Carbon sequestration material development with coal-based solid waste based on in-situ crosslinked network structures
LI Jiafeng
YANG Jianwei
SUN Xiaodong
FENG Yanjun
JIANG Pengfei
ZHANG Zhen
LI Wenzhou
WANG Tao
WANG Zhengsheng
LI Ming
ZHANG Quntao
CHEN Huiyuan
Abstract：For coal mine strata control,comprehensive disposal of coal-based solid waste and carbon sequestration/reduction,a systematic approach was designed involving coal-based solid waste pretreatment,material production,and gas sequestration units.Coal gangue,fly ash,and other coal-based solid wastes were crushed and sieved.A three-dimensional(3D)in-situ crosslinked polymer network using a four-arm crosslinker(pentaerythritol glycidyl ether)to immobilize CO2 was developed,thereby establishing an in-situ crosslinking network-based carbon sequestration method.The influence of the in-situ crosslinked polymer network structure on the slurry properties,mechanical characteristics,hydration products,microstructure and carbon sequestration efficiency of solid waste-based carbon sequestration grouting/filling materials was investigated using various characterization techniques.The coupling mechanism of the in-situ crosslinked polymer network structure in these materials was elucidated.Experimental results demonstrate that the in-situ crosslinked network structure enhanced the CO2 immobilization capacity from 1.29 mg/g to 2.17 mg/g,achieving highly efficient carbon fixation.Additionally,the in-situ crosslinked network accelerated the hydration rate,promoted the hydration process,and significantly improved mechanical strength,with flexural strength increasing by 128.8%and compressive strength by 118.4%.Field tests further confirmed that the performance of the developed solid waste-based carbon sequestration grouting material in rock reinforcement,high-efficiency carbon sequestration and solid waste disposal.
Keywords：coal mine strata controldisposal of coal based solid wastefilling/grouting materialsCO2 sequestrationin-situ cross-linking network structure
Publication Date：2025-08-31
Online Publishing Date：2025-09-05(First online date of this platform, not the publication date of the document)
Pages：17( 136-152 )