Features of pipe transportation of paste-like backfilling in deep mine

Wang, Xinmin; Zhao, Jianwen; Xue, Jianyang; Yu, Guofeng

doi:10.1007/s11771-011-0855-7

Cited by 21 publications

(19 citation statements)

References 2 publications

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“…The velocity variation trend shows an increase in the vertical pipe and a decrease in the horizontal pipe; the maximum velocity occurs at the elbow of the pipe. The mine backfill experience of South Africa indicated that the velocity of the horizontal pipe should not exceed 4 m/s [19]. Therefore, the two proportioning schemes both meet the requirements of backfill.…”

Section: Recoverabilitymentioning

confidence: 99%

“…The mine backfill experience of South Africa indicated that the velocity of the horizontal pipe should not exceed 4 m/s [19]. Therefore, the two proportioning schemes both meet the requirements of backfill.…”

Section: Recoverabilitymentioning

confidence: 99%

“…For this mine, the common fluidity experiments in the laboratory, such as slump tests, diffusivity and the looping pipe experiment, however, cannot fully reflect the flow state and the pipeline resistance. The computational fluid dynamics (CFD) technology is applied to study the pressure and velocity of slurry transport by building a pipeline transportation model [19][20][21]. Thus, it is also a reliable way to illustrate the details of slurry transport resistance and flow state.…”

Section: Physicochemical Propertiesmentioning

confidence: 99%

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Feasibility of Recycling Ultrafine Leaching Residue by Backfill: Experimental and CFD Approaches

et al. 2017

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Large amounts of leaching residue are released into tailings dams from mines, and their acid content can cause environmental pollution. The aim of this study was to research the feasibility and value of a leaching residue backfill recycling method. The combination of property detection, laboratory tests (the neutralization method, strength test and diffusivity test) and numerical simulation methods (3D computational fluid dynamics (CFD) simulations of pipeline transportation properties) were used to assess the performance of the leaching residue backfill. The results show that backfill body with the cement:sand mass ratio of 1:3, the leaching residue:classified tailings ratio of 1:6, and slurry mass concentration of 71 wt % can meet the strength and pipeline self-flowing transportation requirements of mine backfill. The leaching residue is a good backfill aggregate, and its recovery ratio can reach 19.5 wt %. In addition, the recycling of leaching residue effectively alleviates the problem of mine waste emissions and protects the ecological environment surrounding the mining area. This study serves as a guide for the recycling of fine tailings and the environmental governance of the mining area.

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Section: Recoverabilitymentioning

confidence: 99%

Section: Recoverabilitymentioning

confidence: 99%

Section: Physicochemical Propertiesmentioning

confidence: 99%

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Feasibility of Recycling Ultrafine Leaching Residue by Backfill: Experimental and CFD Approaches

et al. 2017

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“…In previous studies, paste-like tailings slurry (PLTS) was simplified as a Bingham plastic fluid, whose flow properties were time-independent, and the existing empirical formulas for calculating the hydraulic gradient of a paste-like flow were derived based on the time-invariant Bingham model [7]. However, an increasing number of studies have shown that the rheological characteristics of PLTS are consistent with those of a pseudo-plastic fluid, and the existing empirical formulas are optimal for calculating the error and for small applications [8].…”

Section: Introductionmentioning

confidence: 99%

Time-Varying Hydraulic Gradient Model of Paste-Like Tailings in Long-Distance Pipeline Transportation

Wang

2017

Advances in Materials Science and Engineering

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Paste-like tailings slurry (PTLS) is always simplified as a Bingham plastic fluid, leading to excessive computational errors in the calculation of the hydraulic gradient. In the case of paste-like tailings in long-distance pipeline transportation, to explore a highprecision and reliable hydraulic gradient formula, the rheological behavior of paste-like tailings slurry was analyzed, a time-varying hydraulic gradient model was constructed, and a series of laboratory shear tests were conducted. The results indicate that the PTLS shows noticeable shear-thinning characteristics in constant shear tests; the calculated hydraulic gradient declined by about 56%, from 4.44 MPa⋅km −1 to 1.95 MPa⋅km −1 within 253 s, and remained constant for the next four hours during the pipeline transportation. Comparing with the balance hydraulic gradient obtained in a semi-industrial loop test, the computational errors of those calculated by using the time-varying hydraulic gradient model, Jinchuan formula, and Shanxi formula are 15%, 78%, and 130%, respectively. Therefore, our model is a feasible and high-precision solution for the calculation of the hydraulic gradient of paste-like tailings in long-distance pipeline transportation.

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“…Backfill mining technology plays a significant role in environmental protection and the prevention of water resource pollution [1,2]. Therefore, it is being widely and intensively employed in the global mining industry.…”

Section: Introductionmentioning

confidence: 99%

Cemented Backfilling Technology of Paste-Like Based on Aeolian Sand and Tailings

2016

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Aeolian sand, tailings, and #32.5 Portland cement were used to produce backfilling aggregate, and physicochemical evaluations and proportioning tests were conducted. It is revealed that a mixture of aeolian sand and tailings can be used as a backfilling aggregate for the complementarities of their physicochemical properties; e.g., high Al 2 O 3 content in the aeolian sand and CaO content in the tailings, coarse particles of aeolian sand and fine particles of tailings, etc. In addition, the optimal backfilling aggregate was shown to have a mass fraction of 72%-74%, a cement-sand ratio of 1:8, and an aeolian sand proportion of 25%. Furthermore, viscometer tests were used to analyze the rheological characteristics, and the slurry in these optimized proportions exhibited shear thinning phenomena with an initial yield stress, which belongs to paste-like-a cemented backfilling slurry with a higher mass fraction than a two-phase flow and better flowability than a paste slurry. Finally, the application of this backfilling technology shows that it can not only realize safe mining, but also bring huge economic benefits, and has some constructive guidance for environmental protection.

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Features of pipe transportation of paste-like backfilling in deep mine

Cited by 21 publications

References 2 publications

Feasibility of Recycling Ultrafine Leaching Residue by Backfill: Experimental and CFD Approaches

Feasibility of Recycling Ultrafine Leaching Residue by Backfill: Experimental and CFD Approaches

Time-Varying Hydraulic Gradient Model of Paste-Like Tailings in Long-Distance Pipeline Transportation

Cemented Backfilling Technology of Paste-Like Based on Aeolian Sand and Tailings

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