Potential use of densified polymer-pastefill mixture as waste containment barrier materials

Fall, Mamadou; Célestin, J.C.; Sen, Hanim

doi:10.1016/j.wasman.2010.07.016

Cited by 40 publications

(6 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There has been extensive research on the definition of paste, especially in terms of yield stress. For instance, Fall classifies the slurry with a yield stress of over 200 ± 25 Pa as paste (Fall et al, 2010;Jewell et al, 2002). In China, paste is considered to feature a slump between 15~25 cm and a segregation degree below 2 cm (Liu et al, 2001;Wang et al, 2010).…”

Section: The Basic Concept Of Pastementioning

confidence: 99%

Development and challenge of paste technology in China

Wu¹,

Yang²,

Zhang³

2017

Proceedings of the International Seminar on Paste and Thickened Tailings

View full text Add to dashboard Cite

As paste technology can effectively ensure safe mining conditions and realize green mining, it has been popularized and widely applied in China in recent years. Meanwhile, with the development of intelligent control, precise preparation and personalized filling, studies on paste technology in China have also been deepened. In this paper, the basic concepts and characteristics of paste technology were introduced, and the development of paste technology in China was analyzed statistically. It systematically analyzed the latest research progress in thickening dewatering of unclassified tailings, pipeline transportation of structure flow, multi-field influence in stopes, development of new materials and construction of paste engineering laboratory. The practical effects of paste technology in underground backfill and surface deposition were also introduced. In the future, paste technology will achieve great breakthroughs by digitization and intelligence and realize adaptive control of concentration, precision preparation of paste, personalized filling of stopes and 3D and modular design and assembly of system, leading mining industry in China to the path of green development.

show abstract

Section: The Basic Concept Of Pastementioning

confidence: 99%

Development and challenge of paste technology in China

Wu¹,

Yang²,

Zhang³

2017

Proceedings of the International Seminar on Paste and Thickened Tailings

View full text Add to dashboard Cite

show abstract

“…Compared with the traditional paste-filling method, the filling technology is simple, the material preparation is simple, and the investment is small. This technology has a broad application prospect in low-cost scale treatment of gangue, reduction of over-burden subsidence, and protection of water resources in mining areas [14,15].…”

Section: Introductionmentioning

confidence: 99%

Study on the Slurry Diffusion Law of Fluidized Filling Gangue in the Caving Goaf of Thick Coal Seam Fully Mechanized Caving Mining

Huang

Zuo

et al. 2022

Energies

View full text Add to dashboard Cite

Because of the problem of gangue discharge and surface subsidence during coal mining, the current research on underground filling mainly focuses on the paste filling, solid filling, and grouting filling of the overburden separation layer after scaffolding. We proposed the technology of fluidization gangue grouting for filling the collapse area based on our previous research. The prediction method of residual space in the collapse area and the diffusion law of gangue fluidization filling slurry are two essential points for successfully implementing the technology and maximizing the use of goaf for gangue backfilling and reducing overburden settlement. To further explore the remaining space distribution law of the collapsed goaf in thick seam fully mechanized top coal caving mining and the effect of coal gangue fluidization filling, the caving goaf of the 3307 fully mechanized top coal caving face in Sangshuping No. 2 coal mine in the Weibei mining area was detected by the transient electromagnetic method. We studied the distribution law of the measured abnormal area in the caving goaf, which reflects the distribution law of the remaining space from one aspect. The coefficient of the remaining space was calculated to be 19.5%. Then, we applied COMSOL simulation software. The diffusion law of coal gangue fluidized slurry in the caving goaf was simulated and analyzed. It shows that the most obvious diffusion direction of the coal gangue slurry is the trend of the gradual expansion of the “cavity pore” multi-type residual space, indicating that with the increase in the diffusion distance, the diffusion resistance gradually increases, and the slurry morphology gradually presents the “claw” form. According to the space theory and fractal dimension theory, the prediction method of the remaining space in the caving goaf is given, and the design basis of the filling drilling parameters is determined. Finally, the field-filling test was carried out. The results show that the high- and low-level fluidized filling in the caving goaf can safely and efficiently handle the gangue in the mine, and the residual space characteristics and slurry diffusion law in the caving goaf are consistent with the above. The research results provide theoretical support for the fluidization filling technology of coal gangue in thick seam fully mechanized top coal caving areas.

show abstract

“…Researchers studying mine backfill paste think that the paste can only be formed if the content of under-20 μm particles is not less than 15%. Many studies [3,4] show that under-20 μm particle content has a significant impact on paste fluidity, and the paste has better fluidity when under-20 μm content is 15-20%. Wang et al [5] studied the influence of different particle size ranges on the slurry bleeding rate by uniform design.…”

Section: Introductionmentioning

confidence: 99%

New Definition of Ultrafine Particles in Mine Paste and Its Relationship with Rheological Properties

Xie

Qiao

Han

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

Mine backfill paste is generally composed of tailings and coarse aggregates. In engineering practice, the definitions in fill material classification are vague. In this paper, the size range of ultrafine particles is defined by the Stokes sedimentation test and hydraulic coarseness method. The size range of ultrafine particles is affected not only by the geometric size of the particles but also by the physical characteristics of the particles themselves. This definition has more comprehensive considerations and stricter physical and mathematical significance than the traditional definition of ultrafine particles based only on size. There is a strong correlation between ultrafine particles in fill materials and the rheological properties of the mine backfill paste. In this study, through experiments and correlation analysis, it was found that the content of ultrafine particles is positively correlated with the plastic viscosity of the mine backfill paste, and its growth range is exponential. The coarse aggregate content is positively correlated with the yield stress of the mine backfill paste. A regression analysis model was established for the rheological properties of mine backfill paste. The model has few factors and high correlation, so it can simply and efficiently predict the rheological properties of mine backfill paste and guide engineering practice.

show abstract

Potential use of densified polymer-pastefill mixture as waste containment barrier materials

Cited by 40 publications

References 23 publications

Development and challenge of paste technology in China

Development and challenge of paste technology in China

Study on the Slurry Diffusion Law of Fluidized Filling Gangue in the Caving Goaf of Thick Coal Seam Fully Mechanized Caving Mining

New Definition of Ultrafine Particles in Mine Paste and Its Relationship with Rheological Properties

Contact Info

Product

Resources

About