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Pressure and Flowrate Characteristics of Free Fall Backfill System
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Xiaosong LI1, Chengyou ZHAO1, Shuai QIN1, Bolin XIAO2
Mining and Metallurgical Engineering | 2024, 44(3) : 6 - 10
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Mining and Metallurgical Engineering | 2024, 44(3): 6-10
• MINING •
Pressure and Flowrate Characteristics of Free Fall Backfill System
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Xiaosong LI1, Chengyou ZHAO1, Shuai QIN1, Bolin XIAO2
Affiliations
  • 1.NFC Africa Mining Plc, Kitwe 22592, Zambia
  • 2.School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
Published: 2024-06-01 doi: 10.3969/j.issn.0253-6099.2024.03.002
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A free fall backfill (FFB) system with high-concentration slurry in a mine was taken as an example to study pipeline parameters and resistance characteristics of FFB system by conducting theoretical analysis, laboratory test and verification with field measurement. The results show that the FFB system has many working procedures, with flowrate for normal backfilling fluctuating within the range of 100-240 m3/h, and the pressure at 1.2-2.2 MPa. The flowrate at specific points of the pipeline presents a quasi-normal distribution, averaging 190 m3/h. There are two characteristic peaks for the pressure, being 1.86 MPa and 3.04 MPa, respectively. The parameters at a single point of pipeline cannot be used to analyze and judge the working conditions, such as pipe blockage and leakage. The pressure difference and flowrate difference between sections of the pipeline present obvious normal distribution, with mathematical statistics expectations of 4.62 m3/h and 0.64 MPa, respectively. The difference in instantaneous flowrate and pressure can be used to judge blockage and leakage of the pipeline. The flow resistance in the laminar-turbulent transition zone predicted by the Swamee-Aggarwal formula is 2.08 MPa/km, which is consistent with the measured value of 2.15 MPa/km.

deep mine backfill  /  free fall backfill (FFB) system  /  pipeline pressure  /  flow resistance  /  flowrate of slurry  /  pipeline transportation
Xiaosong LI, Chengyou ZHAO, Shuai QIN, Bolin XIAO. Pressure and Flowrate Characteristics of Free Fall Backfill System[J]. Mining and Metallurgical Engineering, 2024 , 44 (3) : 6 -10 . DOI: 10.3969/j.issn.0253-6099.2024.03.002
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Year 2024 volume 44 Issue 3
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Article Info
doi: 10.3969/j.issn.0253-6099.2024.03.002
  • Receive Date：2023-12-22
  • Online Date：2026-03-17
  • Published：2024-06-01
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  • Received：2023-12-22
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    1.NFC Africa Mining Plc, Kitwe 22592, Zambia
    2.School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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