Wear law of Q345 steel under the abrasion–corrosion synergistic effect of cemented paste backfill

Wang, Xiaolin; Wang, Hongjiang; Wu, Aixiang; Kang, Guowei

doi:10.1016/j.conbuildmat.2022.127283

Cited by 8 publications

(2 citation statements)

References 34 publications

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“…Due to the increase in the vertical depth of the backfilling pipe in deep mining, the stowing gradient decreases, which requires effective solutions to the problems of high pressure and severe wear of the pipe [17][18][19]. Currently, researchers adopt the following methods to reduce the pressure and wear of the slurry on the pipeline [20][21][22][23][24][25][26]: reducing the erosion effect of the filling slurry on the pipeline, using the full pipe flow conveying system in the vertical pipeline, using the depressurization conveying system, decreasing the conveying speed of the slurry, changing the properties of the paste by adding binder content, and using neutral water to prepare the filling slurry and flush the pipeline. However, there are few studies on reducing pressure and pipeline wear from the perspective of pipeline structure design.…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient

Wang

Mei

et al. 2022

Metals

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To solve the high slurry pressure and severe wear at some sections in backfilling pipelines, this study investigates the solution of using an auxiliary pipe to increase the resistance and reduce the pressure of the mine backfilling pipeline. Using computational fluid dynamics, three auxiliary pipe models, a Z-shaped pipe, a S-shaped pipe and a spiral pipe were constructed and the velocity and pressure distribution characteristics of the filling slurry in the auxiliary pipes were analyzed. The function of friction loss in spiral pipes with different pitches and spiral diameters was established, and the amendment equation for calculating the effective stowing gradient was studied when using spiral pipes to increase resistance and reduce pressure. The results show that, compared with the Z-shaped pipe and the S-shaped pipe, the velocity and pressure in the spiral pipe change continuously and steadily, and there is no obvious sudden change in the local velocity and pressure. Therefore, it is difficult to burst the pipe. When the velocity is 2.5 m/s and the vertical height of the pipe is 2.5 m, the friction loss of the filling slurry in the spiral pipe can reach 3.87~21.26 times that in the vertical pipe, indicating that the spiral pipe can effectively play the role of increasing resistance and reducing pressure. The relationship between the friction loss and spiral diameter is a linear function, and the relationship between the friction loss and pitch is a quadratic function. The three are binary quadratic function relationships. The equation for calculating the effective stowing gradient is obtained, which provides a convenient method for engineering applications and industrial design.

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Section: Introductionmentioning

confidence: 99%

The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient

Wang

Mei

et al. 2022

Metals

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“…In recent decades, paste backfill technology has been extensively and increasingly used in mining operations to dispose of large quantities of mineral tailings [1], provide underground mine support and maximize ore recovery [2][3][4][5]. Paste backfill with a solids content of approximately 70 to 85 wt% [6,7], in which full tailings are bonded together by a hydraulic binder and mixing water [8], is prepared at the surface plant and then transported underground by gravity or a pumping system.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Flow Behavior of Paste Slurry Transported by Gravity in Vertical Pipes

Jian-dong

Wang

et al. 2022

Processes

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In order to dispose of large quantities of mineral tailings, paste backfill is proposed and widely adopted. Paste backfill, which has high concentration and yield stress and behaves as a non-Newtonian fluid, is prepared at the surface plant and then transported underground. Vertical pipelines are more likely to suffer various failures, such as pipe breaks, wear and plugging, during the transport process. Few present studies focus on the flow behavior of paste slurry flowing in vertical pipes. In this work, two L-shaped pipeline systems with internal diameters (ID) of 40 mm and 65 mm with electrical resistance tomography (ERT) were manufactured to visualize flow regimes and measure the axial velocity and pipe pressure of slurry flowing in the upper and lower zones of vertical pipes. Flow regimes were extracted from ERT-reconstructed images stacked by time-series. Based on this, four typical flow regimes were summarized, and the characteristics of velocity and pressure change with vertical pipe depth were discussed.

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Multiphase slurry flow regimes and its pipeline transportation of underground backfill in metal mine: Mini review

Wang,

Cheng,

Yin

et al. 2023

Construction and Building Materials

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Wear law of Q345 steel under the abrasion–corrosion synergistic effect of cemented paste backfill

Cited by 8 publications

References 34 publications

The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient

The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient

Experimental Investigation on Flow Behavior of Paste Slurry Transported by Gravity in Vertical Pipes

Multiphase slurry flow regimes and its pipeline transportation of underground backfill in metal mine: Mini review

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