基于满管输送的充填管路优化研究

doi:10.11872/j.issn.1005-2518.2024.01.122

Abstract

Abstract:

Mine filling technology is an important technical means for the construction of green mines，and full pipe transportation is a very important technology in the filling operation of underground metal mines.Full pipe transportation can minimize the contact area between filling slurry and air，reduce the impact on the filling pipeline，extend the service life of the filling pipeline，and improve the efficiency of mining filling operations.Aiming at the problem of the long distance between the newly discovered edge ore body and the filling station in Fankou lead-zinc mine and the high difficulty of transportation，the surface pipeline SL1 and underground pipeline L2-2 in the mine design plan were selected as the research objects to study the optimization plan of the filling pipeline in Fankou lead-zinc mine.Firstly，using theoretical formulas and based on the filling data of Fankou lead-zinc mine，the filling line and full pipe rate of SL1 pipeline and L2-2 pipeline were calculated when transporting graded tailings and fine tailings，respectively.The comparison was made using the optimal full pipe rate of 0.8 as the standard.The results show that both pipelines are in a state of under pipe when transporting graded tailings，and are in a state of over pipe when transporting fine tailings，which do not meet the optimal full pipe rate and need optimization.Secondly，through formula derivation and calculation，the ideal horizontal pipe diameter and the hydraulic slope after diameter change when transporting different slurry were obtained.Finally，numerical simulation was used to verify the calculation results of pipe diameter optimization.A pipeline model was constructed using CFD.The vertical pipeline was taken as 5 m，the horizontal pipeline was 23 m，the total length of the pipeline was 28 m，and the curvature radius at the bend of the pipeline was 0.55 m.The horizontal pipe diameter was changed.Fluent software was used to simulate the full pipe transportation before and after the diameter change，and key data such as flow velocity and full process resistance were obtained when transporting graded tailings and fine tailings.By comparing and analyzing the pressure of the pipeline and the maximum outlet flow rate，it is concluded that SL1 and L2-2 can transport graded tailings by gravity after optimizing the pipe diameter，while fine tailings can’t be transported by gravity.However，the pumping pressure is significantly reduced，so the calculation results are reasonable.Therefore，this optimization plan is relatively reasonable and has strong guiding significance for mining filling operations.

Key words: mine filling, full pipe transportation, pipeline optimization, numerical simulation, pipe diameter change, Fluent software

CLC Number:

TD853

Zefeng XU, Xiuzhi SHI, Rendong HUANG, Wenzhi DING, Xin CHEN. Study on Filling Pipeline Optimization Based on Full Pipe Transportation[J].Gold Science and Technology, 2024, 32(1): 160-169.

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充填料浆	有效粒径/μm	灰砂比	料浆质量浓度/%	屈服剪切应力τ₀/Pa	黏性系数η/（Pa·S）	料浆容重/（t·m^-3）	料浆塌落度ΔH_s/cm
分级尾砂	250	1∶5	76	16.18	0.10	1.97	29.1
细尾砂	7	1∶3	66	29.09	0.24	1.69	27.8

充填管路	充填料浆	原水力坡度i₁（mH₂O/m）	变径水力坡度i₂（mH₂O/m）	理想管径/mm	变径后流速/（m·s^-1）
SL1	分级尾砂	0.20	0.25	87.00	4.68
SL1	细尾砂	0.43	0.21	155.00	1.47
L2-2	分级尾砂	0.20	0.22	94.00	4.00
L2-2	细尾砂	0.43	0.19	168.00	1.25

充填管路	管径/mm	充填料浆	全程阻力/MPa	自然压头/MPa	出口最大流速/（m·s^-1）	出口平均流速/（m·s^-1）
SL1	100	分级尾砂	0.014	0.096	3.796	3.234
	垂直管径100 水平管径87	分级尾砂	0.019	0.096	4.359	3.717
	100	细尾砂	0.104	0.083	3.812	3.236
	垂直管径100 水平管径155	细尾砂	0.097	0.083	2.413	2.086

充填管路	管径/mm	充填料浆	全程阻力/MPa	自然压头/MPa	出口最大流速/（m·s^-1）	出口平均流速/（m·s^-1）
L2-2	100	分级尾砂	0.016	0.096	3.793	3.233
	垂直管100；水平管94	分级尾砂	0.018	0.096	4.031	3.440
	100	细尾砂	0.106	0.083	3.824	3.236
	垂直管100；水平管168	细尾砂	0.097	0.083	2.229	1.925

Study on Filling Pipeline Optimization Based on Full Pipe Transportation

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