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Gold Science and Technology ›› 2020, Vol. 28 ›› Issue (1): 90-96.doi: 10.11872/j.issn.1005-2518.2020.01.028

• Mining Technology and Mine Management • Previous Articles     Next Articles

Optimization and Application for Slurry Transportation in Large Fill-times-line Based on Buckingham Equation

Zongnan LI1,2,3(),Wandong LUO4,Lijie GUO2,3(),Wenyuan XU2,3   

  1. 1.School of Civil and Resources Engineering，University of Science and Technology Beijing, Beijing 100083，China
    2.Beijing General Research Institute of Mining and Metallurgy Technology Group，Beijing 100160，China
    3.National Center for International Joint Research on Green Metal Mining，Beijing 100260，China
    4.Anqing Copper Mine，Tongling Nonferrous Metals Group Co. ，Ltd. ，Anqing 246131，Anhui，China
  • Received:2019-04-01 Revised:2019-09-10 Online:2020-02-29 Published:2020-02-26
  • Contact: Lijie GUO E-mail:lizongnanbgrimm@163.com;ljguo264@126.com

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Abstract:

Miles of pipelines are needed for the slurry transporting form the filling slurry preparation station to the goaf （filling stop） underground.Restricted by the spatial condition of orebody，slurry pipeline is usually connected by several vertical and horizontal sections，once the horizontal distance between the goaf to station is far from each other，the problem which called larger fill-times-line pipe transport（LFTLT） system is made.It is difficult to transport high density filling slurry by a LFTLT，therefore，many mines have to choose a lower density slurry instead therefore causing poor filling quality.So，how to transport high density filling slurry at a low cost is an important subject.Pumping slurry is usually used for LFTLT，such as supplying energy of paste slurry through plunger pump.However，the direct problem of power-transmission is high energy consumption and high cost.For many large-scale metal mines，such as iron ore and copper ore mines，filling materials consume a lot and transportation needs is large.Pumping filling is often high cost，thus restricts its extensive using in the transport process.How to optimize the slurry transport system to make true low cost，high efficiency and safety using is particularly important and also has important practical significance.The flow characteristics of high concentration filling slurry in pipeline can be expressed by Bingham flow pattern mathematically，it’s a linear non-newtonian fluid which means the fluid will flow only when the shear stress exceeds the initial shear stress，and the viscosity coefficient of the fluid is a constant.Because this flow pattern is simple in equation form and convenient in calculation and analysis，a large number of research practices has been done and show that this flow pattern is more in line with the total tailings cemented filling slurry with a concentration of more than 65%.In this flow pattern，scholars have made fruitful achievements in tailing slurry transport，providing beneficial exploration for energy saving and efficiency increasing in this field，also achieved good results.On the basis of predecessors，this study work on optimization of self-flowing pipeline system which be used for tailings slurry concentration beyond 68%，and belongs to the LFTLT system.The main research method is using of the Buckingham equation of Bingham fluid （B-H），combining with the actual situation that low filling density and large fill-times-line in MTS section of Anqing copper mine.Pipeline optimization is also carried out in this paper，after that，the technical reconstruction has been taken，as a result，it is shown that the transportability has been obviously improved，the goal of increasing filling density by 2% has been achieved，which obviously created a comprehensive benefit.

Key words: large fill-times-line, slurry transportation, Bingham fluid, pipe transport resistance, flowing velocity

CLC Number: 

  • TD853

Fig.1

Technical thought on local optimization for pipe line"

Fig.2

Statistical chart of filling technological indicators in Matoushan ore segment"

Fig.3

Drilling layout plane graph of -280 m middle section"

Table 1

Comparison of transport parameters of filling slurry before and after optimization"

项目参数优化前优化后
-280 m中段管道输送参数分析对比至-280 m管道总长度/m2 3991 961
-280 m中段最大倍线7.165.85
计算工作流速（质量分数为66%）/（m·s-1）3.123.97
局部平均输送阻力/（Pa·m-1）2 125.02 599.6
计算局部输送能力/（m3·h-1）90.1114.6
至-460 m中段管道整体输送参数分析对比管道总长度/m2 7712 760
充填倍线5.385.36
计算工作流速（质量分数为66%）/（m·s-1）4.384.40
平均输送阻力/（Pa·m-1）2 828.22 839.5
计算输送能力/（m3·h-1）126.4127.0

Fig.4

Structural diagram of filling pipeline before and after reconstruction of Matoushan ore segment"

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