Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system
Ispitivanje uticaja mehaničke aktivacije smeše MgO-TiO2 na sintezu magnezijum-titanata
Autori
Đorđević, Nataša G.Vlahović, Milica
Martinović, Sanja
Mihajlović, Slavica
Vušović, Nenad M.
Sokić, Miroslav D.
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
In this study, a mixture of magnesium oxide and titanium dioxide was mechanically activated in order to investigate the possibility of mechanochemical synthesis of magnesium titanate. Mechanical activation was performed for 1000 min in a high-energy vibro mill (type MH954/3, KHD Humboldt Wedag AG, Germany). The mill is equipped with housing having a horizontally placed shutter. The cylindrical stainless steel working vessel, with inner dimensions of 40 mm in height and 170 mm in diameter, has working elements consisting of two free concentric stainless steel rings with a total weight of 3 kg. The engine power is 0.8 kW. Respecting the optimal amount of powder to be activated of 50-150 g and the stoichiometric ratio of the reactants in the equation presenting the chemical reaction of magnesium titanate synthesis, the starting amounts were 20.2 g (0.5 mol) of MgO and 39.9 g (0.5 mol) TiO2. During the experiments, X-ray diffraction analysis of the samples taken from the reaction system af...ter 60, 180, 330, and 1000 min of mechanical activation was performed. Atomic absorption spectrophotometry was used for chemical composition analysis of samples taken at different activation times. Based on the X-ray diffraction analysis results, it can be concluded that the greatest changes in the system took place at the very beginning of the mechanical activation due to the disturbance of the crystal structure of the initial components. X-ray diffraction analysis of the sample after 1000 min of activation showed complete amorphization of the mixture, but diffraction maxima characteristic for magnesium titanate were not identified. Therefore, the mechanical activation experiments were stopped. Evidently, the energy input was not sufficient to overcome the energy barrier to form a new chemical compound-magnesium titanate. The failure to synthesize magnesium titanate is explained by the low negative Gibbs energy value of-25.8 kJ/mol (despite the theoretical possibility that the reaction will happen), as well as by the amount of mechanical energy entered into the system during activation which was insufficient to obtain the reaction product. Although the synthesis of MgTiO3 was not achieved, significant results were obtained which identify models for further investigations of the possibility of mechanochemical reactions of alkaline earth metals and titanium dioxide.
U ovom radu izvršen je pokušaj mehanohemijske sinteze magnezijum titanata u visokoenergetskom mlinu sa torzionim oprugama i prstenastim radnim elementima. Teorijski, hemijska reakcija je moguća samo ako je Gibsova slobodna energija te reakcije negativna, odnosno ako je energetski sadržaj produkata reakcije na nižem nivou od energetskog sadržaja reaktanata. Na osnovu rezultata dobijenih u ovom istraživanju može se zaključiti da i pored dovedene mehaničke energije u sistem, prisutna slobodna energija nije bila dovoljna da se odigra reakcija između MgO i TiO2 i dobije magnezijum titanat kao produkt. Mehanička energija koja je predata reakcionom sistemu u mehano-hemijskom aktivatoru dovela je do rušenja kristalne strukture i amorfizacije reaktanata, što se vidi na prikazanim diftaktogramima, ali nije bila dovoljna za sintezu magnezijum titanata prema jednačini (1), pa bi u tom cilju bilo neophodno koristiti energetski jači uređaj koji bi polaznim komponentama predao veći sadržaj energije, ...čime bi se preskočila energetska barijera i omogućilo polaznim oksidima da uđu u hemijsku reakciju tokom mehaničke aktivacije.
Ključne reči:
Amorphization / High energy vibrating mill / Magnesium titanate / X-ray structural analysisIzvor:
Hemijska industrija, 2021, 75, 4, 213-225Izdavač:
- Belgrade : Association of the Chemical Engineers of Serbia
Finansiranje / projekti:
- Ministarstvo nauke, tehnološkog razvoja i inovacija Republike Srbije, institucionalno finansiranje - 200023 (Institut za tehnologiju nuklearnih i drugih mineralnih sirovina - ITNMS, Beograd) (RS-200023)
- Ministarstvo nauke, tehnološkog razvoja i inovacija Republike Srbije, institucionalno finansiranje - 200026 (Univerzitet u Beogradu, Institut za hemiju, tehnologiju i metalurgiju - IHTM) (RS-200026)
- Ministarstvo nauke, tehnološkog razvoja i inovacija Republike Srbije, institucionalno finansiranje - 200131 (Univerzitet u Beogradu, Tehnički fakultet u Boru) (RS-200131)
DOI: 10.2298/HEMIND210402022D
ISSN: 0367-598X; 0350-249X
WoS: 000694731000003
Scopus: 2-s2.0-85114339591
Institucija/grupa
IHTMTY - JOUR AU - Đorđević, Nataša G. AU - Vlahović, Milica AU - Martinović, Sanja AU - Mihajlović, Slavica AU - Vušović, Nenad M. AU - Sokić, Miroslav D. PY - 2021 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/4764 AB - In this study, a mixture of magnesium oxide and titanium dioxide was mechanically activated in order to investigate the possibility of mechanochemical synthesis of magnesium titanate. Mechanical activation was performed for 1000 min in a high-energy vibro mill (type MH954/3, KHD Humboldt Wedag AG, Germany). The mill is equipped with housing having a horizontally placed shutter. The cylindrical stainless steel working vessel, with inner dimensions of 40 mm in height and 170 mm in diameter, has working elements consisting of two free concentric stainless steel rings with a total weight of 3 kg. The engine power is 0.8 kW. Respecting the optimal amount of powder to be activated of 50-150 g and the stoichiometric ratio of the reactants in the equation presenting the chemical reaction of magnesium titanate synthesis, the starting amounts were 20.2 g (0.5 mol) of MgO and 39.9 g (0.5 mol) TiO2. During the experiments, X-ray diffraction analysis of the samples taken from the reaction system after 60, 180, 330, and 1000 min of mechanical activation was performed. Atomic absorption spectrophotometry was used for chemical composition analysis of samples taken at different activation times. Based on the X-ray diffraction analysis results, it can be concluded that the greatest changes in the system took place at the very beginning of the mechanical activation due to the disturbance of the crystal structure of the initial components. X-ray diffraction analysis of the sample after 1000 min of activation showed complete amorphization of the mixture, but diffraction maxima characteristic for magnesium titanate were not identified. Therefore, the mechanical activation experiments were stopped. Evidently, the energy input was not sufficient to overcome the energy barrier to form a new chemical compound-magnesium titanate. The failure to synthesize magnesium titanate is explained by the low negative Gibbs energy value of-25.8 kJ/mol (despite the theoretical possibility that the reaction will happen), as well as by the amount of mechanical energy entered into the system during activation which was insufficient to obtain the reaction product. Although the synthesis of MgTiO3 was not achieved, significant results were obtained which identify models for further investigations of the possibility of mechanochemical reactions of alkaline earth metals and titanium dioxide. AB - U ovom radu izvršen je pokušaj mehanohemijske sinteze magnezijum titanata u visokoenergetskom mlinu sa torzionim oprugama i prstenastim radnim elementima. Teorijski, hemijska reakcija je moguća samo ako je Gibsova slobodna energija te reakcije negativna, odnosno ako je energetski sadržaj produkata reakcije na nižem nivou od energetskog sadržaja reaktanata. Na osnovu rezultata dobijenih u ovom istraživanju može se zaključiti da i pored dovedene mehaničke energije u sistem, prisutna slobodna energija nije bila dovoljna da se odigra reakcija između MgO i TiO2 i dobije magnezijum titanat kao produkt. Mehanička energija koja je predata reakcionom sistemu u mehano-hemijskom aktivatoru dovela je do rušenja kristalne strukture i amorfizacije reaktanata, što se vidi na prikazanim diftaktogramima, ali nije bila dovoljna za sintezu magnezijum titanata prema jednačini (1), pa bi u tom cilju bilo neophodno koristiti energetski jači uređaj koji bi polaznim komponentama predao veći sadržaj energije, čime bi se preskočila energetska barijera i omogućilo polaznim oksidima da uđu u hemijsku reakciju tokom mehaničke aktivacije. PB - Belgrade : Association of the Chemical Engineers of Serbia T2 - Hemijska industrija T1 - Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system T1 - Ispitivanje uticaja mehaničke aktivacije smeše MgO-TiO2 na sintezu magnezijum-titanata VL - 75 IS - 4 SP - 213 EP - 225 DO - 10.2298/HEMIND210402022D ER -
@article{ author = "Đorđević, Nataša G. and Vlahović, Milica and Martinović, Sanja and Mihajlović, Slavica and Vušović, Nenad M. and Sokić, Miroslav D.", year = "2021", abstract = "In this study, a mixture of magnesium oxide and titanium dioxide was mechanically activated in order to investigate the possibility of mechanochemical synthesis of magnesium titanate. Mechanical activation was performed for 1000 min in a high-energy vibro mill (type MH954/3, KHD Humboldt Wedag AG, Germany). The mill is equipped with housing having a horizontally placed shutter. The cylindrical stainless steel working vessel, with inner dimensions of 40 mm in height and 170 mm in diameter, has working elements consisting of two free concentric stainless steel rings with a total weight of 3 kg. The engine power is 0.8 kW. Respecting the optimal amount of powder to be activated of 50-150 g and the stoichiometric ratio of the reactants in the equation presenting the chemical reaction of magnesium titanate synthesis, the starting amounts were 20.2 g (0.5 mol) of MgO and 39.9 g (0.5 mol) TiO2. During the experiments, X-ray diffraction analysis of the samples taken from the reaction system after 60, 180, 330, and 1000 min of mechanical activation was performed. Atomic absorption spectrophotometry was used for chemical composition analysis of samples taken at different activation times. Based on the X-ray diffraction analysis results, it can be concluded that the greatest changes in the system took place at the very beginning of the mechanical activation due to the disturbance of the crystal structure of the initial components. X-ray diffraction analysis of the sample after 1000 min of activation showed complete amorphization of the mixture, but diffraction maxima characteristic for magnesium titanate were not identified. Therefore, the mechanical activation experiments were stopped. Evidently, the energy input was not sufficient to overcome the energy barrier to form a new chemical compound-magnesium titanate. The failure to synthesize magnesium titanate is explained by the low negative Gibbs energy value of-25.8 kJ/mol (despite the theoretical possibility that the reaction will happen), as well as by the amount of mechanical energy entered into the system during activation which was insufficient to obtain the reaction product. Although the synthesis of MgTiO3 was not achieved, significant results were obtained which identify models for further investigations of the possibility of mechanochemical reactions of alkaline earth metals and titanium dioxide., U ovom radu izvršen je pokušaj mehanohemijske sinteze magnezijum titanata u visokoenergetskom mlinu sa torzionim oprugama i prstenastim radnim elementima. Teorijski, hemijska reakcija je moguća samo ako je Gibsova slobodna energija te reakcije negativna, odnosno ako je energetski sadržaj produkata reakcije na nižem nivou od energetskog sadržaja reaktanata. Na osnovu rezultata dobijenih u ovom istraživanju može se zaključiti da i pored dovedene mehaničke energije u sistem, prisutna slobodna energija nije bila dovoljna da se odigra reakcija između MgO i TiO2 i dobije magnezijum titanat kao produkt. Mehanička energija koja je predata reakcionom sistemu u mehano-hemijskom aktivatoru dovela je do rušenja kristalne strukture i amorfizacije reaktanata, što se vidi na prikazanim diftaktogramima, ali nije bila dovoljna za sintezu magnezijum titanata prema jednačini (1), pa bi u tom cilju bilo neophodno koristiti energetski jači uređaj koji bi polaznim komponentama predao veći sadržaj energije, čime bi se preskočila energetska barijera i omogućilo polaznim oksidima da uđu u hemijsku reakciju tokom mehaničke aktivacije.", publisher = "Belgrade : Association of the Chemical Engineers of Serbia", journal = "Hemijska industrija", title = "Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system, Ispitivanje uticaja mehaničke aktivacije smeše MgO-TiO2 na sintezu magnezijum-titanata", volume = "75", number = "4", pages = "213-225", doi = "10.2298/HEMIND210402022D" }
Đorđević, N. G., Vlahović, M., Martinović, S., Mihajlović, S., Vušović, N. M.,& Sokić, M. D.. (2021). Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system. in Hemijska industrija Belgrade : Association of the Chemical Engineers of Serbia., 75(4), 213-225. https://doi.org/10.2298/HEMIND210402022D
Đorđević NG, Vlahović M, Martinović S, Mihajlović S, Vušović NM, Sokić MD. Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system. in Hemijska industrija. 2021;75(4):213-225. doi:10.2298/HEMIND210402022D .
Đorđević, Nataša G., Vlahović, Milica, Martinović, Sanja, Mihajlović, Slavica, Vušović, Nenad M., Sokić, Miroslav D., "Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system" in Hemijska industrija, 75, no. 4 (2021):213-225, https://doi.org/10.2298/HEMIND210402022D . .