钢渣优化石粉源钙基CO2吸附剂循环稳定性研究

doi:10.19964/j.issn.1006-4990.2024-0606

Abstract

Abstract:

Poor cycling stability is the main bottleneck restricting the development and application of calcium-based CO₂adsorbent.The precursors were prepared from stone powder and steel slag，and the optimum conditions for preparing adsorbent were determined by response surface method.The influence and mechanism of steel slag on the cyclic stability of the adsorbent were studied by calcium cycle testing and SEM，XRD，BET detection.The results showed that the optimum conditions for preparation of the adsorbent were calcination temperature of 860 ℃，calcination time of 95 min，in an air atmosphere，mass ratio of stone powder，steel slag and cement 90:7:3，and at this time the effective decomposition value of the adsorbent was 94.06%.After 35 calcium cycles（GX₃₅），the CO₂ adsorption capacity and carbonation conversion rate of the adsorbent with steel slag were 0.426 1 g/g and 78.60%，respectively，which were better than the CO₂ capture performance of the adsorbent without steel slag after 20 calcium cycles（SX₂₀）.GX₃₅ contained a relatively large number of pores with diameters ranging from 1 nm to 3 nm and it had a loose sponge-like structure overall，while SX₂₀contained few pores with diameters below 5 nm and it had a tight structure.The adsorbent with steel slag showed a smaller change in crystal growth and pore structure during the calcium cycle compared to the adsorbent without steel slag.Steel slag could play the role of accelerate decomposition，block separation，disperse limiting，skeleton support and nucleation，inhibited crystal aggregation and particle agglomeration，and reduced pore structure collapse and plugging amplitude，and enhanced the anti-sintering ability and cycle stability of the adsorbent.

Key words: calcium-based CO₂ absorbent, cycle stability, steel slag, stone powder, sintering

CLC Number:

O647.33

PENG Xinghua, LI Guodong, TAN Jing, YOU Dahai, ZHANG Chaohong, ZHANG Jin, ZHANG Li. Study on steel slag optimized cycle stability of calcium-based CO₂ adsorbent from stone powder[J]. Inorganic Chemicals Industry, 2025, 57(10): 111-118.

Figures/Tables 12

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样品	晶粒大小/nm	样品	晶粒大小/nm
GX	41.04	GX₃₅	49.36
SX	40.81	SX₂₀	52.28

样品	比表面积/ （m².g^-1）	微孔比表面积/（m².g^-1）	微量率/ %	孔容/ （cm³.g^-1）	平均孔径/nm
GX	3.57	0.92	25.79	0.019 2	23.24
SX	3.66	1.65	45.03	0.009 0	10.41
GX₃₅	0.57	0.26	45.62	0.001 8	12.52
SX₂₀	0.53	0.11	20.18	0.001 7	14.29

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on steel slag optimized cycle stability of calcium-based CO₂ adsorbent from stone powder

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Study on steel slag optimized cycle stability of calcium-based CO2 adsorbent from stone powder