Technical Faculty in Bor
Welcome to the digital repository of the University of Belgrade – Technical Faculty in Bor.
The software platform meets the current requirements that apply to the dissemination of scholarly publications and it is compatible with relevant international infrastructures.
Recent Submissions
Review of material and process parameters in the production of drawn SnPb wire
(Fakultet Tehničkih nauka, Kosovska Mitrovica, 2025) Kovačević, Avram; Stamenković, Uroš; Nedeljković, Milan
The aim of this study is to review pre-processing parameters prior to forming SnPb wire through the cold drawing process. The research focuses on different factors such as chemical composition and homogenity, oxide content, and the initial mechanical properties of starting materials prior to plastic deformation. Special attention is given to the selection of appropriate SnPb alloy ratios — primarily Sn60Pb40 and Sn63Pb37, due to their good mechanical, electrical and thermal properties. Further analysis of pre-processing steps such as surface cleaning, tool settings and mechanical processing regime is conducted to determine their effect on drawability, grain boundary behavior, and resistance to fracture during multi-pass drawing. All relevant parameters were analyzed in the context of minimizing processing defects such as wire breakage, ovality, and surface roughness. It is concluded that chemical homogenity and surface oxides play an important role in achieving a balance between ductility and strength during the processing. This is particularly important, given that the drawing process induces a significant amount of internal stresses. The chemical composition, especially the Sn-Pb ratio, has a major effect on the recrystallization temperature, which is a key factor defining the efficiency of the further plastic deformation. The applied thermomechanical treatment regime plays a crucial role in controlling microstructural evolution and stable drawing performance under industrial-scale production. This study contributes to improving production performance, ensuring high quality tolerances of the final products.
Influence of organic compound structure on brass corrosion inhibition efficiency
(University of Belgrade, Technical Faculty in Bor, 2025) Cvetković, Aleksandar; Petrović Mihajlović, Marija; Tasić, Zaklina; Radovanović, Milan B.; Simonović, Ana; Nedelkovski, Vladan
In this study the influence of organic compounds with different structures on the inhibition of brass corrosion in sodium chloride solutions of 0.9%, 2% and 3.5% is investigated. The experimental work includes the evaluation of the inhibition efficiency of 2-mercapto-1-methylimidazole (MMI), 2-amino-5-ethyl-1,3,4-thiadiazole (AETDA) and N-acetyl-L-leucine at various concentrations using electrochemical methods, including open circuit potential (OCP), cyclic voltammetry (CV), and potentiodynamic measurements (PD). The results show that all tested inhibitors reduce the corrosion currents and potentials, with the highest efficiency observed in solutions with the lowest sodium chloride concentration of 0.9%, where AETDA exhibited the highest inhibition efficiency of 92.93%, while MMI showed an efficiency of 88.78% at the same inhibitor concentration of 10-2 M. Compared to AETDA and MMI, N-acetyl-L-leucine at a concentration of 10-3 M showed
the lowest inhibition efficiency of 44.21%, while AETDA and MMI achieved inhibition efficiencies of 76.12% and 72.16%, respectively. Adsorption isotherms were used to evaluate the binding mechanisms of inhibitors on the brass surface, and physisorption was found to be the most likely mechanism for all tested compounds. These findings provide insight into the potential application of the investigated inhibitors to prevent brass corrosion under corrosive conditions.
Waste to resource transformation: innovative approaches to recycling cathode materials from lithium-ion batteries
(University of Belgrade, Technical Faculty in Bor, 2025) Cvetković, Aleksandar; Nedelkovski, Vladan; Medić, Dragana; Stanković, Sonja; Tasić, Zaklina; Radovanović, Milan B.; Milić, Snežana
The surging use of lithium-ion batteries (LIBs) has precipitated an imperative for sustainable recycling practices to recover valuable cathode materials, ensuring environmental stewardship and resource efficiency. This review delves into recent innovations in cathode material recycling from LIBs, focusing on methodologies that not only reclaim materials but also restore their functionality for reuse. Highlighted are cutting-edge techniques such as an electrochemical relithiation process, which rejuvenates spent cathode materials to equal the performance of new ones. At the forefront of these sustainable practices is the concept of direct regeneration via direct recycling, offering an economically viable and environmentally friendly approach to mend degraded cathodes. Such progress signals a shift away from conventional metallurgical methods toward intelligent regeneration, representing a significant step forward in the sustainable recycling
of LIBs. This review provides a brief analysis of these novel recycling processes, illustrating their ability to transform spent batteries into valuable resources, mitigate environmental harm, and foster a circular economy within the realm of energy storage.
Investigation of the copper and iron behavior during the leaching of flotation tailings in an ionic liquid solution [bmim][HSO4]
(Springer, 2025) Marilović, Dragana; Bogdanović, Grozdanka; Stevanović, Zoran; Petrović, Sanja J.; Sokić, Miroslav
A new sustainable leaching system with low reagents and energy consumption is a major step forward in the recovery of metals from secondary raw materials. Sulfuric acid is the most commonly used leaching agent for flotation tailings,
primarily due to its high efficiency, low cost, and availability. However, ionic liquids have recently attracted increasing attention as a more sustainable and selective alternative to conventional acids, due to their characteristics such as low volatility, chemical stability and possibility for regeneration. This study investigated the leaching behavior of Cu and Fe from flotation tailings with the ionic liquid solution [bmim][HSO4] and sulfuric acid solution (H2SO4) to compare the effect of these reagents on the extraction efficiency of Cu and Fe ions. The leaching parameters, such as ionic liquid concentration in the presence and absence of the oxidant, stirring speed, solid-liquid ratio, and oxidant concentration on the flotation tailings leaching, were investigated. The maximum copper extraction of 91.55% was achieved under the following conditions: solid/liquid ratio 1:20, 0.1 mol/dm3 concentration of ionic liquid, 1.5 mol/dm3 H2O2 concentration, stirring speed 400 rpm at ambient temperature within 120 min of leaching. Under the same conditions, the iron leaching degree was around 24%. Based on the copper leaching degree and content of copper oxide in the initial sample, it is assumed that Cu is also leached from sulfide minerals.
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.