抑制性气氛中菱镁矿分解特性与动力学研究

doi:10.19964/j.issn.1006-4990.2022-0696

Abstract

Abstract:

Decomposition reaction characteristic of magnesite in the inhibitory atmosphere containing product gases was investigated by thermogravimetric analyzer（TGA）.The kinetic parameters were calculated based on the Flynn-Wall-Ozawa and Coats-Redfern methods.It was shown that the decomposition of magnesite was seriously inhibited as CO₂concentration increasing.Both the initial decomposition temperature and apparent activation energy were increased logarithmically but the temperature corresponding to the maximum reaction rate was increased exponentially with increasing CO₂ concentration.The decomposition of magnesite in the atmosphere with different CO₂ concentrations was followed the nucleation and growth control model G（x）=-ln（1-x）.This study would provide basic theoretical data for magnesite calcination and resource utilization in actual industry.

Key words: thermogravimetry, magnesite, inhibitory atmosphere, reaction kinetics, decomposition

CLC Number:

TQ132.2

LI Xiyan, ZHANG Hong, LIU Xuejing, YANG Hao, XU Shuai, LI Jiaxin, XIE Jiaqi, XU Guangwen. Study on decomposition characteristic and kinetics of magnesite in inhibitory atmosphere[J]. Inorganic Chemicals Industry, 2023, 55(10): 50-55.

Figures/Tables 13

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气氛	G（x）	β→0	β=5 ℃/min		β=10 ℃/min		β=20 ℃/min
气氛	G（x）	E/ （kJ∙mol^-1）	E/ （kJ∙mol^-1）	R	E/ （kJ∙mol^-1）	R	E/ （kJ∙mol^-1）	R
30%CO₂	G（x）=-ln（1-x）	344	324	0.999	318	0.999	241	0.996
	G（x）=1-（1-x）^1/2	258	287	0.996	265	0.999	201	0.999
	G（x）=1-（1-x）^1/3	275	305	0.998	282	0.999	214	0.999
50%CO₂	G（x）=-ln（1-x）	361	403	0.999	326	0.998	289	0.999
	G（x）=1-（1-x）^1/2	301	273	0.998	241	0.999	231	0.995
	G（x）=1-（1-x）^1/3	320	290	0.999	256	0.999	245	0.997

气氛	E/（kJ∙mol^-1）	G（x）	ln A
无CO₂	196	G（x）=-ln（1-x）	15.6
10%CO₂	291	G（x）=-ln（1-x）	33.8
30%CO₂	371	G（x）=-ln（1-x）	37.6
50%CO₂	427	G（x）=-ln（1-x）	39.6
100%CO₂	537	G（x）=-ln（1-x）	43.5

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Study on decomposition characteristic and kinetics of magnesite in inhibitory atmosphere

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