Preparation of high-strength ceramsites from coal gangue with high carbon and sulfur content

LI Xiaobing; MA Wenzhuo; YANG Xiaofei; LIANG Jie; PAN Jian; ZHU Deqing; YANG Xiaoman; LIU Tianwen; LAN Jinhui; LIU Jiajun

doi:10.13205/j.hjgc.202511021

Volume 43 Issue 11

Nov. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(11): 187-195

LI Xiaobing, MA Wenzhuo, YANG Xiaofei, LIANG Jie, PAN Jian, ZHU Deqing, YANG Xiaoman, LIU Tianwen, LAN Jinhui, LIU Jiajun. Preparation of high-strength ceramsites from coal gangue with high carbon and sulfur content[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 187-195. doi: 10.13205/j.hjgc.202511021

Citation:

LI Xiaobing, MA Wenzhuo, YANG Xiaofei, LIANG Jie, PAN Jian, ZHU Deqing, YANG Xiaoman, LIU Tianwen, LAN Jinhui, LIU Jiajun. Preparation of high-strength ceramsites from coal gangue with high carbon and sulfur content[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 187-195. doi: 10.13205/j.hjgc.202511021

Citation:

LI Xiaobing, MA Wenzhuo, YANG Xiaofei, LIANG Jie, PAN Jian, ZHU Deqing, YANG Xiaoman, LIU Tianwen, LAN Jinhui, LIU Jiajun. Preparation of high-strength ceramsites from coal gangue with high carbon and sulfur content[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 187-195. doi: 10.13205/j.hjgc.202511021

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Preparation of high-strength ceramsites from coal gangue with high carbon and sulfur content

doi: 10.13205/j.hjgc.202511021

1. Huadian Coal Industry Group Co., Ltd., Beijing 100035, China;
2. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
3. Low carbon and hydrogen Metallurgy Research Center, Central South University, Changsha 410083, China;
4. Huadian Coal Industry Group Intelligence Technology Co., Ltd., Beijing 102400, China;
5. Beijing Zhonghonglian Engineering Technology Co., Ltd., Beijing 100080, China

Received Date: 2025-01-08
Accepted Date: 2025-03-15
Rev Recd Date: 2025-02-24

Available Online: 2026-01-09

Abstract

Abstract

Coal gangue is the largest solid waste in China. A large amount of untreated coal gangue will bring about many environmental problems. So it is urgent to deal with coal gangue in bulk and at high value. In this study， high-carbon and high-sulfur coal gangue was used as raw material to decarbonize and desulfurize， and raw coal gangue and two kinds of decarbonized coal gangues were used to prepare ceramsite， namely. By adjusting the raw material ratio， preparation parameters of green pellets， and firing parameters of ceramsite， the preparation process and performance characteristics of high-strength ceramsite were systematically studied. The research showed that the reverse flotation decarbonized coal gangue was more suitable for preparing ceramsite than raw coal gangue and self-heating decarbonized coal gangue. The optimal pelleting parameters were as follows： pelleting time of 8 minutes， green moisture of 14.0%， and the proportion of raw material -0.074 mm particles of 70%. Under this condition， the falling strength， compressive strength， and bursting temperature of green pellets were more than 20 times/0.5 m， 20 N/pellet， 335 ℃， and the compressive strength of dry pellets was 68 N/pellet. The high-strength ceramsites were obtained by roasting at 1125 ℃ for 25 min. The bulk density， apparent density， water absorption， cylinder compressive strength， and cold compressive strength were 884 kg/m³， 1667 kg/m³， 8.24%， 7.49 MPa， and 2541 N/pellet， respectively， meet the requirements of 900 grade high-strength ceramsites. The research provides theoretical support and a practical basis for the resource utilization of high-sulfur and high-carbon coal gangue， which is helpful in promoting the high-value utilization of solid waste.
- coal gangue,
- high strength ceramsite,
- decarbonization and desulphurization,
- reverse flotation,
- self-heating decarbonization

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References(31)

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