LAPSE:2024.0827
Published Article
LAPSE:2024.0827
Activation of Low-Quality Coal Gangue Using Suspension Calcination for the Preparation of High-Performance Low-Carbon Cementitious Materials: A Pilot Study
June 7, 2024
Abstract
Although the calcination-based activation of coal gangue is important for its valorization in the form of cementitious materials, the related works mainly focus on high-quality coal gangue, neglecting its low-quality counterpart. To bridge this gap, we herein conducted the pilot-scale suspension calcination of low-quality coal gangue; explored the effects of calcination temperature, particle size, and O2 content on the phase composition of the calcined product, kaolinite decomposition, decarbonization, and silica/alumina dissolution; and evaluated calcination-product-based cementitious materials. Under optimal conditions (temperature = 875−900 °C; particle size = 39.71−46.84 μm; and O2 content = 12−14%), the carbon content of the calcined product equaled 1.24−1.87 wt%, and the dissolution rates of activated alumina and silica were 77.6−79.5% and 49.4−51.1%, respectively. The 28 d compressive strength (50.8−55.7 MPa) and true activity index (98.8−108.4%) of the cementitious material prepared at a calcination product dosage of 30−38 wt% met the standard of 42.5 grade cement. This study demonstrated the suitability of suspension calcination for the preparation of high-performance low-carbon cementitious materials from low-quality coal gangue, thus providing a basis for further industrialization and technological development.
Although the calcination-based activation of coal gangue is important for its valorization in the form of cementitious materials, the related works mainly focus on high-quality coal gangue, neglecting its low-quality counterpart. To bridge this gap, we herein conducted the pilot-scale suspension calcination of low-quality coal gangue; explored the effects of calcination temperature, particle size, and O2 content on the phase composition of the calcined product, kaolinite decomposition, decarbonization, and silica/alumina dissolution; and evaluated calcination-product-based cementitious materials. Under optimal conditions (temperature = 875−900 °C; particle size = 39.71−46.84 μm; and O2 content = 12−14%), the carbon content of the calcined product equaled 1.24−1.87 wt%, and the dissolution rates of activated alumina and silica were 77.6−79.5% and 49.4−51.1%, respectively. The 28 d compressive strength (50.8−55.7 MPa) and true activity index (98.8−108.4%) of the cementitious material prepared at a calcination product dosage of 30−38 wt% met the standard of 42.5 grade cement. This study demonstrated the suitability of suspension calcination for the preparation of high-performance low-carbon cementitious materials from low-quality coal gangue, thus providing a basis for further industrialization and technological development.
Record ID
Keywords
cementitious material, decarbonization, low-quality coal gangue, process optimization, suspension calcination
Subject
Suggested Citation
Zhang H, Jiu S, Gao Q, Zhao S, Chen Y, Cheng F, Han D, Shi R, Yuan K, Li J, Li Y, Wang Z, Zhao B. Activation of Low-Quality Coal Gangue Using Suspension Calcination for the Preparation of High-Performance Low-Carbon Cementitious Materials: A Pilot Study. (2024). LAPSE:2024.0827
Author Affiliations
Zhang H: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; Anhui Conch Group Co., Ltd., Wuhu 241004, China
Jiu S: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China [ORCID]
Gao Q: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Zhao S: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Chen Y: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China [ORCID]
Cheng F: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Han D: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Shi R: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Yuan K: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Li J: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Li Y: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Wang Z: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Zhao B: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Jiu S: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China [ORCID]
Gao Q: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Zhao S: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Chen Y: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China [ORCID]
Cheng F: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Han D: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Shi R: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Yuan K: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Li J: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Li Y: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Wang Z: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Zhao B: School of Materials and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Journal Name
Processes
Volume
12
Issue
3
First Page
550
Year
2024
Publication Date
2024-03-11
ISSN
2227-9717
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PII: pr12030550, Publication Type: Journal Article
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LAPSE:2024.0827
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https://doi.org/10.3390/pr12030550
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Jun 7, 2024
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