Determining the pressure drop of cemented Gobi sand and tailings paste backfill in a pipe flow

Yang, Xiaobing; Xiao, Bolin; Gao, Qian; He, Jianyuan

doi:10.1016/j.conbuildmat.2020.119371

Cited by 32 publications

(9 citation statements)

References 12 publications

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“…According to rheological parameters and the Buckingham formula, the frictional resistance of filling slurry flowing in the pipe can be calculated using Equation 2 (Gopala et al, 2011;Chen et al, 2016;Yang et al, 2020).…”

Section: Rheological Parameters Testmentioning

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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Section: Rheological Parameters Testmentioning

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 total pressure loss of the filling slurry in the pipeline is calculated by Equation ( 6) [42][43][44].…”

Section: Reliability Verification Of the Model And Parametersmentioning

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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“…significantly impact pressure drop (Haixin 2018). Other than that, pressure drop in a specific pipe flow is also considerably affected by the cemented slurry's physical and chemical properties, such as the pipe diameter and the pipeline reticulation geometry (Yang et al, 2020). Beyond that, Easa and Barigon's research have validated the notable effect that particle size distribution has on flow regime (Eesa and Barigou, 2009).…”

Section: Introductionmentioning

confidence: 99%

Multi-criteria comparative analysis of the pressure drop on coal gangue fly-ash slurry at different parts along an L-shaped pipeline

Wang

Jiao

Cheng

et al. 2022

Preprint

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Disposing coal gangue and fly-ash on the surface is a risky method which has tremendous potential catastrophic consequences for the environment, whereas backfill mining is a promising practice turing those hazardous wastes into useful backfill materials. Unfortunately, how to deliver the slurry into avoid efficiently remains underresearched, therefore, to address this gap, in the present paper, in addition to a laboratory rheological test, computational fluid dynamics software Fluent was also employed to simulate the different effects that individual variables have on the pressure evolution at a specific section of the pipeline. Furthermore, the response surface method was implemented to examine how the multiple factors synergistically affect the pressure drop and their corresponding influencing weights. This paper shows that slurry concentration, speed, and pipe diameter all significantly affect the pressure drop of slurry and that conveying speed is the dominant factor in the bend section. In contrast, pipe diameter becomes the dominant factor in the horizontal and vertical pipe sections.

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Determining the pressure drop of cemented Gobi sand and tailings paste backfill in a pipe flow

Cited by 32 publications

References 12 publications

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

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

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

Multi-criteria comparative analysis of the pressure drop on coal gangue fly-ash slurry at different parts along an L-shaped pipeline

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