| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
LEI Shunlin, LI Lixia, FU Kun, LIU Dongjie, PAN Yiming, ZHANG Xingjie. Research of Suitable Material Layer Thickness for Lamination Comminution Based on Numerical Simulation of Real Failure Process Analysis[J]. Conservation and Utilization of Mineral Resources, 2023, 43(3): 120-126. doi: 10.13779/j.cnki.issn1001-0076.2023.03.014
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Research of Suitable Material Layer Thickness for Lamination Comminution Based on Numerical Simulation of Real Failure Process Analysis
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Abstract
HPGR (High pressure grinding rolls) plays an important role in energy-saving and consumption-reduction in metal mines owing to its unique advantages in the lamination crushing principle. Given the differences in mechanical properties, homogeneity and particle size of feed ores, different material layer thickness in a same equipment affects HPGR lamination crushing performance. In this study, taking Anshan-type hematite ores as the research object, suitable particle layer thickness for lamination crushing was characterized based on the macro-mechanical properties and the numerical simulation of real fracture (RFPA) of ores. The tests of compressive strength and tensile strength of standard ore samples were first carried out, and the homogeneity m of ore was characterized by numerical simulation. Then, numerical models of variable layer thicknesses with Φ10 mm spherical hematite particles were configured, and the ballast tests were performed with horizontal constraint simulating the HPGR lamination comminuting process. Finally, an appropriate layer thickness was determined by analyzing the processes of stress transfer and three-dimensional crack penetration failure coupled with the relative energy consumption. It was shown that the fracture mode of configuration with a thickness of 8 layers was diagonal penetration, which was conducive to stress transfer promoting the comminution of particles in the whole bed with a high energy efficiency. Results provided a research basis for determining a suitable layer thickness of HPGR in industry.
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References
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LEI Shunlin, LI Lixia, FU Kun, LIU Dongjie, PAN Yiming, ZHANG Xingjie. Research of Suitable Material Layer Thickness for Lamination Comminution Based on Numerical Simulation of Real Failure Process Analysis[J]. Conservation and Utilization of Mineral Resources, 2023, 43(3): 120-126. doi: 10.13779/j.cnki.issn1001-0076.2023.03.014
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Figure 1.
RFPA software interface diagram
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Figure 2.
The failure analysis flow chart of RFPA numerical model
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Figure 3.
Uniaxial compression sample of hematite ore
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Figure 4.
Brazilian disc splitting test loading and failure diagram
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Figure 5.
Uniaxial compression stress−strain curve of sample
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Figure 6.
Numerical model of different homogeneity m
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Figure 7.
Curve of peak pressure and homogeneity m under uniaxial compression
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Figure 8.
Residual intensity versus strain curve
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Figure 9.
Stress−strain curve of sample and numerical model under uniaxial compression
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Figure 10.
Configuration models with different layers
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Figure 11.
Maximum principal stress and AE of different configuration models
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Figure 12.
Stress−strain curve of different particle layers
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Figure 13.
Cumulative AE energy of different particle layers
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Figure 14.
Specific comminuting energy consumption of different particle layers