Experimental Study on the Mechanical Properties and Microstructural Mechanisms of Coal Gangue-Based Cementitious Materials Synergistically Activated by Desulfurization Gypsum and Lime DOI Open Access
Luyao Wang, Qingping Wang, Jingyi Cai

и другие.

Polymers, Год журнала: 2025, Номер 17(7), С. 932 - 932

Опубликована: Март 29, 2025

Coal gangue and flue gas desulfurization gypsum (DG) are industrial by-products whose utilization is critical for sustainable development. This study explores the synergistic activation of coal using DG lime to develop eco-friendly cementitious materials. Three systems-CF (coal gangue-DG), CL gangue-lime), CFL gangue-DG-lime)-were designed investigate effects on reactivity. Unconfined compressive strength tests identified optimal dosages lime, while XRD, SEM, TGA-DTG, NMR analyses were employed characterize hydration products microstructure. The results demonstrated that calcium ions from both facilitated formation C-(A)-S-H gel, enhancing However, excessive led undesirable volume expansion due ettringite overproduction, compromising material stability. Excess forms weak Ca(OH)2 binding phases causes cracking heat, reducing durability. Thus, dosage in CF system 70%, 6%. In system, 70% 4% achieve best performance. combined use not only improved reactivity but also achieved an balance between enhancement long-term stability, offering a promising approach construction

Язык: Английский

Coal and Coal By-Products as Unconventional Lithium Sources: A Review of Occurrence Modes and Hydrometallurgical Strategies for Metal Recovery DOI Open Access
Ewa Rudnik

Minerals, Год журнала: 2024, Номер 14(8), С. 849 - 849

Опубликована: Авг. 22, 2024

Lithium, a critical material for the global development of green energy sources, is anomalously enriched in some coal deposits and by-products to levels that may be considered economically viable. Recovering lithium from coal, particularly gangue or ashes, offers promising alternative extracting this element. This process could potentially lead economic gains positive environmental impacts by more efficiently utilizing coal-based waste materials. review focuses on concentrations by-products, modes occurrence, methods used identify lithium-enriched phases, currently available hydrometallurgical recovery methods, correlated with pretreatment procedures enable release inert aluminosilicate minerals. Leaching raw appears inefficient, whereas fly ash are feasible due their simpler composition higher contents. Lithium extraction can achieve rates over 90%, but low high impurity leachates require advanced selective separation techniques. Bottom has not yet been evaluated recovery, despite its content compared feed coal.

Язык: Английский

Процитировано

3

Study on recovering the scattered metals from coal gangue by low-temperature activation and two-stage selective leaching DOI
P. S. Wei, Chi Wang, Keji Wan

и другие.

Separation and Purification Technology, Год журнала: 2024, Номер unknown, С. 130214 - 130214

Опубликована: Окт. 1, 2024

Язык: Английский

Процитировано

3

Review on Gallium in Coal and Coal Waste Materials: Exploring Strategies for Hydrometallurgical Metal Recovery DOI Creative Commons
Ewa Rudnik

Molecules, Год журнала: 2024, Номер 29(24), С. 5919 - 5919

Опубликована: Дек. 15, 2024

Gallium, a critical and strategic material for advanced technologies, is anomalously enriched in certain coal deposits by-products. Recovering gallium from solid residues generated during production utilization can yield economic benefits positive environmental gains through more efficient waste processing. This systematic literature review focuses on concentrations its combustion or gasification by-products, modes of occurrence, gallium-hosting phases, hydrometallurgical recovery methods, including pretreatment procedures that facilitate metal release inert aluminosilicate minerals. Coal gangue, especially fly ashes gasification, are particularly promising due to their higher content rates, which exceed 90% under optimal conditions. However, the low high levels impurities leachates require innovative selective separation techniques, primarily involving ion exchange adsorption. The scientific revealed coal, bottom ash, coarse slag have not yet been evaluated recovery, even though wastes contain than original material.

Язык: Английский

Процитировано

3

Mechanism study on the generation of oxygen vacancies by ball milling surface modification of siliceous minerals in coal gangue to enhance reactivity DOI

Huixin Zhou,

Dongwei Ma, Lingwen Dai

и другие.

Applied Surface Science, Год журнала: 2024, Номер 686, С. 162189 - 162189

Опубликована: Дек. 24, 2024

Язык: Английский

Процитировано

3

Coal-bearing kaolinite-based plant growth-promoting fertilizer with integrated slow-release and water-retention properties DOI
Yi Zhou, Guocheng Lv,

Qinwen Zheng

и другие.

The Science of The Total Environment, Год журнала: 2025, Номер 959, С. 178235 - 178235

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0

Convert Iron Tailings Waste into a Novel Mg-Fe-Al Hybrid Magnetic Coagulant for Enhanced Pretreatment of Swine Wastewater DOI
Linlin Hao, Jingshuang Yan, Jia–Wen Guo

и другие.

Journal of environmental chemical engineering, Год журнала: 2025, Номер unknown, С. 115546 - 115546

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0

An overview of the coal circularity in Brazil: A new sustainable approach based on sampling method, characterization, and waste valorization DOI

M.N.S. Faraco,

Lisandro Simão, Juliana Acordi

и другие.

Resources Policy, Год журнала: 2025, Номер 102, С. 105496 - 105496

Опубликована: Фев. 3, 2025

Язык: Английский

Процитировано

0

Eco-friendly utilization and microbiological characteristics of coal gangue substrate via functional microbial fermentation DOI
Jinhui Shi, Xiaoyu Zhang,

Mengting Lu

и другие.

Environmental Research, Год журнала: 2025, Номер 271, С. 121035 - 121035

Опубликована: Фев. 4, 2025

Язык: Английский

Процитировано

0

Outer space migration, soil first: Preparation of soil like matrix by co-pyrolysis of coal gangue and biomass DOI Creative Commons
Qiang Niu,

Fenghui Wu,

Guojun Chen

и другие.

Industrial Crops and Products, Год журнала: 2025, Номер 226, С. 120733 - 120733

Опубликована: Фев. 18, 2025

Язык: Английский

Процитировано

0

Research on innovative PVC-steel wire mesh composite confined spontaneous combustion coal gangue concrete: Experiment and finite element analysis DOI
Hongbo Guan, Keling Wang,

Benxin Hao

и другие.

Structures, Год журнала: 2025, Номер 74, С. 108603 - 108603

Опубликована: Март 8, 2025

Язык: Английский

Процитировано

0