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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (6): 811-818.doi: 10.11872/j.issn.1005-2518.2018.06.811

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Experiment Research on Magnetized Water’s Effect on Friction Loss of Paste Slurry in Pipeline Transport

Zhipeng LAN(),Xinmin WANG*(),Qinli ZHANG,Qiusong CHEN   

  1. 1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
  • Received:2017-06-18 Revised:2017-10-20 Online:2018-12-31 Published:2019-01-24
  • Contact: Xinmin WANG E-mail:lly2011ustb@126.com;wxm1958@126.com

Abstract:

To explore the influence of magnetized water on rheological properties of paste slurry pipeline conveying,an indoor experiment was carried out.On the basis of self-made L-inclined tube test device,the physical simulation test of gravity flow of paste slurry under different magnetizing conditions was carried out by orthogonal experimental design.The experimental results were optimized and screened in the end.The results show that the rheological properties of paste slurry can be effectively improved by magnetized water.Besides,magnetized water can reduce yield stress and plastic viscosity of slurry with suitable magnetization conditions,which can improve the reliability of slurry pipeline transportation at the same time.Furthermore,contrasting with blank group,when the magnetic induction being 200~300 mT,magnetized time being 15~25 min and cycling rate being 0.5~1.5 L/s,the friction loss of paste slurry is the smallest,the yield stress and plastic viscosity are reduced by 8%~20% and 12%~35% respectively.

Key words: magnetized water, paste slurry, friction loss, yield stress, plastic viscosity, L-inclined tube, magnetization condition, orthogonal test

CLC Number: 

  • TD853

Fig.1

Magnetized water preparation system"

Fig.2

L-inclined tube test device"

Fig.3

Particle size distribution curve of total tailings"

Table 1

Chemical composition of tailings(%)"

成分 质量分数 成分 质量分数
Cu 0.23 Al2O3 2.06
Pb 0.036 CaO 10.19
Zn 0.064 SiO2 14.28
S 8.50 MgO 4.62
Fe 32.86

Table 2

Physical properties of test material"

物料名称 密度/(t·m-3 容重/(t·m-3 孔隙率/%
全尾砂 3.07 1.13 60.20
普通硅酸盐水泥 3.10 1.30 58.00

Table 3

Level of test factors"

水平 因素
A B C
1 0.5 5 150
2 1.5 15 250
3 2.5 25 350

Table 4

Experimental scheme of orthogonal design"

组别 A B C 试验方案ABC
1 1 1 1 A 1 B 1 C 1
2 1 2 2 A 1 B 2 C 2
3 1 3 3 A 1 B 3 C 3
4 2 1 2 A 2 B 1 C 2
5 2 2 3 A 2 B 2 C 3
6 2 3 1 A 2 B 3 C 1
7 3 1 3 A 3 B 1 C 3
8 3 2 1 A 3 B 2 C 1
9 3 3 2 A 3 B 3 C 2

Fig.4

Description of experiment procedure"

Table 5

Experimental data of L-inclined tube device"

组别 料浆密度(ρ)/(kg· m - 3 料浆高度/m 时间/s 料浆质量/kg
? H 1 ? H 2 t 1 t 2 M 1 M 2
KB 1952 1.441 1.387 8.9 7.7 3.452 3.680
1 1952 1.346 1.375 6.1 5.6 4.286 4.376
2 1952 1.413 1.393 4.3 4.7 5.420 5.641
3 1952 1.329 1.315 6.8 7.4 5.190 5.372
4 1952 1.364 1.362 4.2 3.8 6.525 5.874
5 1952 1.253 1.337 3.2 2.7 9.981 10.020
6 1952 1.238 1.241 2.8 3.5 7.550 9.510
7 1952 1.385 1.389 4.9 5.2 5.890 6.320
8 1952 1.350 1.353 3.5 4.2 7.020 8.490
9 1952 1.249 1.256 5.1 4.4 8.630 7.630

Table 6

Rheological parameters of paste slurry in different test groups"

组别 循环水流量(Q)/(L·s-1 磁化时间(T)/min 磁感应强度(B)/mT

流速( v 1 )/

(m·s-1

流速( v 2 )/

(m·s-1

屈服应力 ( τ o )/Pa 塑性黏度 ( η ) / ( P a ? s )
KB - - - 0.125 0.101 62.776 0.061
1 0.5 5 150 0.204 0.183 57.351 0.048
2 0.5 15 250 0.313 0.329 54.370 0.041
3 0.5 25 350 0.190 0.199 51.262 0.047
4 1.5 5 250 0.404 0.406 55.931 0.052
5 1.5 15 350 0.969 0.814 52.530 0.035
6 1.5 25 150 0.709 0.704 54.644 0.048
7 2.5 5 350 0.317 0.314 52.552 0.041
8 2.5 15 150 0.528 0.524 59.473 0.058
9 2.5 25 250 0.453 0.442 53.831 0.039

Table 7

Range analysis result of influence factors"

指标 特征项 水平值 A B C
屈服应力( τ o )/Pa 均值 1 54.33 55.28 57.16
2 54.37 55.46 54.71
3 55.29 53.25 52.11
极差 R 0.96 2.21 5.04
塑性黏度( η ) / ( P a ? s ) 均值 1 0.045 0.047 0.051
2 0.045 0.045 0.044
3 0.046 0.045 0.041
极差 R 0.001 0.002 0.010

Fig.5

Effect of test factors on yield stress of slurry"

Fig.6

Effect of test factors on plastic viscosity of slurry"

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