Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

Author:

Wang Shi12,Yu Haigen12,Wu Rui12,Tang Mingkun12,Liu Yaohua12,Liu Long12,Song Xuepeng3

Affiliation:

1. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

2. Key Laboratory of Mining Engineering of Jiangxi Province, Jiangxi University of Science and Technology, Ganzhou 341000, China

3. School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Abstract

Coal gangue, the primary solid waste generated during the coal mining process, is typically disposed of on the surface, where it gradually accumulates to form gangue piles that significantly contaminate the surrounding environment. Filling technology has been widely employed for the safe and efficient disposal of coal gangue due to its sustainability, safety, and efficiency. However, there is still a lack of theoretical research on the concentration of gangue slurry in long-distance filling pipeline transportation. Therefore, a calculation model of the ultra-long-distance transportable concentration of coal gangue slurry with different grades was constructed based on the static anti-segregation performance and Bingham model. In addition, the relevant parameters of the calculation model of the ultra-long-distance transportable concentration of coal gangue slurry in this mine were determined using the 8 km pipeline transport of coal gangue slurry in one mine as the technical background. It was subsequently demonstrated that the yield stress, plastic viscosity, and mass concentration of the various grades of gangue slurry in this mine exhibit an increasing exponential function, while the slurry density and mass concentration exhibit an increasing linear function, and the mass concentration and actual flow rate correspond to a quadratic polynomial increment. Finally, the minimum and maximum concentrations for different grades of gangue slurry that can be transported over long distances in this mine were determined. This work provides theoretical and practical guidance on how to select the concentration of gangue slurry for long-distance pipeline transport.

Funder

National Natural Science Foundation of China

Natural Science Foundation of the Jiangxi Province

Qingjiang Young Excellence Support Program Grant of the Jiangxi University of Science and Technology

Publisher

MDPI AG

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