsheet were 77.15% and 64.3%, respectively. The ultimate content of sulfur was estimated at 0.74%.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 3; art. no. 145420
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of Shipment Size in Seaborne Iron Ore Trade
Autorzy:
Zhou, X.
Hu, Q.
Powiązania:
https://bibliotekanauki.pl/articles/117393.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
cargo handling
shipment size
estimation of shipment size
seaborne iron ore trade
AIS Data
Maritime Mobile Service Identify (MMSI)
BP Neural Network
iron ore
Opis:
Shipment size is unavailable and important in AIS-based trade volume estimates. A method of shipment size estimates based on AIS (Automatic Identification System) data and BP neural network is proposed. The ship's length, width, designed draught, current draught and deadweight ton are input parameters, the actual shipment size of the ship is output value, and the BP neural network is trained to estimate the actual shipment size of the iron ore carriers. Then, the AIS data is used to calculate the iron ore trade volume in 2018. Compared with customs data, the annual error of import volume of China is less than 0.5%. The result shows that the proposed method is accurate and practical.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 4; 791-796
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
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