Hydraulic convey of iron ore slurry: Pipeline wear and ore particle degradation in function of pumping time

Calderón-Hernández, José Wilmar; Sinatora, Amilton; Melo, Hercílio Gomes de; Chaves, Arthur Pinto; Mano, Eliana Satiko; Filho, Laurindo de Salles Leal; Paiva, José Luís de; Braga, André Soares; Pinto, T.C. Souza

doi:10.1016/j.wear.2020.203272

Cited by 9 publications

(6 citation statements)

References 56 publications

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“…During the push movement, the solid particles in the slurry will settle. With the increase of the transportation distance, the range of the push layer will continue to stack, which will eventually lead to the change in the slurry concentration in the pipeline (Calderon-Hernandez et al, 2020).…”

Section: Velocity Distribution Law Of the Pipeline Sectionmentioning

confidence: 99%

Research on key parameters of pipeline transportation of waste rock treatment in underground residual space

Zhu

Song

2023

Front. Earth Sci.

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As the key link of coal gangue slurry filling, slurry pipeline transportation is an important guarantee to realize the slurry mixing and safe transportation of gangue from solid powder. To realize the underground excavation gangue of the Huangling No. 2 coal mine without raising the ground, the slurry filling technology is proposed to transport the slurry made by gangue through the pipeline and fill it into the goaf. The phase composition and microstructure characteristics of underground excavation gangue in the Huangling No. 2 coal mine were analyzed by X-ray diffraction and an electron microscope scanning test, the slurry-forming properties of gangue powder with different particle sizes and gradations were studied, and the influence of gangue slurry concentration on its rheological properties was analyzed. The experimental results show that the gangue powder crushed using a cage crusher can be made into stable slurry when the particle grading size is the natural crushing gradation with the upper limit of particle size less than 3 mm. The viscosity of the slurry is positively correlated with the concentration. When the concentration is below 70%, the increase in viscosity is small, and when the concentration is above 70%, the increase in viscosity is significant. It is determined that the concentration of the Huangling No. 2 coal mine slurry is 70%. Based on the determination of slurry preparation parameters, the simulation analysis of slurry pipeline transportation was carried out, the influence of design velocity on the velocity distribution of the pipeline section and the variation law of slurry concentration was explored, and the design velocity of the project is determined to be 1.5 m/s. The engineering practice shows that the slurry preparation parameters are reasonable. The crushing and pulping of gangue under the ground and the safe transportation of a 6 km pipeline are realized, which provides a reference for similar engineering projects.

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Section: Velocity Distribution Law Of the Pipeline Sectionmentioning

confidence: 99%

Research on key parameters of pipeline transportation of waste rock treatment in underground residual space

Zhu

Song

2023

Front. Earth Sci.

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“…Current research on the damage caused by backfill drilling pipelines primarily focuses on pipeline wear [9][10][11][12]. Levy [13] conducted experimental research demonstrating that the shape and size of filler slurry particles have a significant impact on pipeline wear.…”

Section: Introductionmentioning

confidence: 99%

“…The wear condition of the variable diameter pipe fluctuated greatly with changes in pipeline factors when its length was below 80 mm. Current research on the damage caused by backfill drilling pipelines primarily focuses on pipeline wear [9][10][11][12]. Levy [13] conducted experimental research demonstrating that the shape and size of filler slurry particles have a significant impact on pipeline wear.…”

Section: Introductionmentioning

confidence: 99%

New Model and Finite Element Analysis of the Anti-Extrusion Strength of Backfill Drilling Pipelines

Li,

Wang,

Liu

2024

Minerals

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Currently, in some domestic and foreign mines, the backfill drilling pipeline experiences a rupture phenomenon even when the wear degree is low. This results in a delay in production due to the filling becoming ‘sick’. This paper presents, for the first time, the damage mechanism from a mechanical perspective and re-derives the anti-extrusion strength model of the backfill drilling pipeline. We investigate the influence of the law on the anti-extrusion strength of pipelines from the perspective of strata and cement rings. We then verify the theoretical and simulation results through engineering examples. The results demonstrate that the Mises stress criterion is a suitable modification principle for the anti-extrusion strength model of the backfill drilling pipeline. The anti-extrusion strength of the pipeline is related to the elastic modulus and Poisson’s ratio of the stratum, and the thickness of the cement ring. It is negatively affected by the depth of the stratum. For hard strata, a cement ring with a smaller elastic modulus is suitable, while for soft stratum, a cement ring with a larger elastic modulus is recommended. When the missing angle of the cement ring is less than 60°, the stress concentration factor increases up to 2.2. The stress unloading capacity of the cement ring ranges from 32.7% to 37.8%, and optimal performance of the cement ring is achieved when it has high strength and low rigidity. The backfill filling pipeline of a copper mine abroad was destroyed due to external extrusion force exceeding its anti-extrusion strength value. The modified pipeline anti-extrusion strength model is 18.2% higher than the pipeline API strength value. This finding can inform the design of the backfill filling pipeline for China’s kilometer-deep wells in the future.

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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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Hydraulic convey of iron ore slurry: Pipeline wear and ore particle degradation in function of pumping time

Cited by 9 publications

References 56 publications

Research on key parameters of pipeline transportation of waste rock treatment in underground residual space

Research on key parameters of pipeline transportation of waste rock treatment in underground residual space

New Model and Finite Element Analysis of the Anti-Extrusion Strength of Backfill Drilling Pipelines

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

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