Application of desulfurization gypsum as activator for modified magnesium slag-fly ash cemented paste backfill material

Ruan, Shishan; Zhu, Mengbo; Shao, Chengcheng; Xie, Lei; Hou, Dongzhuang

doi:10.1016/j.scitotenv.2023.161631

Cited by 30 publications

(3 citation statements)

References 71 publications

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“…), and the reactive ions were aggregated by diffusion through the concentration difference to undergo a secondary hydration reaction, as shown in Equations ( 8)- (11). That is, Ca(OH) 2 reacts with active silica-alumina substances to produce hydration products such as C-S-H gels, ettringite, and sodium rhodochrosite zeolites [57,64]. The generated hydration products fill in the pores, increasing the degree of densification and ensuring the growing strength of the filling body.…”

Section: Final Intensitymentioning

confidence: 99%

Resource Utilization Potential of Red Mud: A Study on the Micro-Mechanism of the Synergistic Effect of Multiple Solid Waste Filling Materials

Zhang,

Yan,

Bai

et al. 2023

Sustainability

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Red mud (RM) is a common industrial byproduct that is characterized by high alkalinity, high pollution, and difficult utilization. In this paper, gangue (CG), flue gas desulfurization gypsum (FGD), and silicate cement (PC) were used to assist red mud in the preparation of red mud-based composite filler material (RMC), aiming at the large-scale resource utilization of RM. The effects of the mass ratio of RM/CG, the mass ratio of FGD/(RM + CG), and the water–solid ratio (WCR) on the multi-angle properties of RMC were investigated and the optimal ratios were determined. The results showed that the RM/CG was 7:1, FGD/(RM + CG) was 4%, and WCR was 0.51 (RMC8), and the system could increase the RM content to 70%. The microstructural analysis of RMC using a specific surface area and porosity analyzer (BET), X-ray diffractometer (XRD), and scanning electron microscope (SEM) showed that its hydration products could remodel the pore structure, encapsulate and cement the coarse and fine particles into a dense matrix, and play a certain alkali reduction role, which revealed the microscopic synergistic mechanism between multiple solid wastes. The study shows that the comprehensive disposal of RM reduces the pollution released into the environment and provides new ideas for the green development of mines.

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Section: Final Intensitymentioning

confidence: 99%

Resource Utilization Potential of Red Mud: A Study on the Micro-Mechanism of the Synergistic Effect of Multiple Solid Waste Filling Materials

Zhang,

Yan,

Bai

et al. 2023

Sustainability

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“…Currently, the filling materials employed in coal mine goaf filling mainly include gangue, paste, and high‐moisture materials. However, they suffer from disadvantages such as insufficient supply of gangue aggregates, low filling rates, and high investment costs (Cai et al., 2019; Li et al., 2023; Ruan et al., 2023; Shi et al., 2019; Zhao et al., 2020). Application of waste straw as filling material in coal mine goafs not only helps mitigate surface subsidence but also promotes residual coal conversion into methane.…”

Section: Introductionmentioning

confidence: 99%

Field conditions for the synergistic increase of biomethane in the goaf of coal mines filled with corn straw

Li,

Guo,

Zhang

et al. 2024

GCB Bioenergy

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Synergistic fermentation of coal and corn straw is an effective tool to increase biomethane production. However, a large gap exists between the biomethane production conditions of corn straw filling coal mine goafs and laboratory experiments. In order to determine the effect of the field environment on synergistic biomethane production, biomethane production experiments with coal and corn straw were carried out under different conditions to find the key factors restricting the potential of biomethane production. The obtained results showed that various bacterial sources had significant influences on the biomethane production of coal and corn straw, and domesticated bacterial sources provided fermentation systems with more efficient biomethane production capacities than mine water sources. Biomethane production of coal and corn straw was relatively high under mixed conditions, but it was also promoted under unmixed conditions. Different inorganic minerals had different effects on synergistic biomethane production, which varied. For example, calcite, montmorillonite, and kaolin are common minerals in coal‐bearing strata that significantly enhance synergistic biomethane production of coal and corn straw. However, pyrite was found to significantly inhibit the synergistic biomethane production effect of coal and corn straw. Highly metamorphosed anthracite coal also presented biomethane production potential when stimulated by corn straw as a carbon source. The obtained results revealed the influences of different field conditions on the biomethane production of coal and corn straw and provided a reference for the field application of corn straw filling in coal mine goafs.

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“…Rock is the main supporting material in underground engineering [1][2][3], and its damage degree evolves with time under the action of external factors such as force [3][4][5][6] temperature [7][8][9], and water [10][11][12]. Real-time detection and characterization of rock damage location and damage level is the key to preventing underground disasters [13][14][15]. The commonly used non-destructive characterization methods for rock damage include image method and acoustic method [16,17].…”

Section: Introductionmentioning

confidence: 99%

An Improved Rock Damage Characterization Method Based on the Shortest Travel Time Optimization with Active Acoustic Testing

Zhou,

Liu,

Zhao

et al. 2024

Mathematics

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Real-time evaluation of the damage location and level of rock mass is essential for preventing underground engineering disasters. However, the heterogeneity of rock mass, which results from the presence of layered rock media, faults, and pores, makes it difficult to characterize the damage evolution accurately in real time. To address this issue, an improved method for rock damage characterization is proposed. This method optimizes the solution of the global shortest acoustic wave propagation path in the medium and verifies it with layered and defective media models. Based on this, the relationship between the inversion results of the wave velocity field and the distribution of rock damage is established, thereby achieving quantitative characterization of rock damage distribution and degree. Thus, the improved method is more suitable for heterogeneous rock media. Finally, the proposed method was used to characterize the damage distribution evolution process of rock media during uniaxial compression experiments. The obtained results were compared and analyzed with digital speckle patterns, and the influencing factors during the use of the proposed method are discussed.

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Application of desulfurization gypsum as activator for modified magnesium slag-fly ash cemented paste backfill material

Cited by 30 publications

References 71 publications

Resource Utilization Potential of Red Mud: A Study on the Micro-Mechanism of the Synergistic Effect of Multiple Solid Waste Filling Materials

Resource Utilization Potential of Red Mud: A Study on the Micro-Mechanism of the Synergistic Effect of Multiple Solid Waste Filling Materials

Field conditions for the synergistic increase of biomethane in the goaf of coal mines filled with corn straw

An Improved Rock Damage Characterization Method Based on the Shortest Travel Time Optimization with Active Acoustic Testing

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