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This article provides an overview of the development of electronic slurries. It summarizes the development and preparation processes of the various components of traditional gold conductor slurries, as well as the process flow for mixing each component to prepare the gold slurries. Then, it analyzes the problems in the development of the domestic gold slurry industry and makes a certain degree of prediction for the future development trend of gold conductor slurries based on the development of the entire industry.

To address the dual challenges of environmentally sustainable coal gangue disposal and the effective utilization of underground mined-out spaces, this study investigates the structural characteristics of goafs that govern the efficiency of gangue slurry filling. An integrated methodology combining theoretical analysis, physical simulation experiments, and field-scale industrial testing was employed to systematically examine the spatial architecture and void distribution within the goaf. The research elucidates the spatial evolution mechanism of overlying strata, which follows a sequential “arch–beam–shell” pattern, leading to the identification of the stable residual “shell” structure as the Slurry-Filled Receptive (SF-R) zone. The key stratum governing slurry migration is defined as the Slurry Movement Control (SM-C) stratum, for which a discriminant criterion is established based on mechanical stiffness, strength, and stratal control principles. The influence of the SM-C stratum on the formation of three distinct structural zones-namely, free accumulation, load-affected, and compacted zones-along both strike and dip directions is clarified. Furthermore, the void distribution within the goaf is quantitatively characterized, revealing that the bulking factor of caved rock decreases with increasing depth and height into the goaf, following a negative logarithmic function. The SF-R zone constitutes a quantifiable and exploitable space for slurry injection, with its structural configuration and porosity primarily regulated by the SM-C stratum. These findings were validated through an industrial application at Huangling No. 2 Coal Mine, where targeted filling was implemented in the overlapping region of the free accumulation and load-affected zones. This study establishes a robust theoretical framework and provides a practical methodology for the design and optimization of high-efficiency gangue slurry filling systems.

Nowadays, there is a growing concern about the environmental impacts of colored wastewater. Thus, the present work aims the synthesis, characterization and determination of photocatalytic activity of iron oxide (Fe 2 O 3 ) nanocatalyst, evaluating the effect of hybridization with titanium (TiNPs-Fe 2 O 3 ) and silver (AgNPs-Fe 2 O 3 ) nanoparticles, on the degradation of Rhodamine B dye (RhB). Nanocatalysts were characterized by XRD, SEM, TEM, FTIR, N 2 porosimetry (BET/BJH method), zeta potential and DRS. Photocatalytic tests were performed in a slurry reactor, with the nanocatalyst in suspension, using RhB as a target molecule, under ultraviolet (UV) and visible radiation. Therefore, the photocatalytic activity of the nanocatalysts (non-doped and hybridized) was evaluated in these ideal conditions, where the AgNPs-Fe 2 O 3 sample showed the best photocatalytic activity with a degradation of 94.1% (k = 0.0222  min −1 , under UV) and 58.36% (k = 0.007  min −1 , under visible), while under the same conditions, the TiO 2 -P25 commercial catalyst showed a degradation of 61.5% (k = 0.0078  min −1 ) and 44.5% (k = 0.0044  min −1 ), respectively. According with the ideal conditions determined, reusability of the AgNPs-Fe 2 O 3 nanocatalyst was measured, showing a short reduction (about 8%) of its photocatalytic activity after 5 cycles. Thus, the Fe 2 O 3 nanocatalyst can be considered a promising catalyst in the heterogeneous photocatalysis for application in the degradation of organic dyes in aqueous solution.

Slurry pipe transport has directed the efforts of researchers for decades, not only for the practical impact of this problem, but also for the challenges in understanding and modelling the complex phenomena involved. The increase in computer power and the diffusion of multipurpose codes based on Computational Fluid Dynamics (CFD) have opened up the opportunity to gather information on slurry pipe flows at the local level, in contrast with the traditional approaches of simplified theoretical modelling which are mainly based on a macroscopic description of the flow. This review paper discusses the potential of CFD for simulating slurry pipe flows. A comprehensive description of the modelling methods will be presented, followed by an overview of significant publications on the topic. However, the main focus will be the assessment of the potential and the challenges of the CFD approach, underlying the essential interplay between CFD simulations and experiments, discussing the main sources of uncertainty of CFD models, and evaluating existing models based on their interpretative or predictive capacity. This work aims at providing a solid ground for students, academics, and professional engineers dealing with slurry pipe transport, but it will also provide a methodological approach that goes beyond the specific application.

The slurry shield tunneling method has been widely used in the construction of underwater tunnels. However, during the construction of submarine tunnels, seawater can influence the engineering properties of bentonite slurry, which can cause excavation instability and other problems. This study aims to investigate the effect of seawater on the properties of bentonite slurry for shield tunneling, including the basic slurry and filter cake properties. Additionally, the infiltration behavior of the slurry after filter cake formation was also studied, the following results being obtained: (1) With an increase in seawater content, the bleeding rate and filtration volume of the slurry increased, and the rheological parameters decreased. (2) With an increase in seawater content, the permeability coefficient of the filter cake increased considerably. Microstructure analysis showed that the agglomeration of particles in the filter cake caused by seawater contamination increased the permeability of the filter cake. (3) The slurry infiltration tests indicated that the infiltration distance increased with increasing seawater content. Additionally, the infiltration of slurries with seawater could not effectively reduce the permeability coefficient of the tunnel face, which could lead to instability of the tunnel face. The findings of this study provide a reference for slurry preparation and stability analyses of submarine tunnel excavations.

Floor aquifers are responsible for approximately 55% of water inrush incidents in coal mines. As mining depths increase, the risk posed by confined floor aquifers becomes more severe. Grouting reinforcement and the sealing of water channels in the mine floor have been widely adopted as mitigation measures. This study investigates the flow and diffusion behavior of grout under hydro-static pressure by examining the fundamental properties of two grout types—pure cement slurry and cement-clay mixture—through orthogonal testing. The influence of grout specific gravity on key properties, including viscosity, bleeding rate, stone formation rate, setting time, and compressive strength, is analyzed. Furthermore, a mechanical model based on grout–rock coupled seepage theory is implemented in COMSOL Multiphysics to simulate grout diffusion. The effects of initial grouting pressure, initial porosity, and initial fracture aperture on grout diffusion radius and rate are systematically evaluated. Results indicate that viscosity, stone formation rate, and compressive strength of both grouts increase with specific gravity, whereas bleeding rate and setting time decrease. Based on the performance tests, mix A2 (pure cement) and B1 (cement-clay) are identified as the optimal proportions for their respective grout types. As grouting pressure decreases, the slurry flow rate gradually slows, and the grouting pressure approaches but remains slightly above the hydro-static pressure. The diffusion rate and radius of grout are positively correlated with the initial fracture aperture and porosity. Once porosity exceeds a critical threshold, grout rapidly infiltrates the fracture, after which the flow rate declines steadily. In a field application, an optimized slurry ratio was employed to treat an aquifer within a coal seam floor at a depth of 140 m. Field surveys confirmed that the grouting parameters satisfied the design requirements, and the grouting performance was effective.

We aimed to determine the relationship between surface chemistry and the rheological properties of silicon anode slurries in lithium-ion batteries. To accomplish this, we investigated the use of various binders such as PAA, CMC/SBR, and chitosan as a means to control particle aggregation and improve the flowability and homogeneity of the slurry. Additionally, we utilized zeta potential analysis to examine the electrostatic stability of the silicon particles in the presence of different binders, and the results indicated that the conformations of the binders on the silicon particles can be influenced by both neutralization and the pH conditions. Furthermore, we found that the zeta potential values served as a useful metric for evaluating binder adsorption and particle dispersion in the solution. We also conducted three-interval thixotropic tests (3ITTs) to examine the structural deformation and recovery characteristics of the slurry, and the results demonstrated that these properties vary depending on the strain intervals, pH conditions, and chosen binder. Overall, this study emphasized the importance of taking into account surface chemistry, neutralization, and pH conditions when assessing the rheological properties of the slurry and coating quality for lithium-ion batteries.

The phase transition characteristics of tailings slurry have a significant impact on the diffusion mechanism of tailings slurry during long-duration grouting. To investigate the diffusion mechanism of tailings slurry in porous media, a Bingham rheological constitutive model was proposed, based on the previous Bingham rheological model, in which both viscosity and yield stress change with time. The rheological properties of the slurry at different temperatures and water-cement ratios were measured through laboratory experiments, and a phase transition constitutive equation was established. Considering the phase transition process of the slurry and the characteristics of the porous media, the diffusion equation of the tailings slurry was derived. Simultaneously, grouting simulation experiments were conducted to verify the correctness of the aforementioned diffusion theory and to obtain the grouting pressure-time development relationship. The results show that under different conditions, the shear stress-shear rate relationship of the slurry conforms to the Bingham constitutive model, with a coefficient of determination exceeding 0.95. The yield stress and viscosity of the slurry increase with increasing temperature and decreasing water-cement ratio. The trends of yield stress-time and viscosity-time changes both satisfy a quadratic function relationship. The water-cement ratio has a greater influence on the rheological properties of the slurry than temperature. Compared with the results of grouting simulation tests, the overall error of the Bingham rheological model theoretical calculation results, in which both yield stress and viscosity change with time, is controlled within 10%. During the grouting process, the pressure-time relationship of tailings slurry in porous media shows a clear “two-stage” growth trend.