干旱区生态环境知识资源中心(Arid): Coal fly ash resource utilization: Effects of inorganic minerals amendments on CFA-originated opal/sand aggregates formation

Arid

DOI	10.1007/s11771-024-5609-4
	Coal fly ash resource utilization: Effects of inorganic minerals amendments on CFA-originated opal/sand aggregates formation
	Li, Wei-lun; Wang, Yi-lin; Zhu, Feng; Zhou, Qiu-sheng; Liu, Gui-hua; Peng, Zhi-hong; Qi, Tian-gui; Shen, Lei-ting; Li, Xiao-bin
通讯作者	Wang, YL ; Zhu, F
来源期刊	JOURNAL OF CENTRAL SOUTH UNIVERSITY
ISSN	2095-2899
EISSN	2227-5223
出版年	2024
卷号	31 期号:4 页码:1248-1264
英文摘要	Opal (amorphous silica, SiO2 center dot nH(2)O), a solid waste byproduct of the alkaline extracting alumina from coal fly ash, exhibits strong adsorption properties and is a secondary/clay mineral in the soil. Combining opal with sand to construct opal/sand aggregates for desertification soil remediation holds the potential for large-scale ecological disposal. Unfortunately, the aggregate structure still gaps from natural soil aggregates resulting from inorganic mineral deficiencies. Herein, the effects of five inorganic mineral amendments, limestone (CaCO3), desulphurization gypsum (CaSO4 center dot 2H(2)O), hematite (Fe2O3), tricalcium phosphate (Ca-3(PO4)(2)) and gibbsites (Al(OH)(3)), on aggregate formation, stabilization, and pore characteristics without the organic matters were investigated in short-term cultivation experiments. Meanwhile, associated adsorption mechanisms were elucidated. Results indicated only gypsum effectively reduced the aggregate's pH, most enhanced water-holding capacity, albeit increased electrical conductivity. All amendments facilitated aggregate formation and mechanical-stability, with gypsum, CaCO3, and Fe2O3 improving water stability. Various analysis techniques, including XRD, SEM, nano-CT, FT-IR, and XPS, provided insights into the physisorption and chemisorption of minerals onto sand/opal, generating interfaces conducive to aggregation. Compared to CK (control check, without amendment addition), amended macroaggregates demonstrated increased porosity, reduced pore quantity and mean pore diameter (MPD), denser pore structure, improved interpore connectivity, and more complex pore networks, dominated by <80 m diameters and boundary pores. Notably, desulphurization gypsum elicited the most significant variations, increasing MPD of microaggregates and 2-5 nm mesopores, and decreasing total pore volume and 0-2 nm micropores, while Ca-3(PO4)(2) and Al(OH)(3) improved >15 nm mesopores. Overall, inorganic minerals, the skeleton of soil, effectively upgraded opal/sand aggregates' physical structure and accelerated aggregate formation quickly. Therein, desulphurization gypsum optimized macroaggregate formation and stability. Desulphurization gypsumamended aggregates serve as soil-like substrates to accelerate the ecological reconstruction of desertification areas.
英文关键词	inorganic minerals amendments opal/sand aggregates desulphurization gypsum aggregate stability pore characteristics desertification soil remediation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001249424300026
WOS关键词	SOIL ORGANIC-MATTER ; BAUXITE RESIDUE ; FERRIC-OXIDE ; DESERTIFICATION ; CARBONATES ; STABILITY ; SILICA
WOS类目	Metallurgy & Metallurgical Engineering
WOS研究方向	Metallurgy & Metallurgical Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404400
推荐引用方式 GB/T 7714	Li, Wei-lun,Wang, Yi-lin,Zhu, Feng,et al. Coal fly ash resource utilization: Effects of inorganic minerals amendments on CFA-originated opal/sand aggregates formation[J],2024,31(4):1248-1264.
APA	Li, Wei-lun.,Wang, Yi-lin.,Zhu, Feng.,Zhou, Qiu-sheng.,Liu, Gui-hua.,...&Li, Xiao-bin.(2024).Coal fly ash resource utilization: Effects of inorganic minerals amendments on CFA-originated opal/sand aggregates formation.JOURNAL OF CENTRAL SOUTH UNIVERSITY,31(4),1248-1264.
MLA	Li, Wei-lun,et al."Coal fly ash resource utilization: Effects of inorganic minerals amendments on CFA-originated opal/sand aggregates formation".JOURNAL OF CENTRAL SOUTH UNIVERSITY 31.4(2024):1248-1264.