Numerical study on the pipe flow characteristics of the cemented paste backfill slurry considering hydration effects

Lang Liu, Zhiyu Fang, Chongchong Qi, Bo Zhang, Lijie Guo, K. I-I L. Song

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Cemented paste backfill (CPB) plays a vital role in tailings management where the CPB slurry is hydraulically conveyed from the surface to underground voids in pipelines. To enhance transport efficiency, accurate prediction of their flow characteristics is always required during CPB design. The objective of this study is to investigate the flow characteristics of the CPB slurry by using computational fluid dynamics (CFD) method. In this method, a mixture model was utilized to represent the multi-phase characteristics of pipe flow and a reaction flow model was used to consider the hydration effect. The performance of the mixing model was verified using the experimental results and the influence of the cement hydration was discussed. A comprehensive sensitivity study was performed to investigate the coupled effect of the tailings-to-cement ratio (TCR), inlet velocity (IV), slurry concentration (SC) and particle size (PS). The results indicated that three zones were formed during pipe transportation due to the deposition of coarse tailings and the suspension of fine tailings. The velocity along the pipe cross-section was arch-like with a high velocity near the middle and low velocity near the wall. Cement hydration needs to be considered in the pipe system design and all influencing factors (TCR, IV, SC and PS) had important effects on the pipe flow of CPB transportation. The obtained results can provide guiding significance to the mining industry and backfill practitioners during the pipe system design. (C) 2018 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)454-464
Number of pages11
JournalPowder Technology
Volume343
DOIs
Publication statusPublished - 1 Feb 2019

Cite this

Liu, Lang ; Fang, Zhiyu ; Qi, Chongchong ; Zhang, Bo ; Guo, Lijie ; Song, K. I-I L. / Numerical study on the pipe flow characteristics of the cemented paste backfill slurry considering hydration effects. In: Powder Technology. 2019 ; Vol. 343. pp. 454-464.
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abstract = "Cemented paste backfill (CPB) plays a vital role in tailings management where the CPB slurry is hydraulically conveyed from the surface to underground voids in pipelines. To enhance transport efficiency, accurate prediction of their flow characteristics is always required during CPB design. The objective of this study is to investigate the flow characteristics of the CPB slurry by using computational fluid dynamics (CFD) method. In this method, a mixture model was utilized to represent the multi-phase characteristics of pipe flow and a reaction flow model was used to consider the hydration effect. The performance of the mixing model was verified using the experimental results and the influence of the cement hydration was discussed. A comprehensive sensitivity study was performed to investigate the coupled effect of the tailings-to-cement ratio (TCR), inlet velocity (IV), slurry concentration (SC) and particle size (PS). The results indicated that three zones were formed during pipe transportation due to the deposition of coarse tailings and the suspension of fine tailings. The velocity along the pipe cross-section was arch-like with a high velocity near the middle and low velocity near the wall. Cement hydration needs to be considered in the pipe system design and all influencing factors (TCR, IV, SC and PS) had important effects on the pipe flow of CPB transportation. The obtained results can provide guiding significance to the mining industry and backfill practitioners during the pipe system design. (C) 2018 Elsevier B.V. All rights reserved.",
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Numerical study on the pipe flow characteristics of the cemented paste backfill slurry considering hydration effects. / Liu, Lang; Fang, Zhiyu; Qi, Chongchong; Zhang, Bo; Guo, Lijie; Song, K. I-I L.

In: Powder Technology, Vol. 343, 01.02.2019, p. 454-464.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Numerical study on the pipe flow characteristics of the cemented paste backfill slurry considering hydration effects

AU - Liu, Lang

AU - Fang, Zhiyu

AU - Qi, Chongchong

AU - Zhang, Bo

AU - Guo, Lijie

AU - Song, K. I-I L.

PY - 2019/2/1

Y1 - 2019/2/1

N2 - Cemented paste backfill (CPB) plays a vital role in tailings management where the CPB slurry is hydraulically conveyed from the surface to underground voids in pipelines. To enhance transport efficiency, accurate prediction of their flow characteristics is always required during CPB design. The objective of this study is to investigate the flow characteristics of the CPB slurry by using computational fluid dynamics (CFD) method. In this method, a mixture model was utilized to represent the multi-phase characteristics of pipe flow and a reaction flow model was used to consider the hydration effect. The performance of the mixing model was verified using the experimental results and the influence of the cement hydration was discussed. A comprehensive sensitivity study was performed to investigate the coupled effect of the tailings-to-cement ratio (TCR), inlet velocity (IV), slurry concentration (SC) and particle size (PS). The results indicated that three zones were formed during pipe transportation due to the deposition of coarse tailings and the suspension of fine tailings. The velocity along the pipe cross-section was arch-like with a high velocity near the middle and low velocity near the wall. Cement hydration needs to be considered in the pipe system design and all influencing factors (TCR, IV, SC and PS) had important effects on the pipe flow of CPB transportation. The obtained results can provide guiding significance to the mining industry and backfill practitioners during the pipe system design. (C) 2018 Elsevier B.V. All rights reserved.

AB - Cemented paste backfill (CPB) plays a vital role in tailings management where the CPB slurry is hydraulically conveyed from the surface to underground voids in pipelines. To enhance transport efficiency, accurate prediction of their flow characteristics is always required during CPB design. The objective of this study is to investigate the flow characteristics of the CPB slurry by using computational fluid dynamics (CFD) method. In this method, a mixture model was utilized to represent the multi-phase characteristics of pipe flow and a reaction flow model was used to consider the hydration effect. The performance of the mixing model was verified using the experimental results and the influence of the cement hydration was discussed. A comprehensive sensitivity study was performed to investigate the coupled effect of the tailings-to-cement ratio (TCR), inlet velocity (IV), slurry concentration (SC) and particle size (PS). The results indicated that three zones were formed during pipe transportation due to the deposition of coarse tailings and the suspension of fine tailings. The velocity along the pipe cross-section was arch-like with a high velocity near the middle and low velocity near the wall. Cement hydration needs to be considered in the pipe system design and all influencing factors (TCR, IV, SC and PS) had important effects on the pipe flow of CPB transportation. The obtained results can provide guiding significance to the mining industry and backfill practitioners during the pipe system design. (C) 2018 Elsevier B.V. All rights reserved.

KW - Cemented paste backfill

KW - Slurry

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KW - Flow characteristics

KW - Mixture model

KW - Hydration effect

KW - UNCONFINED COMPRESSIVE STRENGTH

KW - RECYCLING WASTE TAILINGS

KW - FLY-ASH SLURRY

KW - PRESSURE-DROP

KW - 2-PHASE FLOW

KW - PERFORMANCE-CHARACTERISTICS

KW - PREDICTION

KW - MODEL

KW - CFD

KW - PARTICLES

U2 - 10.1016/j.powtec.2018.11.070

DO - 10.1016/j.powtec.2018.11.070

M3 - Article

VL - 343

SP - 454

EP - 464

JO - Powder Technology

JF - Powder Technology

SN - 0032-5910

ER -