Study on Thermal Decomposition Behavior and Kinetics of Industrial Waste Bischofite

doi:10.12068/j.issn.1005-3026.2025.20230290

Abstract

Abstract:

Thermogravimetric analysis was carried out at different heating rates to determine the pyrolysis behavior and kinetic parameters of bischofite. Based on the differential thermogravimetry （DTG） and thermogravimetric analysis （TGA） curves， the bischofite pyrolysis was divided into three main mass-loss processes， namely， stage Ⅱ （73.92~278.14 ℃）， stage Ⅲ （278.14~540.27 ℃） and stage Ⅳ （540.27~849.52 ℃）. The multi-stage reaction separation （K-K ） method was utilized to further divide the overlapping DTG curves. The pyrolysis products were analyzed by XRD and Fourier transform infrared （FTIR） spectroscopy， and the pyrolysis mechanism of bischofite was clarified that the dehydration is triggered by the breakage of the Mg—O—H bond， while the enhancement of the Mg—O bond prompts the hydrolysis reaction and hinders the dehydration. Finally， the activation energy of the sub-reaction was determined by Friedman’s method， and the pyrolysis kinetic model was constructed by combining the customized reaction function with the kinetic compensation effect.

Key words: bischofite, dehydration reaction, pyrolysis, kinetic parameters, thermogravimetric analysis

CLC Number:

TQ 132.2

Han-lu XU, Hui DONG, Liang ZHAO, Dao-kuan CHENG. Study on Thermal Decomposition Behavior and Kinetics of Industrial Waste Bischofite[J]. Journal of Northeastern University(Natural Science), 2025, 46(3): 52-59.

Figures/Tables 8

References 33

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Ⅱ-1						Ⅲ
β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α	β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α
5	104.00	142.24	124.14	0.045	0.31	5	357.42	488.81	404.66	0.0041	0.65
10	114.09	161.81	133.46	0.069	0.31	10	369.44	527.70	413.82	0.0074	0.64
15	121.45	173.05	145.89	0.093	0.31	15	387.04	540.27	430.56	0.0130	0.65
Ⅱ-2						Ⅳ-1
β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α	β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α
5	142.24	174.84	156.76	0.030	0.44	5	671.27	750.14	728.86	0.016	0.91
10	161.81	202.33	170.66	0.053	0.43	10	682.11	776.96	766.17	0.032	0.90
15	173.05	213.60	181.52	0.078	0.44	15	684.91	803.78	782.74	0.037	0.92
Ⅱ-3						Ⅳ-2
β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α	β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α
5	174.84	239.45	221.40	0.020	0.59	5	750.14	796.55	757.56	0.015	0.99
10	202.33	262.29	233.88	0.037	0.57	10	776.96	823.04	778.71	0.033	0.99
15	216.60	278.14	243.64	0.056	0.59	15	803.78	849.52	815.77	0.036	0.99

Ⅱ-1						Ⅲ
β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α	β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α
5	104.00	142.24	124.14	0.045	0.31	5	357.42	488.81	404.66	0.0041	0.65
10	114.09	161.81	133.46	0.069	0.31	10	369.44	527.70	413.82	0.0074	0.64
15	121.45	173.05	145.89	0.093	0.31	15	387.04	540.27	430.56	0.0130	0.65
Ⅱ-2						Ⅳ-1
β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α	β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α
5	142.24	174.84	156.76	0.030	0.44	5	671.27	750.14	728.86	0.016	0.91
10	161.81	202.33	170.66	0.053	0.43	10	682.11	776.96	766.17	0.032	0.90
15	173.05	213.60	181.52	0.078	0.44	15	684.91	803.78	782.74	0.037	0.92
Ⅱ-3						Ⅳ-2
β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α	β/ (K·min^-1)	t_i /℃	t_f /℃	t_max /℃	k/(%·min^-1)	α
5	174.84	239.45	221.40	0.020	0.59	5	750.14	796.55	757.56	0.015	0.99
10	202.33	262.29	233.88	0.037	0.57	10	776.96	823.04	778.71	0.033	0.99
15	216.60	278.14	243.64	0.056	0.59	15	803.78	849.52	815.77	0.036	0.99

阶段	a	b	m	n	q	R²
Ⅱ-1	-4.602	0.301 5	-0.468 2	0.318 4	-19.760 0	0.999 2
Ⅱ-2	-0.553	0.280 2	0.190 6	0.269 2	0.481 2	0.999 0
Ⅱ-3	-2.077	0.251 0	-0.029 6	0.581 7	0.405 3	0.980 1
Ⅲ	-4.777	0.159 2	-7.071 0	1.957 0	0.147 3	0.969 8
Ⅳ-1	-5.817	0.166 2	0.999 8	0.176 9	0.954 6	0.999 1
Ⅳ-2	1.169	0.097 08	-0.470 1	0.921 1	3.000 0	0.999 0

阶段	a	b	m	n	q	R²
Ⅱ-1	-4.602	0.301 5	-0.468 2	0.318 4	-19.760 0	0.999 2
Ⅱ-2	-0.553	0.280 2	0.190 6	0.269 2	0.481 2	0.999 0
Ⅱ-3	-2.077	0.251 0	-0.029 6	0.581 7	0.405 3	0.980 1
Ⅲ	-4.777	0.159 2	-7.071 0	1.957 0	0.147 3	0.969 8
Ⅳ-1	-5.817	0.166 2	0.999 8	0.176 9	0.954 6	0.999 1
Ⅳ-2	1.169	0.097 08	-0.470 1	0.921 1	3.000 0	0.999 0

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