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

Chen, Xin; Shi, Xiuzhi; Zhou, Jian; Chen, Qiusong; Yang, Chao

doi:10.3390/min7040054

Cited by 20 publications

(9 citation statements)

References 33 publications

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“…Standard wall functions are used in the near-wall region. The semi-implicit pressure-linked equation (SIMPLE) algorithm is utilized to solve the coupling of the pressure-velocity fields [31]. Second-order upwind spatial discretization is set for the convective terms, diffusive terms and turbulent viscosity coefficient, to improve the accuracy of calculations [27,32].…”

Section: Computational Methods and Boundary Conditionsmentioning

confidence: 99%

Characterization and Effects of the Shock Losses in a Parallel Fan Station in the Underground Mine

et al. 2017

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Deep underground mines are highly energy consuming due to the need to overcome the growing airflow resistance. The multi-fan station ventilation system (MFSVS), formed by several parallel fans at different locations in an underground mine generally, has greatly reduced energy costs by using high-quantity and low-pressure energy-saving fans. However, experimental data still indicates that 30-70% of the fan pressure is used to overcome the severe shock losses in a parallel fan station (PFS), in spite of more than 80% operating efficiency, and the shock losses greatly weaken the superiority and the service capacity of PFS. Based on the investigation and measured data of several PFSs in a MFSVS in an underground mine, a three-dimensional PFS model was developed by computational fluid dynamics (CFD) to demonstrate airflow performance and variation characteristics of velocity, pressure and turbulence. First, the fan characteristic in the PFS was discussed and compared with the fan operating performance under standard conditions; the shock losses were then presented from both sides of the inlet shock losses and the outlet shock losses in the PFS; meanwhile, the effects of blade angle variation and airflow mutual interference were conducted to determine whether they exert a significant influence on the shock losses. The results show that the shock losses are primarily generated in the range of 0 to 3.0 m from the fans' exits, due to the intensely change in air velocity in the PFS. The study also provides several directions and references for recovering air pressure and reducing energy consumption in the parallel fans' structure.

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Section: Computational Methods and Boundary Conditionsmentioning

confidence: 99%

Characterization and Effects of the Shock Losses in a Parallel Fan Station in the Underground Mine

et al. 2017

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“…The treatment of mine tailings has become a hot topic in mining engineering research in recent years due to the potential environmental hazards as well as recovery value prospects [1,2]. Cemented paste backfill (CPB), a tailing disposal method, innovatively transfers tailings from surface storage to underground and has been widely accepted by numerous mining enterprises globally [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Fiber-reinforced cement-based materials are considered composite materials that meet the superposition principle of composite mechanics [33]. In fiber-reinforced concrete applications, a nonlinear formula related to the influence of fiber parameters was proposed as Equations (1) and (2), and a fiber reinforcement index of λ, consisting of the fiber volume fraction and aspect ratio, was used to quantify the effect of adding fiber [34,35]. In subsequent studies, the evaluation model of the UCS of concrete under the influence of a steel-polypropylene hybrid and steel fiber was developed, and good estimation results were obtained.…”

Section: Introductionmentioning

confidence: 99%

Fiber-Reinforced Cemented Paste Backfill: The Effect of Fiber on Strength Properties and Estimation of Strength Using Nonlinear Models

et al. 2020

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This experimental investigation was conducted to research the properties of polypropylene (PP) fiber-reinforced cemented paste backfill (CPB). The unconfined compressive strength (UCS) of the fiber-reinforced CPB showed a significant improvement with average UCS increase ratios of 141.07%, 57.62% and 63.17% at 3, 7 and 28 days, respectively. The macroscopic failure mode and SEM analysis indicated that fibers prevented the formation of large tensile and shear cracks during the pull-out and pull-off failure modes. A linear fitting function for the UCS at a curing time of 3 days and two polynomial fitting functions for the UCS at curing times of 7 and 28 days were established to characterize the relationship between the UCS of the fiber-reinforced and unreinforced CPB. Moreover, based on composite mechanics, nonlinear models related to the UCS and fiber reinforcement index were obtained. The estimated functions containing the fiber reinforcement index λ, which consists of the fiber content and aspect ratio of fiber, could evaluate the UCS. Furthermore, the fiber reinforcement index λ quantifies the enhancement by the fibers. Both estimation results indicated that the UCS values were estimated accurately at curing times of 3, 7 and 28 days in this study. Additionally, the estimation models could be used to guide the strength design of fiber-reinforced CPB. Besides this, the results showed that fiber-reinforced CPB can be used more widely in mine backfills and meets the requirements of controlled low-strength material (CLSM) for broader applications.

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“…Traditionally, the settling and thickening of tailings rely on gravity settling in the vertical sand silo. A number of advanced technologies are used to increase the extraction rate of minerals by grinding the crushed ore into increasingly fine particles [ 13 ]. More than 80% of tailings particles have size less than 74 μm in some mines.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the flocculating settling of unclassified tailings

et al. 2018

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Unclassified tailings are the main backfilling aggregates in mines and their settling is the first step in the utilization of tailings; thus, it is very important to determine their settling behavior. The aim of this study was to understand the flocculating settling behavior of unclassified tailings with different factors. The combination of property detection, laboratory experiments and industrial tests were used to assess the flocculating settling behavior of unclassified tailings; the orthogonal experimental design and the control variate method were used for an experimental design. The results show that the flocculating settling velocity of unclassified tailings decreases with the increase of slurry concentration and that this settling velocity increases first and then decreases with the increase of flocculant unit consumption. The underflow concentration is positively correlated with the slurry concentration and negatively correlated with the flocculant unit consumption and flocculant concentration. Slower feed velocity could produce higher concentration underflow but lower clarity overflow water. The greater the mud height, the higher the underflow concentration and the suspended solids concentration in the overflow water. The underflow concentration has a maximum at the rake speed of 0.3 r/min, and the rake speed has little effect on the suspended solids concentration in the overflow water. By analyzing the settling velocity, the underflow concentration, the suspended solids concentration in the overflow water and the solid flux, the following parameters of the flocculating settling experiments were determined: the flocculant type is APAM with a molecular weight of 12 million, the flocculant unit consumption is 30 g/t, the slurry concentration is 6 vol.%, the flocculant concentration is 0.1 wt.%, the rake speed is 0.3 r/min, and the feed velocity is 0.4 L/min (its solid flux is 0.523 t/(m2·h)). The industrial tests were carried out based on the laboratory settling data, and the appropriate selection parameters of the industrial tests were estimated.

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

Cited by 20 publications

References 33 publications

Characterization and Effects of the Shock Losses in a Parallel Fan Station in the Underground Mine

Characterization and Effects of the Shock Losses in a Parallel Fan Station in the Underground Mine

Fiber-Reinforced Cemented Paste Backfill: The Effect of Fiber on Strength Properties and Estimation of Strength Using Nonlinear Models

An experimental study on the flocculating settling of unclassified tailings

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