Flow Characteristics of Fresh Cemented Paste Backfill Containing Flocculant under Variable Shear Rate Based on Water Migration

Wang, Shi; Song, Xuepeng; Wei, Meiliang; Liu, Wu; Wang, Xiaojun; Ke, Yuxian; Tao, Tiejun; Liu, Hongbin

doi:10.1007/s42461-022-00612-1

Cited by 4 publications

(4 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, with the addition ratio of 5 g/t APAM as the cut-off point, the shear stress increased with the ratio of APAM additive increasing from 0 to 5 g/t, and the shear stress curves moved down and converged when the addition ratio of APAM was more than 5 g/t, concentrated in the region, which was consistent with the change law of yield stress. According to the research results of Wang et al [19], the flocculant network structure formed by APAM was stronger than the flocculant network structure formed by particle self-flocculation, which corresponded to the test results. It is also known from the test results that excessive flocculants had negative effects on the flocculant network structure.…”

Section: Effect Of Stirring Timesupporting

confidence: 74%

“…Based on the double electron layer structure of fine tailings particles, the water molecules in the adsorption layer were closely arranged on the surface of tailings particles to form bound water under the action of static electricity, while the adhesion of water molecules in the diffusion layer was slightly weak to form viscous water, and the water in the two layers was collectively referred to as adsorbed water. Moreover, the flocculant network structure formed by flocculant molecular bridging would wrap the free water in the slurry, which would be transformed into flocculent water with poor fluidity, which would make the fluidity of the slurry worse [19].…”

Section: Mechanism Analysismentioning

confidence: 99%

See 1 more Smart Citation

Effect of Flocculants Residue on Rheological Properties of Ultra-Fine Argillaceous Backfilling Slurry

Zheng

et al. 2022

Materials

View full text Add to dashboard Cite

Tailings concentration is indispensable for backfilling. Additionally, the residual flocculants in the concentration process affect the rheological properties of ultra-fine argillaceous backfilling slurry (e.g., viscosity and yield stress), resulting in a great effect on the fluidity and resistance of pipeline transportation. In this study, to explore the effect of flocculants residue on the rheological properties of the slurry, a series of rheological tests (constant shear rate test and variable shear rate test) were performed by changing the type, dosage, stirring time, temperature of flocculants addition and the amount of binder added. The results showed that the addition of flocculants increased the viscosity and yield stress of slurry. At a certain amount of flocculants additive, the flocculant network structure reached the best development state, which had a positive effect on increasing slurry viscosity and yield stress. As the stirring time increased, the scale of damage to the flocculant network structure became larger, which had a negative effect on increasing slurry viscosity and yield stress. Low temperature weakened the adsorption and bridging effect of polymeric chains, resulting in a poorly developed flocculant network structure, which had a negative effect on increasing slurry viscosity and yield stress. Caused by hydration products, the viscosity and yield stress of slurry with binder further increased. This study is significant for an in-depth study of the rheological and pipeline transport characteristics of ultra-fine argillaceous backfilling slurry, optimising the selection of flocculants for ultrafine particles, guiding backfill parameters and improving the reliability of pipeline transport.

show abstract

Section: Effect Of Stirring Timesupporting

confidence: 74%

Section: Mechanism Analysismentioning

confidence: 99%

Effect of Flocculants Residue on Rheological Properties of Ultra-Fine Argillaceous Backfilling Slurry

Zheng

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…CTBS is mainly prepared from tailings and cementitious materials with the addition of a certain proportion of water 9 . The fluidity of CTBS depends on the duration of freshness and rheological properties 10,11 . The factors affecting the freshness of CTBS mainly include ash‐sand ratio, mass concentration, external additives, type of filling material, and so forth 12,13 .…”

Section: Introductionmentioning

confidence: 99%

“…9 The fluidity of CTBS depends on the duration of freshness and rheological properties. 10,11 The factors affecting the freshness of CTBS mainly include ash-sand ratio, mass concentration, external additives, type of filling material, and so forth. 12,13 Under certain conditions, the addition of anti-hardening agent could enhance the duration of freshness of CTBS, which is beneficial to the transport of CTBS, but not conducive to the hardening of CTBS to form compressive strength.…”

mentioning

confidence: 99%

Flow visualization simulation of cemented tailings backfill slurry by particle tracking technology

Sun

Gan

Zhi

et al. 2022

Engineering Reports

View full text Add to dashboard Cite

Pipeline flow visualization of cemented tailings backfill slurry (CTBS) improves the safety and stability of transportation. High turbidity and low resolution make it difficult for conventional methods to monitor the particle distribution state of CTBS in a short period of time. Particle tracking technology (PTT) is used to simulate and investigate the flow characteristics of CTBS pipeline, combine with theoretical analysis to construct a CTBS pipeline visualization model, elaborate the particle distribution state when CTBS flows in the pipeline, and explore the effects of pipe diameter (PD), flow velocity (FV) and tailings gradation (TG) on the particle distribution. The results show that particle tracking technology is better applied to investigate the particle transport distribution characteristics of CTBS tailings. Three concepts of particle accumulated gravity Ga, static friction angle θ and diameter dividing line are defined, and the transport pipe is divided into light wear zone, medium wear zone and heavy wear zone. The increase in pipe diameter increases the content of fine particles at the pipe wall and the thickness of the lubrication layer becomes larger, which improves the safety and stability of CTBS transport. The increased flow velocity reduces the settling phenomenon of large size particles and improves the transport efficiency, which increases the pipeline transport resistance. Under good tailings grading conditions, a wide range of tailings grading is more suitable as backfill material. The results of the study illustrate the flow characteristics of the backfill slurry in the pipeline from the particle perspective and provide a theoretical basis for pipeline transportation research.

show abstract

Study on mechanical properties and damage characteristics of rice straw fiber-reinforced cemented tailings backfill based on energy evolution

Song

Dong

Hao

et al. 2023

Environ Sci Pollut Res

View full text Add to dashboard Cite

Flow Characteristics of Fresh Cemented Paste Backfill Containing Flocculant under Variable Shear Rate Based on Water Migration

Cited by 4 publications

References 38 publications

Effect of Flocculants Residue on Rheological Properties of Ultra-Fine Argillaceous Backfilling Slurry

Effect of Flocculants Residue on Rheological Properties of Ultra-Fine Argillaceous Backfilling Slurry

Flow visualization simulation of cemented tailings backfill slurry by particle tracking technology

Study on mechanical properties and damage characteristics of rice straw fiber-reinforced cemented tailings backfill based on energy evolution

Contact Info

Product

Resources

About