Optimization of Steel Ball Size and Discrete Element Simulation Analysis of a Semi-autogenous Grinding Gold Mine in Yunnan

XIE Haosong; XIAO Qingfei; ZHANG Zhipeng; REN Yingdong

doi:10.13779/j.cnki.issn1001-0076.2023.01.006

2023 Vol. 43, No. 1

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Article navigation > Conservation and Utilization of Mineral Resources > 2023 > 43(1): 57-65

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XIE Haosong, XIAO Qingfei, ZHANG Zhipeng, REN Yingdong. Optimization of Steel Ball Size and Discrete Element Simulation Analysis of a Semi-autogenous Grinding Gold Mine in Yunnan[J]. Conservation and Utilization of Mineral Resources, 2023, 43(1): 57-65. doi: 10.13779/j.cnki.issn1001-0076.2023.01.006

Citation:

XIE Haosong, XIAO Qingfei, ZHANG Zhipeng, REN Yingdong. Optimization of Steel Ball Size and Discrete Element Simulation Analysis of a Semi-autogenous Grinding Gold Mine in Yunnan[J]. Conservation and Utilization of Mineral Resources, 2023, 43(1): 57-65. doi: 10.13779/j.cnki.issn1001-0076.2023.01.006

Optimization of Steel Ball Size and Discrete Element Simulation Analysis of a Semi-autogenous Grinding Gold Mine in Yunnan

1.
School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
State Key Laboratory of Clean Utilization of Complex Nonferrous Metal Resources, Ministry of Provincial Affairs, Kunming 650093, Yunnan, China

More Information

Corresponding author: XIAO Qingfei, 13515877@qq.com

Received Date: 27 October 2022

Publish Date: 15 February 2023

Abstract

Abstract

To address the problem of the serious accumulation of hard rock (-80+25 mm) in semi-autogenous grinding mill of a gold mine in Yunnan, The theoretical optimum size of steel ball was calculated by Duan's semi-theoretical formula of ball diameter which was based on the determination of mechanical properties and particle size of ore feed. The grinding cycle test was carried out with the steel ball size as a single variable, and grinding effect was verified by discrete element simulation analysis. The results showed that the average platts hardness of the ore is relatively large, which is medium to hard, and there are relatively large brittleness and toughness at the same time. The recommended Φ140 mm scheme had the lowest tendency to accumulate hard rock during the grinding cycle test. After 4 cycles, the hard rock yield was the lowest at 3.89%, 3.50 percentage points lower than the on-site Φ120 mm scheme, while the −2 mm pass grade and −0.074 mm grade yield were the highest, 8.40 and 3.15 percentage points higher than the on-site Φ120 mm scheme respectively. The recommended Φ140mm scheme was more active than the on-site Φ120 mm scheme in terms of hard rock particle motion, more reasonable collision energy distribution, and higher energy consumption and frequency of high-energy collision for single collision of hard rock by the media. The effectiveness of the recommended Φ140 mm scheme for semi-autogenous grinding to reduce hard rock accumulation was verified from grinding tests and discrete element simulation tests.
- gold ore /
- grinding /
- semi-autogenous grinding /
- hard rock accumulation /
- steel ball size /
- discrete element method

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References

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