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 A.
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4845
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°C.
PB  - Belgrade : Serbian Chemical Society
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
VL  - 86
IS  - 11
SP  - 1113
EP  - 1126
DO  - 10.2298/JSC210719061P
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 A.",
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°C.",
publisher = "Belgrade : Serbian Chemical Society",
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",
volume = "86",
number = "11",
pages = "1113-1126",
doi = "10.2298/JSC210719061P"
}

Pantović-Spajić, K., Marković, B., Pavlović, M. M., Sokić, M., Zildžović, S., Đorđević, N.,& Stojanović, K. A.. (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
Belgrade : Serbian Chemical Society., 86(11), 1113-1126.
https://doi.org/10.2298/JSC210719061P

Pantović-Spajić K, Marković B, Pavlović MM, Sokić M, Zildžović S, Đorđević N, Stojanović KA. 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 .

Pantović-Spajić, Katarina, Marković, Branislav, Pavlović, Miroslav M., Sokić, Miroslav, Zildžović, Snežana, Đorđević, Nataša, Stojanović, Ksenija A., "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 . .

TY  - JOUR
AU  - Radovanović, Dragana
AU  - Kamberović, Željko
AU  - Anđić, Zoran
AU  - Ranitović, Milisav
AU  - Marković, Branislav
PY  - 2018
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2185
AB  - Jarosite and neutral leaching residue (NLR) are the greatest environmental problems of hydrometallurgical zinc production due to their high quantity and hazardous content. Pyrometallurgical processes, such as the Waelz process, could be applied to recover valuable metals present in this waste. The paper investigates the possibility of forming environmentally stable Waelz slag after the Waelz process of jarosite and NLR. Waelz slag, obtained using CaO as a conventional alkaline additive in the Waelz process, showed high As and Sb release after the EN 12457-4 standard leaching test. Multiphase equilibrium composition calculations indicated that As and Sb were present as volatile and migratory species in the slag. In order to obtain Waelz slag with more stable matrices that would encapsulate and immobilize pollutants, MgO additions to CaO and different cooling conditions of the slag were further investigated. The efficiency of modification in additives composition and cooling conditions was assessed by EN 12457-4 leaching test and chemical and microstructural characterization (XRF and SEM-EDS analyses) of the Waelz slags. The results show that addition of MgO does not reduce the efficiency of the process, even more it increases leaching resistance of the slags. Concentrations of all investigated metals (As, Ba, Cu, Mo, Pb, Sb, Zn) after the leaching test were below defined limits for non-hazardous waste. Microstructural analyses revealed that MgO remained inert during Waelz process, and thus favoring the formation of amorphous stable structure, which was enhanced by increased cooling rate. All investigated Waelz slags with MgO additions are suitable for further use or safe disposal.
PB  - Oficyna Wydawnicza Politechniki Wroclawskiej, Wroclaw
T2  - Physicochemical Problems of Mineral Processing
T1  - The effect of CaO and MgO addition and cooling rate on stability of slag obtained after jarosite and neutral leaching residue treatment in the Waelz process
VL  - 54
IS  - 2
SP  - 484
EP  - 495
DO  - 10.5277/ppmp1842
ER  - 

@article{
author = "Radovanović, Dragana and Kamberović, Željko and Anđić, Zoran and Ranitović, Milisav and Marković, Branislav",
year = "2018",
abstract = "Jarosite and neutral leaching residue (NLR) are the greatest environmental problems of hydrometallurgical zinc production due to their high quantity and hazardous content. Pyrometallurgical processes, such as the Waelz process, could be applied to recover valuable metals present in this waste. The paper investigates the possibility of forming environmentally stable Waelz slag after the Waelz process of jarosite and NLR. Waelz slag, obtained using CaO as a conventional alkaline additive in the Waelz process, showed high As and Sb release after the EN 12457-4 standard leaching test. Multiphase equilibrium composition calculations indicated that As and Sb were present as volatile and migratory species in the slag. In order to obtain Waelz slag with more stable matrices that would encapsulate and immobilize pollutants, MgO additions to CaO and different cooling conditions of the slag were further investigated. The efficiency of modification in additives composition and cooling conditions was assessed by EN 12457-4 leaching test and chemical and microstructural characterization (XRF and SEM-EDS analyses) of the Waelz slags. The results show that addition of MgO does not reduce the efficiency of the process, even more it increases leaching resistance of the slags. Concentrations of all investigated metals (As, Ba, Cu, Mo, Pb, Sb, Zn) after the leaching test were below defined limits for non-hazardous waste. Microstructural analyses revealed that MgO remained inert during Waelz process, and thus favoring the formation of amorphous stable structure, which was enhanced by increased cooling rate. All investigated Waelz slags with MgO additions are suitable for further use or safe disposal.",
publisher = "Oficyna Wydawnicza Politechniki Wroclawskiej, Wroclaw",
journal = "Physicochemical Problems of Mineral Processing",
title = "The effect of CaO and MgO addition and cooling rate on stability of slag obtained after jarosite and neutral leaching residue treatment in the Waelz process",
volume = "54",
number = "2",
pages = "484-495",
doi = "10.5277/ppmp1842"
}

Radovanović, D., Kamberović, Ž., Anđić, Z., Ranitović, M.,& Marković, B.. (2018). The effect of CaO and MgO addition and cooling rate on stability of slag obtained after jarosite and neutral leaching residue treatment in the Waelz process. in Physicochemical Problems of Mineral Processing
Oficyna Wydawnicza Politechniki Wroclawskiej, Wroclaw., 54(2), 484-495.
https://doi.org/10.5277/ppmp1842

Radovanović D, Kamberović Ž, Anđić Z, Ranitović M, Marković B. The effect of CaO and MgO addition and cooling rate on stability of slag obtained after jarosite and neutral leaching residue treatment in the Waelz process. in Physicochemical Problems of Mineral Processing. 2018;54(2):484-495.
doi:10.5277/ppmp1842 .

Radovanović, Dragana, Kamberović, Željko, Anđić, Zoran, Ranitović, Milisav, Marković, Branislav, "The effect of CaO and MgO addition and cooling rate on stability of slag obtained after jarosite and neutral leaching residue treatment in the Waelz process" in Physicochemical Problems of Mineral Processing, 54, no. 2 (2018):484-495,
https://doi.org/10.5277/ppmp1842 . .

TY  - JOUR
AU  - Sokić, Miroslav
AU  - Kamberović, Željko
AU  - Nikolić, Vesna
AU  - Marković, Branislav
AU  - Korać, Marija
AU  - Anđić, Zoran
AU  - Gavrilovski, Milorad
PY  - 2015
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5056
AB  - The objects of this investigation were the comparative kinetic analysis of the NiO and NiCl2 reduction by hydrogen during an induction period and elimination of the calcination during the synthesis of Ni/Al2O3 catalysts.The effect of temperature and time on NiO and NiCl2 reduction degrees was studied. Avrami I equation was selected as the most favorable kinetic model and
used to determine activation energy of the NiO and NiCl2 reduction for the investigated temperature range (623–923 K) and time intervals (1–5 minutes).Theinvestigation enabled reaching conclusions about the reaction ability and rate of the reduction processes.
Afterward,Ni/Al2O3 catalystswere obtained by using oxide and chloride precursor forNi.The catalystswere supported on aluminabased foamand prepared via aerosol route. Properties of the samples before and after low-temperature hydrogen reduction (633K) were compared.Obtained results indicated that the synthesis ofNi/Al2O3 catalysts can be more efficient if chloride precursor for Ni is directly reduced by hydrogen during the synthesis process, without the calcination step. In addition, Ni-Pd/Al2O3 catalysts with different metal content were prepared by using chloride precursors. Lower reduction temperature was utilized and the chlorides were almost completely reduced at 533 K.
T2  - The Scientific World Journal
T1  - Kinetics of NiO and NiCl2 Hydrogen Reduction as Precursors and Properties of Produced Ni/Al2O3 and Ni-Pd/Al2O3 Catalysts
VL  - 2015
SP  - 1
EP  - 9
DO  - 10.1155/2015/601970
ER  - 

@article{
author = "Sokić, Miroslav and Kamberović, Željko and Nikolić, Vesna and Marković, Branislav and Korać, Marija and Anđić, Zoran and Gavrilovski, Milorad",
year = "2015",
abstract = "The objects of this investigation were the comparative kinetic analysis of the NiO and NiCl2 reduction by hydrogen during an induction period and elimination of the calcination during the synthesis of Ni/Al2O3 catalysts.The effect of temperature and time on NiO and NiCl2 reduction degrees was studied. Avrami I equation was selected as the most favorable kinetic model and
used to determine activation energy of the NiO and NiCl2 reduction for the investigated temperature range (623–923 K) and time intervals (1–5 minutes).Theinvestigation enabled reaching conclusions about the reaction ability and rate of the reduction processes.
Afterward,Ni/Al2O3 catalystswere obtained by using oxide and chloride precursor forNi.The catalystswere supported on aluminabased foamand prepared via aerosol route. Properties of the samples before and after low-temperature hydrogen reduction (633K) were compared.Obtained results indicated that the synthesis ofNi/Al2O3 catalysts can be more efficient if chloride precursor for Ni is directly reduced by hydrogen during the synthesis process, without the calcination step. In addition, Ni-Pd/Al2O3 catalysts with different metal content were prepared by using chloride precursors. Lower reduction temperature was utilized and the chlorides were almost completely reduced at 533 K.",
journal = "The Scientific World Journal",
title = "Kinetics of NiO and NiCl2 Hydrogen Reduction as Precursors and Properties of Produced Ni/Al2O3 and Ni-Pd/Al2O3 Catalysts",
volume = "2015",
pages = "1-9",
doi = "10.1155/2015/601970"
}

Sokić, M., Kamberović, Ž., Nikolić, V., Marković, B., Korać, M., Anđić, Z.,& Gavrilovski, M.. (2015). Kinetics of NiO and NiCl2 Hydrogen Reduction as Precursors and Properties of Produced Ni/Al2O3 and Ni-Pd/Al2O3 Catalysts. in The Scientific World Journal, 2015, 1-9.
https://doi.org/10.1155/2015/601970

Sokić M, Kamberović Ž, Nikolić V, Marković B, Korać M, Anđić Z, Gavrilovski M. Kinetics of NiO and NiCl2 Hydrogen Reduction as Precursors and Properties of Produced Ni/Al2O3 and Ni-Pd/Al2O3 Catalysts. in The Scientific World Journal. 2015;2015:1-9.
doi:10.1155/2015/601970 .

Sokić, Miroslav, Kamberović, Željko, Nikolić, Vesna, Marković, Branislav, Korać, Marija, Anđić, Zoran, Gavrilovski, Milorad, "Kinetics of NiO and NiCl2 Hydrogen Reduction as Precursors and Properties of Produced Ni/Al2O3 and Ni-Pd/Al2O3 Catalysts" in The Scientific World Journal, 2015 (2015):1-9,
https://doi.org/10.1155/2015/601970 . .

TY  - JOUR
AU  - Jović-Jovičić, Nataša
AU  - Milutinović-Nikolić, Aleksandra D.
AU  - Gržetić, Ivan
AU  - Banković, Predrag
AU  - Marković, Branislav Z.
AU  - Jovanović, Dušan M.
PY  - 2008
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/954
AB  - Natural bentonite clay from the Bogovina locality in Serbia was Na-exchanged and modified using hexadecyll-trimethylammonium bromide as surfactant and organobentonite was obtained. The influence of modifications on the structural, textural and sorption properties of bentonite was investigated. It was estimated that modifications solely replace exchangeable cations in smectite layers, whereas other admixture minerals (quartz, calcite, feldspar) in bentonite remain unaffected. According to X-ray results the modification lead to changes in the smectite structure by either decreasing, for Na-bentonite, or increasing, for organobentonite, the interplanar spacing, d(001). The appearance of three new bands in IR spectra of HDTMA-bentonite comparing to those of raw and Na-bentonite assigned to the methylene vibrations confirmed the embedding of aliphatic cations into smectite structure. In organobentonite a significant change in textural properties was observed. In particular, specific surface area dramatically decreased while originally meso and microporous material became almost completely non-porous. Despite almost insignificant specific surface area the synthesized organobentonite due to gained organophyllity of its surface exhibits exquisite adsorption properties toward investigated textile dyes having adsorption capacity approx. 2 times higher than activated carbon.
AB  - Prirodna bentonitna glina sa lokaliteta Bogovina u Srbiji je natrijumski izmenjena i modifikovana heksadeciltrimetil amonijum-bromidom kao surfaktantom, pri čemu je dobijen organobentonit. Ispitivan je uticaj modifikacije na strukturu, teksturalna i adsorpciona svojstva bentonita. Utvrđeno je da primenjeni postupci modifikacije dovode isključivo do izmene katjona u medulamelamom sloju smektita, dok modifikacija ne deluje na druge prateće minerale u bentonitu (kvare, kalcit, feldspat). Uprkos neznatnoj specifičnoj površini sintetizovani organobentonit zahvaljujući novodobijenoj organofilnosti površine pokazuje izuzetna adsorpciona svojstva prema tekstilnim bojama, imajući adsorpcioni kapacitet oko 2 puta veći od aktivnog uglja.
PB  - Assoc Chemical Engineers Serbia, Belgrade
T2  - Hemijska industrija
T1  - The influence of modification on structural, textural and adsorption properties of bentonite
T1  - Uticaj modifikacije na strukturna, teksturalna i adsorpciona svojstva bentonita
VL  - 62
IS  - 3
SP  - 131
EP  - 137
DO  - 10.2298/HEMIND0803131J
ER  - 

@article{
author = "Jović-Jovičić, Nataša and Milutinović-Nikolić, Aleksandra D. and Gržetić, Ivan and Banković, Predrag and Marković, Branislav Z. and Jovanović, Dušan M.",
year = "2008",
abstract = "Natural bentonite clay from the Bogovina locality in Serbia was Na-exchanged and modified using hexadecyll-trimethylammonium bromide as surfactant and organobentonite was obtained. The influence of modifications on the structural, textural and sorption properties of bentonite was investigated. It was estimated that modifications solely replace exchangeable cations in smectite layers, whereas other admixture minerals (quartz, calcite, feldspar) in bentonite remain unaffected. According to X-ray results the modification lead to changes in the smectite structure by either decreasing, for Na-bentonite, or increasing, for organobentonite, the interplanar spacing, d(001). The appearance of three new bands in IR spectra of HDTMA-bentonite comparing to those of raw and Na-bentonite assigned to the methylene vibrations confirmed the embedding of aliphatic cations into smectite structure. In organobentonite a significant change in textural properties was observed. In particular, specific surface area dramatically decreased while originally meso and microporous material became almost completely non-porous. Despite almost insignificant specific surface area the synthesized organobentonite due to gained organophyllity of its surface exhibits exquisite adsorption properties toward investigated textile dyes having adsorption capacity approx. 2 times higher than activated carbon., Prirodna bentonitna glina sa lokaliteta Bogovina u Srbiji je natrijumski izmenjena i modifikovana heksadeciltrimetil amonijum-bromidom kao surfaktantom, pri čemu je dobijen organobentonit. Ispitivan je uticaj modifikacije na strukturu, teksturalna i adsorpciona svojstva bentonita. Utvrđeno je da primenjeni postupci modifikacije dovode isključivo do izmene katjona u medulamelamom sloju smektita, dok modifikacija ne deluje na druge prateće minerale u bentonitu (kvare, kalcit, feldspat). Uprkos neznatnoj specifičnoj površini sintetizovani organobentonit zahvaljujući novodobijenoj organofilnosti površine pokazuje izuzetna adsorpciona svojstva prema tekstilnim bojama, imajući adsorpcioni kapacitet oko 2 puta veći od aktivnog uglja.",
publisher = "Assoc Chemical Engineers Serbia, Belgrade",
journal = "Hemijska industrija",
title = "The influence of modification on structural, textural and adsorption properties of bentonite, Uticaj modifikacije na strukturna, teksturalna i adsorpciona svojstva bentonita",
volume = "62",
number = "3",
pages = "131-137",
doi = "10.2298/HEMIND0803131J"
}

Jović-Jovičić, N., Milutinović-Nikolić, A. D., Gržetić, I., Banković, P., Marković, B. Z.,& Jovanović, D. M.. (2008). The influence of modification on structural, textural and adsorption properties of bentonite. in Hemijska industrija
Assoc Chemical Engineers Serbia, Belgrade., 62(3), 131-137.
https://doi.org/10.2298/HEMIND0803131J

Jović-Jovičić N, Milutinović-Nikolić AD, Gržetić I, Banković P, Marković BZ, Jovanović DM. The influence of modification on structural, textural and adsorption properties of bentonite. in Hemijska industrija. 2008;62(3):131-137.
doi:10.2298/HEMIND0803131J .

Jović-Jovičić, Nataša, Milutinović-Nikolić, Aleksandra D., Gržetić, Ivan, Banković, Predrag, Marković, Branislav Z., Jovanović, Dušan M., "The influence of modification on structural, textural and adsorption properties of bentonite" in Hemijska industrija, 62, no. 3 (2008):131-137,
https://doi.org/10.2298/HEMIND0803131J . .