TY  - CONF
AU  - Vučinić, Dušica
AU  - Radulović, Dragan
PY  - 2016
UR  - https://ritnms.itnms.ac.rs/handle/123456789/1033
AB  - The stability of lead ethyl xanthate (ethyl xantate ion C2H5OCS2- , EX-) on galena (PbS) surface in an alkaline medium (pH=9-12) was investigated using ATR-IR and UV spectrophotometric methods. The prolonged time of mineral treatment with ethyl xanthate solution up to 4 hours, at pH=9.2, did not affect the surface adsorbed ethyl xanthate. However, within pH range 10-12, the decomposition of surface layer occurs. The ethyl monothiocarbonate ion EMTC- (monothiocarbonateCO2S2− ) is an intermediate product of lead ethyl xanthate decomposition.
PB  - Belgrade : Society of Physical Chemists of Serbia
C3  - 13th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Stability of lead ethyl xanthate on galena surface
EP  - 30
SP  - 26
ER  - 

@conference{
author = "Vučinić, Dušica and Radulović, Dragan",
year = "2016",
abstract = "The stability of lead ethyl xanthate (ethyl xantate ion C2H5OCS2- , EX-) on galena (PbS) surface in an alkaline medium (pH=9-12) was investigated using ATR-IR and UV spectrophotometric methods. The prolonged time of mineral treatment with ethyl xanthate solution up to 4 hours, at pH=9.2, did not affect the surface adsorbed ethyl xanthate. However, within pH range 10-12, the decomposition of surface layer occurs. The ethyl monothiocarbonate ion EMTC- (monothiocarbonateCO2S2− ) is an intermediate product of lead ethyl xanthate decomposition.",
publisher = "Belgrade : Society of Physical Chemists of Serbia",
journal = "13th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Stability of lead ethyl xanthate on galena surface",
pages = "30-26"
}

Vučinić, D.,& Radulović, D.. (2016). Stability of lead ethyl xanthate on galena surface. in 13th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Belgrade : Society of Physical Chemists of Serbia., 26-30.

Vučinić D, Radulović D. Stability of lead ethyl xanthate on galena surface. in 13th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2016;:26-30..

Vučinić, Dušica, Radulović, Dragan, "Stability of lead ethyl xanthate on galena surface" in 13th International Conference on Fundamental and Applied Aspects of Physical Chemistry (2016):26-30.

TY  - JOUR
AU  - Radulović, Dragan
AU  - Mihajlović, Slavica
AU  - Sekulić, Živko
AU  - Vučinić, Dušica
PY  - 2014
UR  - https://ritnms.itnms.ac.rs/handle/123456789/305
AB  - U radu je prikazan značaj fosfata u svetu, kao i problemi koji se javljaju u postupku pripreme siromašnijih ruda fosfata iz kojih se koncentrat fosfata dobija postupkom flotacijske koncentracije. Selektivnim flotiranjem aptita iz silikatnih i oksidnih ruda se dobijaju koncentrati apatita, dok definisanje postupka selektivnog flotiranja apatita iz karbonatnih ležišta predstavlja veliki problem u svetskim razmerama. U eksperimentalnom delu ovoga rada su prikazani rezultati laboratorijskih opita flotiranja rude fosfata iz ležišta 'Lisina'- sa površinskog dela -lokalitet 'Panjevica'. Dobijeni rezultati su omogućili definisanje postupka flotiranja u kontinualnim uslovima rada.
AB  - This paper presents the importance of phosphate in the world, and the problems that arise in the process of preparing the low-grade phosphate ore for obtaining the phosphate concentrate using the flotation concentration. The apatite concentrates are obtained using the selective flotation from the silicate and oxide minerals while defining the process of selective flotation of apatite from carbonate deposits is the major problem worldwide. The experimental part of this paper presents the results of laboratory flotation tests of phosphate ore from the surface part of the location 'Panjevica' of the deposit 'Lisina'. The results have enabled definition of the flotation process in continuous conditions of work.
PB  - Institut za rudarstvo i metalurgiju, Bor
T2  - Mining and Metallurgy Engineering Bor
T1  - Definisanje tehnološkog postupka flotacijske koncentracije apatita iz rude fosfata 'Lisina'
T1  - Definition the technology method of apatite flotation concentration from the phosphate deposit 'Lisina'
EP  - 146
IS  - 2
SP  - 131
DO  - 10.5937/mmeb1402131r
UR  - conv_419
ER  - 

@article{
author = "Radulović, Dragan and Mihajlović, Slavica and Sekulić, Živko and Vučinić, Dušica",
year = "2014",
abstract = "U radu je prikazan značaj fosfata u svetu, kao i problemi koji se javljaju u postupku pripreme siromašnijih ruda fosfata iz kojih se koncentrat fosfata dobija postupkom flotacijske koncentracije. Selektivnim flotiranjem aptita iz silikatnih i oksidnih ruda se dobijaju koncentrati apatita, dok definisanje postupka selektivnog flotiranja apatita iz karbonatnih ležišta predstavlja veliki problem u svetskim razmerama. U eksperimentalnom delu ovoga rada su prikazani rezultati laboratorijskih opita flotiranja rude fosfata iz ležišta 'Lisina'- sa površinskog dela -lokalitet 'Panjevica'. Dobijeni rezultati su omogućili definisanje postupka flotiranja u kontinualnim uslovima rada., This paper presents the importance of phosphate in the world, and the problems that arise in the process of preparing the low-grade phosphate ore for obtaining the phosphate concentrate using the flotation concentration. The apatite concentrates are obtained using the selective flotation from the silicate and oxide minerals while defining the process of selective flotation of apatite from carbonate deposits is the major problem worldwide. The experimental part of this paper presents the results of laboratory flotation tests of phosphate ore from the surface part of the location 'Panjevica' of the deposit 'Lisina'. The results have enabled definition of the flotation process in continuous conditions of work.",
publisher = "Institut za rudarstvo i metalurgiju, Bor",
journal = "Mining and Metallurgy Engineering Bor",
title = "Definisanje tehnološkog postupka flotacijske koncentracije apatita iz rude fosfata 'Lisina', Definition the technology method of apatite flotation concentration from the phosphate deposit 'Lisina'",
pages = "146-131",
number = "2",
doi = "10.5937/mmeb1402131r",
url = "conv_419"
}

Radulović, D., Mihajlović, S., Sekulić, Ž.,& Vučinić, D.. (2014). Definisanje tehnološkog postupka flotacijske koncentracije apatita iz rude fosfata 'Lisina'. in Mining and Metallurgy Engineering Bor
Institut za rudarstvo i metalurgiju, Bor.(2), 131-146.
https://doi.org/10.5937/mmeb1402131r
conv_419

Radulović D, Mihajlović S, Sekulić Ž, Vučinić D. Definisanje tehnološkog postupka flotacijske koncentracije apatita iz rude fosfata 'Lisina'. in Mining and Metallurgy Engineering Bor. 2014;(2):131-146.
doi:10.5937/mmeb1402131r
conv_419 .

Radulović, Dragan, Mihajlović, Slavica, Sekulić, Živko, Vučinić, Dušica, "Definisanje tehnološkog postupka flotacijske koncentracije apatita iz rude fosfata 'Lisina'" in Mining and Metallurgy Engineering Bor, no. 2 (2014):131-146,
https://doi.org/10.5937/mmeb1402131r .,
conv_419 .

TY  - JOUR
AU  - Mihajlović, Slavica
AU  - Vučinić, Dušica
AU  - Sekulić, Živko
AU  - Milićević, Sonja
AU  - Kolonja, Božo M.
PY  - 2013
UR  - https://ritnms.itnms.ac.rs/handle/123456789/257
AB  - This paper presents the interpretation of binding mechanism of stearic acid for calcite surface in two modification methods. In the "dry" method, a surface dissociation of stearic acid is assumed where H+ ion goes to a surface carbonate ion and stearic ion is chemisorbed on primary surface center of -Ca+ ion which is only available for chemisorption. The structure of adsorbed layer indicates chemisorption of stearate, but due to steric effects, and the oblique or gauche conformation of hydrocarbon chains. A part of surface -Ca+ centers can be blocked, which is explained by the result that physical adsorption dominates over 1.5%. In the "wet" method, by adding stearic acid, at concentration above the critical concentration of micelle formation in base solution, micelles are formed, and on the other side free stearic acid molecules or molecules from developed micelle dissociate. The resulting stearic ions can be chemisorbed on primary centers of -Ca+ ions or participate in ion exchange with OH- ions from secondary surface centers. With increasing adsorption density, the adsorbed ions and molecules, due to interactions of hydrocarbon chains, and thickness of double electrical layer, achieve a vertical orientation and keep the trans-conformation of hydrocarbon chains.
PB  - Elsevier, Amsterdam
T2  - Powder Technology
T1  - Mechanism of stearic acid adsorption to calcite
EP  - 216
SP  - 208
VL  - 245
DO  - 10.1016/j.powtec.2013.04.041
UR  - conv_661
ER  - 

@article{
author = "Mihajlović, Slavica and Vučinić, Dušica and Sekulić, Živko and Milićević, Sonja and Kolonja, Božo M.",
year = "2013",
abstract = "This paper presents the interpretation of binding mechanism of stearic acid for calcite surface in two modification methods. In the "dry" method, a surface dissociation of stearic acid is assumed where H+ ion goes to a surface carbonate ion and stearic ion is chemisorbed on primary surface center of -Ca+ ion which is only available for chemisorption. The structure of adsorbed layer indicates chemisorption of stearate, but due to steric effects, and the oblique or gauche conformation of hydrocarbon chains. A part of surface -Ca+ centers can be blocked, which is explained by the result that physical adsorption dominates over 1.5%. In the "wet" method, by adding stearic acid, at concentration above the critical concentration of micelle formation in base solution, micelles are formed, and on the other side free stearic acid molecules or molecules from developed micelle dissociate. The resulting stearic ions can be chemisorbed on primary centers of -Ca+ ions or participate in ion exchange with OH- ions from secondary surface centers. With increasing adsorption density, the adsorbed ions and molecules, due to interactions of hydrocarbon chains, and thickness of double electrical layer, achieve a vertical orientation and keep the trans-conformation of hydrocarbon chains.",
publisher = "Elsevier, Amsterdam",
journal = "Powder Technology",
title = "Mechanism of stearic acid adsorption to calcite",
pages = "216-208",
volume = "245",
doi = "10.1016/j.powtec.2013.04.041",
url = "conv_661"
}

Mihajlović, S., Vučinić, D., Sekulić, Ž., Milićević, S.,& Kolonja, B. M.. (2013). Mechanism of stearic acid adsorption to calcite. in Powder Technology
Elsevier, Amsterdam., 245, 208-216.
https://doi.org/10.1016/j.powtec.2013.04.041
conv_661

Mihajlović S, Vučinić D, Sekulić Ž, Milićević S, Kolonja BM. Mechanism of stearic acid adsorption to calcite. in Powder Technology. 2013;245:208-216.
doi:10.1016/j.powtec.2013.04.041
conv_661 .

Mihajlović, Slavica, Vučinić, Dušica, Sekulić, Živko, Milićević, Sonja, Kolonja, Božo M., "Mechanism of stearic acid adsorption to calcite" in Powder Technology, 245 (2013):208-216,
https://doi.org/10.1016/j.powtec.2013.04.041 .,
conv_661 .

TY  - JOUR
AU  - Mihajlović, Slavica
AU  - Sekulić, Živko
AU  - Vučinić, Dušica
AU  - Jovanović, Vladimir
AU  - Kolonja, Božo M.
PY  - 2012
UR  - https://ritnms.itnms.ac.rs/handle/123456789/227
AB  - U radu su prikazani rezultati ispitivanja mehaničkih osobina (zatezna čvrstoća, zatezno izduženje, prekidna čvrstoća i prekidno izduženje) na PVC mešavinama koje sadrže PVC (polivinil-hlorid), stabilizator, klizno sredstvo i punilac. Kao punilac korišćen je nemodifikovani kalcit i uzorci kalcita modifikovani stearinskom kiselinom suvim i mokrim postupkom. Rezultati ispitivanja su pokazali da PVC mešavina, koja sadrži kalcit modifikovan mokrim postupkom ima bolje mehaničke osobine od one mešavine koja sadrži kalcit modifikovan suvim postupkom. Tako je čvrstoća pri zatezanju PVC mešavine koja sadrži kalcit modifikovan sa 1,5% stearinske kiseline mokrim postupkom za 2,84% veća u odnosu na čvrstoću pri zatezanju PVC mešavine, koja sadrži kalcit modifikovan sa istim sadržajem stearinske kiseline, ali suvim postupkom.
AB  - In this study, mechanical properties of PVC mixtures (PVC, stabilizer, lubricant and filler) such as tensile strength, tensile elongation, breaking strength and breaking elongation were investigated. Unmodified calcite, as well as calcite modified by stearic acid, were used as fillers in wet and dry processes. The PVC mixtures containing the calcite modified by wet procedure had better mechanical properties compared to those with the calcite modified by the dry process. Tensile and breaking strength of the PVC mixture containing the calcite modified with 1.5% stearic acid using the wet process were higher for 2.8 and 5.2%, respectively, compared to the PVC mixture containing the calcite modified with the same amount of acid used in the dry process. The tensile strength difference between the mixtures increased with the increase of the concentration of used stearic acid up to 3%. The strength of PVC mixture with the calcite modified by the wet process was 3.1% higher compared to the mixture containing calcite modified by dry process. The results showed that the bonding strength between calcite and the adsorbed organic component affected tensile strength, tensile elongation and breaking strength of the PVC mixtures. The best filler was obtained by wet modification using 1.5% stearic acid solution that provided the formation of a stearate monolayer chemisorbed on calcite. The PVC mixtures containing the calcite modified by wet process using 1.5% stearic acid solution exhibited the best mechanical properties. This calcite was completely hydrophobic with dominant chemically adsorbed surfactant, which means that stearate chemisorbed on calcite provided stronger interaction in the calcite-stearic acid-PVC system.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Ispitivanje mehaničkih osobina polivinil-hlorida sa dodatkom modifikovanog kalcita kao punioca
T1  - Mechanical properties of polyvinyl chloride mixtures with the addition of modified calcite as filler
EP  - 794
IS  - 5
SP  - 787
VL  - 66
DO  - 10.2298/HEMIND111115025M
UR  - conv_298
ER  - 

@article{
author = "Mihajlović, Slavica and Sekulić, Živko and Vučinić, Dušica and Jovanović, Vladimir and Kolonja, Božo M.",
year = "2012",
abstract = "U radu su prikazani rezultati ispitivanja mehaničkih osobina (zatezna čvrstoća, zatezno izduženje, prekidna čvrstoća i prekidno izduženje) na PVC mešavinama koje sadrže PVC (polivinil-hlorid), stabilizator, klizno sredstvo i punilac. Kao punilac korišćen je nemodifikovani kalcit i uzorci kalcita modifikovani stearinskom kiselinom suvim i mokrim postupkom. Rezultati ispitivanja su pokazali da PVC mešavina, koja sadrži kalcit modifikovan mokrim postupkom ima bolje mehaničke osobine od one mešavine koja sadrži kalcit modifikovan suvim postupkom. Tako je čvrstoća pri zatezanju PVC mešavine koja sadrži kalcit modifikovan sa 1,5% stearinske kiseline mokrim postupkom za 2,84% veća u odnosu na čvrstoću pri zatezanju PVC mešavine, koja sadrži kalcit modifikovan sa istim sadržajem stearinske kiseline, ali suvim postupkom., In this study, mechanical properties of PVC mixtures (PVC, stabilizer, lubricant and filler) such as tensile strength, tensile elongation, breaking strength and breaking elongation were investigated. Unmodified calcite, as well as calcite modified by stearic acid, were used as fillers in wet and dry processes. The PVC mixtures containing the calcite modified by wet procedure had better mechanical properties compared to those with the calcite modified by the dry process. Tensile and breaking strength of the PVC mixture containing the calcite modified with 1.5% stearic acid using the wet process were higher for 2.8 and 5.2%, respectively, compared to the PVC mixture containing the calcite modified with the same amount of acid used in the dry process. The tensile strength difference between the mixtures increased with the increase of the concentration of used stearic acid up to 3%. The strength of PVC mixture with the calcite modified by the wet process was 3.1% higher compared to the mixture containing calcite modified by dry process. The results showed that the bonding strength between calcite and the adsorbed organic component affected tensile strength, tensile elongation and breaking strength of the PVC mixtures. The best filler was obtained by wet modification using 1.5% stearic acid solution that provided the formation of a stearate monolayer chemisorbed on calcite. The PVC mixtures containing the calcite modified by wet process using 1.5% stearic acid solution exhibited the best mechanical properties. This calcite was completely hydrophobic with dominant chemically adsorbed surfactant, which means that stearate chemisorbed on calcite provided stronger interaction in the calcite-stearic acid-PVC system.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Ispitivanje mehaničkih osobina polivinil-hlorida sa dodatkom modifikovanog kalcita kao punioca, Mechanical properties of polyvinyl chloride mixtures with the addition of modified calcite as filler",
pages = "794-787",
number = "5",
volume = "66",
doi = "10.2298/HEMIND111115025M",
url = "conv_298"
}

Mihajlović, S., Sekulić, Ž., Vučinić, D., Jovanović, V.,& Kolonja, B. M.. (2012). Ispitivanje mehaničkih osobina polivinil-hlorida sa dodatkom modifikovanog kalcita kao punioca. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 66(5), 787-794.
https://doi.org/10.2298/HEMIND111115025M
conv_298

Mihajlović S, Sekulić Ž, Vučinić D, Jovanović V, Kolonja BM. Ispitivanje mehaničkih osobina polivinil-hlorida sa dodatkom modifikovanog kalcita kao punioca. in Hemijska industrija. 2012;66(5):787-794.
doi:10.2298/HEMIND111115025M
conv_298 .

Mihajlović, Slavica, Sekulić, Živko, Vučinić, Dušica, Jovanović, Vladimir, Kolonja, Božo M., "Ispitivanje mehaničkih osobina polivinil-hlorida sa dodatkom modifikovanog kalcita kao punioca" in Hemijska industrija, 66, no. 5 (2012):787-794,
https://doi.org/10.2298/HEMIND111115025M .,
conv_298 .

TY  - JOUR
AU  - Vučinić, Dušica
AU  - Radulović, Dragan
AU  - Deusić, Slaven D.
PY  - 2010
UR  - https://ritnms.itnms.ac.rs/handle/123456789/174
AB  - The effect of calcite supernatant, calcium, and carbonate ions on the hydroxyapatite (HA) zeta potential without and in the presence of sodium oleate (1 x 10(-4) mol L-1) was examined within the pH range from 4 to 12. The interpretation of results was based on the HA Surface and oleate solution chemistry, and on some floatability tests. HA, with different positive and negative Surface sites formed depending on its solubility and pH, had a negative zeta potential over the whole pH range. This mineral is not naturally floatable (flotation recovery, 5%  LT  R  LT  18%). The oleate ions (OI-), present in a very low concentration in an acidic medium (pH from 4.8 to 6), chemisorb individually on HA surface centers Ca+, HPO4Ca+, and OH2+, increasing the negative zeta potential of the mineral. Within the pH range from 7 to 9, the dominant oleate species OI- ion and ion-molecule complex, H(OI)(2)(+), adsorbed on HA by head groups toward the solid and associated due to chain-chain interaction in hemimicelles, made the HA surf ace with zeta potential about -22/-23 mV, and more floatable (R = 80-100%) than in 4  LT  pH  LT  7 (R = 15-35%) or in pH > 9.3. The HA surface is less negatively charged in calcite supernatant than in water from pH 6.6 to 9.2 due to the adsorption on HA negative surface active centers ( HPO4- and PO42+) of the Ca2+, CaHCO3+, and CaOH+ ions (present in the calcite supernatant), producing m re surface sites PO4Ca, HPO4CaOH, and PO4- CaOH, and new centers HPO4CaHCO3 and PO4- CaHCO3. In the presence of 1 x 10(-3) mol L-1 CaCl2, the HA sample has positive zeta potential, the same as calcite from the same deposit, up to IEP at pH 11.25. Carbonate ions (1 x 10(-3) mol L-1 Na2CO3) do not affect the HA zeta potential. However, a possible process can be the ion-exchange reaction between bicarbonate (or carbonate) and some anion from the surface sites formed on HA. The obtained values of the HA zeta potential with the collector (1 x 10(-4) mol L-1 Na-oleate) added into hydroxyapatite/calcite Supernatant suspensions corroborate the weak chemisorption of OI- and H(OI)(2)(-). The likely processes in this system also are the ion-exchange reactions on HPO4CaOH and PO4- CaOH, HPO4CaHCO3 and PO4- CaHCO3 between oleate ion and surface hydroxyl and bicarbonate ions, Surface and bulk precipitations of calcium oleate. Ca(OI)(2), and the Surface and bulk precipitations of Ca[H(OI)(2)(-)](2) over the pH range from 7 to 9. Calcite Supernatant does not influence natural floatability of the mineral. However, calcite Supernatant depresses the hydroxyapatite flotation in the presence of 1 x 10(-4) mol L-1 Na-oleate (pH 9, R similar to 50%), a likely result of the weak chemisorption due to the steric effect of heterogeneous HA surface formed in calcite supernatant, Ca(OI)(2) and Ca[H(OI)(2)(-)](2) surface and bulk precipitations.
PB  - Academic Press Inc Elsevier Science, San Diego
T2  - Journal of Colloid and Interface Science
T1  - Electrokinetic properties of hydroxyapatite under flotation conditions
EP  - 245
IS  - 1
SP  - 239
VL  - 343
DO  - 10.1016/j.jcis.2009.11.024
UR  - conv_575
ER  - 

@article{
author = "Vučinić, Dušica and Radulović, Dragan and Deusić, Slaven D.",
year = "2010",
abstract = "The effect of calcite supernatant, calcium, and carbonate ions on the hydroxyapatite (HA) zeta potential without and in the presence of sodium oleate (1 x 10(-4) mol L-1) was examined within the pH range from 4 to 12. The interpretation of results was based on the HA Surface and oleate solution chemistry, and on some floatability tests. HA, with different positive and negative Surface sites formed depending on its solubility and pH, had a negative zeta potential over the whole pH range. This mineral is not naturally floatable (flotation recovery, 5%  LT  R  LT  18%). The oleate ions (OI-), present in a very low concentration in an acidic medium (pH from 4.8 to 6), chemisorb individually on HA surface centers Ca+, HPO4Ca+, and OH2+, increasing the negative zeta potential of the mineral. Within the pH range from 7 to 9, the dominant oleate species OI- ion and ion-molecule complex, H(OI)(2)(+), adsorbed on HA by head groups toward the solid and associated due to chain-chain interaction in hemimicelles, made the HA surf ace with zeta potential about -22/-23 mV, and more floatable (R = 80-100%) than in 4  LT  pH  LT  7 (R = 15-35%) or in pH > 9.3. The HA surface is less negatively charged in calcite supernatant than in water from pH 6.6 to 9.2 due to the adsorption on HA negative surface active centers ( HPO4- and PO42+) of the Ca2+, CaHCO3+, and CaOH+ ions (present in the calcite supernatant), producing m re surface sites PO4Ca, HPO4CaOH, and PO4- CaOH, and new centers HPO4CaHCO3 and PO4- CaHCO3. In the presence of 1 x 10(-3) mol L-1 CaCl2, the HA sample has positive zeta potential, the same as calcite from the same deposit, up to IEP at pH 11.25. Carbonate ions (1 x 10(-3) mol L-1 Na2CO3) do not affect the HA zeta potential. However, a possible process can be the ion-exchange reaction between bicarbonate (or carbonate) and some anion from the surface sites formed on HA. The obtained values of the HA zeta potential with the collector (1 x 10(-4) mol L-1 Na-oleate) added into hydroxyapatite/calcite Supernatant suspensions corroborate the weak chemisorption of OI- and H(OI)(2)(-). The likely processes in this system also are the ion-exchange reactions on HPO4CaOH and PO4- CaOH, HPO4CaHCO3 and PO4- CaHCO3 between oleate ion and surface hydroxyl and bicarbonate ions, Surface and bulk precipitations of calcium oleate. Ca(OI)(2), and the Surface and bulk precipitations of Ca[H(OI)(2)(-)](2) over the pH range from 7 to 9. Calcite Supernatant does not influence natural floatability of the mineral. However, calcite Supernatant depresses the hydroxyapatite flotation in the presence of 1 x 10(-4) mol L-1 Na-oleate (pH 9, R similar to 50%), a likely result of the weak chemisorption due to the steric effect of heterogeneous HA surface formed in calcite supernatant, Ca(OI)(2) and Ca[H(OI)(2)(-)](2) surface and bulk precipitations.",
publisher = "Academic Press Inc Elsevier Science, San Diego",
journal = "Journal of Colloid and Interface Science",
title = "Electrokinetic properties of hydroxyapatite under flotation conditions",
pages = "245-239",
number = "1",
volume = "343",
doi = "10.1016/j.jcis.2009.11.024",
url = "conv_575"
}

Vučinić, D., Radulović, D.,& Deusić, S. D.. (2010). Electrokinetic properties of hydroxyapatite under flotation conditions. in Journal of Colloid and Interface Science
Academic Press Inc Elsevier Science, San Diego., 343(1), 239-245.
https://doi.org/10.1016/j.jcis.2009.11.024
conv_575

Vučinić D, Radulović D, Deusić SD. Electrokinetic properties of hydroxyapatite under flotation conditions. in Journal of Colloid and Interface Science. 2010;343(1):239-245.
doi:10.1016/j.jcis.2009.11.024
conv_575 .

Vučinić, Dušica, Radulović, Dragan, Deusić, Slaven D., "Electrokinetic properties of hydroxyapatite under flotation conditions" in Journal of Colloid and Interface Science, 343, no. 1 (2010):239-245,
https://doi.org/10.1016/j.jcis.2009.11.024 .,
conv_575 .

TY  - JOUR
AU  - Mihajlović, Slavica
AU  - Sekulić, Živko
AU  - Daković, Aleksandra
AU  - Vučinić, Dušica
AU  - Jovanović, Vladimir
AU  - Stojanović, Jovica
PY  - 2009
UR  - https://ritnms.itnms.ac.rs/handle/123456789/164
AB  - In order to obtain hydrophobic material, the water suspension of natural limestone with the high content of calcite (>95%), was treated with different amounts (0.5-4%) of stearic acid dissolved in chloroform. Thermal analysis showed that at lower initial concentrations of stearic acid (up to 2%), surfactant molecules are chemisorbed on calcite surface, while at higher initial concentrations acid molecules are additionally physisorbed on mineral surface. XRPD analysis of starting calcite as well as two modified products with 1.5 and 3% of stearic acid indicated that modification of calcite surface with both amounts of stearic acid, did not cause any changes in the structure of calcite mineral. It was confirmed that long chain stearic acid, in presence of water, alters the calcite surface to strongly hydrophobic, where reaction between stearic acid and Ca2+ ions occurs. Thus, the chemisorption of stearic acid on the calcite surface is responsible for retaining the lower surfactant layer on a charged surface while hydrophobic bonding causes formation of the upper surfactant layer The optimal amount of stearic acid needed to cover the calcite surface with a monolayer of organic molecules lies between 1.5% and 2%.
PB  - University of Chemistry and Technology, Prague
T2  - Ceramics - Silikaty
T1  - Surface properties of natural calcite filler treated with stearic acid
EP  - 275
IS  - 4
SP  - 268
VL  - 53
UR  - conv_1089
ER  - 

@article{
author = "Mihajlović, Slavica and Sekulić, Živko and Daković, Aleksandra and Vučinić, Dušica and Jovanović, Vladimir and Stojanović, Jovica",
year = "2009",
abstract = "In order to obtain hydrophobic material, the water suspension of natural limestone with the high content of calcite (>95%), was treated with different amounts (0.5-4%) of stearic acid dissolved in chloroform. Thermal analysis showed that at lower initial concentrations of stearic acid (up to 2%), surfactant molecules are chemisorbed on calcite surface, while at higher initial concentrations acid molecules are additionally physisorbed on mineral surface. XRPD analysis of starting calcite as well as two modified products with 1.5 and 3% of stearic acid indicated that modification of calcite surface with both amounts of stearic acid, did not cause any changes in the structure of calcite mineral. It was confirmed that long chain stearic acid, in presence of water, alters the calcite surface to strongly hydrophobic, where reaction between stearic acid and Ca2+ ions occurs. Thus, the chemisorption of stearic acid on the calcite surface is responsible for retaining the lower surfactant layer on a charged surface while hydrophobic bonding causes formation of the upper surfactant layer The optimal amount of stearic acid needed to cover the calcite surface with a monolayer of organic molecules lies between 1.5% and 2%.",
publisher = "University of Chemistry and Technology, Prague",
journal = "Ceramics - Silikaty",
title = "Surface properties of natural calcite filler treated with stearic acid",
pages = "275-268",
number = "4",
volume = "53",
url = "conv_1089"
}

Mihajlović, S., Sekulić, Ž., Daković, A., Vučinić, D., Jovanović, V.,& Stojanović, J.. (2009). Surface properties of natural calcite filler treated with stearic acid. in Ceramics - Silikaty
University of Chemistry and Technology, Prague., 53(4), 268-275.
conv_1089

Mihajlović S, Sekulić Ž, Daković A, Vučinić D, Jovanović V, Stojanović J. Surface properties of natural calcite filler treated with stearic acid. in Ceramics - Silikaty. 2009;53(4):268-275.
conv_1089 .

Mihajlović, Slavica, Sekulić, Živko, Daković, Aleksandra, Vučinić, Dušica, Jovanović, Vladimir, Stojanović, Jovica, "Surface properties of natural calcite filler treated with stearic acid" in Ceramics - Silikaty, 53, no. 4 (2009):268-275,
conv_1089 .

TY  - JOUR
AU  - Radulović, Dragan
AU  - Vučinić, Dušica
PY  - 2009
UR  - https://ritnms.itnms.ac.rs/handle/123456789/170
AB  - U okviru ovog rada prikazani su rezultati merenja elektrokinetičkog potencijala apatita, u uslovima pod kojima se vrši flotiranje minerala apatita iz pulpe. Merenja su izvođena u unapred definisanom reagentnom režimu, vremenu kondicioniranja i sa pH vrednostima pri kojima su bili izvedeni opiti flotiranja. Takođe su izvršena merenja elektrokinetičkog potencijala (zeta potencijala) u kojima je ispitivan uticaj pojedinih jona na površinske osobine minerala apatita odnosno na elektrokinetički potencijal. Ovim merenjima je definisan način izmene površina apatita pri tačno određenim uslovima i unapred zadatim parametrima pulpe.
AB  - Results of apatite electrokinetic potential under the flotation conditions from the pulp was measured and results are presented in this paper. Measurements are realized in predefined reagent regime, conditioning time and pH values like as during the flotation test. Also, measurements of electrokinetic potential (zeta potential) were done in order to investigate influence of partial ions on surface properties of apatite mineral i.e. on electrokinetic potential. Method of surface apatite modification upon exactly defined conditions and predefined pulp parameters is determined by these measurements.
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika - Rudarstvo, geologija i metalurgija
T1  - Elektrokinetičke osobine apatita u uslovima njegovog flotiranja
T1  - Electrokinetic properties of apatite under flotation conditions
EP  - 5
IS  - 5
SP  - 1
VL  - 60
UR  - conv_83
ER  - 

@article{
author = "Radulović, Dragan and Vučinić, Dušica",
year = "2009",
abstract = "U okviru ovog rada prikazani su rezultati merenja elektrokinetičkog potencijala apatita, u uslovima pod kojima se vrši flotiranje minerala apatita iz pulpe. Merenja su izvođena u unapred definisanom reagentnom režimu, vremenu kondicioniranja i sa pH vrednostima pri kojima su bili izvedeni opiti flotiranja. Takođe su izvršena merenja elektrokinetičkog potencijala (zeta potencijala) u kojima je ispitivan uticaj pojedinih jona na površinske osobine minerala apatita odnosno na elektrokinetički potencijal. Ovim merenjima je definisan način izmene površina apatita pri tačno određenim uslovima i unapred zadatim parametrima pulpe., Results of apatite electrokinetic potential under the flotation conditions from the pulp was measured and results are presented in this paper. Measurements are realized in predefined reagent regime, conditioning time and pH values like as during the flotation test. Also, measurements of electrokinetic potential (zeta potential) were done in order to investigate influence of partial ions on surface properties of apatite mineral i.e. on electrokinetic potential. Method of surface apatite modification upon exactly defined conditions and predefined pulp parameters is determined by these measurements.",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika - Rudarstvo, geologija i metalurgija",
title = "Elektrokinetičke osobine apatita u uslovima njegovog flotiranja, Electrokinetic properties of apatite under flotation conditions",
pages = "5-1",
number = "5",
volume = "60",
url = "conv_83"
}

Radulović, D.,& Vučinić, D.. (2009). Elektrokinetičke osobine apatita u uslovima njegovog flotiranja. in Tehnika - Rudarstvo, geologija i metalurgija
Savez inženjera i tehničara Srbije, Beograd., 60(5), 1-5.
conv_83

Radulović D, Vučinić D. Elektrokinetičke osobine apatita u uslovima njegovog flotiranja. in Tehnika - Rudarstvo, geologija i metalurgija. 2009;60(5):1-5.
conv_83 .

Radulović, Dragan, Vučinić, Dušica, "Elektrokinetičke osobine apatita u uslovima njegovog flotiranja" in Tehnika - Rudarstvo, geologija i metalurgija, 60, no. 5 (2009):1-5,
conv_83 .

TY  - JOUR
AU  - Mihajlović, Slavica
AU  - Sekulić, Živko
AU  - Daković, Aleksandra
AU  - Vučinić, Dušica
AU  - Kragović, Milan
PY  - 2009
UR  - https://ritnms.itnms.ac.rs/handle/123456789/149
AB  - U radu su prikazani rezultati ispitivanja mehaničkih osobina PVC (polivinil hlorid) mešavine koja sadrži krečnjak sa kalcitom, kao osnovnim mineralom, modifikovanim stearinskom kiselinom 'suvim' i 'mokrim' postupkom. Ispitivano je: čvrstoća pri zatezanju, izduženje pri zatezanju, čvrstoća pri kidanju, izduženje pri kidanju i temperatura omekšavanja po Vikat-u. Rezultati su pokazali da PVC mešavina koja sadrži kalcit modifikovan 'mokrim' postupkom ima bolje mehaničke osobine od one koja sadrži kalcit modifikovan 'suvim' postupkom u uslovima kada je postignut najveći stepen obloženosti od 99.90%. Uzorak PVC mešavine koji sadrži kalcit modifikovan 'mokrim' postupkom sa 1.5% stearinske kiseline ima čvrstoću pri zatezanju 54.20 MPa i čvrstoću pri kidanju 38.20 MPa, dok uzorak koji sadrži kalcit modifikovan 'suvim' postupkom sa 3% stearinske kiseline ima čvrstoću pri zatezanju 53.20 MPa i čvrstoću pri kidanju 37.90 MPa. .
AB  - This paper presents the results of mechanical properties testing of the PVC (Polyvinyl Chloride) mix containing limestone with calcite, as a basic mineral, modified by stearic acid using wet and dry procedures. The following testing was conducted: ultimate tensile strength, tensile elongation, breaking strength, elongation at break, and Vikat softening temperature. The results showed that the PVC mix containing calcite which was modified by wet procedure had better mechanical properties than the PVC mix containing calcite modified by dry procedure in conditions when the highest degree of coating of 99.90% was achieved. The PVC mix sample containing calcite modified by wet procedure with 1.5% of stearic acid had ultimate tensile strength of 54.20MPa and breaking strength of 38.20MPa, while the sample containing calcite modified by dry procedure with 3% of stearic acid had ultimate tensile strength of 53.20MPa and breaking strength of 37.90MPa. .
PB  - Udruženje inženjera građevinarstva, geotehnike, arhitekture i urbanista "Izgradnja", Beograd
T2  - Izgradnja
T1  - Mehaničke osobine PVC mešavine koja sadrži modifikovani kalcit
T1  - Mechanical properties of the PVC mix containing modified calcite
EP  - 516
IS  - 11-12
SP  - 511
VL  - 63
UR  - conv_97
ER  - 

@article{
author = "Mihajlović, Slavica and Sekulić, Živko and Daković, Aleksandra and Vučinić, Dušica and Kragović, Milan",
year = "2009",
abstract = "U radu su prikazani rezultati ispitivanja mehaničkih osobina PVC (polivinil hlorid) mešavine koja sadrži krečnjak sa kalcitom, kao osnovnim mineralom, modifikovanim stearinskom kiselinom 'suvim' i 'mokrim' postupkom. Ispitivano je: čvrstoća pri zatezanju, izduženje pri zatezanju, čvrstoća pri kidanju, izduženje pri kidanju i temperatura omekšavanja po Vikat-u. Rezultati su pokazali da PVC mešavina koja sadrži kalcit modifikovan 'mokrim' postupkom ima bolje mehaničke osobine od one koja sadrži kalcit modifikovan 'suvim' postupkom u uslovima kada je postignut najveći stepen obloženosti od 99.90%. Uzorak PVC mešavine koji sadrži kalcit modifikovan 'mokrim' postupkom sa 1.5% stearinske kiseline ima čvrstoću pri zatezanju 54.20 MPa i čvrstoću pri kidanju 38.20 MPa, dok uzorak koji sadrži kalcit modifikovan 'suvim' postupkom sa 3% stearinske kiseline ima čvrstoću pri zatezanju 53.20 MPa i čvrstoću pri kidanju 37.90 MPa. ., This paper presents the results of mechanical properties testing of the PVC (Polyvinyl Chloride) mix containing limestone with calcite, as a basic mineral, modified by stearic acid using wet and dry procedures. The following testing was conducted: ultimate tensile strength, tensile elongation, breaking strength, elongation at break, and Vikat softening temperature. The results showed that the PVC mix containing calcite which was modified by wet procedure had better mechanical properties than the PVC mix containing calcite modified by dry procedure in conditions when the highest degree of coating of 99.90% was achieved. The PVC mix sample containing calcite modified by wet procedure with 1.5% of stearic acid had ultimate tensile strength of 54.20MPa and breaking strength of 38.20MPa, while the sample containing calcite modified by dry procedure with 3% of stearic acid had ultimate tensile strength of 53.20MPa and breaking strength of 37.90MPa. .",
publisher = "Udruženje inženjera građevinarstva, geotehnike, arhitekture i urbanista "Izgradnja", Beograd",
journal = "Izgradnja",
title = "Mehaničke osobine PVC mešavine koja sadrži modifikovani kalcit, Mechanical properties of the PVC mix containing modified calcite",
pages = "516-511",
number = "11-12",
volume = "63",
url = "conv_97"
}

Mihajlović, S., Sekulić, Ž., Daković, A., Vučinić, D.,& Kragović, M.. (2009). Mehaničke osobine PVC mešavine koja sadrži modifikovani kalcit. in Izgradnja
Udruženje inženjera građevinarstva, geotehnike, arhitekture i urbanista "Izgradnja", Beograd., 63(11-12), 511-516.
conv_97

Mihajlović S, Sekulić Ž, Daković A, Vučinić D, Kragović M. Mehaničke osobine PVC mešavine koja sadrži modifikovani kalcit. in Izgradnja. 2009;63(11-12):511-516.
conv_97 .

Mihajlović, Slavica, Sekulić, Živko, Daković, Aleksandra, Vučinić, Dušica, Kragović, Milan, "Mehaničke osobine PVC mešavine koja sadrži modifikovani kalcit" in Izgradnja, 63, no. 11-12 (2009):511-516,
conv_97 .