TY  - CONF
AU  - Pantović Spajić, Katarina
AU  - Pantović Pavlović, Marijana
AU  - Božić, Katarina
AU  - Gjumišev, Đorđe
AU  - Panić, Vladimir
AU  - Pavlović, Miroslav
AU  - Stojanović, Ksenija
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/1119
AB  - The removal of organic and inorganic sulfur from the Bogovina Basin subbituminous coal by
electrochemical redox reactions was performed. The effect of presence of active bromine species
on the desulfurization process was monitored. The desulfurization was performed in inorganic
acidic solutions that contained different bromide concentrations and in pure acid solution. To
determine the optimal conditions for the desulfurization process, polarization curves were
recorded in three different electrolytes: 0.1 M H2SO4, 0.1 M H2SO4 + 0.01 M KBr, and 0.1 M
H2SO4 + 0.1 M KBr using graphite and dimensionally stable anode (DSA) electrodes as the
anode, while in all cases stainless steel S31603 electrode was used as cathode. By analyzing the
results obtained from the polarization curves, 0.1 M H2SO4 and 0.1 M H2SO4 + 0.1 M KBr were
chosen as the most suitable electrolytes. Also, it was found that the DSA anode showed better
results in terms of energy efficiency of the process compared to the graphite anode and therefore
it was selected for the coal desulfurization process. It is considered that finely suspended coal
particles in an electrolyte can behave according to bipolar electrochemistry. Coal was treated
for 4 hours in two selected electrolytes. The suspension was sampled at different times up to 240
min from the beginning of the process. Sulfur content in coal was determined by elemental
analysis. The results showed that the sulfur content decreases faster in the case of the electrolyte
containing KBr, i.e. that the desulfurization effect is significantly better than in the case of the
system containing only H2SO4. It can be concluded that active bromine species accelerate the
desulfurization process and thus improve energy efficiency.
PB  - Zvornik : University of East Sarajevo, Faculty of Technology
C3  - VIII International Congress “Engineering, Environment and Materials in Process Industry“
T1  - Study of the effects of active bromine species presence in electrolytic desulfurization of subbituminous coal
EP  - 64
SP  - 64
ER  - 

@conference{
author = "Pantović Spajić, Katarina and Pantović Pavlović, Marijana and Božić, Katarina and Gjumišev, Đorđe and Panić, Vladimir and Pavlović, Miroslav and Stojanović, Ksenija",
year = "2023",
abstract = "The removal of organic and inorganic sulfur from the Bogovina Basin subbituminous coal by
electrochemical redox reactions was performed. The effect of presence of active bromine species
on the desulfurization process was monitored. The desulfurization was performed in inorganic
acidic solutions that contained different bromide concentrations and in pure acid solution. To
determine the optimal conditions for the desulfurization process, polarization curves were
recorded in three different electrolytes: 0.1 M H2SO4, 0.1 M H2SO4 + 0.01 M KBr, and 0.1 M
H2SO4 + 0.1 M KBr using graphite and dimensionally stable anode (DSA) electrodes as the
anode, while in all cases stainless steel S31603 electrode was used as cathode. By analyzing the
results obtained from the polarization curves, 0.1 M H2SO4 and 0.1 M H2SO4 + 0.1 M KBr were
chosen as the most suitable electrolytes. Also, it was found that the DSA anode showed better
results in terms of energy efficiency of the process compared to the graphite anode and therefore
it was selected for the coal desulfurization process. It is considered that finely suspended coal
particles in an electrolyte can behave according to bipolar electrochemistry. Coal was treated
for 4 hours in two selected electrolytes. The suspension was sampled at different times up to 240
min from the beginning of the process. Sulfur content in coal was determined by elemental
analysis. The results showed that the sulfur content decreases faster in the case of the electrolyte
containing KBr, i.e. that the desulfurization effect is significantly better than in the case of the
system containing only H2SO4. It can be concluded that active bromine species accelerate the
desulfurization process and thus improve energy efficiency.",
publisher = "Zvornik : University of East Sarajevo, Faculty of Technology",
journal = "VIII International Congress “Engineering, Environment and Materials in Process Industry“",
title = "Study of the effects of active bromine species presence in electrolytic desulfurization of subbituminous coal",
pages = "64-64"
}

Pantović Spajić, K., Pantović Pavlović, M., Božić, K., Gjumišev, Đ., Panić, V., Pavlović, M.,& Stojanović, K.. (2023). Study of the effects of active bromine species presence in electrolytic desulfurization of subbituminous coal. in VIII International Congress “Engineering, Environment and Materials in Process Industry“
Zvornik : University of East Sarajevo, Faculty of Technology., 64-64.

Pantović Spajić K, Pantović Pavlović M, Božić K, Gjumišev Đ, Panić V, Pavlović M, Stojanović K. Study of the effects of active bromine species presence in electrolytic desulfurization of subbituminous coal. in VIII International Congress “Engineering, Environment and Materials in Process Industry“. 2023;:64-64..

Pantović Spajić, Katarina, Pantović Pavlović, Marijana, Božić, Katarina, Gjumišev, Đorđe, Panić, Vladimir, Pavlović, Miroslav, Stojanović, Ksenija, "Study of the effects of active bromine species presence in electrolytic desulfurization of subbituminous coal" in VIII International Congress “Engineering, Environment and Materials in Process Industry“ (2023):64-64.

TY  - JOUR
AU  - Pantović-Spajić, Katarina
AU  - Marković, Branislav
AU  - Pavlović, Miroslav M.
AU  - Sokić, Miroslav
AU  - Zildžović, Snežana
AU  - Đorđević, Nataša
AU  - Stojanović, Ksenija
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/575
AB  - The study is focused on the determination of the most effective chemical leaching process for the simultaneous demineralization/deashing and desulfurization of subbituminous coal from the Bogovina Basin. Coal was treated for 30 min, at different temperatures, using variable concentrations of hydrochloric, nitric, acetic and citric acids; hydrogen peroxide, mixture of hydrogen peroxide and nitric acid (pH 2), as well as by the stepwise leaching process (nitric acid + mixture of hydrogen peroxide and nitric acid, pH 2). The changes in mineral composition, caused by the chemical leaching, are followed using X-ray diffraction, whereas alterations of coal organic matter are tracked by Fourier-transform infrared spectroscopy and the content of fixed carbon. Inorganic acid leaching, regardless of the temperature and acid concentration, enabled the successful deashing of coal, whereas the percent of desulfurization was insufficient. The organic acid leaching was not satisfactory for both, deashing and desulfurization. Leaching by H2O2 and H2O2/HNO3 mixture (pH 2) resulted in moderate desulfurization, but the ash reduction was low. The most suitable method for the simultaneous effective ash (78 wt.%) and the sulfur (66 wt. %) removal from Bogovina coal is the two-step leaching, combining 10 vol. % HNO3 and mixture of 35 vol. % H2O2/10 vol. % HNO3 of pH 2 at 60 degrees C.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Deashing and desulfurization of subbituminous coal from the East field (Bogovina Basin, Serbia) - Insights from chemical leaching
EP  - 1126
IS  - 11
SP  - 1113
VL  - 86
DO  - 10.2298/JSC210719061P
UR  - conv_924
ER  - 

@article{
author = "Pantović-Spajić, Katarina and Marković, Branislav and Pavlović, Miroslav M. and Sokić, Miroslav and Zildžović, Snežana and Đorđević, Nataša and Stojanović, Ksenija",
year = "2021",
abstract = "The study is focused on the determination of the most effective chemical leaching process for the simultaneous demineralization/deashing and desulfurization of subbituminous coal from the Bogovina Basin. Coal was treated for 30 min, at different temperatures, using variable concentrations of hydrochloric, nitric, acetic and citric acids; hydrogen peroxide, mixture of hydrogen peroxide and nitric acid (pH 2), as well as by the stepwise leaching process (nitric acid + mixture of hydrogen peroxide and nitric acid, pH 2). The changes in mineral composition, caused by the chemical leaching, are followed using X-ray diffraction, whereas alterations of coal organic matter are tracked by Fourier-transform infrared spectroscopy and the content of fixed carbon. Inorganic acid leaching, regardless of the temperature and acid concentration, enabled the successful deashing of coal, whereas the percent of desulfurization was insufficient. The organic acid leaching was not satisfactory for both, deashing and desulfurization. Leaching by H2O2 and H2O2/HNO3 mixture (pH 2) resulted in moderate desulfurization, but the ash reduction was low. The most suitable method for the simultaneous effective ash (78 wt.%) and the sulfur (66 wt. %) removal from Bogovina coal is the two-step leaching, combining 10 vol. % HNO3 and mixture of 35 vol. % H2O2/10 vol. % HNO3 of pH 2 at 60 degrees C.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Deashing and desulfurization of subbituminous coal from the East field (Bogovina Basin, Serbia) - Insights from chemical leaching",
pages = "1126-1113",
number = "11",
volume = "86",
doi = "10.2298/JSC210719061P",
url = "conv_924"
}

Pantović-Spajić, K., Marković, B., Pavlović, M. M., Sokić, M., Zildžović, S., Đorđević, N.,& Stojanović, K.. (2021). Deashing and desulfurization of subbituminous coal from the East field (Bogovina Basin, Serbia) - Insights from chemical leaching. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 86(11), 1113-1126.
https://doi.org/10.2298/JSC210719061P
conv_924

Pantović-Spajić K, Marković B, Pavlović MM, Sokić M, Zildžović S, Đorđević N, Stojanović K. Deashing and desulfurization of subbituminous coal from the East field (Bogovina Basin, Serbia) - Insights from chemical leaching. in Journal of the Serbian Chemical Society. 2021;86(11):1113-1126.
doi:10.2298/JSC210719061P
conv_924 .

Pantović-Spajić, Katarina, Marković, Branislav, Pavlović, Miroslav M., Sokić, Miroslav, Zildžović, Snežana, Đorđević, Nataša, Stojanović, Ksenija, "Deashing and desulfurization of subbituminous coal from the East field (Bogovina Basin, Serbia) - Insights from chemical leaching" in Journal of the Serbian Chemical Society, 86, no. 11 (2021):1113-1126,
https://doi.org/10.2298/JSC210719061P .,
conv_924 .

TY  - CONF
AU  - Pavlović, Miroslav
AU  - Pantović Spajić, Marijana
AU  - Bartl, Pavel
AU  - Stevanović, Jasmina
AU  - Pantović, Radoje
AU  - Pantović Spajić, Katarina
AU  - Radak, Bojan
PY  - 2019
UR  - https://ritnms.itnms.ac.rs/handle/123456789/1139
AB  - Flow meters are essential part of equipment in almost all chemical and process industries. Knowledge of
the flow dynamics and flow of material through the reactor system is required to evaluate the performance of the
reactors, processes, operation and design. Traditionally this evaluation can be performed using chemical tracers.
Chemical tracer results are not always precise and they could not allow an online diagnosis. The samples
containing chemical tracer have to go to a lab for analysis and chemical tracers are less sensitive than radioactive
ones. Radioactive tracers are the only tracers capable of measuring the active residence time distribution (RTD)
with high degree of precision and give information on-line without stopping the process. In this work the application
of radiotracer method for RTD measurement in flow meter calibration is described. The RTD measurements of the
system were performed in pilot-scale perfect mixer in series reactor for flow meter calibration with Technetium-
99 m (99mTc) as a radiotracer in the form of pertechnetate ion (99mTcO4
-). The optimization of the parameters
included input signal of radiotracer, concentration of radiotracer and position of detectors. The measured data
were analyzed, and standard and relative deviations were quantified under different operating conditions. A plug
flow model was used to simulate the measured RTD curves and investigate the flow dynamics of the flowing water.
The results of the study showed that the optimum concentration of 99mTc for flow meter calibration was 0.3 ml
having activity 0.68 mCi. The standard deviation was σ=0.10 l min-1 and the relative deviation was 0.94%. The
results of the study can help in the operation and design of the existing systems and design of new ones.
PB  - Belgrade : University of Belgrade, Faculty of Mining and Geology
C3  - 7th International Symposium Mining and Environmental Protection, International Conference, Proceedings
T1  - Technetium-99m as a Tracer for the Liquid Residence Time Distribution Measurement: Optimization of Different Radiotracer Parameters for Flow Meter Calibration
EP  - 173
SP  - 166
ER  - 

@conference{
author = "Pavlović, Miroslav and Pantović Spajić, Marijana and Bartl, Pavel and Stevanović, Jasmina and Pantović, Radoje and Pantović Spajić, Katarina and Radak, Bojan",
year = "2019",
abstract = "Flow meters are essential part of equipment in almost all chemical and process industries. Knowledge of
the flow dynamics and flow of material through the reactor system is required to evaluate the performance of the
reactors, processes, operation and design. Traditionally this evaluation can be performed using chemical tracers.
Chemical tracer results are not always precise and they could not allow an online diagnosis. The samples
containing chemical tracer have to go to a lab for analysis and chemical tracers are less sensitive than radioactive
ones. Radioactive tracers are the only tracers capable of measuring the active residence time distribution (RTD)
with high degree of precision and give information on-line without stopping the process. In this work the application
of radiotracer method for RTD measurement in flow meter calibration is described. The RTD measurements of the
system were performed in pilot-scale perfect mixer in series reactor for flow meter calibration with Technetium-
99 m (99mTc) as a radiotracer in the form of pertechnetate ion (99mTcO4
-). The optimization of the parameters
included input signal of radiotracer, concentration of radiotracer and position of detectors. The measured data
were analyzed, and standard and relative deviations were quantified under different operating conditions. A plug
flow model was used to simulate the measured RTD curves and investigate the flow dynamics of the flowing water.
The results of the study showed that the optimum concentration of 99mTc for flow meter calibration was 0.3 ml
having activity 0.68 mCi. The standard deviation was σ=0.10 l min-1 and the relative deviation was 0.94%. The
results of the study can help in the operation and design of the existing systems and design of new ones.",
publisher = "Belgrade : University of Belgrade, Faculty of Mining and Geology",
journal = "7th International Symposium Mining and Environmental Protection, International Conference, Proceedings",
title = "Technetium-99m as a Tracer for the Liquid Residence Time Distribution Measurement: Optimization of Different Radiotracer Parameters for Flow Meter Calibration",
pages = "173-166"
}

Pavlović, M., Pantović Spajić, M., Bartl, P., Stevanović, J., Pantović, R., Pantović Spajić, K.,& Radak, B.. (2019). Technetium-99m as a Tracer for the Liquid Residence Time Distribution Measurement: Optimization of Different Radiotracer Parameters for Flow Meter Calibration. in 7th International Symposium Mining and Environmental Protection, International Conference, Proceedings
Belgrade : University of Belgrade, Faculty of Mining and Geology., 166-173.

Pavlović M, Pantović Spajić M, Bartl P, Stevanović J, Pantović R, Pantović Spajić K, Radak B. Technetium-99m as a Tracer for the Liquid Residence Time Distribution Measurement: Optimization of Different Radiotracer Parameters for Flow Meter Calibration. in 7th International Symposium Mining and Environmental Protection, International Conference, Proceedings. 2019;:166-173..

Pavlović, Miroslav, Pantović Spajić, Marijana, Bartl, Pavel, Stevanović, Jasmina, Pantović, Radoje, Pantović Spajić, Katarina, Radak, Bojan, "Technetium-99m as a Tracer for the Liquid Residence Time Distribution Measurement: Optimization of Different Radiotracer Parameters for Flow Meter Calibration" in 7th International Symposium Mining and Environmental Protection, International Conference, Proceedings (2019):166-173.

TY  - CONF
AU  - Pantović Pavlović, Marijana
AU  - Eraković, Sanja
AU  - Pavlović, Miroslav
AU  - Pantović Spajić, Katarina
AU  - Panić, Vladimir
AU  - Pavlović, Miomir
PY  - 2017
UR  - https://ritnms.itnms.ac.rs/handle/123456789/1140
AB  - Hydroxyapatite (HAp) is the most suitable biocompatible material for bone implant coatings.
However, its brittleness is a major obstacle, and that is why, recently, research focused on creating composites.
In this study, a novel in situ synthesis of HAp coating on titanium was presented. HAp was anaphoretically
deposited from alkaline-ethanol suspension in one step process. Morphology of the coating was investigated by
optical microscopy, while deposited HAp was characterized using ATR-FTIR. It was concluded that HAp has
excellent coverage of the surface without delamination. The obtained coating can be good material for bone
implants due to solving HAp brittleness.
PB  - Bor : University of Belgrade, Technical Faculty in Bor
C3  - "ECOLOGICAL TRUTH" ECO-IST'17
T1  - In Situ Synthesis of Biocompatible Composite Layer of Hydroxyapatite/Passive Oxide Surfaces on the Modified Titanium
EP  - 306
SP  - 301
ER  - 

@conference{
author = "Pantović Pavlović, Marijana and Eraković, Sanja and Pavlović, Miroslav and Pantović Spajić, Katarina and Panić, Vladimir and Pavlović, Miomir",
year = "2017",
abstract = "Hydroxyapatite (HAp) is the most suitable biocompatible material for bone implant coatings.
However, its brittleness is a major obstacle, and that is why, recently, research focused on creating composites.
In this study, a novel in situ synthesis of HAp coating on titanium was presented. HAp was anaphoretically
deposited from alkaline-ethanol suspension in one step process. Morphology of the coating was investigated by
optical microscopy, while deposited HAp was characterized using ATR-FTIR. It was concluded that HAp has
excellent coverage of the surface without delamination. The obtained coating can be good material for bone
implants due to solving HAp brittleness.",
publisher = "Bor : University of Belgrade, Technical Faculty in Bor",
journal = ""ECOLOGICAL TRUTH" ECO-IST'17",
title = "In Situ Synthesis of Biocompatible Composite Layer of Hydroxyapatite/Passive Oxide Surfaces on the Modified Titanium",
pages = "306-301"
}

Pantović Pavlović, M., Eraković, S., Pavlović, M., Pantović Spajić, K., Panić, V.,& Pavlović, M.. (2017). In Situ Synthesis of Biocompatible Composite Layer of Hydroxyapatite/Passive Oxide Surfaces on the Modified Titanium. in "ECOLOGICAL TRUTH" ECO-IST'17
Bor : University of Belgrade, Technical Faculty in Bor., 301-306.

Pantović Pavlović M, Eraković S, Pavlović M, Pantović Spajić K, Panić V, Pavlović M. In Situ Synthesis of Biocompatible Composite Layer of Hydroxyapatite/Passive Oxide Surfaces on the Modified Titanium. in "ECOLOGICAL TRUTH" ECO-IST'17. 2017;:301-306..

Pantović Pavlović, Marijana, Eraković, Sanja, Pavlović, Miroslav, Pantović Spajić, Katarina, Panić, Vladimir, Pavlović, Miomir, "In Situ Synthesis of Biocompatible Composite Layer of Hydroxyapatite/Passive Oxide Surfaces on the Modified Titanium" in "ECOLOGICAL TRUTH" ECO-IST'17 (2017):301-306.

TY  - CONF
AU  - Pantović, Radoje
AU  - Pantović, Marijana
AU  - Pantović, Katarina
AU  - Pavlović, Miroslav
PY  - 2016
UR  - https://ritnms.itnms.ac.rs/handle/123456789/1118
AB  - Study of monitoring and analyzing the deformation of the collector Krivelj River. has been developed. In the period May - July 2009, the recording of the measurements and the state of the crack deformation in reinforced concrete collectors lining was performed. 
Based on analysis of the recording, four characteristic lining deformation of the shape in vulnerable parts of the collector were identified: in calotte, on the sides of calotte, sides themselves, and sides of ducts. 
Deformations in calotte zone were in form of tension cracks, reinforcement tears and separation of concrete from the reinforcement created due to high tensile stresses in the inner part of the reinforced concrete lining. The worst damage was observed due to shear stresses in the lateral parts of the calotte, while the cracks in some parts exceeded 10 cm. These are very large and dangerous damages to the collector. Given that there was a fracture of concrete, loads in those areas was taken over by the armature, which was affected by severe corrosion. Due to the large vertical pressures and the tendency for flattening of the collector in internal lateral parts of support, there was erosion of concrete in the form of plates. Small cracks appeared in the side parts of the collector ducts, too. 
For collector cross sections recording, in addition to the geodetic procedure, rotating laser beam procedure was applied. Based on these recordings it can be concluded that the profile of the collector, on his damaged sections, is ""flattened"". The laser process enables easier, faster and more credible measurements of the size and shape of the profile, which may be of particular importance when installing frameworks for future temporary and permanent rehabilitation of vulnerable sections of the collector. 
Changes in the deformation of the ten selected places in collectors were observed using embedded devices for measuring deformation cracks in collector reinforced concrete support. Final results of monitoring changes in absolute and relative deformation of reinforced concrete collector of over time show that established shifts arc part of the process of reinforced concrete roof supports deformation, which is directed towards the fracture and support breaking.
PB  - Society of Chemists and Technologists of Macedonia
C3  - 24th Congress of Chemists and Technologists of Macedonia, International Conference
T1  - Monitoring of Krivelj river collector deformation
EP  - 161
SP  - 161
ER  - 

@conference{
author = "Pantović, Radoje and Pantović, Marijana and Pantović, Katarina and Pavlović, Miroslav",
year = "2016",
abstract = "Study of monitoring and analyzing the deformation of the collector Krivelj River. has been developed. In the period May - July 2009, the recording of the measurements and the state of the crack deformation in reinforced concrete collectors lining was performed. 
Based on analysis of the recording, four characteristic lining deformation of the shape in vulnerable parts of the collector were identified: in calotte, on the sides of calotte, sides themselves, and sides of ducts. 
Deformations in calotte zone were in form of tension cracks, reinforcement tears and separation of concrete from the reinforcement created due to high tensile stresses in the inner part of the reinforced concrete lining. The worst damage was observed due to shear stresses in the lateral parts of the calotte, while the cracks in some parts exceeded 10 cm. These are very large and dangerous damages to the collector. Given that there was a fracture of concrete, loads in those areas was taken over by the armature, which was affected by severe corrosion. Due to the large vertical pressures and the tendency for flattening of the collector in internal lateral parts of support, there was erosion of concrete in the form of plates. Small cracks appeared in the side parts of the collector ducts, too. 
For collector cross sections recording, in addition to the geodetic procedure, rotating laser beam procedure was applied. Based on these recordings it can be concluded that the profile of the collector, on his damaged sections, is ""flattened"". The laser process enables easier, faster and more credible measurements of the size and shape of the profile, which may be of particular importance when installing frameworks for future temporary and permanent rehabilitation of vulnerable sections of the collector. 
Changes in the deformation of the ten selected places in collectors were observed using embedded devices for measuring deformation cracks in collector reinforced concrete support. Final results of monitoring changes in absolute and relative deformation of reinforced concrete collector of over time show that established shifts arc part of the process of reinforced concrete roof supports deformation, which is directed towards the fracture and support breaking.",
publisher = "Society of Chemists and Technologists of Macedonia",
journal = "24th Congress of Chemists and Technologists of Macedonia, International Conference",
title = "Monitoring of Krivelj river collector deformation",
pages = "161-161"
}

Pantović, R., Pantović, M., Pantović, K.,& Pavlović, M.. (2016). Monitoring of Krivelj river collector deformation. in 24th Congress of Chemists and Technologists of Macedonia, International Conference
Society of Chemists and Technologists of Macedonia., 161-161.

Pantović R, Pantović M, Pantović K, Pavlović M. Monitoring of Krivelj river collector deformation. in 24th Congress of Chemists and Technologists of Macedonia, International Conference. 2016;:161-161..

Pantović, Radoje, Pantović, Marijana, Pantović, Katarina, Pavlović, Miroslav, "Monitoring of Krivelj river collector deformation" in 24th Congress of Chemists and Technologists of Macedonia, International Conference (2016):161-161.