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Gold Science and Technology ›› 2023, Vol. 31 ›› Issue (2): 323-330.doi: 10.11872/j.issn.1005-2518.2023.02.096

• Mining Technology and Mine Management • Previous Articles     Next Articles

Experiment and Simulation Study on Crushing Characteristics of Ore Under Quasi-static Loading in a Mine

Shuhao HAO1(),Gaipin CAI1,2(),Cheng YU1,Huiming CHEN1   

  1. 1.School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
    2.Jiangxi Province Engineering Research Center for Mechanical and Electrical of Mining and Metallurgy, Ganzhou 341000, Jiangxi, China
  • Received:2022-07-28 Revised:2022-12-22 Online:2023-04-30 Published:2023-04-27
  • Contact: Gaipin CAI E-mail:2416308183@qq.com;664431653@qq.com

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Abstract:

In order to study the crushing characteristics of ore （siliceous rock） in a mine under quasi-static loading，a crushing model of ore particle group was established by using Tavares crushing model on the basis of cylinder loading test，and the crushing characteristics of cylinder loading test and crushing simulation analysis were compared and analyzed.The results show that：（1） The breakage of ore particle group can be divided into three stages.In the tight stage，the void fraction of ore group is decreasing，and the breakage process of ore particle group basically does not occur.In the crushing stage，the void fraction further decreases，the stress on the contact points between ore increases，and some ore begin to break.In the agglomerating stage，the stress of ore particle group will increase rapidly，a large number of fine powder particles will be produced，and the agglomeration phenomenon will occur.（2） When the maximum loading pressure is 400 kN，with the decrease of the feeding particle size of ore with narrow particle size （2 mm range），the higher the proportion of small particles after crushing，the proportion of crushed ore of -6 mm under different particle sizes of -18+16 mm，-16+14 mm and -14+12 mm is 25.63%，29.45% and 33.46%，respectively.（3） The effectiveness of the Tavares model is verified by the comparison between simulation and experiment，and the simulation parameters of ore in a mine are calibrated，which provides a new method for the simulation of ore particle crushing，and the research results provide a new idea for the subsequent design of crusher.

Key words: ore particle group, press cylinder test, crushing characteristics, Tavares model, quasi-static loading, crushing model

CLC Number: 

  • TD912

Fig.1

Crushing process of Tavares model"

Fig.2

Quasi-static loading test device for ore in a mine"

Fig.3

Schematic diagram of loading cylinder"

Fig.4

Displacement-force curves of quasi-static loading test of ore in a mine"

Fig.5

Particle size distribution of ore after quasi-static loading test in a mine"

Table 1

Material intrinsic parameters"

材料密度/（kg·m-3）剪切模量/（×1010 Pa）泊松比
某矿石2 8302.50.25
加载压筒7 8007.90.30

Table 2

Contact mechanical parameters"

接触参数矿石—矿石加载压筒—矿石
弹性恢复系数0.200.25
静摩擦系数0.450.65
滚动摩擦系数0.300.50

Table 3

Experimental results of double pendulum impact crushing"

试验编号碎后筛分质量/g总质量/g
-18+14 mm-14+10 mm-10 mm
122.43.82.328.5
225.203.128.3
323.63.61.228.4
414.57.66.428.5
521.53.92.728.1

Table 4

Tavares model setting parameters"

参数名称数值
损伤系数3.0000
颗粒粒径的中位数8.0000
破碎能的拟合函数0.8400
破碎能分布函数的标准差0.4000
alpha_percentage49.6000
b0.0250
允许的最小破碎颗粒粒径/mm1.0000
纳入统计的最小破碎能量/J0.0001

Fig.6

Simulation process of crushing test of press cylinder"

Fig.7

Quasi-static loading simulation of particle size distribution of ore in a mine after crushing"

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