Comparative Experimental Study of Multi−stage Ball Distribution to Improve the Efficiency of Semi−autogenous Grinding

GUO Hongchen; XIAO Qingfei; LI Yunxiao; ZHOU Qiang; LIU Xiangyang

doi:10.13779/j.cnki.issn1001-0076.2023.04.006

2023 Vol. 43, No. 4

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Article navigation > Conservation and Utilization of Mineral Resources > 2023 > 43(4): 60-67

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GUO Hongchen, XIAO Qingfei, LI Yunxiao, ZHOU Qiang, LIU Xiangyang. Comparative Experimental Study of Multi−stage Ball Distribution to Improve the Efficiency of Semi−autogenous Grinding[J]. Conservation and Utilization of Mineral Resources, 2023, 43(4): 60-67. doi: 10.13779/j.cnki.issn1001-0076.2023.04.006

Citation:

GUO Hongchen, XIAO Qingfei, LI Yunxiao, ZHOU Qiang, LIU Xiangyang. Comparative Experimental Study of Multi−stage Ball Distribution to Improve the Efficiency of Semi−autogenous Grinding[J]. Conservation and Utilization of Mineral Resources, 2023, 43(4): 60-67. doi: 10.13779/j.cnki.issn1001-0076.2023.04.006

Comparative Experimental Study of Multi−stage Ball Distribution to Improve the Efficiency of Semi−autogenous Grinding

1.
Kunming University of Science and Technology. State Key Laboratory of Clean Utilization of Complex Nonferrous Metal Resources, Kunming 650093, China
2.
School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093
3.
State Key; Laboratory of Mineral Processing Science and Technology, Beijing 100070, China
4.
State Key Laboratory of Automatic Control Technology of Mining and Metallurgical Processes (Beijing); Beijing 100070, China

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Corresponding author: XIAO Qingfei, 13515877@qq.com

Received Date: 01 June 2023

Publish Date: 25 August 2023

Abstract

Abstract

A single Φ150 mm steel ball media size in a semi−autogenous grinding ball mill in an iron ore plant in Panzhihua, Sichuan does not match the feed size and the mechanical properties of the ore, and the single steel ball size leads to high mill energy consumption and low efficiency.The maximum ball diameter of 150 mm was determined by using Bond Gong ball mill index test and Azzaroni formula, and the recommended steel ball grading of m(Ф150 mm)∶m(Ф120 mm)=1∶2 was verified to be the best by grinding test in a small mill with D×L 450×450 mm. The recommended steel ball gradation was finally confirmed to be the best. In this study, the results of laboratory grinding tests showed that the recommended steel ball grading reduced the stubborn yield by 0.32 percentage points and increased the yield of γ_-0.074 mm by 3.20 percentage points compared with the on-site steel ball grading; the results of discrete element (DEM) simulation experiments showed that the recommended steel ball grading increased the tangential collision energy utilization by 2.98 percentage points and the normal collision energy utilization by 1.90 percentage points compared with the on−site steel ball grading. The results of discrete element (DEM) simulation experiments show that the recommended ball gradation has improved the tangential collision energy utilization by 2.98 percentage points, the normal collision energy utilization by 1.90 percentage points, and the collision energy to the liner plate by 306.9 J. Thus, it is verified that multi−stage ball gradation can improve the energy utilization of semi−autogenous grinding ball mill.
- bond work index /
- multistage ball allocation /
- semi−self−grinding /
- collision energy distribution /
- discrete element /
- tenacious stone

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References

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