Study on the effect of multi-source solid waste on the performance of its backfill slurry

Zhao, Xinyuan; Yang, Ke; Wei, Zhen; He, Xiang; Chen, R.

doi:10.1016/j.heliyon.2023.e16251

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…During the filling process of CGFB, it is necessary to ensure that the CGFB slurry is efficiently transported to the designated area without pipeline clogging, which requires the CGFB slurry to have smooth transportability [15]. The rheological parameters of the slurry are influenced by its chemistry (binder hydration), hydraulics (suction development), and other factors [16,17]. Due to the makeup of CGFB, the binders used (cement) react chemically with water, also known as binder hydration, producing hydration products and consuming water [18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Viscoelastic-Plastic Properties of Fresh Cemented Gangue Fly Ash Backfill Slurries

Hao,

Song,

Wang

et al. 2024

Minerals

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In underground filling mining, freshly prepared cemented gangue-fly ash backfill (CGFB) slurries are typically piped into the gobs. The rheological properties of backfill slurry during pipeline transportation have a direct impact on the transportation characteristics, which in turn affect pipeline blockage and wear. In this paper, the rheological behavior and viscoelastic-plastic properties of CGFB during pipeline transportation are investigated. The effects of different solid content and cement content on resistivity were tested experimentally, and their viscoelasticity and plasticity were analyzed. The results show that with the increase in solid phase content and cement content, the viscosity, yield stress, and energy storage modulus of the materials showed an increasing trend. The viscosity and yield stress of the material both increased, reaching 32.77% and 51.22%, respectively. It was found by the dynamic shear test that in the low-strain region, the material showed a more significant elastic nature of the solid, while in the high-strain region, the viscosity of the material gradually increased. Cement has a substantially lower resistivity than fly ash and gangue, and with the increase in solid concentration, the resistivity of the material shows an increasing trend. With the increase in cement content, the resistivity generally shows a decreasing trend, but it should be noted that the resistivity change trend may tend to stabilize after the cement content exceeds 12%. The study’s findings can aid in understanding the rheological properties of CGFB and its viscoelastic-plastic behavior during the underground filling and conveying process, which can provide a reference basis for research and application in related fields.

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Section: Introductionmentioning

confidence: 99%

Investigation of Viscoelastic-Plastic Properties of Fresh Cemented Gangue Fly Ash Backfill Slurries

Hao,

Song,

Wang

et al. 2024

Minerals

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“…Although there also have been research results on the multi-source CSW for underground backfilling in recent years, for example, Zhang et al 27,28 used orthogonal experiments to study the mix proportion and mechanical properties of multi-source coal-based solid waste backfill materials, Wei et al 29 used RSM to study the mix proportions of four types of coal-based solid waste, Zhao et al 30,31 researched on the effects and proportions of four types of multi-source CSW, the current research and application are still not extensive and in-depth enough. Moreover, five kinds of CSW are used to prepare underground backfilling materials, with many types, complex compositions and unknown properties.…”

mentioning

confidence: 99%

Mix proportion and microscopic characterization of coal-based solid waste backfill material based on response surface methodology and multi-objective decision-making

Zhao,

Yang,

et al. 2024

Sci Rep

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The mix proportion of multi-source coal-based solid waste (CSW) for underground backfilling affects transportation and support performance of backfill materials, and even the backfilling cost. In this study, the optimal mix proportion of desulfurization gypsum (DG), furnace bottom slag (FBS) and gasification fine slag (GFS) is determined by the Response Surface Methodology–Box Behnken Design (RSM-BBD). Then the fluidity, bleeding rate, 3-day strength, 7-day strength and preparation cost are evaluation indicators, the optimal mix proportion of backfill materials is determined by the multi-objective decision-making method (MDM). Finally, the microstructure of the backfill material with optimal mix proportion was studied by TGA, MIP, SEM–EDS and XRD. The results show that the mix proportion of CSW with the optimal comprehensive index is coal gangue (CG): coal fly ash (CFA): DG: FBS: GFS = 1:1.5:0.2:0.1:0.1, the mass concentration is 78%, and ordinary Portland cement (OPC)/CSW = 7.5%. The weight loss phenomenon of the backfill material with the optimal mix proportion occurs continuously during the heating process, mainly due to the evaporation of crystal water, structural water and hydroxyl water. There are dense narrow-necked pores in the backfill material, and the pore connectivity is poor. There is no hydration reaction occurs between CSW particles, and the strength increase of the backfill material mainly depends on the hydration reaction of cement. In ettringite, part of Al2O3 is replaced by SiO2, and part of CaSO4 is replaced by CaCO3. This study provides a reference for the engineering application of underground backfilling with multi-source CSW.

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Experimental study on the production of carbon-absorbing backfill material from freshly mixed modified magnesium slag slurry

Sun,

Liu,

Fang

et al. 2024

Geomech. Geophys. Geo-energ. Geo-resour.

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Wet carbonisation of alkaline industrial solid waste is considered to be an effective method for CO2 capture/processing of solid waste resources. Aiming at the high-value utilisation of modified magnesium slag in Shaanxi Province, a new method for producing carbon absorption backfill materials (CABM) is proposed by introducing CO2 into freshly mixed modified magnesium slag slurry. Through rheological, mini-slump, isothermal microcalorimeter test, uniaxial compressive strength, X-ray diffraction (XRD), thermogravimetry (TG-DTG) and scanning electron microscopy (SEM) experiments, the effects of CO2 on the fluidity, hydration, mechanical and microstructural properties of freshly modified magnesium slag slurry are investigated. The results show that: (1) while the introduction of CO2 significantly reduces the fluidity of a CABM, it can still meet the requirements of pipeline transportation in backfill mines; (2) the tiny calcium carbonate grains produced during the carbonation reaction can provide additional nucleation sites for the growth and diffusion of hydration products in CABM, and accelerate the hydration heat release rate; (3) the introduction of CO2 into the freshly mixed modified magnesium slag slurry not only helps to improve the compressive strength of the CABM samples at 28 days, but also has a good carbon absorption effect (5.2–7.6%); (4) through XRD, TG-DTG and SEM experiments, it is concluded that the carbonation reaction in the slurry does not prevent the further hydration of the modified magnesium slag, but is helpful for promoting a rapid hydration reaction in a later stage. Therefore, to maintain good fluidity and carbon absorption of the CABM, the backfill slurry should have a water/modified magnesium slag mass ratio of 0.5, a ventilation rate to of 1 L/min, and a ventilation stirring time of 5 min.

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Study on the effect of multi-source solid waste on the performance of its backfill slurry

Cited by 8 publications

References 31 publications

Investigation of Viscoelastic-Plastic Properties of Fresh Cemented Gangue Fly Ash Backfill Slurries

Investigation of Viscoelastic-Plastic Properties of Fresh Cemented Gangue Fly Ash Backfill Slurries

Mix proportion and microscopic characterization of coal-based solid waste backfill material based on response surface methodology and multi-objective decision-making

Experimental study on the production of carbon-absorbing backfill material from freshly mixed modified magnesium slag slurry

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