Effect of High Mixing Intensity on Rheological Properties of Cemented Paste Backfill

Yang, Liuhua; Wang, Hongjiang; Li, Hong; Zhou, Xinchi

doi:10.3390/min9040240

Cited by 26 publications

(7 citation statements)

References 45 publications

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“…The weakening effect of SWP on the UCS and elastic modulus are consistent with the findings reported by Hou et al (2020). In addition, the mechanical properties of CTB are related to its internal microstructure (Yang et al, 2019;Zhou et al, 2019;Tana et al, 2021); the results indicated that the seepage would cause a certain degree of damage to the internal microstructure of CTB.…”

Section: Effect Of Seepage On Mechanical Properties Of Ctbsupporting

confidence: 85%

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Shen

Chen

et al. 2022

Front. Mater.

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Cemented tailing backfill (CTB) in underground mine inevitably experiences seepage field, which complicates its mechanical behavior. In this study, the mechanical properties and microstructure characteristics of CTB under different seepage water pressures (SWPs) were investigated. The results show that, with the increase in SWP, the mechanical properties of CTB decrease, but the decreasing trend reduces gradually. Higher SWP leads the microstructure of CTB looser and more porous, and the largest proportion of pores initiated and propagated by SWP is micropores, which means the damage in CTB under seepage is mostly caused by micropores. Besides, the mechanical properties of CTB under seepage decrease exponentially with the increase in porosity and present linearly inverse proportional relation to the pore area fractal dimension. Results above indicate that SWP has a significant deterioration effect on the mechanical properties and microstructure of CTB. The research could not only extend the knowledge of mechanical properties and microstructure characteristics of CTB under seepage but also provide a theoretical reference for mechanical index determination and stability analysis of CTB in water-rich underground mines.

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Section: Effect Of Seepage On Mechanical Properties Of Ctbsupporting

confidence: 85%

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Shen

Chen

et al. 2022

Front. Mater.

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“…The spread test of filling slurry adopts a metal frustum with a top diameter of 36 mm, a bottom diameter of 60 mm and a height of 60 mm (Chen et al, 2020;Li W et al, 2020), as shown in Figure 6. R/S SST rheometer was used to test the rheological parameters of filling slurry (Yang et al, 2019;Cheng et al, 2020;Kou et al, 2020), as shown in Figure 7.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Remediation of grassland subsidence and reduction of land occupation with tailings backfill technology: a case study of lead-zinc mine in Inner Mongolia, China

Chen

Guo

Zhou³

et al. 2023

Front. Environ. Sci.

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The mining industry provides essential mineral resources for human society’s development. However, this industry generates a large quantity of waste material while rapidly extracting valuable elements from ore, such as processed tailings. The existence of mined voids will cause surface subsidence, and the surface stockpiling of tailings and waste rocks occupy a large amount of land and the risk of Tailings Storage Facility (TSF) failure. This paper proposes tailings backfill technology to mitigate surface subsidence and provides an alternative disposal method for tailings generated during ore extraction. Tailings backfill technology prepares the slurry by adding a certain amount of cementitious material into the tailings and transporting it to the underground goaf through a pipeline. The backfill slurry could then gradually build up its strength during the hydration of. Cementitious material. A case study of a lead-zinc mine in the Inner Mongolia Autonomous Region of China using tailings backfill technology was introduced in detail to solve the problems of grassland collapse caused by mine excavation and environmental damage due to tailings disposal. Spread test and rheological test were carried out to study the flow characteristics of filling slurry and the uniaxial compressive strength (UCS) of backfill was tested as well. The result illustrates that the spread of the filling slurry with a solid content between 72% and 76% and cement-tailings ratio between 1:4 and 1:8 is greater than 14 cm, and the UCS of backfill is above 1 MPa. The research shows that the tailings backfill technology recycles tailings waste while mitigating surface grassland subsidence and land occupation of waste disposal. Tailings backfill technology can significantly reduce tailings discharge or even achieve no discharge. A leaching test for heavy metal element classification of the backfill sample was carried out. The results show that the heavy metal detection indicators meet the environmental protection standard requirements and will not cause secondary environmental pollution. Therefore, tailings backfill technology can realize green and efficient management of mine waste and has great application and promotion prospects.

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“…Before the experimental analysis, the mills tailings were placed in a drying box furnace and naturally cooled to prepare the paste tailings samples. Particle size distribution (PSD) of the tailings specimens was determined (Figure 1) using the size analysis and determination of soil constants procedure (ASTM D421) [20] and Malvern top sizer laser particle size analyzer (Shanghai, China) [21]. Many paste tailings were used wet in order to conduct a set of experimental tests needed for material characterization.…”

Section: Tailings Characteristics Based On Elements Collected Through Jinchuan Nickel Mine Sitementioning

confidence: 99%

Investigation on Mechanical Characteristics and Microstructure of Cemented Whole Tailings Backfill

2021

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A paste backfill performance can be primarily evaluated through the mechanical and physical characteristics of the components involved. In this study, the effects of solid components’ tailings, binders and waters contents on microstructural evolution and mechanical properties of uncemented whole tailings backfill (CWTB) mixtures were investigated. Different mixtures of ordinary Portland cement of 1, 3 and 5 wt. % and solid concentrations at 72 wt. %, 74 wt. % and 75 wt. % were selected and rheological test was conducted to define the slump fluidity and yield stress. The microstructure of the solid component before and after the preparation and chemical composition were analyzed by the Scanning electron microscope and XRD analysis, respectively. The results show that a positive correlation between yield stress and slump values of CWTB paste slurries, the decrease of flow consistence leads to the reduction of the water content on the CWTB mixtures and the flow resistance of the paste. With the highest solids content, unconfined compressive strength (UCS) of CWTB varies between 0.1–0.9 MPa. Increasing the solid content affects the porosity and improves the strength resistance of CWTB mixtures. The findings in this study can therefore lead us to a statement that CWTB chemical components seem to be an important factor in cemented paste backfill (CPB) design and mine operations.

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Effect of High Mixing Intensity on Rheological Properties of Cemented Paste Backfill

Cited by 26 publications

References 45 publications

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Remediation of grassland subsidence and reduction of land occupation with tailings backfill technology: a case study of lead-zinc mine in Inner Mongolia, China

Investigation on Mechanical Characteristics and Microstructure of Cemented Whole Tailings Backfill

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