Novel insights into the problem of enthalpy and entropy convergence in thermal decomposition of coal slag using the data from non-isothermal kinetic measurements
Само за регистроване кориснике
2024
Аутори
Janković, BojanJanković, Marija
Smičiklas, Ivana
Jović, Mihajlo
Vukanac, Ivana
Mraković, Ana
Manić, Nebojša
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
This study provides insight into benefits of thermo-chemical conversion of coal slag as recovery process into value-added products. This research involves kinetic analysis of process conducted through non-isothermal thermal analysis measurements, with additional raw material characterization. Kinetic results showed that decomposition proceeds through two consecutive reactions steps (first one, including anorthite P1‾ → I1‾ phase transition, and then production of incongruent melting product (ternary system: CaO⋅Al2O3⋅2SiO2 (CAS2), where viscosity of slag changes), and second one including dehydration and formation of meta-muscovite, and subsequently, thermal disruption of muscovite de-hydroxylated phase, which proceeds with breaking of octahedral Al–O bonds), and one single-step reaction (attributed to CO-reduction of hematite to magnetite). Thermodynamic results showed an existence of physically meaningful isokinetic temperature (Tiso), which corresponds to active vibrational frequenc...y of surroundings of SiO2 reaction site, manifested through Si‒O bond weakening by catalytic reaction of freed hydroxide ion (OH ). It was concluded that at temperature T = Tiso, the course of process loses its dependence on temperature and pressure, regulating changes between thermodynamic parameters, through enthalpy-entropy compensation (EEC) effect.
Кључне речи:
Alumina-silicate / Slag composition / Non-isothermal kinetics / Enthalpy-entropy compensation / Isokinetic temperatureИзвор:
Thermochimica Acta, 2024, 736, 179763-Финансирање / пројекти:
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200105 (Универзитет у Београду, Машински факултет) (RS-MESTD-inst-2020-200105)
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200017 (Универзитет у Београду, Институт за нуклеарне науке Винча, Београд-Винча) (RS-MESTD-inst-2020-200017)
Колекције
Институција/група
VinčaTY - JOUR AU - Janković, Bojan AU - Janković, Marija AU - Smičiklas, Ivana AU - Jović, Mihajlo AU - Vukanac, Ivana AU - Mraković, Ana AU - Manić, Nebojša PY - 2024 UR - https://vinar.vin.bg.ac.rs/handle/123456789/13237 AB - This study provides insight into benefits of thermo-chemical conversion of coal slag as recovery process into value-added products. This research involves kinetic analysis of process conducted through non-isothermal thermal analysis measurements, with additional raw material characterization. Kinetic results showed that decomposition proceeds through two consecutive reactions steps (first one, including anorthite P1‾ → I1‾ phase transition, and then production of incongruent melting product (ternary system: CaO⋅Al2O3⋅2SiO2 (CAS2), where viscosity of slag changes), and second one including dehydration and formation of meta-muscovite, and subsequently, thermal disruption of muscovite de-hydroxylated phase, which proceeds with breaking of octahedral Al–O bonds), and one single-step reaction (attributed to CO-reduction of hematite to magnetite). Thermodynamic results showed an existence of physically meaningful isokinetic temperature (Tiso), which corresponds to active vibrational frequency of surroundings of SiO2 reaction site, manifested through Si‒O bond weakening by catalytic reaction of freed hydroxide ion (OH ). It was concluded that at temperature T = Tiso, the course of process loses its dependence on temperature and pressure, regulating changes between thermodynamic parameters, through enthalpy-entropy compensation (EEC) effect. T2 - Thermochimica Acta T1 - Novel insights into the problem of enthalpy and entropy convergence in thermal decomposition of coal slag using the data from non-isothermal kinetic measurements VL - 736 SP - 179763 DO - 10.1016/j.tca.2024.179763 ER -
@article{ author = "Janković, Bojan and Janković, Marija and Smičiklas, Ivana and Jović, Mihajlo and Vukanac, Ivana and Mraković, Ana and Manić, Nebojša", year = "2024", abstract = "This study provides insight into benefits of thermo-chemical conversion of coal slag as recovery process into value-added products. This research involves kinetic analysis of process conducted through non-isothermal thermal analysis measurements, with additional raw material characterization. Kinetic results showed that decomposition proceeds through two consecutive reactions steps (first one, including anorthite P1‾ → I1‾ phase transition, and then production of incongruent melting product (ternary system: CaO⋅Al2O3⋅2SiO2 (CAS2), where viscosity of slag changes), and second one including dehydration and formation of meta-muscovite, and subsequently, thermal disruption of muscovite de-hydroxylated phase, which proceeds with breaking of octahedral Al–O bonds), and one single-step reaction (attributed to CO-reduction of hematite to magnetite). Thermodynamic results showed an existence of physically meaningful isokinetic temperature (Tiso), which corresponds to active vibrational frequency of surroundings of SiO2 reaction site, manifested through Si‒O bond weakening by catalytic reaction of freed hydroxide ion (OH ). It was concluded that at temperature T = Tiso, the course of process loses its dependence on temperature and pressure, regulating changes between thermodynamic parameters, through enthalpy-entropy compensation (EEC) effect.", journal = "Thermochimica Acta", title = "Novel insights into the problem of enthalpy and entropy convergence in thermal decomposition of coal slag using the data from non-isothermal kinetic measurements", volume = "736", pages = "179763", doi = "10.1016/j.tca.2024.179763" }
Janković, B., Janković, M., Smičiklas, I., Jović, M., Vukanac, I., Mraković, A.,& Manić, N.. (2024). Novel insights into the problem of enthalpy and entropy convergence in thermal decomposition of coal slag using the data from non-isothermal kinetic measurements. in Thermochimica Acta, 736, 179763. https://doi.org/10.1016/j.tca.2024.179763
Janković B, Janković M, Smičiklas I, Jović M, Vukanac I, Mraković A, Manić N. Novel insights into the problem of enthalpy and entropy convergence in thermal decomposition of coal slag using the data from non-isothermal kinetic measurements. in Thermochimica Acta. 2024;736:179763. doi:10.1016/j.tca.2024.179763 .
Janković, Bojan, Janković, Marija, Smičiklas, Ivana, Jović, Mihajlo, Vukanac, Ivana, Mraković, Ana, Manić, Nebojša, "Novel insights into the problem of enthalpy and entropy convergence in thermal decomposition of coal slag using the data from non-isothermal kinetic measurements" in Thermochimica Acta, 736 (2024):179763, https://doi.org/10.1016/j.tca.2024.179763 . .