Technical Faculty in Bor
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Recent Submissions
The determinants of electric and hybrid vehicle adoption - a perspective from Serbia
(University of Belgrade, Technical faculty in Bor, 2025) Mitić, Petar; Kojić, Milena ; Hanić, Aida; Fedajev, Aleksandra; Radulescu, Magdalena; Dembińska, Izabela
This study investigates the factors influencing the intention to purchase electric and hybrid vehicles in Serbia. It draws upon socio-demographic characteristics, social influence, environmental concerns, and policy measures to gain a nuanced understanding of the complexities of adopting sustainable transportation alternatives in Serbia. Using descriptive and inferential statistics, decision tree analysis, and logistic regression enabled a rigorous examination of the determinants influencing attitudes and intentions toward electric and hybrid vehicles (EHVs). The findings emphasized the importance of positive evaluation from influential individuals and the introduction of higher taxes on more polluting vehicles as important factors that impact electric and hybrid vehicle adoption according to all three applied methods. In addition to these factors, the results from the two applied methods further highlight the significance of household income, the positive societal perception of EHVs, and the belief that EHVs contribute to reduced pollution. Since age, residence, education level, and household size do not emerge as significant factors influencing respondents' intention to purchase EHVs and all remaining factors appear to be relevant according to only one of the applied methods, the focus should be placed on the factors identified as significant by either two or all three methods. Such results provide a solid basis for policy recommendations in Serbia to promote electric and hybrid vehicles adoption.
Comparative study of the effect of particle size on flotation kinetics of raw and waste coal
(MDPI, 2025) Sokolović, Jovica; Djolović, Ivana; Tanikić, Dejan; Štirbanović, Zoran; Ilic, Ivana
This study examines the influence of particle size on the flotation kinetics parameters of both raw and waste fine coal originating from the anthracite mine “Vrška Čuka”, Serbia. Flotation kinetics modeling was performed using MATLAB for nonlinear regression analysis, based on coal flotation test data. The correlation between total combustible recovery and flotation time was determined using the following models: Classical, Klimpel, Kelsall, Modified Kelsall, and Fully Mixed. The coefficients of determination range from 0.9724 (the Klimpel model) to 1 (the modified Kelsall model) for raw coal and from 0.8609 (the Klimpel model) to 0.9981 (the modified Kelsall model) for waste coal. Although both the Classical and Modified Kelsall models demonstrated a good correlation with the experimental data, the Modified Kelsall model provided a slightly better fit. The maximum values of the flotation rate constant (k) for both coals were obtained for the particle size-class (−0.1 + 0.053) mm for the Classical model and (−0.2 + 0.1) mm for the modified Kelsall model. The relation between flotation kinetics constant (k) and average particle size value (dsr) was estimated for the Classical model and the modified Kelsall model. It was observed that the flotation kinetics constant (k) for coal particle size could be predicted satisfactorily.
Comparative analysis on washability indices of anthracite coal by using MCDM methods
(Wroclaw University of Science and Technology, Poland, 2025) Sokolović, Jovica; Stanujkić, Dragisa; Štirbanović, Zoran; Ilić, Ivana
This paper presents the results of the Multi-Criteria Decision Making (MCDM) methods for determining the optimal separation density in the gravity separation of anthracite coal, and also suggests an appropriate MCDM model for this purpose. Five separation densities were selected as the output and seven coal washability indices were used as the input based on the washability results of coal. The SAW, TOPSIS, WASPAS, WISP, and CoCoSo methods were used in this study. The evaluation indices of the five methods were averaged as a new index. Finally, alternative A4 (i.e., the optimal separation density is 1650 kg/m3) was selected as the final separation density.
Behavior of zinc, calcium and iron in the two-stage leaching process of the EAF dust
(University of Belgrade - Technical Faculty in Bor, 2025) Trifunović, Vanja; Milić, Snežana; Avramović, Ljiljana; Božić, Dragana; Avramović, Zoran
The treatment of the EAF dust was carried out by applying the leaching process in two technological stages in order to selectively separate certain components from the EAF dust. In the first stage, a pre-treatment was performed to selectively remove water-soluble components from the original EAF dust sample, while in the second stage, zinc was selectively separated from the resulting solid residue by acid leaching. In the second stage of the leaching process, the influence of the acid leaching process time on the zinc, calcium and iron leaching rates were investigated. Selective zinc recovery from the EAF dust was achieved with the following optimal parameters of the acid leaching process: leaching reagent 1.0 M solution of H2SO4, ambient temperature, S:L ratio =1:4, time 10 min and stirring speed 500 rpm. The zinc leaching rate in the second leaching stage was 60.74%, while the Ca and Fe leaching rates were significantly lower and
amounted to 12.18% and <0.01%, respectively.
The effect of particle size on the flotation kinetics of raw and waste coal
(University of Belgrade, Technical Faculty in Bor, 2025) Sokolović, Jovica; Djolović, Ivana; Tanikić, Dejan; Štirbanović, Zoran; Ilić, Ivana
This paper investigates the effect of particle size on the flotation kinetics parameters of raw and waste fine coal from anthracite mine "Vrška Čuka, Serbia. Based on batch flotation test data of coal, non-linear fitting was conducted by using MatLab for modeling first order flotation kinetics. The cumulative combustible recovery against flotation time were correlated using the Classical model. The coefficient of determination (r2) values of the proposed model were from 0.9904 to 0.9998 for raw coal and from 0.9555 to 0.9980 for waste coal. The maximum values of the flotation rate constant (k) for both coals were obtained for the particle size fractions (-0.1+0.053) mm. The relation between flotation kinetics constant (k) with particle size (dsr) was estimated through equations presented in the paper (Eq. 3 and 4).