Rheological properties and wall-slip behavior of cemented tailing-waste rock backfill (CTWB) paste

Yan, Zepeng; Yin, Shenghua; Chen, Xun; Wang, Leiming

doi:10.1016/j.conbuildmat.2022.126723

Cited by 24 publications

(6 citation statements)

References 30 publications

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“…The rheological properties of a CPB slurry are essential parameters in the transportation and filling process [39,40]. Many scholars have conducted experimental studies on the rheological properties of filling slurries [41,42], especially on the mass concentrations of slurries, materials such as flocculants and water-reducing agents, tailings particle size distributions and properties, temperatures and PH values, and other external environments [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Research on Slurry Flowability and Mechanical Properties of Cemented Paste Backfill: Effects of Cement-to-Tailings Mass Ratio and Mass Concentration

Li,

Fu,

Yang

et al. 2024

Materials

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The flowability and mechanical properties are increasingly crucial in the filling process of deep metal mines with mining depths exceeding 1000 m. The rheological properties of filling slurry in the pipeline were analyzed through rheological tests, L-tube self-flow tests, and semi-industrial loop tests. The results revealed that with an increase in the cement-to-tailings mass ratio (c/t ratio) and mass concentration, the slurry exhibited a higher flow resistance and decreased stowing gradient. During slurry transportation, the pressure loss in the straight pipe was positively correlated with the slurry flow rate, c/t ratio, and mass concentration. A uniaxial compressive strength (UCS) test was conducted to analyze the mechanical properties of the cemented paste backfill containing BMC (CCPB) in both standard and deep-underground curing environments. The UCS of the CCPB showed an increasing trend with the rise in curing age, mass concentration, and the c/t ratio. The comprehensive analysis concluded that when the c/t ratio is 1:4, and the mass concentration is approximately 74%, and parameters such as the slump, bleeding rate, and flowability of the filling slurry meet the criteria for conveying and goaf filling, resulting in a high-strength filling body.

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Section: Introductionmentioning

confidence: 99%

Research on Slurry Flowability and Mechanical Properties of Cemented Paste Backfill: Effects of Cement-to-Tailings Mass Ratio and Mass Concentration

Li,

Fu,

Yang

et al. 2024

Materials

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“…The extraction of ore deposits along the strike forms a rock mass consisting of the natural fractured mass and artificial voids in the form of mine workings, large stopes, and an artificial monolithic massif [4,5]. The physico-mechanical properties of the latter vary during the mining operations [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Interaction of Backfill Mixtures with Natural Rock Fractures within the Zone of Their Intense Manifestation while Developing Steep Ore Deposits

et al. 2023

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Mining systems for ore deposit extraction with the backfilling of the goaf solve the problem of preserving the surface and the complete extraction of rich ores. This paper considers the filling of mined-out stopes with a viscous fluidal solution for the formation of an artificial strong massif, which results in a conglomerate formed on contact with the ore deposit. It was established that exogenous fracturing at the Pivdenno-Belozirske deposit significantly affects the stability of the sides and ceilings in the chamber. This phenomenon can be observed at the first stage of processing. At chambers (the second stage of processing), the artificial rock mass is exposed. It has been established that the chamber mining systems do not ensure the operational stability of the vertical outcrop in the zones of exogenous intensive fracture of the rock mass, especially in the places where they intersect. The zonal location of intense fracture was established along the strike and dip of the steep ore deposit, as was its importance in the formation of rock fallouts. An analytical solution algorithm has been developed to determine the penetration of the backfilling mixture in the plane of the intersection of zones of intense cracking, with opposite azimuths of incidence at steep angles of macrocracking. The features of penetration into microcracks of the backfilling mixture used at the mine, which are affected by their granulometric and physicochemical compositions, have been determined. The influence of the height of the layer and the procedure of backfilling the chamber space in the liquid phase on the formation of the necessary pressure for the opening of a microcrack was studied. The priority of backfilling the exogenous macrocracks with significant gaps and those between tectonic blocks with mixtures has been analytically substantiated and confirmed by experimental methods of research in the mine.

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“…With the increase of mining depth, more and more waste tailings are produced (Liu et al, 2020;Ruan et al, 2021). Statistics show that every 10,000 tons of ore mined will produce 9,300 tons of tailings and 3,400 tons of waste rock (Yan et al, 2022), which not only has serious security hidden dangers, but also destroys the environment and the ecology seriously (Small et al, 2015;Falagán et al, 2016;Li et al, 2022b). In order to protect the ecological environment and make rational use of resources (Aldhafeeri and Fall 2017), tailings backfilling in mines has become an important method of tailings disposal and has extensive application prospect (Cao et al, 2018;Li et al, 2022c;Zheng et al, 2022;Ouattara et al, 2017161).…”

Section: Introductionmentioning

confidence: 99%

Experiment research and mechanism analysis on rheological properties of tailings slurry

Wang

Chen²,

2023

Front. Earth Sci.

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The particle size and content of tailings are important parameters affecting the rheological properties of tailings slurry. To explore their influence law and mechanism on rheological properties, the experiments of tailings slurry were designed and carried out under different particle sizes and content conditions. The rheological properties of the tailings slurry were quantified in the paper. The Bingham body model was used in the texperiment. The “double 30” theory (“particle size of 30.0 μm” and “content of 30%“) was proposed and expounded. The corresponding theoretical model is established to analyze the mechanism of the above results. The conclusion is as follows. The tailings slurry agreeed to different rheological models with different particle size and content. The rheological behavior of the tailings slurry conforms to the Herschel-Bulkley model for the tailings, whose particle size is no larger than 30.0 μm and content is no larger than 30%. With the increase of the content of fine tailings, its behavior agrees better with the Bingham model. The yield stress and viscosity of tailings slurry in the process of transportation are in accordance with the laws of “double 30” theory. “Particle size of 30.0 μm” and “content of 30%” is the critical point of rheological characteristics of tailings. Based on the obtained results, the corresponding theoretical model was established to discuss the mechanism. The rheological laws of tailings slurry can provide theoretical guidance for reducing pressure and preventing pipeline wear in the process of tailings cementation discharge and pipeline transportation in an iron mine.

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Rheological properties and wall-slip behavior of cemented tailing-waste rock backfill (CTWB) paste

Cited by 24 publications

References 30 publications

Research on Slurry Flowability and Mechanical Properties of Cemented Paste Backfill: Effects of Cement-to-Tailings Mass Ratio and Mass Concentration

Research on Slurry Flowability and Mechanical Properties of Cemented Paste Backfill: Effects of Cement-to-Tailings Mass Ratio and Mass Concentration

Mechanism of Interaction of Backfill Mixtures with Natural Rock Fractures within the Zone of Their Intense Manifestation while Developing Steep Ore Deposits

Experiment research and mechanism analysis on rheological properties of tailings slurry

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