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Kinetics and mechanism of thermal decomposition of lead carbonate

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Abstract

Results are given on the kinetics and mechanism of the processes in the thermal decomposition of lead carbonate with the application of TG and DTA experimental investigation methods.

The following mechanism was established: 3 PbCO3=2 PbO.PbCO3+2 CO2 (1) 2 PbO.PbCO3=3 PbO+CO2 (2) PbO — melting (3)

The following activation energy values were determined with TG methods for processes (1) and (2): 118.2 and 235.2 kJ/mole, respectively; and with DTA methods for processes (1), (2) and (3): 113.9, 246.6 and 294.9 kJ/mole, respectively.

Résumé

La cinétique et le mécanisme des réactions qui se déroulent lors de la décomposition thermique du carbonate de plomb ont été étudiés par TG et ATD. Les mécanismes suivants ont été établis: 3 PbCO3=2 PbO.PbCO3+2 CO2 (1) 2 PbO.PbCO3=3 PbO + CO2 (2) PbO — fusion (3)

Pour les réactions (1) et (2), les valeurs de 118.2 et 235.2 kJ · mol−1 ont été trouvées à partir des résultats TG et pour les réactions (1), (2) et (3) l'ATD a fourni respectivement 113.9, 246.6 et 294.9 kJ · mol−1.

Zusammenfassung

Die an Hand der TG- und DTA-Untersuchungen erhaltenen Ergebnisse über Kinetik und Mechanismus der bei der thermischen Zersetzung von Bleicarbonat auftretenden VorgÄnge werden beschrieben.

Die folgenden Mechanismen des Vorganges wurden festgestellt: 3 PbCO3=2 PbO.PbCO3 + 2 CO2 (1) 2 PbO.PbCO3=3 PbO + CO2 (2) PbO — Schmelzen (3)

Die folgenden Werte der Aktivierungsenergie wurden durch TG-Versuche für die VorgÄnge (1) und (2) bestimmt: 118.2, bzw. 235.2 kJ/Mol, und durch DTA-Messungen für die VorgÄnge (1), (2) und (3): 113.9, 246.6, bzw. 294.9 kJ/Mol.

РЕжУМЕ

пРЕДстАВлЕНы РЕжУль тАты ИсслЕДОВАНИь кИНЕтИкИ И МЕхАНИжМА пРОцЕссОВ, пРОИсхОДьЩИх пРИ тЕР МИЧЕскОМ РАжлОжЕНИИ кАРБОНАтА сВИНцА с ИспОльжОВАН ИЕМ тг ИДтА. УстАНОВлЕН слЕДУУЩИ И МЕхАНИжМ ЁтОгО пРОц ЕссА: 3 РьсО3=2 PbO.PbCO3+2 сО2 (1) 2 PbO.PbCO3=3 РьО+сO2 (2) РьО — плАВлЕНИЕ (3) с пОМОЩьУ тг МЕтОДОВ Б ылИ ОпРЕДЕлЕНы жНАЧЕ НИь ЁНЕРгИИ АктИВАцИИ Дль пРОцЕс сОВ (1) И (2), кОтОРыЕ сООтВЕтст ВЕННО БылИ РАВНы 118.2 И 235.2 к Дж/МОль. Дль пРОцЕссОВ (1), (2) И (3) МЕтОДАМИ ДтА БылИ О пРЕДЕлЕНы слЕДУУЩИЕ жНАЧЕНИь ЁНЕРгИИ АктИВАцИИ: 113.9; 246.6 И 294.9 кДж/МОль.

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  1. Faculty of Mining and Metallurgy in Bor, University of Beograd, 19210, Bor, Yugoslavia

    Ž. D. Živković

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  1. Ž. D. Živković
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Živković, Ž.D. Kinetics and mechanism of thermal decomposition of lead carbonate. Journal of Thermal Analysis 16, 3–11 (1979). https://doi.org/10.1007/BF01909627

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