Investigating the synergistic effects of magnesia-coal slag based solid waste cementitious materials and its basic characteristics as a backfill material

Yang, Piaoping; Suo, Yonglu; Qu, Huisheng; Xie, Geng; Zhang, Caixin; Deng, Shunchun; Lv, Yin

doi:10.1016/j.scitotenv.2023.163209

Cited by 57 publications

(3 citation statements)

References 59 publications

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“…CaO directly reacts with water to produce CH, creating an alkaline environment for subsequent reactions in the backfill system. Meanwhile, SiO 2 and Al 2 O 3 with higher reactivity interact with the CH generated in the filling system to form C-S-H, C-A-H, and C-A-S-H gels, and the reaction equations are given in Equations ( 5)-( 7) [54][55][56]. Generally, because these three gels are amorphous and grow together to form a multimineral complex gel structure, they cannot be effectively distinguished in the SEM images.…”

Section: Mechanism Analysismentioning

confidence: 99%

Lithium Slag and Solid Waste-Based Binders for Cemented Lithium Mica Fine Tailings Backfill

Li,

Huang,

et al. 2023

Materials

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To mitigate the adverse effects of fine-grained lithium mica tailings and other solid wastes generated from the extraction of lithium ore mining, as well as the limitations of traditional cement-based binders for lithium mica fine tailings, this study explores the feasibility of using a binder composed of ordinary Portland cement, lithium slag, fly ash, and desulfurization gypsum to stabilize lithium fine tailings into cemented lithium tailings backfill. Compared with traditional cementitious binders, an extensive array of experiments and analyses were conducted on binders formed by various material proportion combinations, employing uniaxial compressive strength tests, microstructural morphology, grayscale analyses, and flowability tests. The results show the following: (1) In this study, an LSB binder exhibiting superior mechanical properties compared to traditional cementitious binders was identified, with an optimal OPC:LS:FA:DG ratio of 2:1:1:1. (2) In the context of cemented lithium mica fine tailings, the LSB-CLTB material exhibits higher unconfined compressive strength and lower self-weight compared to OPC-CLTB materials. At a binder content of 10 wt%, the UCS values achieved by the LSB-CLTB material at curing periods of 7 days, 14 days, and 28 days are 0.97 MPa, 1.52 MPa, and 2.1 MPa, respectively, representing increases of 40.6%, 34.5%, and 44.8% over the compressive strength of OPC-based materials under the same conditions. (3) The LSB binder not only exhibits enhanced pozzolanic reactivity but also facilitates the infilling of detrimental pores through its inherent particle size and the formation of AFt and C-(A)-S-H gels via hydration reactions, thereby effectively improving the compressive strength performance of fine-grained tailings backfill.

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Section: Mechanism Analysismentioning

confidence: 99%

Lithium Slag and Solid Waste-Based Binders for Cemented Lithium Mica Fine Tailings Backfill

Li,

Huang,

et al. 2023

Materials

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“…Currently, there is a wide range of research being conducted on the disposal and use of CSWM. The predominant research and application fields of CG are in engineering Sustainability 2024, 16,1955 2 of 16 fillers [9,10]. These fillers are typically employed in engineering applications such as mine backfill, subgrade fill, and foundation pit backfill.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Properties and Planting Performance of Artificial Soil Developed from Multiple Coal-Based Solid Waste Materials

Shu,

Wang,

2024

Sustainability

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Using coal-based solid waste (CSWM) to develop artificial soil (AS) can solve the shortage of planting soil in mine ecological restoration and realize the resource utilization of solid waste, which is a very promising research direction. This study used three common CSWM, coal gangue (CG), fly ash (FA), and desulfurization gypsum (DG), to prepare AS. The physicochemical properties of AS, such as bulk density, specific gravity, porosity, field water capacity, available nutrient content, pH value and EC value, were studied. Simultaneously, Elymus dahuricus was utilized in pot experiments to explore the planting performance of AS. Results show that, as the CG content decreased, the specific gravity of AS decreased, and the porosity increased. Both field capacity and saturation capacity demonstrated a notable upward trend. The results of pot experiments showed that plant growth was best when the CG content in AS was 80% and the FA and DG content was 20%. In comparison to the control group consisting of pure CG, the plant biomass in the optimal experimental group exhibited a significant increase of 20.48%. This study verified the feasibility of making AS by combining various CSWM, and provides a new pathway for ecological restoration and resource utilization in mines.

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“…The results show that alkali-fired cement meets filling strength requirements better and has lower environmental load than other materials. Yang Pan et al [10] prepared three kinds of magnesia-cinderbased gel materials to explore the possibility of goaf filling through fluidity, leaching property and compressive strength. The research showed that the developed full solidwaste MCC can completely replace cement to produce filling materials, reducing the cost of filling.…”

Section: Introductionmentioning

confidence: 99%

Research on Sustainable Development of Mining Goaf Management Based on Economic Models

Pang,

Shi,

Liu

2023

Sustainability

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The sustainable development of mines has been the focus of attention in recent years. In China, there are a large number of untreated mined-out areas, and a series of disasters caused by the instability of the goaf will bring heavy blows to people’s safety and financial resources. Filling treatment will lead to increasing costs and decreasing profits, which will seriously reduce the motivation of mining enterprises and even lead to a moral hazard. Therefore, the analysis of the economic benefits of goaf control plays a vital role in the sustainable construction and long-term development of mines. This paper proposed the mined-out area treatment economic model. The proposed method employs the guiding philosophy of the newsboy model to create a mathematical economy model that provides the basis for a goaf management mode for mines. The following research results were obtained: (1) The economic model of the mined-out area backfilling treatment is constructed, which is classified as three different modes. (2) Combined with mathematical derivation and simulation, the influence of relevant variable parameters on each type of filling mode is discussed. (3) Various types of goaf filling treatment mode are compared with a non-filling scheme (benchmark mode), to provide theoretical support to help mining enterprises choose appropriate filling schemes. The results show that the economic model of mined-out area management provides the optimal mode for mined-out area filling, and the balance of tailings and ultra-high-water filling material procurement is realized, resulting in maximum profits. In this paper, we explain how the use of economic thinking has an important impact on the sustainable development of safety goaf management.

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Investigating the synergistic effects of magnesia-coal slag based solid waste cementitious materials and its basic characteristics as a backfill material

Cited by 57 publications

References 59 publications

Lithium Slag and Solid Waste-Based Binders for Cemented Lithium Mica Fine Tailings Backfill

Lithium Slag and Solid Waste-Based Binders for Cemented Lithium Mica Fine Tailings Backfill

Physicochemical Properties and Planting Performance of Artificial Soil Developed from Multiple Coal-Based Solid Waste Materials

Research on Sustainable Development of Mining Goaf Management Based on Economic Models

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