TY  - JOUR
AU  - Terzić, Anja
AU  - Andrić, Ljubiša
AU  - Stojanović, J.
AU  - Obradović, Nina
AU  - Kostović, M.
PY  - 2014
UR  - https://dais.sanu.ac.rs/123456789/667
AB  - The effect of vibratory mill induced mechanical activation on the change of the particle size, crystallinity and the phase transformations of the minerals present in the activated material, was studied with the purpose of decreasing of the sintering temperature of talc (Mg3Si4O10(OH)2) as raw material which is the basic component of the steatite ceramics. The aims of the conducted investigation were, also, increasing of the reactivity of the comminuted raw material and establishing of the optimal activation period. The properties of the activated talc induced by mechanical force were expressed in form of the grain inertia change which was measured by means of automatic grain counter. Mechanically activated grains are the most convenient mineral form for physical concentration since the energy change of the mill-material system is recorded on them. The effect of dry grinding on the structure, particle size and shape of talc was studied by means of XRD, DTA and SEM/EDS methods. Activation of talc produced an increase of the starting surface area value progressively from 4.5 m2/g up to a maximum of 108.5 m2/g achieved at 30 min. A subsequent decrease of rate of surface area change and the rate of size reduction were observed following the prolonged grinding. Talc activated in vibratory mill for optimal 30 min showed properties which positively influence the decrease of sintering temperature and the increase of the sintering rate of steatite ceramics. [Projekat Ministarstva nauke Republike Srbije, br. 172057, br. 45008 i br. 33007]
PB  - Belgrade : Interenational Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Mechanical activation as sintering pre-treatment of talc for steatite ceramics
SP  - 247
EP  - 258
VL  - 46
IS  - 2
DO  - 10.2298/SOS1402247T
UR  - https://hdl.handle.net/21.15107/rcub_dais_667
ER  - 

@article{
author = "Terzić, Anja and Andrić, Ljubiša and Stojanović, J. and Obradović, Nina and Kostović, M.",
year = "2014",
abstract = "The effect of vibratory mill induced mechanical activation on the change of the particle size, crystallinity and the phase transformations of the minerals present in the activated material, was studied with the purpose of decreasing of the sintering temperature of talc (Mg3Si4O10(OH)2) as raw material which is the basic component of the steatite ceramics. The aims of the conducted investigation were, also, increasing of the reactivity of the comminuted raw material and establishing of the optimal activation period. The properties of the activated talc induced by mechanical force were expressed in form of the grain inertia change which was measured by means of automatic grain counter. Mechanically activated grains are the most convenient mineral form for physical concentration since the energy change of the mill-material system is recorded on them. The effect of dry grinding on the structure, particle size and shape of talc was studied by means of XRD, DTA and SEM/EDS methods. Activation of talc produced an increase of the starting surface area value progressively from 4.5 m2/g up to a maximum of 108.5 m2/g achieved at 30 min. A subsequent decrease of rate of surface area change and the rate of size reduction were observed following the prolonged grinding. Talc activated in vibratory mill for optimal 30 min showed properties which positively influence the decrease of sintering temperature and the increase of the sintering rate of steatite ceramics. [Projekat Ministarstva nauke Republike Srbije, br. 172057, br. 45008 i br. 33007]",
publisher = "Belgrade : Interenational Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Mechanical activation as sintering pre-treatment of talc for steatite ceramics",
pages = "247-258",
volume = "46",
number = "2",
doi = "10.2298/SOS1402247T",
url = "https://hdl.handle.net/21.15107/rcub_dais_667"
}

Terzić, A., Andrić, L., Stojanović, J., Obradović, N.,& Kostović, M.. (2014). Mechanical activation as sintering pre-treatment of talc for steatite ceramics. in Science of Sintering
Belgrade : Interenational Institute for the Science of Sintering., 46(2), 247-258.
https://doi.org/10.2298/SOS1402247T
https://hdl.handle.net/21.15107/rcub_dais_667

Terzić A, Andrić L, Stojanović J, Obradović N, Kostović M. Mechanical activation as sintering pre-treatment of talc for steatite ceramics. in Science of Sintering. 2014;46(2):247-258.
doi:10.2298/SOS1402247T
https://hdl.handle.net/21.15107/rcub_dais_667 .

Terzić, Anja, Andrić, Ljubiša, Stojanović, J., Obradović, Nina, Kostović, M., "Mechanical activation as sintering pre-treatment of talc for steatite ceramics" in Science of Sintering, 46, no. 2 (2014):247-258,
https://doi.org/10.2298/SOS1402247T .,
https://hdl.handle.net/21.15107/rcub_dais_667 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Andrić, Ljubiša
AU  - Mitić, Vojislav V.
PY  - 2014
UR  - https://dais.sanu.ac.rs/123456789/665
AB  - A growing demand for refractory castables with advanced properties has given rise to a continuous technological evolution and highlighted the necessity for secondary raw materials reapplication even in refractory industry. For the experiment, refractory shotcretes with the same matrix composition were prepared from 30 wt% of high aluminate cement, 40 wt% of bauxite aggregate and 30 wt% of chamotte filler. The request for obtaining a low-cement castable is fulfilled by application of mechanically activated coal ash as microfiller in one of the bauxite shotcretes. The fly ash was activated by means of vibratory disc mill and ultra-centrifugal mill, and results were compared. The shotcrete samples were dried at 110 °C during 24 h to create specimens for investigation of mechanical and thermal properties. The properties have been studied at temperatures ranging from room temperature to adopted maximal temperature 1400 °C. At maximal 1400 °C, the bauxite shotcretes were mainly composed of anorthite, corundum, mullite and cristobalite. Mechanisms of hydration and sintering were investigated by means of differential thermal analysis (DTA) at three different heating rates. DTA measurements showed different activation energies for ordinary bauxite shotcrete and shotcrete with microfiller. The evolution of the refractory shotcretes properties was investigated and correlated with microstructural changes induced by temperature and microfiller addition. The combination of advantages in investigated refractory shotcretes makes them suitable for use in severe conditions at high temperature applications especially in refractory industries.
PB  - Elsevier
T2  - Ceramics International
T1  - Mechanically activated coal ash as refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation
SP  - 12055
EP  - 12065
VL  - 40
IS  - 8, Part A
DO  - 10.1016/j.ceramint.2014.04.045
UR  - https://hdl.handle.net/21.15107/rcub_dais_665
ER  - 

@article{
author = "Terzić, Anja and Andrić, Ljubiša and Mitić, Vojislav V.",
year = "2014",
abstract = "A growing demand for refractory castables with advanced properties has given rise to a continuous technological evolution and highlighted the necessity for secondary raw materials reapplication even in refractory industry. For the experiment, refractory shotcretes with the same matrix composition were prepared from 30 wt% of high aluminate cement, 40 wt% of bauxite aggregate and 30 wt% of chamotte filler. The request for obtaining a low-cement castable is fulfilled by application of mechanically activated coal ash as microfiller in one of the bauxite shotcretes. The fly ash was activated by means of vibratory disc mill and ultra-centrifugal mill, and results were compared. The shotcrete samples were dried at 110 °C during 24 h to create specimens for investigation of mechanical and thermal properties. The properties have been studied at temperatures ranging from room temperature to adopted maximal temperature 1400 °C. At maximal 1400 °C, the bauxite shotcretes were mainly composed of anorthite, corundum, mullite and cristobalite. Mechanisms of hydration and sintering were investigated by means of differential thermal analysis (DTA) at three different heating rates. DTA measurements showed different activation energies for ordinary bauxite shotcrete and shotcrete with microfiller. The evolution of the refractory shotcretes properties was investigated and correlated with microstructural changes induced by temperature and microfiller addition. The combination of advantages in investigated refractory shotcretes makes them suitable for use in severe conditions at high temperature applications especially in refractory industries.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Mechanically activated coal ash as refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation",
pages = "12055-12065",
volume = "40",
number = "8, Part A",
doi = "10.1016/j.ceramint.2014.04.045",
url = "https://hdl.handle.net/21.15107/rcub_dais_665"
}

Terzić, A., Andrić, L.,& Mitić, V. V.. (2014). Mechanically activated coal ash as refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation. in Ceramics International
Elsevier., 40(8, Part A), 12055-12065.
https://doi.org/10.1016/j.ceramint.2014.04.045
https://hdl.handle.net/21.15107/rcub_dais_665

Terzić A, Andrić L, Mitić VV. Mechanically activated coal ash as refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation. in Ceramics International. 2014;40(8, Part A):12055-12065.
doi:10.1016/j.ceramint.2014.04.045
https://hdl.handle.net/21.15107/rcub_dais_665 .

Terzić, Anja, Andrić, Ljubiša, Mitić, Vojislav V., "Mechanically activated coal ash as refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation" in Ceramics International, 40, no. 8, Part A (2014):12055-12065,
https://doi.org/10.1016/j.ceramint.2014.04.045 .,
https://hdl.handle.net/21.15107/rcub_dais_665 .